Machine Info:

Free for educational use. Read here.

VMC 4000 Users Mailing List:

+dist+~cem/dlists/cncusers.dl@andrew.cmu.edu

Notes on Machining:

An on-line copy of the presentation for Rapid Prototyping class (spring 2001).

Generating NC files for VMC 4000:

1. Use SpectraCAD, SpectraCAM software that comes with VMC 4000:
   • Create your design using SpectraCAD, and save it in dxf format
   • Create a rectangular block and import your dxf file into SpectraCAM to generate NC file.
   • Load your NC file into Benchman control software to verify the NC code and run it on the machine.

 

2. Use ProEngineer 2000i to define your manufacturing processes:
   • Set up Pro/E to use our manufacturing files.
   • Create the part you want to manufacture and save it (.prt file)
   • Create your work piece and save it (.prt file)
   • In Manufacturing module, load your part and assemble it with your workpiece to create your manufacturing process (.mfg file)
   • Define manufacturing operations (refer to the use of the manufacturing files) and generate CL data (Use "LM4000" for 3D milling)
   • Generate NC data
   • .lst and .tap files will be generated.
   • Process your .tap file (if desired) using Mike's script in order to handle tool changes and coolant overrides.
   • Load your .tap file into Benchman control software to verify the NC code and run it on the machine.

 

3. Use IronCAD to design your part:
   • Design your part and export it in IGES (ProE) format
   • Import the part file into ProE.
   • You cannot make changes in the file, but can still use to in a manufacturing file (See above).

    

4. Other CAD/CAM programs [?]

    

5. CNC Milling on the LMC Benchman 4000 using Pro/Engineer 2000i2 [NEW!!]

Simple 3-axis CNC machining using Pro/Manufacturing

To help you get a quick start on simple machining, here is a page.

Mike's Perl Script Generating Simple NC files for Facing Your Workpieces

This script generates simple NC files that'll help you facing your workpiece; it works on our VMC4000 desktop milling machine in HbH 2204.

Verify this script on Benchman Software before running it. Make sure that the tool clears the fixture(s) you are using.

Link

Mike's Web Script for Post-Processing NC Files

Mike has written another script to enhance your Pro/E generated .tap files to better handle the manual tool changes.  You have the option of setting the tool height after each change using the feeler gauge, the manual sensor, or the automatic sensor.  You can also override the Pro/E generated coolant settings.

Upload your .tap file to this form, choose your options, and then save the resulting .nc file.

Things You Should Do/Know/Don't Do While Machining Parts:

• You should take a look at the notes walls and the checklist on the green laminated sheet before using the machine.
  
• You should not close the Benchman software when you're done. If you had to restart the program, 'home' it first.
  
• You need to remember the 'pin before spin' rule: You need to remove the pin/key you have used for tool change before turning the spindle on.
  
•  Send an e-mail to Mike Vande Weghe if you drop/crash/break a tool.
  
• While changing tools, you should hold the tool (not only the collet) while banging on the hex key. Alternatively, make sure that there is something soft [See third drawer from the top] on the part/vise to soften the drop of the tool.
  
• Use black side of the mallet for the hex key [while changing tools], and green side for the part [while setting the part on the vise].
  
• If you see lots of tools lying around, please put them back to in their respective drawers, before you leave.
  
• Please take time to clean up after yourself when you are done using the machine. Take out the tool you have used; you may leave the collet in. There are soft brushes and rags you can use to wipe things down, and a broom and dustpan to clean up the floor. No one else wants to clean up your mess.
  
• Taking the 4th axis off: 
  If the 4th axis positioner is in your way, you can remove it. But be sure to power off the machine before unplugging the positioner cable from the back wall of the machine, and remember to insert the connector plug, sitting on the right shelf of the machine, before turning the power back on.
  
  NOTE: If you are able to work without removing the positioner, however, that is much better; it is a time-consuming process to align the 4th axis positioner each time.
  
  
• Don't forget to wash your hands if you use the coolant.

Web resources:

• CNC magazine

G and M Codes:

Last update: July, 2001