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Helicoid install tools, tips or tricks?
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PostPosted: Fri Jun 28, 2019 11:08 am    Post subject: Helicoid install tools, tips or tricks? Reply with quote

So I opened this Nikkor 180/2.8, which was basically a brick.
http://forum.mflenses.com/nikkor-p-180-2-8-focus-stuck-t80666.html

Now I have cleaned and lubricated the inner helicoids, all ok.

But the outer helicoid is 15+ threads and impossible to refit by hand.

I was thinking of some sort of centering axle like used to install car cluthes? Any other tips or tricks?


PostPosted: Fri Jun 28, 2019 11:22 am    Post subject: Reply with quote

Near the bottom of the page in this link are instructions and tips to reassemble the helical for your lens.

https://richardhaw.com/2018/07/01/repair-nikkor-180mm-f-2-8-ed-ai-s/


PostPosted: Sat Jun 29, 2019 7:18 am    Post subject: Reply with quote

Blazer0ne wrote:
Near the bottom of the page in this link are instructions and tips to reassemble the helical for your lens.

https://richardhaw.com/2018/07/01/repair-nikkor-180mm-f-2-8-ed-ai-s/


actually it is this lens and I followed his instructions
https://richardhaw.com/2017/05/21/repair-nikkor-p-c-180mm-f2-8-auto/

but he never showed the assembly process so I doubt he ever got the lens back together either Very Happy


PostPosted: Sat Jun 29, 2019 11:51 am    Post subject: Reply with quote

Sorry about that. Did you also see his separate helicoid guide?

The only tip I can give to re-mating is that sometimes I rotate the helicals backwards until I feel the indent then I go slightly past that point and then stop and start turning the helical the correct way to lock in.

This does not guarantee that you will find the correct location for starting point but it does help with finding the next position on the threads.


PostPosted: Sat Jun 29, 2019 2:11 pm    Post subject: Reply with quote

thanks,

I've assembled some 6+ thread helicoids, but this 15+ is painful, I got it finally together but it just 1 thread wrong and have to it again

need some beer Twisted Evil