CNC LATHE MACHINE INFORMATION
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07-20-2012, 09:13 AM #1
Plastic
- Join Date
- Dec 2011
- Location
- Georgia, USA
- Posts
- 4
Bench Top CNC Lathe Opinions
My company is new to turning and is trying to get a few bench top CNC lathes to do some small ceramic piece turning with. So my question is this: anybody got any manufacturers they have particularly liked? Particularly hated? Why? Any general advice?
For further background, in our attempts to be economical we now have a MircoKinetics lathe that we have not been very satisfied with. I have read/heard to avoid lathes assembled from Chinese parts, which are typically of lower quality, but obviously more competitively priced. Currently looking into Optimum and MDA precision, but would like some experienced input and more choices. Any opinion on Mach3 control software? Thanks tons for any advice. -
07-20-2012, 03:06 PM #2
Cast Iron
- Join Date
- Oct 2010
- Location
- Dewees Texas
- Posts
- 270
We are using Omini Turns on a Tsugami Chucker and one on a Hardinge AHC. Between the 2 machines they have run about 30 years trouble free.
Programing is relatively easy (Different from real CNCs)
#1 Does not have a tail stock.
#2 Fairly compact but not really portable if you need to carry them up stairs
#3 Good precision
Dyna Mectronics made mills that could be considered bench top, I do not know if they still make lathes and if they or any good or would be bench top -
07-22-2012, 03:44 PM #3
- Join Date
- May 2012
- Location
- Helsinki, Finland
- Posts
- 14
Mach3 is very intuitive and easy to use. However, it kept losing zero at random intervals on a mini-mill I used. I don't know if it was a quirk in the machine or the software.
Also, if your Mach3 never seems to get G2 and G3 right... try putting a G91.1 at the beginning of every program you write. It has something to do with how the control fetches the zero point for a circle. Use G90 and G91 normally in addition. -
07-22-2012, 04:38 PM #4
- Join Date
- Apr 2010
- Location
- Wales
- Posts
- 13
Hi everyone, i have converted many Denford and Boxford desktop mills and lathes to Mach3, they're not production machines but on small runs they cope well.
I've never had any problems with zeros or G2 G3 moves with mach, but some people have had problems with control issues on the computer from other software installed. I always set my computers up with XP and Mach3 and nothing else.
You may find find them a bit thin on the ground in the USA. -
07-22-2012, 05:24 PM #5
- Join Date
- Sep 2002
- Location
- Lawrenceville GA USA
- Posts
- 3,593
For your application I believe you will find the Omni Turn machines desirable as they are easy to repair and ceramic dust tends to damage machine parts over time. There are several shops locally running them and they have a pretty good reputation. They are not benchtop machines but they are small and accurate and pretty cost effective.
I can understand if you are not happy with the MicroKenetics machines, they have always been tough to work with.
Charles -
07-23-2012, 04:47 AM #6
- Join Date
- Oct 2006
- Location
- Boston,Mass.
- Posts
- 1,634
Tormach will be releasing a new lathe in 6-12 month...prototypes are made and testing is being done...
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07-23-2012, 05:12 AM #7
- Join Date
- Feb 2004
- Location
- Staten Island NewYork USA
- Posts
- 1,744
I looked very seriously at the Omniturns...I never heard a bad thing about them...for what they are. Good, robust, accurate machines but somewhat limited for certain production and fell short where I needed...so went with a larger CNC that was more versatile.
Small lathe...you may want to look at the Haas Office lathe. I have a few customers that love theirs...I looked into one very quickly, just not enough machine for my application..but given the right circumstances it could have been a real asset for very little space. -
07-23-2012, 11:35 AM #8
- Join Date
- Apr 2010
- Location
- Tropical Milwaukee, WI
- Posts
- 916
Seriously a shame that they don't come with turrets. Only gang. Kills it for me. I'm in the same boat. Missed a Dyna 3500 two weeks ago, by a day. Would likely have been perfect. The hunt continues...Originally Posted by SIM
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07-24-2012, 07:08 AM #9
- Join Date
- Sep 2006
- Location
- Atlanta, GA
- Posts
- 1,214
Why the big need for a turret? I have a Mazak QT-8 and a Hardinge DV 59 with a CNC gang tool attachment and for small parts 1" and less the Hardinge will run circles around the Mazak in regard to cycle time. Its just a matter of marring up the right parts to the right machine.
