correction - Sorry for the brain fart folks. My mount is the 142 - not the 128 I posted -doh!!!
I just acquired a unitron 142 mount. It is in vg functioning condition, needs a bit of cosmetic love, and some grease and adjusting. That is no big deal to me. I do have some issues and questions about the mount. I hope someone here can help.
First, the saddle or "ring cage" is for an 80mm OD tube. I do not want to use the mount for an 80mm tube. I would much rather have a saddle on it that can take multiple dovetails, or at least rings like parallax makes. The shaft that goes into the current saddle is about 3/4" and is threaded. I haven't actually measured it yet, just an eyeball guess. Does anyone know of a saddle that can mount on here appropriately. I think I could fabricate one if needed.
Second, does anyone know of a place that makes, sell, may have a drive for these old mounts.
And lastly, does anyone have a decent feel for the load capacity on this mount? I am guessing something 12-15lbs if it is a short length ota, maybe under 10 if it is a long focal length refractor. Thoughts?
Thanks for the help!!
Edit: My dream scope on here would be something like a tv 85, or tv101 - thoughts?
Double Edit: I did some searching to find out what the thread is on the counter weight shaft. I found an old archived thread but know definite answers. I have carefully measured and cross referenced to the charts I have. It "appears to be a 12mm course thread, or more specifically, 12 x 1.75 thread. I am going to be at ace later today, I'll see if they have a thread gage or nut to try on this shaft. I'll let you know.
Edited by jcricket, 06 January 2019 - 11:49 AM.