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.
Last edited by Jonathan; 22-01-2011 at 03:23 PM.
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!
looks great, i love how simple these thing are :)
Make a walnut what?!
walnut whip ! .... shit joke.... sorry :)
im getting on fine using 350w 12v on my 1700w motor, i dont think you will need to throw 6000w at yours if your using it on your router
Last edited by blackburn mark; 20-01-2011 at 07:28 PM.
I ran the motor in for about 5 mins on 12v, soon got bored of that (I'll leave it running properly tomorrow). So I tried carefully grasping the motor body with some kitchen roll to protect my fingers - couldn't stall it, not even close . It merely drew 550w and about 53 amps. I'll have to think of a safer way of testing the power at higher voltages.
I think I'll stick with the batteries for now unless anyone can point me to a 50v PSU that can deliver a LOT of current. Maybe a few of those switching PSUs people have been using for steppers on eBay...
Last edited by Jonathan; 22-01-2011 at 03:30 PM.
The batteries I'm using to power it were going to be charged from my wind turbine. If only I had space to mount it...
I measured the runout again now it's mounted properly. I put a 10mm cutter in and measured 0.03mm about 10mm from the collet. If I put the DTI on the collet chuck itself it reads 0.01mm.
22-01-2011 #18I 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
You should be measuring the inside and i would measure at the extremes of the taper to see if you have different amounts of runout at the two points.
I used the lathe with 3 jaw chuck for a few of the bearing mounts for the screws - carefully designed the shape to fit the chuck easily.
I measured the runout inside. I'll try again like you said.
Just tried cutting with it. 7mm two flute cutter and some scrap aluminium. Using 0.5mm depth/width of cut it was happy. Sometimes 1mm, machine is a bit too wobbly to do more at the moment. I'll post pictures in a minute to save a thousand words...
The motor drew 30w extra whilst cutting, 100w idle.
Last edited by Jonathan; 22-01-2011 at 03:33 PM.
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