Adding a new acrylic bit

[StephenN (Stephen Nemeth)]

What would be the best way to add a bit to a specific library?
I have a 3 flute upcut spiral bit I use for acrylic but there is only available 2 and 1 flute options to select from.

I would like to take advantage of the increased speeds and feedrates of the 3 flute bit but have no idea as to how to calculate the for those speeds so I can enter them into the system accurately…

Anyone have any experience in doing this? Is there a formula I’m missing somewhere?

Thanks in advance,

Stephen

[Julien]

The process for adding custom tools in a user library is described here:

Adding tools in CC440 and later

This is a bit different — the tools are now stored in CSV files (do Help | About | Open Data Directory to access the carbidecreate/tools directory), and it is first necessary to add a New Library: [image] after clicking on the “New library” button you will get the “Create new library” dialog: [image] make appropriate selections (note that certain endmills only appear in certain materials — at this time, MDF has the most complete listing — further note that one aspect of this is the suitabil…

Feeds and speeds:

• my (long) version of the story here:
  Feeds & speeds - Shapeoko CNC A to Z
• short answer to your question: bump feedrate by 3/2 if going from a value for a 2flute, to a 3flute of the same diameter

[StephenN (Stephen Nemeth)]

thank you! good to know also on the 3/2 value