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Equipment Discussions >> Classic Telescopes

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starman876
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Reged: 04/28/08

Loc: VA
Re: Rest of Unitron 128 arrives new [Re: terraclarke]
      #5852926 - 05/10/13 10:45 PM

Most important is to make sure the dye stayes square with the rod otherwise you will have a wigly rod when you turn it. There is special thread cutting oil. Ot maybe the local machine shop at the auto parts will be nice and do it for you.

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nightpilot
super member
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Reged: 02/16/12

Loc: Southern Suburbs, Chicago
Re: Rest of Unitron 128 arrives [Re: starman876]
      #5853132 - 05/11/13 01:01 AM

Thats gotta be a tough part to find. Sleeve might work. As has been mentioned you may loose thread. Good advice on making the rod. You may have to do that or have someone make it. Boy other than that it should clean up good. Nice 128. I am a sucker for those black and white setting circles.

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terraclarke
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Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5853355 - 05/11/13 08:14 AM

Quote:

Most important is to make sure the dye stayes square with the rod otherwise you will have a wigly rod when you turn it. There is special thread cutting oil. Ot maybe the local machine shop at the auto parts will be nice and do it for you.




I've always just used plain old 10w30 and it worked fine with hand turned taps and dies.


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sgorton99
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Reged: 04/30/08

Loc: Wisconsin, Madison
Re: Rest of Unitron 128 arrives new [Re: terraclarke]
      #5853371 - 05/11/13 08:34 AM

Wow, a lot of great advice everyone! Having tried a bunch of screws in the hardware store that were not quite the right size, my biggest concern would be finding the correct die size for the sometimes funky Unitron threads. Losing a 1/4 or even 1/2 inch of threading is not critical, you would just have to loosen the lock a do a rough adjustment and not have as much travel with the slo-mo control.

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starman876
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Reged: 04/28/08

Loc: VA
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5853382 - 05/11/13 08:46 AM

IF you take the slow motion control to the store with the broken part they can see what trhead size it is and provide the proper dye. Or just find a machine shop in your area and bring some flowers with you. Now you need to know, around here they charge $100 an hour. The reason I bought a set of taps and dye and many other tools. Even a mini mill from harbor freight. I do not know if you live in an area that deserves a harbor freight. For years there was not one in the DC area. THe closest was in NJ. But if you like to tinker that is a great place. While you are there pick up some of those maple work tables. They are a joy for $120.

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sgorton99
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Reged: 04/30/08

Loc: Wisconsin, Madison
Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5853401 - 05/11/13 09:02 AM Attachment (7 downloads)

Here is a good example of the thread size issue. The complete control is from my 114, looks the same - right? Nope, does not work.

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Mirzam
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Reged: 04/01/08

Loc: Lovettsville, VA
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5853423 - 05/11/13 09:24 AM

To a trained eye that is obviously a coarser thread on the broken control. If you could find a coupler the right size for the rod diameter, you could make a flat spot on the two pieces and hold them together (after cutting off the bent section). Here is what I am talking about:

McMaster-Carr shaft couplers

JimC


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starman876
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Reged: 04/28/08

Loc: VA
Re: Rest of Unitron 128 arrives new [Re: Mirzam]
      #5853452 - 05/11/13 09:44 AM

Just take it to the parts store and see if a dye matches up. Simple take the threaded part and see if it will screw into the dye easily. If it does you have the right dye.

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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5853479 - 05/11/13 09:58 AM Attachment (7 downloads)

Well, found another solution. I received a very rough 140 mount with the tripod I bought for this. Because of some damage to it, I decided not to sell it whole, but maybe for some parts that someone may need. Anyway, the part(?) the shaft screws in to fits on the 128 mount. Seems to be a good solution.

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terraclarke
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Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5853484 - 05/11/13 10:01 AM

That looks to be the perfect solution. Good for you Steve.

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starman876
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Reged: 04/28/08

Loc: VA
Re: Rest of Unitron 128 arrives new [Re: terraclarke]
      #5853503 - 05/11/13 10:13 AM

And I forgot to mention you can remove the nut that the control screws into and screw it into another mount if the threads do not match between the mounts. However, you found the perfect solution. Nice work Steve. Now to get you some screws for your other project.

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sgorton99
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Reged: 04/30/08

Loc: Wisconsin, Madison
Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5853555 - 05/11/13 10:53 AM

Thanks - that is basically what I did. Removed the nut from the damaged 140 and replaced the nut on the 128. Then, the good shaft from the 140 fits in the "new" nut on the 128.

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nightpilot
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Reged: 02/16/12

Loc: Southern Suburbs, Chicago
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5853633 - 05/11/13 11:43 AM

That will work.

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nightpilot
super member
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Reged: 02/16/12

Loc: Southern Suburbs, Chicago
Re: Rest of Unitron 128 arrives new [Re: nightpilot]
      #5853649 - 05/11/13 11:53 AM

You can always continue to look for a longer term solution (if thats what you want to do long term).

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sgorton99
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Reged: 04/30/08

Loc: Wisconsin, Madison
128 and 155 mounts new [Re: nightpilot]
      #5854125 - 05/11/13 04:56 PM Attachment (12 downloads)

My 155 project is going so fast it is fun to have this second 128 project at the same time!

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starman876
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Reged: 04/28/08

Loc: VA
Re: 128 and 155 mounts new [Re: sgorton99]
      #5854198 - 05/11/13 05:56 PM

Awesome Duo Steve. Great work.

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sgorton99
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Reged: 04/30/08

Loc: Wisconsin, Madison
128 assembled new [Re: starman876]
      #5854476 - 05/11/13 10:14 PM Attachment (7 downloads)

I'll try and do a less cluttered outside shot tomorrow, but here is a pic all together. Thank-you everyone for your assistance and comments!

Steve


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gelkin
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Reged: 09/22/10

Loc: Western, MD.
Re: 128 assembled new [Re: sgorton99]
      #5854971 - 05/12/13 08:19 AM

Looks like you did good Steve. Love those 128 mounts, beautiful.

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terraclarke
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Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: 128 assembled new [Re: gelkin]
      #5855177 - 05/12/13 10:41 AM

Awesome! The Dynamic Duo!

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Mirzam
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Reged: 04/01/08

Loc: Lovettsville, VA
Re: 128 assembled new [Re: terraclarke]
      #5855214 - 05/12/13 11:00 AM

Holy equatorial Batman!

JimC


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