Newbie to the forum
Posted 18 September 2013 - 08:15 AM
I'm a draftsman for Harper College in Palatine, Il which has an observatory. I was thinking I might get some help here too.
I appreciate the help.
Posted 18 September 2013 - 04:23 PM
I am not sure about the mount, etc., but you might want to consider turning the optical tube into a Dobsonian. There are some pretty good instructions for making a mount out there. You would just have to modify the plans for your size and focal length. What you have looks like maybe a six inch f/8 scope. That should make a fine planetary rig as well as general purpose scope. A Dobsonian mount that size would be fairly easy to move around and set up.
By the way, welcome to the forum!
Posted 20 September 2013 - 11:10 AM
Posted 07 October 2013 - 05:12 PM
Posted 07 October 2013 - 06:09 PM
Posted 07 October 2013 - 08:43 PM
If you can zoom in on the photo you can see the simple string attached to the pulleys on the forward shaft. I tried it tonight after assembly and the adjustment is fine enough. I will however replace the string with braided stainless cable. We use to use it for fishing on downriggers. It's flexible enough to wrap around the pulleys.
I could figure out the ratio but I know I'm able to move it less than 1/8 degree by hand. I'm going to create a video of the assembly when I'm done. The base adjustment will be capable of 1/8 degree or less.
I'm 61, a retired carpenter (hurt) and landed a job at Harper College as the Physical Plant Draftsman. I had taught myself Autocad over the years so it's easy to design things. I'm cutting the pieces on a cnc router I designed and built. Here's a pic. It makes it a little easier to get precision pieces.
Posted 08 October 2013 - 02:27 PM
Posted 08 October 2013 - 07:08 PM
Posted 09 October 2013 - 06:54 PM
Posted 09 October 2013 - 07:04 PM
Posted 10 October 2013 - 04:21 AM
Posted 10 October 2013 - 04:12 PM
Got home from work and crashed. Won't be able to mount them tonight but here's 2 of the Alt gears. The large one will be mounted to the telescope carriage and the pinion to a 1/2" shaft. 12:260 gear ratio gives me about 16 degrees per turn. At this ratio I can move the scope from horizontal to vertical in a few seconds.
I decided that if I put another set of reducuing gears of 10:80 on a swing arm I can get the gear ration down to 2:360 or 2 degree whcih will give me micro adjustments of 1/16 of a degree or less when needed. The small pinion's hole is .5". for a scale idea.
I know some people think the wood for gears is a bad idea but Baltic Birch is extremely strong. You can't get the teeth to flex at all with your fingers and there probably won't be more than 3 lbs or force against the whole assembly when balanced. And ... when you can cut them yourself you say a fortune.
Posted 11 October 2013 - 09:03 PM
Posted 11 October 2013 - 10:11 PM
Tomorrow I start the RA wheel and mount the base adjuster.
Posted 12 October 2013 - 06:27 AM
Posted 12 October 2013 - 01:16 PM
I bought a .00 digital angle finder that I can zero and will mount it to the carriage for Alt readings.
The auction came with a Meade 1000mm x 90mm lense that I will mount to the top of the carriage for photos.
Pictures never seem to upload in order. Should probably do them one at a time.
Posted 12 October 2013 - 07:30 PM
Posted 12 October 2013 - 08:56 PM
Thanks for the compliments Bill.
Posted 13 October 2013 - 09:01 AM
Posted 13 October 2013 - 11:30 AM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users