high speed cnc milling machine
21 November 2009, 08:03 PM
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high speed cnc milling machine
Taking a total chance with this but does anybody on here have experience of using high speed cnc mcahining centres?? We have just bought one brand new and are a bit unsure on the speeds and feeds we can run etc.
21 November 2009, 10:10 PM
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In my day each specific material had a "suggested" cutting speed, all the nano-tech in the world won't alter that.... but that was 20 years ago ! 
IMHO
dunx
IMHO
dunx
22 November 2009, 10:46 AM
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The cutter companies offer suggested speeds and feeds but we have played about with them and managed to double this suggested ratio. I was hopefully after somebody saying here is a list of cutters and speeds/feeds
I guess i will just have to carry on experimenting. Our other machine only does 4000 rpm but this one does 12000 so its a totally different ball game.
Cheers anyway
I guess i will just have to carry on experimenting. Our other machine only does 4000 rpm but this one does 12000 so its a totally different ball game.
Cheers anyway
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22 November 2009, 11:09 AM
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I would have thought the speeds etc. suggested by the company who made the machine would be as good as any.
You could always contact them and ask them I suppose. Best not to risk damaging the machine anyway.
Les
You could always contact them and ask them I suppose. Best not to risk damaging the machine anyway.
Les
22 November 2009, 05:04 PM
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22 November 2009, 05:19 PM
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I buy M'c centres to put them into automotive production lines, tool them up, program them etc.
Need more info really to be of any use.
Material - Steel (if so what kind, a BS or EN number if you have it), ally, iron, stainless etc?
What kind of milling? Are you face milling, side milling, boring, drilling etc. Do you have a surface finish tolerance on the finished feature? are you trying to block out and finish with the one cutter? Would also need to know the depth of cut if you are face milling. Don't forget you want to be climb milling with a CNC as opposed to conventional direction for manual machines
The kind of tooling has a massive bearing, i.e if you are just using a face mill how many tips does it have, what presentation angle is the cutter etc. Your workholding set up will be crucial as well.
TBH, it's not the kind of thing that any engineer worth his salt would feel comfortable about advising on the internet, you really need to have a look at the job at least, and preferably test cut. Wilth some info i could give you a feed per rev figure to start with, but thats all it will be - a starting point
The tooling companies will always give you safe figures. Out of literally thousands of tools i have put into m'c centres and lathes, i could count on one hand the times i have not been able to improve on the manufacturers speeds and feeds and still keep good tool life.
Need more info really to be of any use.
Material - Steel (if so what kind, a BS or EN number if you have it), ally, iron, stainless etc?
What kind of milling? Are you face milling, side milling, boring, drilling etc. Do you have a surface finish tolerance on the finished feature? are you trying to block out and finish with the one cutter? Would also need to know the depth of cut if you are face milling. Don't forget you want to be climb milling with a CNC as opposed to conventional direction for manual machines
The kind of tooling has a massive bearing, i.e if you are just using a face mill how many tips does it have, what presentation angle is the cutter etc. Your workholding set up will be crucial as well.
TBH, it's not the kind of thing that any engineer worth his salt would feel comfortable about advising on the internet, you really need to have a look at the job at least, and preferably test cut. Wilth some info i could give you a feed per rev figure to start with, but thats all it will be - a starting point
The tooling companies will always give you safe figures. Out of literally thousands of tools i have put into m'c centres and lathes, i could count on one hand the times i have not been able to improve on the manufacturers speeds and feeds and still keep good tool life.
22 November 2009, 05:38 PM
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Dunno why but I find these fascinating to watch wile their working. I never got to work on a CNC my self, the one at college was always broken. I did a couple of pieces on a old manual milling machine. Forgot the name of it but I did a few simulations on a comp program for CNCs as well.
I went on a few visits to different places & saw them in action, one of them was Rolls Royce, thought it was amazing seeing the lumps of metal going in & intricate cuts being made before the finished part came out.
I went on a few visits to different places & saw them in action, one of them was Rolls Royce, thought it was amazing seeing the lumps of metal going in & intricate cuts being made before the finished part came out.
Last edited by ScoobyDriverWannabe; 22 November 2009 at 05:39 PM.
22 November 2009, 06:07 PM
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22 November 2009, 06:12 PM
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I use a 'normal' CNC mill, and find that the tooling companies have very broad
speeds and feeds in their info.
I always start in the lower range and work up going by noise, surface finish and chip/swarf form.
From what I've seen of true high speed machining, it has very high speeds and feeds with lots of small cuts.
machining aluminium
speeds and feeds in their info.
I always start in the lower range and work up going by noise, surface finish and chip/swarf form.
From what I've seen of true high speed machining, it has very high speeds and feeds with lots of small cuts.
machining aluminium
22 November 2009, 06:13 PM
#15
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"If the swarf's not blue, your bonus won't come through" quote from one of my old bosses.
You'll soon know if the speed or feeds are wrong, the tool will snap off or weld itself to the job, done me no harm in 25 years!
You'll soon know if the speed or feeds are wrong, the tool will snap off or weld itself to the job, done me no harm in 25 years!
22 November 2009, 10:46 PM
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All in the public domain. 
Just need to know where to look.
https://www.scoobynet.com/trader-ann...df-racing.html
Just need to know where to look.
https://www.scoobynet.com/trader-ann...df-racing.html
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