8mm Forum: Another Eumig problem solved

This is topic Another Eumig problem solved in forum 8mm Forum at 8mm Forum.

To visit this topic, use this URL:
https://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=003557

Posted by David Pannell (Member # 300) on March 21, 2008, 08:10 AM:

There have been from time to time, members mentioning the poor drive system on some Eumig machines. Maybe they might be helped by the following:

The one featured in my recent project was no exception when I received it. However, having roughed up the rubber drive wheel discs, there was little improvement, and it was worse when the hard case was fitted back.

What I found on my machine were 2 things:

First, the motor leads were too thick and not very flexible to allow the motor to pivot easily on its mounting. Also the leads were too short, impeding the action of the spring tension to keep the drive fully engaged.

I cut the leads and joined thinner longer wires, forming flexible loops. See the green wires in the picture below.

Second, I found that when fitting the cast aluminium back, the drive slowed up once more. I discovered that the inside of the case was fouling the white flexible motor mount, by pressing on it and creating excessive friction on the motor pivot. Answer - drill a clearance hole in the case. See picture below.

Problem solved!

Posted by Kevin Faulkner (Member # 6) on March 21, 2008, 09:07 AM:

Is it possible David that the motor mount material may have hardened a bit over the years so that there is not now the flexibility.
When the machines were new maybe it didnt matter if the back touched the mounting providing the material had the give in it.

What model was this with its valve amp?

Kev.

Posted by David Pannell (Member # 300) on March 21, 2008, 09:15 AM:

Sorry, forgot to say. When I originally did the overhaul and service upon first acquiring the projector, I fitted a replacement motor mount, as the original one had indeed gone hard.

On this machine, the cause was definitely wires too thick and too short, and also the case clearance business thing, - even with the mount properly fitted. Poor tolerances, I reckon.

Kev, I just finished the whole project with the longer arms, and it's on the Forum now, - with 8 photos! She is the Mark S, but the standard 8 only, sound machine.

UBB.classic^TM 6.3.1.2