Brent, I bought one at Edmund Scientific. It's specifications showed that it was one RPM but when I put it under load on the barn door tracker I built, it was one revolution in 63 seconds. I did some calculations and cut the length of the board down (changed the distance from the hinge to the center of the curved threaded rod) which corrected for the error and worked great. I have taken up to 5-minute exposures with good tracking and have taken multiple exposures over as long as 25-minutes and it tracks very well. Thanks Rodger C. Fry -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Brent Watson Sent: Sunday, August 05, 2012 7:01 PM To: Utah Astronomy Subject: [Utah-astronomy] Need a motor I am looking to build a barn door mount and need a 1 rpm motor. Anyone out there have one I could pick up? _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options".