Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote: Hi Joe, The Husrt motor looks to be a 'CA' series , which I've used many times. I know you said you looked but I'm pretty sure that there is a data code on the side along with the RPM, voltage and value for the capacitor. For example the date code is usually looks like "1/72" for January 1972 Another clue is the "Black Cat" capacitor. Those were common in the late 1950's thru the 1970's. - Dave
Quote:If the short was outside the motor, the motor itself still may work, so don't give up on that yet. Carefully note how the capacitor and power input is wired before doing anything else. Also note the capacitance and voltage of the starting capacitor - it's probably .47 uF 250V or so, but read the markings.Unfortunately, Hurst lists the CA model as among their discontinued lines. The drawing for the Hurst DA/DB series looks like they have the same mounting pattern as the CA Geared (not Direct Drive), so the 1/2 RPM DB may be a possible replacement (DA is >= 1 RPM, DB is fractional RPM). Be forewarned, though - I had to replace a 4 RPM Model DA from the '60s last year, and those are still available by special order; the new one was identical to the old (except 45 years and one lightning strike newer), but it was not cheap at $180 then and most likely more now! Also, I only see the DA models listed on the table now, so the DB may no longer be available. At any rate, if you can find a used one, either a 1/2 RPM DB or CA may work.
Ed Jones ........... The best data is an interferogram, the best analysis is from an honest optician.
Terry I come from the Land Downunder.....
George You know you're getting on when the equipment you farmed with is showing up as suburban lawn ornaments.
Quote:The motor has to be 1/2 revolution PER HOUR or 12 per day. 1/2 RPM is 720 revolutions per day (1440 minutes = 24 hours). So the worm wheel would have to have 720 teeth and it looks a lot less than that. 1/2 RPH would only require 120 teeth on the worm wheel (1440/ 12 R/day = 120), which is what it looks like.
Quote:Hello Ivano, The 1.5 inch shaft GEM like yours was indeed very common during the 50s through 70s, and other manufactures were Cave, Atlas and Meade. I'm not sure if this is still a valid Email but try Donald Rothman [email@example.com] for Counterweights and the Motor. If you don't have the 6 inch setting circles for the mount, they are easy to make out of wood or plastic. Matter of fact, there's a link down below in MOUNTs for making the dials.
Back from Stellafane, I decided to finally reconnect all the wires and see if the electric motor still works (I worked on other parts of the telescope last week). While I was stripping one end of the white wire from the motor, the other one... slipped out of the motor. I pulled out the cover, two wires are accessible, the one that slipped out (lover hole in the case; it came out from the same hole as the black wire) is not.
1st Caveman Award!Maynard Clark 8" f/8The Horsetrail Cave 12.5" f/7.51975 Cave 8" f/7 Lightweight Deluxe1972 Cave 8" f/4.5 RFT DeluxeCriterion RV-6Logitech HD C615 Webcam for Imaging
AT6RC; C6R; 8" R200SS; 10" SNT; RV6; PST Vixen GP + Starbook-S Warped LXD55 G11 Gemini-1 & DSC Gone! HGM-200 Gemini-2 Orion Starshoot DSCI2; DFK 41AF02 Sky Commander 4 SkyShed POD XL3 14.5" f5 folded Newt Finished. Now in storage. Mount for 14.5" Portable obs on 7ftx16ft utility trailer wi 8ft dome Trailer Plans Approved, Jig Built! http://cleardarksky.com/c/MCAOobMDkey.html