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Equipment Discussions >> Classic Telescopes

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sgorton99
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Reged: 04/30/08

Loc: Wisconsin, Madison
Re: Unitron 128 mount arrives new [Re: sgorton99]
      #5848848 - 05/08/13 09:55 PM Attachment (10 downloads)

Broken in shipping.

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sgorton99
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Re: Unitron 128 mount arrives new [Re: sgorton99]
      #5848854 - 05/08/13 09:57 PM Attachment (8 downloads)

Rest of stuff in this box. Looks like overall will be fine, if I can find a replacement for the shaft in the previous pic. Will be another clean-up and restore fun project!

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sgorton99
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Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852483 - 05/10/13 06:34 PM Attachment (7 downloads)

Arrived sooner than scheduled.

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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852485 - 05/10/13 06:35 PM Attachment (6 downloads)

Nothing broken...

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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852488 - 05/10/13 06:36 PM Attachment (5 downloads)

Focuser

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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852493 - 05/10/13 06:37 PM Attachment (9 downloads)

Lens, dusty - but should be fine.

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sgorton99
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Loc: Wisconsin, Madison
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852494 - 05/10/13 06:37 PM Attachment (4 downloads)

Lens again.

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starman876
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Reged: 04/28/08

Loc: VA
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852496 - 05/10/13 06:38 PM

Good catch

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sgorton99
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Loc: Wisconsin, Madison
Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852497 - 05/10/13 06:39 PM

It for now. Should end up being a nice little 128. Although I hate to dive in to another project since my 155 is calling...
Steve


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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852501 - 05/10/13 06:40 PM

Thanks - I forgot to mention and probably would be fair, the seller gave me a partial refund because of the broken pieces in the first box.

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starman876
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852508 - 05/10/13 06:45 PM

Considering that shaft is most likely impossible to find I would suggest taking off the knob and having a machine shop make a new shaft. The knob is glued on so you will have to soften up the glue before you can take it off. I do not believe they molded the knob onto the shaft.

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Dave M
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5852688 - 05/10/13 08:24 PM

Very Nice Steve, Congrats!

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terraclarke
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5852744 - 05/10/13 09:12 PM

I agree. It would be an easy matter to machine a new threaded steel rod to the same specifications. It's a later model so should be a standard thread so a die will be available and threads won't have to be cut on the lathe. The "sticky" part (pun intended) will be transferring the knob from the original to the new rod. II am sure you are well up to it Steve considering your fine restoration work so far; it will be a simple task for you. The 128 drives are really nice. Before you know it you will have a lovely 128 next to your gorgeous 155.

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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: terraclarke]
      #5852794 - 05/10/13 09:42 PM

Thanks! Like a Mini-Me for the 155. A fellow astronomy guy from the forums here offered to "fix" my control with a sleeve. He bought some EPs from me, so I will just ship it to him with those and he is going to take a crack at it.

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starman876
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852820 - 05/10/13 09:58 PM

I am not so sure Terra. Steve has a hard time finding screws

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starman876
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5852847 - 05/10/13 10:12 PM

Steve

You could simply just put a thread on the part of the shaft that is left. That should work. If you put a sleeve on it you might run out of threads sooner than you want when using the scope. The mssing inch or so should not make that much difference.


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sgorton99
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5852852 - 05/10/13 10:15 PM

And how would I do that? I don't "do" metal work...

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starman876
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Re: Rest of Unitron 128 arrives new [Re: sgorton99]
      #5852859 - 05/10/13 10:17 PM

all you need is a dye and then put new threads on the shaft.
Looks it up on google. Pretty simple. If you can sand and paint you can use a dye.


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starman876
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5852864 - 05/10/13 10:19 PM

You take the broken threaded part to a auto parts store (not the large chains) and have them match a dye to the threads. Just buy the tool and put new threads on it. IF you ask them nice they will show you.

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terraclarke
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Re: Rest of Unitron 128 arrives new [Re: starman876]
      #5852893 - 05/10/13 10:29 PM

You need to put it on a thread gauge first to determine which die to purchase. You will also need the die wrench. Since its a later Unitron it should be a common thread standard. Once you determine which one you might just want to get a set of taps and dies that includes the wrenches too. Harbor Freight is a good place to shop for one.

Then just put the rod you need to re-work in the vise and the bent end, and cut the rod with a hack saw just above the bend. (Looking at your picture it looks like a clean break so you may be able to skip that step.) File the cut smooth. Put the rod vertically in the vise with the end you want to thread pointing up. Put a little oil on the tip of the rod, and balance the die on the tip in its wrench and slowly begin to rotate it with a tiny bit of downward pressure and you will feel the die bite into the metal. Keep it lubricated with a little oil and slowly rotate,the die until you have as much thread as you need, occasionally backing it off in the opposite direction to clear the filings. It's totally easy Steve. You can do metal.


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