8mm Forum: Slippage with a Bolex SP 8 Special

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Topic: Slippage with a Bolex SP 8 Special

Eric Ray
Junior
Posts: 25
From: Winters, TX, USA
Registered: Mar 2012

posted March 30, 2012 10:03 PM

Just received a Bolex SP8 Special projector. However, the rotor is slipping on the rubber disks. I was wondering how the disks should be cleaned. Should I use rubbing alcohol on the rubber disks. The whole motor pivots to the right or left for forward or backward operation.

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Akshay Nanjangud
Jedi Master Film Handler

Posts: 637
From: Dallas, TX
Registered: Nov 2011

posted March 31, 2012 03:42 PM

Eric, a wide shot and a mid shot would help me understand the situation better. I have a similar projector, SP-80, so at least I can try to help.

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Eric Ray
Junior
Posts: 25
From: Winters, TX, USA
Registered: Mar 2012

posted March 31, 2012 09:26 PM

Here is a different shot. I will have to wait until tomorrow to take more pictures. The projector is at the office.

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted March 31, 2012 11:18 PM

Welcome Eric,

This sounds like another case of the classic Eumig slipping disk. If you search through this forum looking for the words "Eumig" and "disk", there are a lot of discussions about what people have done about it. (The Bolex SPs are really Eumig products.)

Some sand 'em to roughen the surface, some clean 'em. Sometimes they start working afterwards, sometimes they don't.

I've been waiting for mine to take a skid for a decade now: so far, so good.

Rubbing alcohol is pretty benign: I'd try it for something like this as a first shot.

This is a very simple, very clever continuously variable transmission, unfortunately when the rubber facing on that drive disk wears they tend to lose traction and grind to a halt.

--------------------
All I ask is a wide screen and a projector to light her by...

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Eric Ray
Junior
Posts: 25
From: Winters, TX, USA
Registered: Mar 2012

posted April 01, 2012 05:43 PM

Using rubbing alcohol seems to have helped. I have watched a couple of films so far. They both projected correctly.

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