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Old 03-17-2014, 04:49 PM
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Default Tooling for cabinets

I am thinking 3/8" down cut end mill for dados,

Do I want to use a FEM or a normal end mill.

Also thinking of 5mm compression bit for shelf pin holes and cut out.

Any thoughts? My main question is really about using a FEM or not for the dados.
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Old 03-17-2014, 04:57 PM
rcrawford rcrawford is offline
Cobra Owner
Join Date: Dec 2011
Location: Alberta
Posts: 2,226

I like the downcut endmill for dados, because it gives a clean top edge. There are dado compression bits that have a very short upcut portion at the end - I've heard these are better for dados, but I've never tried them. Normal compression bits don't work well because the upcut portion is too long.

I like 3/8" compression bits for cutting out parts.

The 5mm compression is not the best bit for drilling shelf holes. The upcut portion will give tearout as it starts, and the chips won't clear once the downcut portion enters the hole. I would use 5mm boring bits (or even regular 5mm brad point drill bits). When I drill, I slow the rpm down (for 3/8" I use 3600rpm and I might go up to 5000rpm for 5mm).
Russell Crawford
Cobra 408 ATC with recoil
Alberta, Canada
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Old 03-17-2014, 05:23 PM
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Gary Campbell Gary Campbell is offline
CNC Tech & Trainer
Join Date: Dec 2012
Location: Marquette, MI USA
Posts: 2,794

Russell is right on. Use a down spiral or mortise compression for dados. Use a drill for drilling. I suggest you use a 3/8" compression or mortise compression for perimeter cutting. The 5mm compression reduces speed way beyond it value due to how slow it must be run.
Gary Campbell
CNC Technology and Training
The Ultimate Woodworking Machine

"There are 10 kinds of people in the world. Those that understand binary logic, and those who don't"
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Old 03-17-2014, 06:36 PM
eandico eandico is offline
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Join Date: Jun 2010
Posts: 1,281

I used a 5mm compression on my first cnc.
It did not have tool change and it was quicker to use the same tool for all holes dados and cut out. That is what they were designed for.
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