Voigtlander Bergheil Compur thread pitch?

Dan Quan · Nov 10, 2014

I am having some difficulty finding a flange for a 39 x 28 TPI thread on an old Compur shutter. I have an LTM retaining ring and it definitely does not fit the shutter. I have calipered the major thread diameter to 39mm and measured the TPI with a Gage-It hardware gauge.

Perhaps I am not using the correct terminology when googling?

Any help would be greatly appreciated.

Peltigera · Nov 10, 2014

the Leica thread is 26 tpi not 28. The Bergeil pre-dates the Leica camera by quite a long time so is unlikely to use LTM threads.

Dan Quan · Nov 10, 2014

Peltigera said:
the Leica thread is 26 tpi not 28.

Yeah, I need a 28tpi flange. Any ideas?

Peltigera · Nov 10, 2014

Best advice is probably to find a hobbyist engineer who has a good lathe and ask them to make you one.

shutterfinger · Nov 10, 2014

Compur shutters are metric threads. 28tpi is .9mm per thread; 26 tpi is .97 mm per thread.
Standard metric thread pitch is .4,.5, .6, .7, .75, .8, 1.0, 1.25, 1.5 millimeters per thread.

Looking at the Compur service manual from the 50's-60's only 1 shutter uses a 39mm OD mount thread and it is a .8 thread pitch. It is used on a Voigtlander Bessamatic as well as other makes of cameras.

Dan Quan · Nov 10, 2014

Peltigera said:
Best advice is probably to find a hobbyist engineer who has a good lathe and ask them to make you one.

Due to budget constraints that option is strictly last resort.

shutterfinger said:
Compur shutters are metric threads. 28tpi is .9mm per thread; 26 tpi is .97 mm per thread.
Standard metric thread pitch is .4,.5, .6, .7, .75, .8, 1.0, 1.25, 1.5 millimeters per thread.

Thanks, this gives me more info to goole with.

Peltigera · Nov 10, 2014

Dan Quan said:
Due to budget constraints that option is strictly last resort.

You need someone who will see it as a challenge and pay you for being allowed to do the work.

Dan Quan · Nov 10, 2014

Peltigera said:
You need someone who will see it as a challenge and pay you for being allowed to do the work.

YEAH!

Like a photographer!

paul_c5x4 · Nov 10, 2014

shutterfinger;1722494Looking at the Compur service manual from the 50's-60's only 1 shutter uses a 39mm OD mount thread and it is a .8 thread pitch. It is used on a Voigtlander Bessamatic as well as other makes of cameras.[/QUOTE said:
Are you sure ?

http://benoit.suaudeau.perso.neuf.fr/manuels_rep/obturateurs/compur-repair/02-04.html would seem to suggest a Compur #1 shutter uses an M39x0.75 thread - if this is the case, then any Compur/Copal/Prontor #1 ring should fit.

shutterfinger · Nov 11, 2014

Are you sure ?

No. My print version shows 2 Bessamatic with CN-1110-035 as the base shutter with CN-1110-000 as an alternative parts breakdown.
Shutter specs plate 7 shows CN-1110-035 to be a Compur 00 with a M46, 1.0 mount
Shutter specs page 1 shows CN-1110-000 to be a Synchro Compur 00 with a M25, .5 mount.
Shutter specs page 1 shows CN-1110-020 a Synchro Compur 00 with a M39 .8 mount.
Shutter specs page 2 shows CN-1207-000 a Synchro Compur #1 with a M39 .75 mount.

I was rushed earlier by the arrival of a new to me D300 that I had to sign for.

Careful measurement is in order.

paul_c5x4 · Nov 11, 2014

shutterfinger said:
No. My print version shows 2 Bessamatic with CN-1110-035 as the base shutter with CN-1110-000 as an alternative parts breakdown.
Shutter specs plate 7 shows CN-1110-035 to be a Compur 00 with a M46, 1.0 mount
Shutter specs page 1 shows CN-1110-000 to be a Synchro Compur 00 with a M25, .5 mount.
Shutter specs page 1 shows CN-1110-020 a Synchro Compur 00 with a M39 .8 mount.
Shutter specs page 2 shows CN-1207-000 a Synchro Compur #1 with a M39 .75 mount.

Careful measurement is in order.

I suspect you might be reading the drawings incorrectly (unless the drawings I'm looking at are totally wrong).

CN-1110-035 - A quick change bayonet mount, 46.1ø

CN-1110-000 - Threaded mount, M32.5x0.5 (the CN-1110-010 is a #00 with an M25x0.5 mount)

CN-1110-020 - Bayonet mount, 39.8ø

CN-1207-000 - Can't find this one (unless it is a typo for CN-1307-000)

Voigtlander Bergheil Compur thread pitch?

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