[vojnik]

Hello!
I'm trying to calculate deflections on my new cnc machine. My machine is supposed to route in wood and plastics.
What's the cutting force for eg feed rate 500 mm/min, cutting deep 5mm, 5mm end mill, wood or plastic? Is it 10N, 100N or what.

You can also give me an exampel in imperial units!

A formula is welcome!

Thanks!

[jason07]

My formula charts are in my locker at school,but you could run that about as fast as you wanted. If I remember correctly,oak knots cut about the same as aluminum,so any wood softer than that would cut faster.

[neilw20]

Push it hard and when you get chatter (tool/machine deflection >= chip load) then back off a bit with the feed, that is unless you stall the steppers, then you really need to back off more.

[vojnik]

With "the new machine" I mean the machine that I'm trying to construct.

I have found some formulas but miss the bending strength for mdf and wood(pine, deal).
The bending strength for aluminum (and oak as jason07 said) is 800 N/mm^2.

Most of the time i will route in mdf and pine/deal and want to optimize the machine for that and when routing in harder materials I will reduce the speed and cutting deep.