## Calculating

This forum is for requests and queries about machine tool support for Vectric Products

### Calculating

When calculating the rough machining tool path I get a message that comes up - The allowance left on is greater than 20% of the tool diameter. What do I change?
Debbiebayneomeara

Posts: 12
Joined: Sat Aug 23, 2008 12:36 am
Location: Virginia

### Re: Calculating

the machining allowance at the tool path cut it in 1/2 and try again

jim
cabnet636
Vectric Wizard

Posts: 2583
Joined: Fri Dec 21, 2007 1:57 am
Location: columbia sc
Model of CNC Machine: CAMaster 508 ATC

### Re: Calculating

tried that...didn't work. Can you explain exactly what this message is telling me and what I should know to fix it?
crchisholm

Posts: 13
Joined: Tue Mar 14, 2017 6:28 pm
Model of CNC Machine: small ox

### Re: Calculating

In the roughing toolpath change the "Machining Allowance" to zero and try recalculating. The Machining Allowance can not be over 20% of the selected tool diameter. So if you choose a 1/8" ball nose for roughing your Machining Allowance has to be .025 or less.
John
Maker of Chips

highpockets
Vectric Wizard

Posts: 2571
Joined: Tue Jan 06, 2015 4:04 pm
Model of CNC Machine: PDJ Pilot Pro

### Re: Calculating

crchisolm:

The second half of this warning is a clue to the answer for your and the original (from 7.5 years ago!) poster's question. The amount of material left by the roughing bit might cause finishing bit to break, etc.

If you are certain that your finishing tool can handle cutting the amount of material left after roughing you can safely ignore this warning. If not, change the "Machining Allowance" to be equal to or less than 20% of the bit diameter. e.g. roughing tool 0.375"; machining allowance 0.0075".

If I'm roughing out EPS foam with a 3/8" bit I might leave 1/8" or more for the finishing ball end bit to clean up. The foam is so "soft" that a 1/4" or even 1/8" ball end bit will have no problems shearing it off.

adze_cnc
Vectric Apprentice

Posts: 757
Joined: Sat Jul 27, 2013 10:08 pm
Location: Vancouver, BC, Canada
Model of CNC Machine: AXYZ 4008

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