So we need a motor y'see, to drive a relatively low-speed (300-400 RPM or so) light load, more or less continuously for six-to-eight hour periods. It's a long story, but picture a rotisserie roasting a chicken at the supermarket.
We can't use motors with brushes (fire hazard, this is in the food industry), but there is plenty of compressed air available.
So I was thinking, that one of those low-speed pneumatic drills does around 400 RPM. Maybe I could use one of them. Clean, no brushes, no electricity either. Ought to be enough torque. Maybe put a bleeder valve on there to tune the RPMs... Okay.
Question is, is there any reason I shouldn't do this? Like the sticker on the side that says, OIL DAILY-- well, what if I don't?
There will be a certain radial load on there, by the way-- bag the drill chuck and replace with small belt pulley. Belt tension will be amount of radial load. No idea what sort of bearings those things have.
We can't use motors with brushes (fire hazard, this is in the food industry), but there is plenty of compressed air available.
So I was thinking, that one of those low-speed pneumatic drills does around 400 RPM. Maybe I could use one of them. Clean, no brushes, no electricity either. Ought to be enough torque. Maybe put a bleeder valve on there to tune the RPMs... Okay.
Question is, is there any reason I shouldn't do this? Like the sticker on the side that says, OIL DAILY-- well, what if I don't?
There will be a certain radial load on there, by the way-- bag the drill chuck and replace with small belt pulley. Belt tension will be amount of radial load. No idea what sort of bearings those things have.