8mm Forum: Pathe Gem

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Topic: Pathe Gem

Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted September 05, 2015 03:46 AM

I have a 9.5 Pathe Gem which works ok but the motor "hunts", that is to say the speed varies. Does anyone know what governs the speed and how to adjust/cure this problem so that the speed remains constant?

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Mike Shaw
Junior
Posts: 26
From: Canberra, Australia
Registered: Jan 2015

posted September 08, 2015 06:10 PM

There's no adjustment for this Terry but if the machine as been laying idle for some time you'll find the original belt as gone hard and is out of shape...so replace....also if motor mounts are weak this can course problem....If belt the problem you will find original belt made out of fan belt material replace with 'O' ring of right size or else will pull motor mounts towards shutter.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted September 09, 2015 02:17 AM

Thanks for that info Mike. I will have a look at that.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted September 14, 2015 01:34 AM

Well it seems the belt is not the problem. The motors acts in the same way even without a belt. It seems to be a motor fault. Are there brushes on the Gem motor?

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Vic Newey
Film Handler

Posts: 41
From: Worcestershire, England
Registered: Dec 2015

posted December 27, 2015 08:40 AM

Did you find the fault eventually ?, I have a similar problem which I think is related to the speed resistance windings. Speed on mine only worked when the lever was far to the left but the motor kept slowing & speeding up again and I've just unwound mine and found it's broken in several places so presumably it's causing fluctuations in the voltage going to the motor.
I'm now looking for details of the correct wire to get to replace it as it's a simple job that just requires patience to get the windings tightly together.

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Terry Sills
Phenomenal Film Handler

Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012

posted December 28, 2015 02:40 AM

Vic
No I didn't investigate further but what you describe sounds very feasible and is most likely the problem with mine. I will have to get round to it sometime soon. I have been very fortunate to obtain another Gem that came with the original box and instructions- very unusual to find in such good condition- and good working order too. I think I have some resistance wire somewhere that might be suitable for the job. Does it have to be exactly the same spec as the original?

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Vic Newey
Film Handler

Posts: 41
From: Worcestershire, England
Registered: Dec 2015

posted January 01, 2016 08:54 AM

Thanks for the reply Terry,

I would think the wire has to be very similar guage, I carefully rewound mine with some heavier guge wire that I had in the shed & although it runs o.k the speed won't alter & stays constant, I've ordered a spool of resistance wire off Ebay, I found a mention of the correct guage on this forum & the wire on order is about right so I will post an update when it arrives.

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