There are used Omni turns and Hardinges that pop up on EBay from time to time ~10k or less for some pretty decent machines. If I had it to do over again I would go with the Omni control over a Fagor control any day. -
07-24-2012, 08:49 AM #10
- Join Date
- Apr 2010
- Location
- Tropical Milwaukee, WI
- Posts
- 916
Simple really. For me, it's more about your last sentence. The types of parts we do are better suited to a turret than a gang.
And cycle times don't really mean squat for us because it's all prototyping. I'll likely never make another widget like the widget I just made. -
07-24-2012, 10:28 AM #11
- Join Date
- Feb 2009
- Location
- Merrimac, Massachusetts
- Posts
- 504
Haas sold the gt-20 with a turret like this one:
1 Haas HAAS CNC CONTROL, Max. 4000 rpm, Haas GT20, , CNC LATHES - Machine Tools - Second hand machinery - Wotol.com
My old shop teacher just got one in for the shop, he seems to like it. Its a nice sized smaller lathe.
Jason,
Reply With Quote
Not to be confused with Turing.
This article is about the machining operation. For the generic use of the word, see rotating.
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This article needs additional citations for verification. (January 2010) |
Turning can be done manually, in a traditional form of lathe, which frequently requires continuous supervision by the operator, or by using an automated lathe which does not. Today the most common type of such automation is computer numerical control, better known as CNC. (CNC is also commonly used with many other types of machining besides turning.)
When turning, a piece of relatively rigid material (such as wood, metal, plastic, or stone) is rotated and a cutting tool is traversed along 1, 2, or 3 axes of motion to produce precise diameters and depths. Turning can be either on the outside of the cylinder or on the inside (also known as boring) to produce tubular components to various geometries. Although now quite rare, early lathes could even be used to produce complex geometric figures, even the platonic solids; although since the advent of CNC it has become unusual to use non-computerized toolpath control for this purpose.
The turning processes are typically carried out on a lathe, considered to be the oldest machine tools, and can be of four different types such as straight turning, taper turning, profiling or external grooving. Those types of turning processes can produce various shapes of materials such as straight, conical, curved, or grooved workpiece. In general, turning uses simple single-point cutting tools. Each group of workpiece materials has an optimum set of tools angles which have been developed through the years.
The bits of waste metal from turning operations are known as chips (North America), or swarf (Britain). In some areas they may be known as turnings.
Contents |
Turning operations
Turning specific operations include:- Turning
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- Tapered turning
- a) from the compound slide b) from taper turning attachment c) using a hydraulic copy attachment d) using a C.N.C. lathe e) using a form tool f) by the offsetting of the tailstock - this method more suited for shallow tapers.[2]
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- Spherical generation
- The proper expression for making or turning a shape is to generate as in to generate a form around a fixed axis of revolution. a) using hydraulic copy attachment b) C.N.C. (computerised numerically controlled) lathe c) using a form tool (a rough and ready method) d) using bed jig (need drawing to explain).[2]
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- Hard turning
- Hard turning is a turning done on materials with a Rockwell C hardness greater than 45. It is typically performed after the workpiece is heat treated.[3]
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- The process is intended to replace or limit traditional grinding operations. Hard turning, when applied for purely stock removal purposes, competes favorably with rough grinding. However, when it is applied for finishing where form and dimension are critical, grinding is superior. Grinding produces higher dimensional accuracy of roundness and cylindricity. In addition, polished surface finishes of Rz=0.3-0.8z cannot be achieved with hard turning alone. Hard turning is appropriate for parts requiring roundness accuracy of 0.5-12 micrometres, and/or surface roughness of Rz 0.8–7.0 micrometres. It is used for gears, injection pump components, hydraulic components, among other applications.[3]
- Facing
- is part of the turning process. It involves moving the cutting tool at right angles to the axis of rotation of the rotating workpiece.[1] This can be performed by the operation of the cross-slide, if one is fitted, as distinct from the longitudinal feed (turning). It is frequently the first operation performed in the production of the workpiece, and often the last- hence the phrase "ending up".
