deanr@sco.COM (Dean Reece) (09/26/89)
I am looking for a rather unusual item, and I have hopes that some kind netlander(s) can point me to a vendor. I need a rotating interlock. I have a motor spinning something that needs power and a few TTL signals. I can make one of these using P.C.Boards and scavanged switch contacts, but I'm sure I couldn't come close to the quality/liftime of industrial units. The circuits to be sent are Power (+5 VDC & about 5 Amps), 4 TTL signals (serial at about 1 megabit per second) and a sync contact that should generate some constant number of pulses per revolution. Optical sync would be ok, I just need some rough tachometer for the motor. Fortunatly the motor is fairly slow (about 200-500 RPM), and there will be plenty of air flow (this will help keep the contacts cool). Also, this is for use in a fairly gentle environment (i.e. not automotive) so only dust will be a problem. Oh, if it matters, the shaft is about 1/2" diameter and I've got a flat area to mount to as well about 4.5" in diameter, so either a cylinder or disk could be used. One last point of interest, I need to keep the shaft isolated, since it may come in contact with 120VAC, so I can't use that for a high current ground contact (damn!). I know these things exist, but the question is, can I afford to buy one, or can I build one that meets my needs? Any pointers, comments, or ideas are welcome. Is there another solution (perhaps an optical interface for the TTL signals ?) ______________________________________________________________________ | Dean Reece Member Technical Staff |"The flames are all long gone | | The Santa Cruz Operation 408/458-1422 | but the pain lingers on" | |___________deanr@sco.com_______________|___________________Pink_Floyd_|