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| 60KRPM Spindle |
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| DavidA:
PK, ..With dodgy hacks a tempting option at every stage. .. Specialty of the house here. Dave. |
| PK:
--- Quote from: PekkaNF on February 28, 2016, 05:43:29 AM ---What spindle is that? Aircooled? How many hours you have been using it? What seems to be proper speed range? --- End quote --- Always with the questions.... It's a 60,000RPM spindle (obviously), 300W and about 50mm diameter It's water cooled and has an ER-8 collet. Less than 15minutes run time on it to date, but that will change soon. I bought it for two reasons: 1. I did some 3D machining of MDF vac forming plugs last year, lots of fine cuts at 20KRPM... Those jobs took anything up to 6 hours to run on the big router and getting a decent finish was a hassle because the toolpath was only using the very tip of the ball nosed mill. The idea is that 6 hours at 20KRPM=2 hours at 60KRPM and this is good! 2. We sent a design off to be 3d printed as a final check before we had injection mould tooling made. When the prototyping company heard that these were t o be IM check parts they flatly refused to 3d print them and insisted that we let them machine them from ABS on their 5 axis machines. The parts came back absolutely perfect! I've had parts SLS and SLA printed before and they never looked anything like these machined parts. I could have easily sold them as finished product. So the intention is to add a couple of axii to the mill and try to find some 5axis CAM software so that I can do this at home. |
| PekkaNF:
Interesting. So plan is is to run it falt out max speed and very little reason to run it on any slower speed? Reason is that I considered making a little PCB etc. mill and no matter how I calculated I was returning back to TEFC 24k rpm units as a starting point. I never started because I really didn't have much experinece on those, but I got the impression that they were happy on fairly narow speed/load curve. I would think that water cooled has somewhat better speed/load envelope to work with. Therefore I wasked about speed range. That is not ofcourse any problem if it can be and is run narow speed/load envelope. Edges of that GRP looked nice. Swarf did not seem to come out even with vacuum, but were easily blown out. Milling MDF is a pain. Sealing MDF for molding is a pain. Pekka |
| PK:
--- Quote from: PekkaNF on February 28, 2016, 09:14:16 AM ---Interesting. So plan is is to run it falt out max speed and very little reason to run it on any slower speed? --- End quote --- Yep, an ER8 collet just cant hold a carbide tool that needs a slower rpm... I do intend to give PCB milling a go. I made some engraving bits to do it. Again, all the info I could find described it as a slow process so more RPM=more feedrate=more good. |
| JHovel:
PK, looking very good! Can you give me a little more detail on the spindle please? The video shows you setting the VFD frequency to 600Hz. That equates 36krpm for a 2-pole motor. Does that spindle have a stp-up gearbox? Or does your VFD and motor allow 1000Hz operation? Very interested! Cheers, Joe |
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