- Parting
This process is used to create deep grooves which will remove a completed or part-complete component from its parent stock.- Grooving
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is like parting, except that grooves are cut to a specific depth by a form tool instead of severing a completed/part-complete component from the stock. Grooving can be performed on internal and external surfaces, as well as on the face of the part (face grooving or trepanning). |
- Boring
- Enlarging or smoothing an existing hole created by drilling, moulding etc.i.e. the machining of internal cylindrical forms (generating) a) by mounting workpiece to the spindle via a chuck or faceplate b) by mounting workpiece onto the cross slide and placing cutting tool into the chuck. This work is suitable for castings that are to awkward to mount in the face plate. On long bed lathes large workpiece can be bolted to a fixture on the bed and a shaft passed between two lugs on the workpiece and these lugs can be bored out to size. A limited application but one that is available to the skilled turner/machinist.[2]
- Drilling
- is used to remove material from the inside of a workpiece. This process utilizes standard drill bits held stationary in the tail stock or tool turret of the lathe.
- Knurling
- The cutting of a serrated pattern onto the surface of a part to use as a hand grip using a special purpose knurling tool.[2]
- Threading
- Both standard and non-standard screw threads can be turned on a lathe using an appropriate cutting tool. (Usually having a 60, or 55° nose angle) Either externally, or within a bore.[4] Generally referred to as single-point threading.
- tapping of threaded nuts and holes a) using hand taps and tailstock centre b)using a tapping device with a slipping clutch to reduce risk of breakage of the tap.[2]
- threading operations include a)all types of external and internal thread forms using a single point tool also taper threads, double start threads, multi start threads, worms as used in worm wheel reduction boxes, leadscrew with single or multistart threads. b) by the use of threading boxes fitted with 4 form tools, up to 2" diameter threads but it is possible to find larger boxes than this.[2]
Lathes
Main article: Lathe
A lathe is a machine tool used principally for shaping pieces of
metal, wood, or other materials by causing the workpiece to be held and
rotated by the lathe while a tool bit is advanced into the work causing
the cutting action. Lathes can be divided into three types for easy
identification: engine lathe, turret lathe, and special purpose lathes.
Some smaller ones are bench mounted and semi-portable. The larger
lathes are floor mounted and may require special transportation if they
must be moved. Field and maintenance shops generally use a lathe that
can be adapted to many operations and that is not too large to be moved
from one work site to another. The engine lathe is ideally suited for
this purpose. A trained operator can accomplish more machining jobs with
the engine lathe than with any other machine tool. Turret lathes and
special purpose lathes are usually used in production or job shops for mass production or specialized parts, while basic engine lathes are usually used for any type of lathe work.Workholding methods
- Chuck: Chucks are a very common workholding method. There are many types, some for round and square stock, and other for irregular shapes.
- Collet: Primarily used for small round workpieces.
- Faceplate: A faceplate, drive dog, and mandrel may be used to turn workpieces such as gear blanks.
- Drive center: Use hydraulic or spring-loaded teeth that "bite" into the end of workpieces and can be used when the entire length of the workpiece must be machined.
Tooling
Main article: Tool bit
The various angles, shapes, and sizes of a single-point cutting tool have direct relation to the resulting surface of a workpiece in machining operations. Different types of angle such as rake angle, side rake angle, cutting-edge angle, relief angle, nose radius exist and may be different with respect to the workpiece. Also, there are many shapes of single-point cutting tools, such as V-shaped and Square. Usually, a special toolholder is used to hold the cutting tool firmly during operation.Dynamics of turning
Forces
The relative forces in a turning operation are important in the design of machine tools. The machine tool and its components must be able to withstand these forces without causing significant deflections, vibrations, or chatter during the operation. There are three principal forces during a turning process:- The cutting or tangential force acts downward on the tool tip allowing deflection of the workpiece upward. It supplies the energy required for the cutting operation.
- The axial or feed force acts in the longitudinal direction. It is also called the feed force because it is in the feed direction of the tool. This force tends to push the tool away from the chuck.
- The radial or thrust force acts in the radial direction and tends to push the tool away from the workpiece.
