Feast your eyeballs on this:
Mr. Edmund gets a Drive
Posted 14 October 2012 - 12:06 PM
Feast your eyeballs on this:
Posted 14 October 2012 - 12:10 PM
Posted 14 October 2012 - 12:12 PM
Posted 14 October 2012 - 12:17 PM
Posted 14 October 2012 - 12:22 PM
Posted 14 October 2012 - 12:48 PM
Posted 14 October 2012 - 01:04 PM
A very nice setup indeed. What keeps the legs from flying apart though?
The coefficient of static friction on the ground only. I'd get a chain in there.
The RA shaft is short but it should work. The bushing needs to be removed. The RA housing is machined to take the pin assembly and the drive should mount on the exposed shaft after the bushing is removed. Those drives are the same on several different Edmund shaft diameters. They have bushings that adjust for the shaft sizes.
I finally have an original lens on the way to replace the shattered flint in my 57 Edmund 4".
Posted 14 October 2012 - 02:18 PM
I should get a safety chain although the pointed legs do not slip. Those are Astro Optical legs from my 7TE-5. I don't have any original one piece Edmund legs. I am planning on making some.
Here are the missing pieces, the slo-mo lever and the steel ball that retains it:
Posted 14 October 2012 - 02:22 PM
Posted 14 October 2012 - 02:26 PM
Posted 14 October 2012 - 02:29 PM
Posted 14 October 2012 - 02:39 PM
You are ready now for hands free high power tracking. And extended observation at the eye-piece so your brain has time to process what it is seeing.
Posted 14 October 2012 - 02:43 PM
Posted 14 October 2012 - 03:18 PM
Actually I bought one of these 4 inchers back in the 70's and have had a few since.
Now I'm sort of doing a mock-up here with this one, it really needs a full restoration but I assembled it and again refreshing my memory over the superb lens. I've had this one a few years but have not used it at all for a while.
It would be great to see any pictures you might have. I'd like to see an older style drive, before Edmund added the slo-mo lever assy., don't know if you have one like that.
Posted 14 October 2012 - 04:43 PM
I notice that the motor shown doesn't appear to have an oil port in the base to allow for lubricating the gearbox; the reduction gears are the trouble spot on these motors, as the speed reduction needed is so great compared to a 1 rpm, or even 1/10 rpm motor of similar design. If you're interested, there's a CN thread detailing how to go about getting into the gearbox on these old synchronous motors here... properly lubricated, it should last for decades.
Have fun with that fine refractor!
Posted 14 October 2012 - 05:05 PM
This one does not have a lube hole for the gear box. Amazing isn't it we really made some nice stuff didn't we. Almost 1/2 century old and it is as quiet as a church mouse. I didn't even think about all those gears in there.
I need to make a correction. Previous photos show the drive above a tripod leg, that is a error, the drive should be between two legs, thusly:
Posted 14 October 2012 - 07:07 PM
Posted 15 October 2012 - 01:04 AM
This 23mm finder is small but perfect in every way. Beautifully made. Helical focus on the objective end and also focus for the retical.
Posted 15 October 2012 - 01:11 AM
Posted 15 October 2012 - 01:15 AM
Later on Edmund made lenses in-house.
Posted 15 October 2012 - 01:19 AM
Posted 15 October 2012 - 01:28 AM
"We found a Japanese optical engineer who designed some excellent astronomical objectives. We place orders with him. He then has these made, testing each one for quality".