Re: Cirkut Camera Gear Sets, Keys

[Steve Shapiro <sgshiya@xxxxxxxxxxxx>]

The Fulmer-Schwing #8 Curkit Camera I'm about to buy is being sold by a guy
who has a 270mm Schneider G-Clarion lens; and I wanted to know your opinion
and facts about the gear necessary.  The camera comes with a gear set 51, 50
and two 38s.  Why two 38s, I don't have a clue.  So, since the 279 factors
out at 10.58 inches, instead of the eleven those gears were to apply, would
I need another geer, or could one of those work?

What size gear would a 270mm require?

Thanks for your reply.
Steve Shapiro
sgshiya@xxxxxxxxxxxx
'the dude abides'
-----Original Message-----
From: Ron Klein <panorama@xxxxxxxxxxxxx>
To: panorama-l@xxxxxxxxxxxxxxxxx <panorama-l@xxxxxxxxxxxxxxxxx>
Date: Thursday, October 01, 1998 10:56 PM
Subject: Re: Cirkut Camera Gear Sets, Keys


The #5 camera and the #6 camera use 14.5 pressure angle, 48 pitch pinion
gears.  The #6 outfit, #8outfit, #10, and #16 cameras use 14.5 p.a. 32 pitch
pinion gears.  All the cameras use 14.5 p.a. 48 pitch gears in the gear
train.

A quick note about commercially made gears,  I have found that gears made
from even reputable companies sometimes don't work well with the cirkut
camera ring gear.  For some reason the gears are cut with thicker teeth than
the original cirkut gears.  If you examine original cirkut gears closely you
can tell that they are very well made.  I suspect that they have a lapped
finish because they fit really tight when meshed with a ring gear.  With
this logic, I'd probably rule out plastic gears as a solution unless you
know of a way to run them down into a good fit.  Best advice is to stick
with brass gears.

I have been making gears for my cirkut cameras for over ten years.  I use a
lathe to turn the gear blank to the right size and a milling machine with a
dividing head to cut the teeth.   A commercial shop would probably use a
hobbing machine.  This is a dedicated machine for making gears and can
produce a large quantity of gears rather quickly.

If anyone is interested in having gears made, I charge around $35 for a gear
mounted on the correct shaft.  Bigger gears take more time so I charge a
little more.  Believe me, I ain't getting rich making gears.  If you are in
a hurry, I'm probably not the guy to ask as I only do this work in the
winter when the snow is blowing hard.  I do however have a good selection of
gears in stock minus the shafts.  This winter I plan to make a gear lapping
machine so I can produce a really nice polished gear.

Right now it's still picture taking time, but please feel free to ask
questions.

sincerely

Ron Klein