Speeds and feeds
Speeds and feeds for turning are chosen based on cutter material, workpiece material, setup rigidity, machine tool rigidity and spindle power, coolant choice, and other factors.See also
References
- ^ a b Todd, Robert H.; Allen, Dell K.; Al ting, Leo (1994), Manufacturing Processes Reference Guide, p. 153, ISBN 0-8311-3049-0.
- ^ a b c d e f g Workshop Technology by W.A.J. Chapman Ph.D. M.Sc.(Eng.), M.I.Mech.E., M.I.Prod.E. Principal Hatfield College of Technology, Hertfordshire first published 1951 part one, two and three published by Edward Arnold (publishers Limited
- ^ a b Koepfer, Chris, "Hard Turning as an Alternative to Grinding", Production Machining, 1/22/2010. productionmachining.com, accessed 3/4/2010
- ^ "Threading On A Lathe : Modern Machine Shop". Mmsonline.com. 2003-01-15. Retrieved 2012-03-13.
External links
- "Lathe Introduction". Archived from the original on 2010-01-08. Retrieved 2010-01-08.
- Schneider, George. "Turning Tools and Operations." American Machinist, January, 2010.
Machine
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Honge Precision Industies Corp. : CNC Drilling Machine
( Origin : Taiwan Manufacturers & Suppliers )
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( Origin : Taiwan Manufacturer & Supplier )
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( Origin : Taiwan Manufacturer & Supplier )
Ocean Technologies Co.,Ltd., was established in 2000. Our company is a professional manufacturer of metal cutting machinery, EDM Drilling Machines, broaching and tapping Machine, Drilling
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( Origin : Taiwan Manufacturer & Supplier )
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( Origin : Taiwan Manufacturers & Suppliers )
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( Origin : Taiwan & Mainland China Manufacturer & Supplier )
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( Origin : Taiwan Manufacturers & Suppliers )
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( Origin : Taiwan Manufacturer & Supplier )
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( Origin : Taiwan & Mainland China Manufacturers & Suppliers )
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( Origin : Taiwan Manufacturer & Supplier )
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( Origin : Taiwan Manufacturers & Suppliers )
Jih-I Machinery Co., Ltd. established in 1971, specialized in
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( Origin : Mainland China Manufacturer & Supplier ) 
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12. Hanhsin Precision Industrial Co., Ltd. : CNC Drilling Machine
( Origin : Taiwan Manufacturers & Suppliers )
Taiwan CNC Drilling Machine
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13. Buildwell Industrial Co., Ltd. : CNC Drilling Machines
( Origin : Taiwan Manufacturer & Supplier )
Buildwell Industrial Co., Ltd. was established in 1987 and specializes in manufacturing high precision drill chucks, CNC Drilling Machine, N.C. tooling for Machine centers as well as accessories for milling Machine, and grinding machines. We are one of the leading manufacturers and exporters in Taiwan supplying CNC Drilling Machine. In order to cope with ever-increasing demand in CNC Drilling Machine,
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14. Michaellin Tools Mfg. Co., Ltd. : CNC Drilling Machine
( Origin : Taiwan Manufacturers & Suppliers )
Michaellin Tools Mfg. Co., Ltd. was established to develop and manufacture CNC Drilling Machine.
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15. 7-Leaders Corp. : CNC Drilling Machines
( Origin : Taiwan Manufacturer & Supplier )
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16. Topist Enterprise Co., Ltd. : CNC Drilling Machine
( Origin : Taiwan Manufacturers & Suppliers )
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saying to create the most value for the whole society.* Company Link * Company Profile * View All Items
17. JARNG YEONG ENTERPRISE CO., LTD. : CNC Drilling Machines
( Origin : Taiwan Manufacturer & Supplier )
JARNG YEONG is a specialized high-precision automatic lathe and CNC Drilling Machine
machinery manufacturer, supplier and exporter since 1978. We
consistency and constantly updated state-of-the-art technology and
facility to fulfill customers’ CNC Drilling Machine
needs. In 1990, we developed our first automatic lathe and received
positive responses from customers. We took out the CE certification of
automatic lathe and CNC lathe, exported to EU countries in
2004. In order to meet the dynamic industry needs, we have expanded our
factory to 7000㎡, and established the turning & milling combined Machine
R&D Center. Today we can provide over 500 lathe machines per year.
