The Shopbot PRSalpha is a 12' x 5' CNC wood router, great for high-end sign making. Authorization requires completion of a class. Check Eventbrite for details.
The Vcarve Pro Trial software can be downloaded from Vectric's Makerspace page:
MakeIt Labs VCarve License Info
From "Machine" and "Machine Configuration" click on the Cloud icon. Select the Shopbot PRSalpha 144-60 and use the INCH Post-Processor.
Calculating Speeds and Feeds
Recommended Spindle Speed for material and tool (Max around 17,000 - 18,000 RPM)
Number of FLUTES on your tool
Diameter of your tool
Adjust your FEED RATE until the "Chip Load" (which the software will calculate) in the software is in the range specified in the chart above
Start LOWER, and work your way HIGHER. Rule of thumb - start low, increase until you hear some loading, then back-off about 10%.
(Pass depth should be about equal to tool Diameter)
If cut depth is 2X dia - Reduce chip load by 25%
If cut depth is 3X dia - Reduce chip load by 50%
*correction factor from freud tools
Files and Resources
Some Recommended Materials/Consumables
Signmaking CNC Router Bit Set: Freud 87-108 8Piece CNC Router Bit Signmaking Set
Paint Mask: Oracal Oramask 813
Pencil holder is in rack with collets. Use 1/2" Collet for pencil holder
Adjust Z-Height manually to touch/feel - VERY LIGHT PRESSURE against material.
Recommended to use a "Single Line" font-type.
The "L" number in the name is the number of lines in the font.
Strong recomendation to use the SIMPLEST font possible, with streightest of lines. (Curves are VERY slow to draw!)
Prep for Drawing
Use "Quick Engrave" toolpath.
Select "BKG Pencil" tool in material database.
Don't do any more than like a 0.02 depth/pressure
Use "Outline" mode.