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View Full Version : Feeds and speeds settings for compression spiral

Metal pecker
02-07-2016, 09:40 AM
Hi all,

I've been using my cnc routerfor the last two years for mainly drilling holes for shelf peg holes and hinge holes for kitchen cupboards.
I also use it for cutting various curves and L shapes on corner cupboards.

I have a 2kw spindle and up until now i've been using a twin flute 1/2 inch 50mm straight cutter as they're cheap

The material used is 18mmMFC (melamine faced chipboard) and my cnc can only currently cut 2metres a minute

I've just bought a single flute compression spiral 1'2 shank Onsrud solid carbide cutter

So, given that the feed rate is that slow, What speed do you think I should set my spindle to run at ?

JAZZCNC
02-07-2016, 10:54 AM
Honest truth is your machine can not run this cutter correctly without compromising wear and finish. You'd have been better buying more of cheap HSS as they'd be cutting more like correct so will probably last longer and give better finish. Carbide doesn't like being run incorrectly and will wear fast if not.

But to answer your question then a very very rough ball park figure would be find the correct feed n speed. Divide the feed by your max feed then divide the speed by this number. ie 7500mm/min 21,000rpm would equal 7500/2000=3.75 21000/3.75=5600rpm

But again this is very rough ball park figures and trail n error will be needed.

Metal pecker
02-07-2016, 06:41 PM
Honest truth is your machine can not run this cutter correctly without compromising wear and finish. You'd have been better buying more of cheap HSS as they'd be cutting more like correct so will probably last longer and give better finish. Carbide doesn't like being run incorrectly and will wear fast if not.

But to answer your question then a very very rough ball park figure would be find the correct feed n speed. Divide the feed by your max feed then divide the speed by this number. ie 7500mm/min 21,000rpm would equal 7500/2000=3.75 21000/3.75=5600rpm

But again this is very rough ball park figures and trail n error will be needed.

Thanks Jazz,
I've tried it on 8000rpm this afternoon, the chipload looked alot better than when I used the twin straight flute cutter but also I was running that at 18000 rpm ! temperature of the spiral was low. I expect though any new ultra sharp cutter would give a good finish but I'll try lower speeds tomorrow plus swap the toolpath settings to climb rather than conventional so it pulls the work towards the fence.

Your help is much appreciated, thanks again