We have a good reputation and positive responses from the market. If you
need further information about our CNC Drilling Machine...* Company Link * Company Profile * View All Items
18. Victor Taichung Machinery Works Co., Ltd. : CNC Drilling Machine
( Origin : Taiwan & Mainland China Manufacturers & Suppliers )
Founded in 1954, Victor Taichung Machinery Works Co., Ltd.
started with making conventional lathes in Taiwan and now steadily
supplies CNC machining centers and CNC Drilling Machine
by devoting our management to non-stop R&D and innovations. All
products are marketed globally under the brand names VICTOR or FORTUNE
which highlight our strong position as the leading manufacturer in
Taiwan. Insisting on "Technology Innovations and Quality Superiority",
we're continuously devoted to developing new generation of CNC Drilling Machine.
To ensure marketing for our products, we've invested considerably in
setting up a global distribution network. To strive for perpetual
development and technological innovations, we will keep on manufacturing
modern CNC Drilling Machine with greater value added and...* Company Link * Company Profile * Company Video * View All Items
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Both
DCT0020 and DCT0040 are utilized in building in the following
CNC Drilling and Carving machines.
A
complete CNC solution is also developed in this project. Significantly,
both linear and arc interpolation functions are integrated with DSP to
enhance computational capability.
 |
Wholesale Suppliers & Factory Price Contact Global Exporters Directly! · www.Alibaba.com
| Computer Numerical Control (CNC) Drilling |
 |
| Computer Numerical Control (CNC) Drilling is commonly implemented
for mass production. The drilling machine, however, is often a
multi-function machining center that also mills and sometimes turns.
The largest time sink for CNC drilling is with tool changes, so for
speed, variation of hole diameters should be minimized. The fastest
machines for drilling varying hole sizes have multiple spindles in
turrets with drills of varying diameters already mounted for drilling.
The appropriate drill is brought into position through movement of the
turret, so that bits do not need to be removed and replaced. A
turret-type CNC drilling machine is shown below. A variety of semi-automated drilling machines are also used. An example is a simple drill press which, on command, drills a hole of a set depth into a part set up beneath it. In order to be cost-effective, the appropriate type of CNC drilling machine needs to be applied to a particular part geometry. For low-volume jobs, manual or semi-automated drilling may suffice. For hole patterns with large differences in sizes and high volume, a geared head is most appropriate. If holes are close to each other and high throughput is desired, a gearless head can locate spindles close together so that the hole pattern can be completed in one pass. For further reference for CNC processes, please refer to the CNC, metal forming section. 
|
The Haas DT-1 is a compact, high-speed drill and tap machine with full milling capabilities. The machine has a 20" x 16" x 15.5" (xyz) work cube and a 26" x 15" T-slot table. A powerful BT30 taper inline direct-drive spindle provides 12,000 rpm, and allows rigid tapping at speeds to 5000 rpm. A high-speed, 20-pocket tool changer swaps tools quickly, while 2400 ipm rapids and high accelerations combine to shorten cycle times and reduce non-cutting time.
DT-1
Production Machinery Co Inc, Rockford, IL 815-962-0937 (Fax 815-962-0953) Steve Hall
R M S Industries, Inc, Cincinnati, OH 800-485-1125 (Fax 513-232-4900) Rudy Skoff
TNT Industrial, Huntington Beach, CA 714-612-1480 (Fax 714-242-1565) Jim Thinnsen
Machinery Management LLC, South Elgin, IL 847-608-9300 (Fax 847-608-9301) Tom Hazelhurst
S & M Machinery Sales Inc, Warren, MI 586-755-1234 (Fax 586-755-9876) Spencer Minns
Raco Industrial Corp, Des Plaines, IL 847-298-8600 (Fax 847-635-8976) Jack Boecher
Used Solutions Inc, McHenry, IL 815-759-5000 (Fax 815-759-5004) Mark Mammen
S & M Machinery Sales Inc, Warren, MI 586-755-1234 (Fax 586-755-9876) Spencer Minns
Machinery Resources Intl, Simi Valley, CA 818-346-7985 (Fax 818-346-7986) Sales Dept.
