Cnc Machine Micro Milling

We are using the I-OPENER to display the EMC gui up less desktop space and we didn't have an extra monitor laying around to begin with.
I then drilled them on my big Delta drill press after the pockets Since the new bearing blocks are much smoother and better aligned than the stock block, the table moves without any noticeable binding. The stepper standoff are 1/2" diameter drill rod about 2" long. TurboCNC was used to perform this speed test since EMC can't output more than 13,000 steps/sec on the 400Mhz PC.
We filled in the engraved text with A test engraving on a 3" x 5" block of MDF using a. Shown is the "TKemc" gui, we've since switched to the "mini" gui.
We used a set screw lock collar before sometimes slip under heavy milling stresses. 5/11/2006 Start of our Z Axis ballscrew conversion. The motor was hooked up to the driver as bipolar half winding set at 3amps. Mill does a much better job on plexiglass.

The axis would just bind up instead. The whole head assembly is now solid with very little backlash. We are currently building a larger 30"x30" gantry mill and the CNC micro-mill will come The Sieg X1 micro-mill was purchased from Harbor Freight. The bottom bearing pocket is made a bit larger diameter so the bearing can self-align with the top one. It runs under a variant of Real-Time and is open source free. Made a fixture mounting plate out of a flat piece of 6061. 7/22/2007 Made a tramming alignment tool to quickly tram the Proxxon spindle. The mill does a pretty good job engraving metal and plastic. 5/21/2006 When we received our extended Y axis base from LMS, it came with a very thin steel gib strip. Z-axis stepper mount and head counterweight assembly. Milling out some bearing mounts. I can report the table has less vibration when cutting aluminum. This idea was from Little Machine Shop which sells a similar but larger diameter tool to help tram mini mills.
Another Yahoo newsgroup *8 microsteps X 200 steps/rev X 20 thread/inch lead screw = 32,000 steps/inch.
I haven't needed to re-tightened the gibs screws at all.
The leadscrews still needs to be cut down to correct length. The plastic on this project box is a bit soft. Wiring is a bit messy but clip graham heather movie nude may mount everything in a large box one day. The correct sized tap was purchased from Wholesale Tool for $20. Angular contact type bearings would work better but are much more expensive. I hate removing the vise from the table having to square it back up again when done. It is a bad idea to use a drill chuck to hold endmills. The X axis travel is almost a full 9 inches. Back left corner is a small Power One 12v supply that is running the 5" fan, very left, cooling the driver boards. This was purchased from Little Machine Shop. Even though the specs list the motors as having less torque when hooked up half winding, there is certainly plenty of torque to move the table atleast 60IPM.
375" ground steel stock for $5 and make a new gib strip.
The drill program is used with a center3 drill bit to mark the mounting holes. The bearing pockets are milled out using a.
The plate was easy to make and every little bit helps to improve seven of nine adult this mill. If the drivers boards were mounted inside a enclosed case, a fan would be recommended to help keep everything cool.
The maximum Y table travel is about 7" and X is 13". The end was also turned/threaded for a 8mm locknut and lovejoy coupler. 6/11/2006 Made a new 1" thick Z column riser plate out of steel. The above gcode will probably not run correctly machine controller without modifications.

1/18/2006 We received our extended X-axis table dual fuel kenmore range from LMS. So far we have used the mill to make cutouts and lettering on boxes for our electronic projects. 031" diameter My first 3D baby picture carving in cherrywood. Not the most elegant solution but it works.
The fan isn't really needed since the heatsink is rather large but we used one anyway. 10/27/2006 We finally purchased a MACH3 license from Art. 1/19/2006 I installed the extended X-axis table which works very nice. Having no 1/8" thin steel stock available, I used a piece of brass from the local hobby shop. Trying to tighten the original city diocese joseph kansas st steel gib strip this much just results in the table binding up. 2mH On my test bench, I was able to spin these motors at 1700RPM using our Microstep driver with a 48volt power supply. Right side is an old PC/AT power supply case. The ends have been machined on the lathe to fit dual bearings and threaded for the bearing lock nut.

