Does anyone have a good source for a little bit of lathework? I used to use a wonderful retired machinist that Kevin Crisp told me about, but he has health issues so isn't taking any work.
I have dimensioned drawings and access to a lathe but no time and, most importantly, my threading skills are worse than crappy. I can, with a great deal of fussing, turn something like a 1"-8 thread, but never would I be able to do a fine thread like on lenses
They are ill discoverers that think there is no land, when they can see nothing but sea.
-Francis Bacon
What thread do you need?
Part of my camera building hobby is making lens threads.
I have a South Bend 9A with inch and metric gear sets, and tools for 60 degree (USA & metric) and 55 degree (Whitworth).
I have done various threaded adaptors in 6061 aluminum, including the M39 Leica Thread Mount, M42, and some for Ilex shutters.
Provided communication is good, any machine shop can handle this work. But the communication is key.
I have successfully cut a 48 pitch female thread that was something like 1.25" diameter to see whether I will be able to shutter-mount some B&L Protar Vs in shutters. I am too busy to take on additional project at the moment though.
That's a nice hobby to have. Back when I was a grad student and could sneak out of the lab and down to the machine shop and make custom camera parts (mostly odd-format backs for Arca and Toho). But I could never master threading.Originally Posted by wombat2go
This piece is to mount the rear element of a 10-3/4" Goerz Dagor into a Copal 3S shutter. The Copal 3S is M56-0.75, and the Goerz has a major dia. of 2.120 and looks to be about 35 tpi (I can't find my thead gauge). They are both, I'm sure, 60 degree threads.
They are ill discoverers that think there is no land, when they can see nothing but sea.
-Francis Bacon
John:
My 10 3/4" Dagor rear cell is 2.118" with 36 TPI.
Just mounting the rear cell? Is it to go in the rear of the shutter?
Charley
Yes it's just for the rear cell. The gentlemen already turned the adapter for the front cell before his health deteriorated
They are ill discoverers that think there is no land, when they can see nothing but sea.
-Francis Bacon
Clearly there is some variance between samples, my 10 3/4" Dagor rear cell measures 2.129" but with the same 36tpi as Charley found on his. This makes for an adapter with pretty thin walls if the threaded sections overlap. Mines in an Ilex #4, which has a thinner main body than the Copal IIRC.
John,
I can probably help you with this.
PM me and we can discuss.
Henry
Read Sig Line.
Drew Bedo
www.quietlightphoto.com
http://www.artsyhome.com/author/drew-bedo
There are only three types of mounting flanges; too big, too small and wrong thread!
Isn't that the truth!
They are ill discoverers that think there is no land, when they can see nothing but sea.
-Francis Bacon
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