Investment Recovery Services, Fort Worth, TX 817-222-9848 (Fax 817-834-4075) Mike Frost
McKean Machinery Sales Inc, Brook Park, OH 216-761-7011 (Fax 216-761-7144) John Brand
Used Solutions Inc, McHenry, IL 815-759-5000 (Fax 815-759-5004) Mark Mammen
McKean Machinery Sales Inc, Brook Park, OH 216-761-7011 (Fax 216-761-7144) John Brand
McKean Machinery Sales Inc, Brook Park, OH 216-761-7011 (Fax 216-761-7144) John Brand
Cities Advanced Machinery, Eden Prairie, MN 952-944-6060 (Fax 952-944-0043) Harry Youtsos
Used Solutions Inc, McHenry, IL 815-759-5000 (Fax 815-759-5004) Mark Mammen
Ditter Industries Inc, Lake Villa, IL 847-265-1075 (Fax 847-265-1078) Jerry Ditter
Kaste Industrial Machine Sale, Enfield, CT 860-623-5700 (Fax 860-654-0548) Brad
Automatics & Machinery Co Inc, Longmont, CO 800-543-7666 (Fax 303-651-6556) Steve Beck
Cap Machinery Corp, Auburn, MA 508-832-8555 (Fax 508-832-4142) John Capuano
BlueStar Machinery, Johnsburg, IL 847-497-9800 (Fax 847-497-9801) Sean Johnson
ACT Inc, Fullerton, CA 714-441-1992 (Fax 714-441-1923) Randy Goodman
Lakeshore Machine Tool LLC, Racine, WI 262-635-8801 (Fax 262-635-8808) John Rogers
Cleveland Machinery Sales Inc, Cleveland, OH 216-741-8900 (Fax 216-741-8995) F. Petitt
Used Machinery Sales LLC, Elk River, MN 763-441-5152 (Fax 763-441-5075) John Roedel
BlueStar Machinery, Johnsburg, IL 847-497-9800 (Fax 847-497-9801) Sean Johnson
Back to category listings.
Specifications
Benefits
Applications
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Application Data (tool description for CAM software)
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CM404-100B-001SET Carving Bit Set |
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4-flute premium tool |
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Friday, 21 September 2012
CNC drilling machine - FINISHED!
With the new path finding routines in our CNC drilling software, and
changes to the firmware to allow the user to manually jog the drill head
up and down to get more precise alignment during initial set-up, we're
finally happy to say that our cheapo CNC drilling machine is finally
complete.
Or at least, complete to a state that we're happy to release for anyone else to have a go at making their own.
The last little part of the test was making sure that the machine could drill a PCB even when placed on the cutting bed at an angle. Here's a video showing exactly that:
The drilling is accurate enough for us now (there's still a little bit
of play in the x-axis, but we seem to have done enough to remove/reduce
any play in the y axis, even when the bed still needs to travel
up-and-down in order to correct for the board being at an angle)
Here's the final board, as drilled in the video:
The holes on the bottom-right-hand edge may not be absolutely bang on, but they're good enough to make the board usable, and are about as accurate as you could get by drilling the board by hand. The photo seems to emphasise the amount of drift - it's probably less than 0.5mm away from the centre of the hole.
Having successfully completed a cnc drill test, we put the machine away!
We reckon our machine fulfills all the criteria set in the CNC drill challenge.
It's been a long (and sometimes painful) journey, but it feels great to finally complete a project, not just to a point where it's working, but to be able to compare it to a list of criteria drawn up at the start, and to be able to tick every one off the list!
Along the way we were introduced to brushless motors and their servo-protocol control boards, created our own stepper motor control boards and our own USB-based protocol for moving them, and proved that rack-and-pinion gearing can be used just as successfully for CNCs as belt drives and leadscrews.
If we were to do the whole thing again?
Probably it'd look pretty similar. Maybe instead of a travelled bed-on-wheels we might use rails (similar to the x-axis) because there is a lot of play in the y-axis. But then again maybe not?
Any improvements?
Of course. Better stepper motors would be a great start. When energised, a stepper motor should have no movement in it at all - our steppers have 1mm-2mm of play because of the internal gearing. But then again, this does give us simple movement commands - no messing about with micro-stepping or any of that tricky stuff! We love the simplicity of the rack-and-pinion approach: belt-drives and leadscrews may be more popular, but we reckon we'd stick with ours.
