High Speed Spindle for Taig - Brushless Motor?
Ok, so I broke down and bought a high speed spindle from Wolfgang for my soon-to-arrive Taig. Since he just released a heavy-duty Taig mount for his spindles, the combined purchase was too hard to resist. :)
I'll be using the spindle to finish mill 6061-T6 aluminum using 1/32" cutters. The spindle includes a 540 can motor (brushed and inefficient) running flatout at 20K RPM, but I'd like to use a brushless motor instead.
The spindle is rated at 100K RPM, but I'd like to target around 40K RPM.
The brushless hobby motors used in RC airplanes look perfect, but I'm not sure they can handle the continuous operation (up to 12 hours continuous). I would suspect that the bearings would be the part that would fail over time, and I'd like to run it at 20K RPM using a 2:1 belt between it and the spindle, giving me 40K RPM at the cutter. Load would be light, since the 1/32" cutter would be eating at only about 15 IPM max.
However, I don't want to waste my money buying something that might be unsuitable. Has anyone else used a brushless motor like this with their CNC mill? Are any "warning bells" going off in your heads as you read this?
Thanks,
---Will
A mild cough should get it.
Here's a typical result from MePro.
1.0 watts. You could blow the material off with a mild cough.
endmill HSS
diameter (mm) 0.8
flutes 2
cut depth (mm) 0.4
cut width (mm) 0.8
surface speed meters per min 90
rpm 38000
mm per tooth 0.00409
mm per rev 0.00817
mm per minute 317
power required (Kw) 0.001
material removal rate (cc per min) 0.102
Phil
Quote:
Originally Posted by
GammaWill
Regarding torque, I wonder how I can calculate that? Does anyone know how I might determine the torque on a 1/32" 2-flute end mill running at 40K RPM, cutting .00625" into 6061-T6 aluminum at 10 IPM? I suspect it is negligible at that rate.