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post #1 of 6 (permalink) Old 09-09-2014, 04:23 PM Thread Starter
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Default Foam Shadow boxes

I am new to CNC machining, and my company has asked me to learn speed and feed rates to cut foam Shadow boxes. the foam being used is called 4# crosslink, it is a polyethylene foam plank. I have done some testing on this foam, with double flute up cut bits, for pockets and have gotten fair smoothness on the walls. the end user wants better like always. I have increased RPM and lowered feed rate, but the bits are breaking. Then I have tried slower RPM and lower feed rate as well with no luck. So I am thinking it might be the BIT I am using. Has anybody cut this foam and will be willing to share some information on bits, rpm speed, and feed rate that has worked for them, before I go and spend another $300 on the same bits.

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Chris
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post #2 of 6 (permalink) Old 09-09-2014, 04:41 PM
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So I am thinking it might be the BIT I am using.
Thanks
Chris
what bit are you using???

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
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post #3 of 6 (permalink) Old 09-09-2014, 04:55 PM Thread Starter
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I am currently using Amana solid Carbide Spiral Foam up cut bits, ranging from 1/8"- 3/8" dia. depending on how much material is needing to be removed
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post #4 of 6 (permalink) Old 09-09-2014, 05:34 PM
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I am currently using Amana solid Carbide Spiral Foam up cut bits, ranging from 1/8"- 3/8" dia. depending on how much material is needing to be removed
believe it or not... try these bits.....
each one is a tad different... lots to pick from...
the saber cut... underlayment... laminate..

Cut-Off Wheels

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

Last edited by Stick486; 09-09-2014 at 05:37 PM.
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post #5 of 6 (permalink) Old 09-10-2014, 08:35 AM
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What you are doing is closer to production light metal CNC machining. Try a end mill house like W T TOOL to find inexpensive bits to play with. You might also want to vist Practical Machinist - Largest Manufacturing Technology Forum on the Web - this is a production/industrial group similar to Router forums but dedicated to your type of problem - these guys are CNC pros and use the tool 24/7.

Baker - do not go through alone unless your question is really stupid- good luck
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post #6 of 6 (permalink) Old 09-26-2014, 07:28 AM
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You are breaking bits?
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