The custom software is enough to make the device usable, but the protocol for sending x- and y- axis values is so simple that allow anyone else can write their own controller software. The latest firmware not only allows you to set a the number of steps to move in both x- and y- axes, but you can also now provide a "ratio" (for every three steps in x, move one in y for example). This means that if a vector line is broken down into enough parts, the machine could be modified to do simple milling - an idea that Justin from BuildBrighton is already working on!
Or at least, complete to a state that we're happy to release for anyone else to have a go at making their own.
The last little part of the test was making sure that the machine could drill a PCB even when placed on the cutting bed at an angle. Here's a video showing exactly that:
Here's the final board, as drilled in the video:
The holes on the bottom-right-hand edge may not be absolutely bang on, but they're good enough to make the board usable, and are about as accurate as you could get by drilling the board by hand. The photo seems to emphasise the amount of drift - it's probably less than 0.5mm away from the centre of the hole.
Having successfully completed a cnc drill test, we put the machine away!
We reckon our machine fulfills all the criteria set in the CNC drill challenge.
- You can load NC compatible drill files to operate the machine
- It cost less than £50 to build, completely from scratch with new (no salvaged) parts
- It's accurate to within 0.5mm (despite the dodgy cheapo stepper motors)
- The footprint is less than a sheet of A4 (in storage mode, it's about 210mm x 160mm)
It's been a long (and sometimes painful) journey, but it feels great to finally complete a project, not just to a point where it's working, but to be able to compare it to a list of criteria drawn up at the start, and to be able to tick every one off the list!
Along the way we were introduced to brushless motors and their servo-protocol control boards, created our own stepper motor control boards and our own USB-based protocol for moving them, and proved that rack-and-pinion gearing can be used just as successfully for CNCs as belt drives and leadscrews.
If we were to do the whole thing again?
Probably it'd look pretty similar. Maybe instead of a travelled bed-on-wheels we might use rails (similar to the x-axis) because there is a lot of play in the y-axis. But then again maybe not?
Any improvements?
Of course. Better stepper motors would be a great start. When energised, a stepper motor should have no movement in it at all - our steppers have 1mm-2mm of play because of the internal gearing. But then again, this does give us simple movement commands - no messing about with micro-stepping or any of that tricky stuff! We love the simplicity of the rack-and-pinion approach: belt-drives and leadscrews may be more popular, but we reckon we'd stick with ours.
The custom software is enough to make the device usable, but the protocol for sending x- and y- axis values is so simple that allow anyone else can write their own controller software. The latest firmware not only allows you to set a the number of steps to move in both x- and y- axes, but you can also now provide a "ratio" (for every three steps in x, move one in y for example). This means that if a vector line is broken down into enough parts, the machine could be modified to do simple milling - an idea that Justin from BuildBrighton is already working on!
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| China (mainland)
| Full catalog: 30 products
Drilling and Tapping machine High-speed Drilling and Tapping machine, Customized Requirements are Accepted
Min. Order: 1 to 99 Set
Metal Laser Cutting Machine Metal Laser Cutting Machine, Applied for Cutting and Drilling the Carbon Steel
Min. Order: 1 to 99 Set
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Above CNC Drilling Machine suppliers include wholesale CNC Drilling
Machine, CNC Drilling Machine from China, India & Worldwide. Back to
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Instant and convenient updates on the exact product categories you want
Other Services
Drilling and Tapping machine High-speed Drilling and Tapping machine, Customized Requirements are Accepted
Min. Order: 1 to 99 Set
Shenzhen 1064 Laser Technology Co. Ltd
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| Full catalog: 30 products
Metal Laser Cutting Machine Metal Laser Cutting Machine, Applied for Cutting and Drilling the Carbon Steel
Min. Order: 1 to 99 Set
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The availability of inexpensive electronics has again changed the way speed control may be applied by allowing continuously variable motor speed from the maximum down to almost zero RPM in CNC big bore lathe . This had been tried in the late 19th century but was not found satisfactory at the time. Subsequent improvements in electric circuitry have made it viable again.
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