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20-01-2011 #1
It's alive!
Heated the angular contact bearing in oven, cooled the shaft and it dropped straight on.
Bit of a fiddle to get the rest together, but it went ok.
I've run it up to 3100rpm (24v) and it sounds fine. Slight noise from the bearing but I don't think that's significant.
I also measured the runout and it's less than 0.01mm.
Will post some more pics in a minute.
Attachment 3642
Attachment 3646
Attachment 3643
Attachment 3647
Attachment 3644Last edited by Jonathan; 22-01-2011 at 04:23 PM.
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20-01-2011 #2
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20-01-2011 #3
That makes two of us.
Make a walnut what?! But yeah, running it off two 12v 92Ah batteries for the moment. Not got a power supply which would supply anything like enough for this. Idling at 3100rpm it consumes 94w. 45w ish at 1500 rpm... that implies almost 200w just to spin the thing at full speed let alone cutting!
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22-01-2011 #4I ran the motor in for about 5 mins on 12v, soon got bored of that
phils point is confirmed as all three spindles produce less bearing heat as time goes by
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22-01-2011 #5
I ran it at 3100rpm for 20 mins. The angular contact bearing was very slightly warm - helped no doubt by all the aluminum around it. The stator got a little warmer, still nothing to worry about.
Managed to get 1.5kw out of the motor without it complaining.
I'll have to buy one of these soon to run it at 6200rpm:
http://www.hobbyking.com/hobbyking/s...dProduct=10944
or maybe
http://www.hobbyking.com/hobbyking/s...idProduct=4691
Either way it's a lot of money.Last edited by Jonathan; 22-01-2011 at 04:36 PM.
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22-01-2011 #6
Jonathan
Use a fine oilstone to de burr the slits in the collets as they can have tiny burrs which can be a cause of runout.
When checking the runout it the collet mark the high or low point so you can see that they are in the same place vertically when you measure both positions.
Phil
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26-01-2011 #7
Jonathan i have just seen the pictures of a sample of the cut produced by your machine with the spindle.
All i will say is you have balls of steel.
Phil
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26-01-2011 #8
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26-01-2011 #9
Sent you a PM
Phil
Sent from my HTC Desire using Tapatalk
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11-02-2011 #10
Hello
sorry for my bad english but you'v understood:i am french
i was very interested by your post
and am planning to put one BLDC motor on my home made CNC
can i ask you what kind of alim (not batteries)are you using for these motors and controller?
something like 24 or 48v and 40amp
i would be able to make one if i had a plan
thank you for your reply
Discoball
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