Selecting Belt Drives

[arvidb]

So to convert from torque (oz. in.) to hp or back, you also need to know the speed where that torque is produced (not the maximum speed and torque of the motor, but the speed and torque that can be produced simultaneously).

If you don't want to do the math above, here's a shortcut:

Power (in HP) = torque (in oz. in.) * RPM / 1,000,000.

That is, if I did my math correctly

Arvid

[IJ.]

Just done the belt and pulley thing here !

I ended up with 25 mm wide AT5 Synchroflex Timing belts as I'm using 700 oz Servo's on a Knee Mill retrofit.

It was interesting to see the recommendations the PC program spat out at the belt place dependant on the amount of belt wrap V's the centre distances between pulleys.

The AT5 belts is rated to almost 20 HP under ideal conditions but in my application this drops to about 1.3 HP due to the limited number of teeth engaged.

I initially thought 16 mm wide would suffice but after consulting with their engineer and crunching some numbers we arrived at the 25 mm belt.