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By jrbloom

November 25, 2021, 3:22 pm

Full depth cuts in plywood


I am fairly new to both CNC and HSMAdvisor, so this is probably a stupid question :-)

I am preparing a post for cutting out kitchen cabinets in 19mm hardwood ply, with a 1/4" solid carbide spiral endmill.

When hand routing I generally never go deeper than the cutter diameter, based purely on the feel of tool. However, HSMAdvisor is happy to give me some recommended F&S's for a full-depth/full-width cut.

My question is, can I be reasonably confident that this will not break the tool? Or am I missing something? HSMAdvisor shows the force/torque to be only at 13%, which suggests it is well within the capabilities of the mill. But it just, feels wrong :-)

Secondly, is it actually a good idea to back off the feedrate? This shows an increase in tool-life, but this contradicts what I have read on Google, re not 'babying the cut'. Am I actually better taking the 100% feedrate, so that the Feed and Speed are properly matched?



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Eldar Gerfanov

November 25, 2021, 4:00 pm
Updated by: Eldar GerfanovDecember 4, 2022, 1:05 pm


I did test cuts in different materials recently and the 2 and 3 flute end mills for aluminum worked fine. Didn't break a single one.

But. I have a 500lb hobby CNC machine and if yours is lighter/weaker, you may run into issues.

When in doubt (new material/tool/holder) always start slow.

This is what I always do and recommend to everyone.

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