I helped a guy in Ogden fix one of the red tube Coulters. I built a mirror cell by cutting out a square piece of 3/4" plywood that would fit inside the tub. I used carriage bolts L brackets, springs, washers and wingnuts to mount the new mirror cell. We also replaced the focuser with the orion 1.25" focuser. We moved the altitude bearings and rebuilt the mount out of 3/4" plywood so that it would be lighter. This also allowed us to have a little more height to get the balance correct after losing all the weight at the rear. I could go over and get some picture if someone wants them. Thanks, David Dunn Software Engineer Sr. SUPERVALU | Salt Lake Hardware Building 155 N. 400 W. 3rd Floor Salt Lake City, Utah 84103 Cell: 801.750.3198 | Home: 801.544.7705 | Office: 801.961.3253 david.dunn@supervalu.com -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Tuesday, February 28, 2012 6:11 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Coulter question In that case it's probably a late model. If he has the budget, go for new optical supports and a focuser all at once. I can supply some Teflon for new bearings at no charge, although the plastic trunions might be sticky too. On Mon, Feb 27, 2012 at 10:21 PM, Richard Tenney <retenney@yahoo.com> wrote:
It's really difficult to adjust the secondary and primary mirrors to achieve collimation (and it was pretty off, testing with my laser). In fact, the primary mirror "cell" is so crude it was impossible to adjust it as far as it needed to be tweaked.
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