General > General Technical Chat
Rotary tools in support of electronics, Dremel and more ..
robrenz:
I have often considered using a brushless inrunner helicopter motor and its corresponding controller to do a awesome high power mini die grinder/ bore grinder using an ER8 collet milling extension as the spindle shaft. I would use a preloaded ball sleeve bearing at the nose to keep the diameter small and a preloaded angular contact pair at the back to control the axial motion. My real job is designing and building high precision spindles. Material costs would be about $300.00 so not a real practical thing but it might still happen.
nukie:
rob, have a look at this, I have a earlier version made out of ceramic bearing spindle and it has amazing precision.
http://www.ebay.ca/itm/All-New-1-8-12V-TB-650-Package-Deal-CNC-Router-Spindle-/170877195518?pt=LH_DefaultDomain_0&hash=item27c91314fe#ht_2047wt_1396
It works very well with R/C brushless motor. It actually heats up after while even when it's doing nothing due to the bearings, it's ceramic so heat don't really expand it so it stays precise.
I have this model
robrenz:
Very nice video. He's not making much money on that spindle setup if any.
Carrington:
Some images of the PROXXON FBS 240/E (superb machine):
Carrington:
The Proxxon FBS240/E uses a triac and then the waveform (AC) is rectified with a diode bridge (DC).
So it is much more eficiciente than one AC motor with the same power, and is less noisy.
I've had two dremel, both burned, his AC motor only makes noise... And its design and construction compared to PROXXON is garbage.
I can't understand why Dremel and Proxxon have a matching percent in this poll.
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