Reply by CherryWood

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Posted on Help with adding new bits and custom feed rates, cutting depths, etc.

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22 posts in 3718 days

#1 posted 12-09-2017 01:02 AM


There are books written and college classes to cover your question(S) – MANY.

There is SOOOOOO much in what you are describing here. I am a manufacturing engineer near retirement, so I have 40 year of experience doing what you are asking here.

Part of the problem online is – deciphering who “really” knows what they are talking about and who “thinks” they know what they are talking about.

I cannot answer everything you asked about in a forum like this – it is simply too much content.

Just a couple of tid bits.

1) Who ever said you cannot rip out 1” or 2” stepover? That is dependant on the machine, setup, tooling. Of course you can. Not with a Rockler Shark of a hobby level machine, but with an industrial machine with some muscle yes you can.

2) It’s more to do with the machine and the hold down, fixturing.

3) Not really knowing what you are doing – Rough cut step over in MY book is 75% to 90% of cutter. Finish stepover can easily be 90% – BUT – it depends on what you are doing

4) You can go 1” deep with a 1/4 mill – BUT – it depends——————

5) Watch the chips – they tell you all about performance.

6) On ball nose—use the BIGGEST you can fit into the curves and increase your stepover. Use a 2” or 3” if you can. Do a CAD layout so you can see the radius of the cutter and the effect on stepover.

DO NOT be making dust – DO be making chips.

Try to keep the RPM’s down to control heat. Speed is friction – friction is heat. Control the chipload with feedrate. Make chips not dust.

Soo – do some “trying” of different things in scrapwood. Test – experiment – DOCUMENT – try more test more – develop your process. I do that all day every day in my job. That’s how you learn.

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