8mm Forum: Bell and Howell worm gear

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Topic: Bell and Howell worm gear

Barry Webb
Film Handler

Posts: 79
From: Cornwall, England.UK
Registered: Jan 2010

posted July 03, 2010 01:40 PM

Hi all this is my first post and first time on a forum.I have been in to this hobby now for about 4 years starting with super 8 and then moving on to 16mm.I have about 6 bell and howells.
My problem is i have one 1695 that has had a new worm gear fitted by someone and it is to tight and the machine jams after a short time can any tell me if this this is a easy fix or a total strip down.
Barry

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted July 03, 2010 02:52 PM

Barry

There were a lot of black nylatron worms which were slightly over size and as they get hot they expand and jam.

It sounds if your installer (unwittingly) used one of these.

Open up the back, is the worm darkish grey in colour? If so, it's a nylatron single piece worm.

I suggest you contact your engineer immediately as it means a complete stripdown. It will either need a new worm or a "turn down" of the OD of the worm, and a corresponding reduction of the bottom of the groove.

Sorry to give you the bad news.

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Maurice

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Richard C Patchett
Master Film Handler

Posts: 424
From: Flint Mi 48506
Registered: Dec 2007

posted July 03, 2010 09:21 PM

Greetings
It may be installed backwards.I have seen this before.
on the 1695 which would cause binding.
RC

--------------------
RC’s Classic Collection
16 mm Parts & Service
Elmo, Eiki, Bell & Howell +
http://www.rcsclassic16mm.com/

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Josef Grassmann
Expert Film Handler

Posts: 190
From: Hennef-Sieg, Germany
Registered: Apr 2005

posted July 08, 2010 08:40 AM

Is there a bit clerance between teeth of worm gear to top and lower gear when warmed up? Is is more difficult to crank it by hand when warmed up?
Otherwise it could be that claw mechanism is tighten too much.

Every time worm gear is changed full service / inspection has to be carried out to ensure that projector runs smoothly.

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