Using a 3/8" diameter end mill, 2000RPM, cutting at 10IPM. 5/2005 Our new 130mm extended Y axis base purchased from Little Machine Shop There is a problem with the gib strip that was shipped in the upgrade kit, it is too thin.

Although the brass will wear faster then steel, the gibs were easy to make so replacing them with new ones will be no problem. The 1/8"shaft was chucked in the mini-lathe and the bottom of the disk was cut flat, smooth and perpendicular to the shaft. A new mounting face plate was milled out to fit the smaller diameter motors, a relatively easy task when you have a cnc.
The cnc was again used to mill out a. Samba was installed on the EMC PC to make it easy to transfer g-code files from our main cad workstation located upstairs.

They can probably run faster but I only have a 36volt power supply on the mill. This is a Windows XP based cnc gcode controller program. Rapids are currently set at 15ipm @ 32,000* steps/inch. Material is 6061 AL, end mill is 1/4" Carbide. The original plate is 11mm thick. This isn't really any fault of Little Machine Shop since they are just the importer. Currently only 3 drivers are installed but there is room for a 4th one.
The ballscrew was purchased from Homeshopcnc with the upgraded pre-loaded ballnut. I highly recommend this modification if you can make them. They run much smoother than the previous motors used.

This is a much affordable home in maine nicer EMC graphical Top shelf holds the electronics, our custom made microstepping chopper drivers mounted to a big heat sink. This picture was taken before we received our end mill file tax online rapid refund holders and MT2 collet Plastic engraving example. We will eventually use the cnc to mill mounts out of aluminum once everything is working to our satisfaction. Output is 36volts@10amps, plenty enough to drive the steppers. 125" so it made a perfect slot for the brass strip to fit in. .

The ballscrew was to hard to turn on my 7x minilathe so a 1/4" hole was drilled at one end of the ballscrew with a carbide endmill.
6/11/2005 Finally got around to making aluminum bearing mounts for the mill. The our own design using LMD18245 with a 16F84 PIC doing the microstepping translation. The bearing was purchased from Enco and we made a set screw lock collar on the Our quick and dirty Z-axis counterweight setup. After about 5 months of use, the X and Y brass gib has performed great. These old PC/AT PS cases are nice since they have a convenient big red on/off switch and standard AC plug connector. 9/13/2006 Newer images of the mill. There is also a Yahoo newsgroup that has more info on CNC conversion of this micro mill. I used two 22mm skateboard bearings with a set screw collar to lock them in place. Every machinist should own a copy, mine was purchased off Ebay. The mill also does pretty decent metal engraving. There's a 10Mbit hub back there connecting the two computers to the main 100Mbit LAN.

. The datasheet specs for these 8 wire dual shaft motors are listed as: Keling Technology model 23H276-30-8B Unipolar (half winding) 1.

Even with the thin gib strip, the extended base works much better then the original. 5/22/2006 The Y axis works so good that I also made a brass gib for the X axis. We are considering purchasing a licensed copy of MACH2 and dumping EMC in the near future. The demo limits the maximum speed so not really sure what a fully licensed version will do.
You can download the free edrawing viewer from solidworks. I don't recommend using these motors hooked up bipolar series unless you have a gecko type drive with 70volt power supply. The LCD screen shown at right I-OPENER running win98. Stepper motors are Ebay surplus 150oz/in. Power supplies, drivers and Linux PC are located on a shelf below the workbench.
The working Z travel is less due to the addition of the end mill holder/collet, vise height and end mill length itself.
It is much easier to clamp the mounting plate on the vise than to use the mill table itself.
The hole size was taken from the Machinery Handbook tapping chart.
The aluminum ballnut mount was more difficult to make. 375" end mill with multiple Z depth passes and lead in/lead outs. The end was turned down Comparison of old vs. EMC running under linux was very stable and I don't recall it ever crashing. This is a useful addition to our ever expanding tool collection. Lower shelf is the PII-400 running EMC BDI 2. Motor mounts are made from 1/2" baltic birch ply.

This makes it difficult, if not impossible, to adjust out all the play in the y axis. Anyone have any Dell plastic drive covers? lost ours.

The performance of these steppers on the mill is simply amazing.