CNC Machining

From Narwhal Lab's Wiki!
Jump to navigation Jump to search

CNC Machining at Narwhal Labs

What is CNC?

CNC is an abbreviation for "Computer Numerical Control". Using "g-code", machines use coordinate-based commands to move and perform tasks. While many tools at Narwhal Labs use CNC technology such as our laser cutter, vinyl cutters, and 3D printers, CNC will most often refer to CNC routers and milling machines. Designs are created using CAD (Computer Aided Design) software and code to run the machines is generated using CAM (Computer Aided Manufacturing) software.

Our CNC Routers and Equipment

Narwhal Labs is equipped with an AvidCNC PRO2448 CNC router with a 2.2kW (3HP) spindle, a NEMA34 electronics package, proximity sensors, a corner finding touch plate, mach 4 control software, and a complement of tools and tooling courtesy of AvidCNC and Bits&Bits.

AvidCNC Cycle Start Checklist

  1. Locate the emergency stop
  2. Home all axis on the machine
  3. Confirm material dimensions
  4. Preview toolpaths/Run simulations
  5. Secure workholding
  6. Check router bit installation
  7. Verify work coordinate system (WCS)
  8. Review Mach 4 & G-code
  9. Test the spindle
  10. Re-install dust shoe

CNC Router Etiquette

  • CNC routers can be very loud and make unpleasant sounds. Check with others in the room before running
  • Please work with staff if you need to do long (1+hr) operations on a CNC.
  • CNC routers, even with dust collection, can throw dust and chips. Please be considerate of others that may be near by or that may be doing epoxy or finish work that is negatively affected by dust
  • Use ample workholding and tabs in your programs. Flying parts can be dangerous to you and those around you.
  • Please inform staff of any broken tools/tooling or machine faults so we can keep things running for all members. You will not be penalized for accidents.

Software

Our CNC router operates on Mach 4 control software.


We also have a license of vCarve pro that is located and running on our main laptop for the CNC router. You can use the free trial version of vCarve Pro on your personal computer or a Narwhal Labs loaner laptop to do all design and CAM work, then use the CNC laptop on-site here to export your G-code. The free trial enables all features except G-code export and has no time restrictions.


While Narwhal Labs does not endorse any specific CAD or CAM software package, our staff has some experience with Autodesk Fusion 360 and vCarve Pro and may be able to help you with this software if needed. Fusion 360 is a full-featured CAD and CAM package that is free for personal and education use.

Software Link
vCarve Pro https://www.vectric.com/products/vcarve-pro
AutoDesk Fusion 360 https://www.autodesk.com/products/fusion-360/personal

All CAM software and packages require a "Post-Processor" to generate code that our machines will understand. The latest post-processors for vCarve and Fusion can be found below.

Software Post Processor
vCarve Pro https://www.cncrouterparts.com/support/software/downloads/vectric/
AutoDesk Fusion 360 https://www.cncrouterparts.com/support/software/downloads/fusion/
SheetCAM https://www.cncrouterparts.com/support/software/downloads/sheetcam/

Feeds and Speeds

Feeds and speeds refers to the feed rate, spindle speed, and plunge depth of your CNC program for a specific bit. We maintain a list of suggested feeds and speeds for specific materials and tooling at the page linked below.
Main article: CNC Router Feeds and Speeds

Tool Libraries

Narwhal Labs maintains tool libraries for Fusion 360 and vCarve pro. These should be used as a guideline for known and safe operation. They are updated periodically with new tools and enhanced cut settings. Please ask about feed rates, spindle speeds, and cut depth if you're unsure about your cut or CAM work.

Software Package Tool Library Link
Fusion 360 Fusion Tool Library
vCarve Pro vCarve Pro Tool Library