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| 60KRPM Spindle |
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| PK:
Been chipping away at this one for a few months. It turned into one of those projects where you had to fix this, before you could change that, before you could upgrade this bit etc.. With dodgy hacks a tempting option at every stage. I managed to avoid the dark side and do most things properly... Still more to go but I had it making swarf today... |
| raynerd:
Hi PK, really interesting because my brother in law and I currently have some G10 stuck to the bed of our CNC router and we still haven't cracked a suitable cutting speed and feeds or cutter. We have recently purchased some 'chip breaker' titanium coated end mill advertised for cutting PCB. We tried some cheapo £2 cutters off eBay and it literally rounded the sharp cutting end within a few minutes! I'm interested to see how we get on with these. Your diamond burrs look to be going through this like cheese! What profile are your burrs? My spindle is 10,000 to 29,000 rpm idle. Is your 60k rpm necessary for the feeds you are using or necessary for using burrs in grp. Great post and I hope to learn more! |
| Spurry:
--- Quote from: raynerd on February 28, 2016, 03:57:07 AM ---....... currently have some G10 stuck to the bed of our CNC router and we still haven't cracked a suitable cutting speed and feeds or cutter. --- End quote --- How thick is the G10 you are trying to use? What is the maximum diameter of cutter you can use for the job? Never had a problem with G10 on my cnc machine with max rpm of 24k. Pete |
| PK:
So the cutters we use for composites all look a bit like this: http://www.ebay.com.au/itm/1-NEW-IMCO-1-4-250-SHANK-CARBIDE-BURR-DIAMOND-CUT-DRILL-POINT-USA-E413-/371562711422?hash=item5682dd097e:g:bQsAAOSwbqpT16NT I've got them from 12mm down to 1.6mm and have run them on spindles at 10KRPM, 20KRPM and 60KRPM and usually at full depth. Our big router has a 3.5KW spindle and hapilly runs the 12mm tool at >500mm/min. For the 3mm cutter I calculated about 0.02mm per rev but ended up running at half of that because the motor started to load up. I really suspect that the problem was that I couldn't clear the swarf out quick enough. In any case, 0.02-0.05mm/rev is a good conservative feed rate.... The cutters don't last very long, you'll notice wear after a few meters. The little ones snap, the bigger ones burn. Again, go nuts trying to blast the dust out to make 'em last.. |
| PekkaNF:
What spindle is that? Aircooled? How many hours you have been using it? What seems to be proper speed range? Pekka |
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