8mm Forum: Elmo GS 1200: Problem with take-up reel

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Posted by Rene Ruppert (Member # 5392) on August 18, 2019, 05:18 AM:

Hello everyone,

since yesterday I’m a lucky owner of an Elmo GS 1200. The machine runs very good with one exception: The reel on the take-up arm has problems to roll up the film as the reel does not turn smoothly as soon as the film is taken up by the reel. It seems that the reel holder lacks power, but it can turn a full 1200ft. reel. The problem only turns up when the film is threaded.
The belt in the arm and the gear inside the projector seem to be o.k. I’ve read in this forum that this problem may be related to the brushes in the motor or to the main relays. In this case I’m out and the machine needs an expert. Does anyone have an idea what can cause the “stuttering” of the reel? Otherwise I will a visit to a professional workshop.

Posted by Paul Browning (Member # 2715) on August 18, 2019, 05:53 AM:

Hi Rene, The gs has a small helical gear at the base of the arm for takeup, just check this has not split. This will need you to take the back off ( disconnect from the mains supply first) and look to the base of the arm, turn slowly and check that small gear attached in the train of gears, these are known to split so the space between teeth becomes wider in one place, this may be your problem. I had some made from brass, I have some spares if you need one.

Posted by Rene Ruppert (Member # 5392) on August 18, 2019, 06:06 AM:

Hi Paul,
Thank you for the tip! I'll check this.

Update:
It is very difficult to see this gear without removing the motor unit (I tried, but it's stuck between other parts). I tried a dental mirror and the gear seemed to be fine, but I cannot say for sure. Is there another way to check the helical gear?

When I tested the projector yesterday the take-up reel didn't turn at all first. It has gotten better, probably the machine has not been used for a long time.

[ August 18, 2019, 08:06 AM: Message edited by: Rene Ruppert ]

Posted by Paul Browning (Member # 2715) on August 18, 2019, 08:27 AM:

Hi Rene, Its a bit tricky getting it out, but be careful not to loose the screws inside the machine, its a maze, and they get lost !!!!!!. Its a common problem on the gs, so its worth checking closely, one small split will make the pitch between teeth wider, so it will have the effect of running a bit odd.

Posted by Leon Norris (Member # 3151) on August 18, 2019, 09:31 AM:

Rene, It could be one of these problems! 1- the motor. 2- the constant voltage control board. 3- gear 1 on the motor. Try check to see what one is the problem! Let me know I have all of these parts in stock! Leon.

Posted by Rene Ruppert (Member # 5392) on August 18, 2019, 09:55 AM:

Thanks, Paul and Leon, you're right: The little gear is broken.

Small cause, big effect (if this is the only problem - you never know). To get a spare part would be great.
Frankly, after removing the motor I'm deperately trying to get it back in its place without removing the transformator. This is hell! [Eek!]

Update: The motor is back where it belongs - good to have the service manual on this board.

Thanks Paul and Leon for your help!

Posted by Leon Norris (Member # 3151) on August 18, 2019, 10:47 AM:

That's good news Rene! Good luck!

Posted by Steven J Kirk (Member # 1135) on August 18, 2019, 01:30 PM:

This is the Van Eck one on eBay:

https://www.ebay.co.uk/itm/ELMO-GS-1200-gear-for-coil-arm-PP-0036-Van-Eck-new/261856566013?hash=item3cf7de1afd:g:0TgAAOSwd7Fb2szm

Posted by Rene Ruppert (Member # 5392) on August 18, 2019, 01:46 PM:

Thank you! Great that these parts are available.

Posted by Leon Norris (Member # 3151) on August 21, 2019, 10:44 AM:

One good thing adout that gear. It takes a lot of abuse! And last for years! The all brass one is the one to get! It will last forever! Elmo called this gear. Gear 1.

Posted by Leon Norris (Member # 3151) on August 22, 2019, 12:40 PM:

These machines are getting old now and there parts are starting to go! Thank god that parts are still available!

Posted by Rene Ruppert (Member # 5392) on August 22, 2019, 01:03 PM:

Leon, I ordered the plastic gear and hope it lasts for many years.
Yes, these machines are getting old now. I know - I'm about the same age. ;-)

Posted by Leon Norris (Member # 3151) on August 22, 2019, 01:07 PM:

Rene, if you have to order again get the all brass one it will last forever!

Posted by Rene Ruppert (Member # 5392) on August 26, 2019, 03:26 PM:

After installing the new gear everything works great.
Thanks again for your great help!

Posted by Leon Norris (Member # 3151) on August 27, 2019, 10:57 AM:

Good luck Rene! Enjoy!

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