8mm Forum: Elmo GS1200 Scratch parts

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Topic: Elmo GS1200 Scratch parts

Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted January 17, 2019 04:17 AM

Raised a smile Paul. Isopropanol on cotton bud for sound heads, capstan roller and rubber pinch rollers. You can also still get the leather ended sticks instead of using buds as well.

Its interesting to read everyone's experiences of various projectors. We don't need to run a feature to see if a machine has scratch issues just buy some new clear film, make up a continuous loop, thread it up and let it run 20 times or so. Any scratches made will soon be visible on the projected white image soon enough.

Same thing with sound testing. I use Super 8 fullcoat to carry out stereo test recordings not relying on a striped film where it may been worn or poorly striped. All about maintaining our machines in the end isn't it. Happy days.

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted January 17, 2019 10:26 AM

Hello Paul,

Immediately, I have not any very good drawing to show concerning the Upper Guides modification/conversion.

At this time, I am looking for a drawing software simple and easy to use and which can offer 3D features as well.
When I learned Engineering at school (40 years ago), drawings were hand-made using "Rotrings" with black (or red) ink.

Concerning DLC Anti-friction coating claw itself is not included in the project as claw wearing only depends on the way it works. If general film pull down load can be decreased upon treatment , all the chain claw plus cams will get an increased life :
- Claw plus Cams ==> Increased life*
- Main motor ==> A bit more power available for extras
- Film ==> less wears evidences, less stress for notches
- Main Film frame guides ==> increased life
- Increased smoothness operation

* According to Beaulieu 708 Service guide, the Pull-down spring is rated to 500 gr (This is a lot).
I assume the pull-down spring can be derated up to 250Gr.
Important : Beaulieu Cams are Nylon material and need to be properly lubricated (claw bearing too !!)

Guides to be coated :

NB

Paul, do you have any link(s) about Cubic Zirconia coating ?

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted January 17, 2019 11:23 AM

Hi Phil, this not a coating, its a material fired like a ceramic pot at very high temperatures. It can be machined but you need a machining centre or cnc machine to do this because of the high spindle speed needed for the tungsten carbide cutting burrs. It would be ideal for a fit and forget part, certainly no film medium would wear it out, and you can get a diamond sparkle finish, so les resistance to wear, and its resistant to all liquids that you would use on film. Its main use is sushi kichen knives, I think the Japanese chefs discovered its ideal for this as it does not loose its edge, and I can vouch for that sharpness on a few occasions. Its incredibly stable in high temp situations, so again ideal for a film gate /aperture, where intense heat would affect normal ferrous materials.

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted January 22, 2019 09:56 AM

Hi Paul,

Thanks for these informations. This is something we call also "ceramic" from our side, often used in modern water taps valves too.
If you can take the opportunity to check, there is a high probability Head assembly output film guide (white one) is made of an equivalent material on Elmo GS1200.

Do you think so ?

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted January 22, 2019 10:59 AM

I have purchased some new one's from Leon, and they are plastic, but I have all the dimensions now from the new part, and yes it would be a part you could make from zirconia, and would not look out of place as its the same colour, is it on the list of scratch parts that people miss. I saw a metal version off a scrap gs800 and that was completely warn out, so would have scratched a few films, not mine thankfully. The scrap machines give you quite an insight into what wears out, all good knowledge Phil.......

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted January 22, 2019 12:04 PM

Ah, this is an other chalenge Paul, [Roll Eyes]

Everything around Mag Heads has to be made of neutral material (Non Magnetic). So classical steel is not recommended.
A brass part coated with Hard Chrome, showing a polished finish, could be a good alternative solution.
If there is room enough, introducing a tiny roller could be an other alternative too for this part.

At this time, I am waiting for a PTFE sample band to see how I can use this material for static guides. PTFE is offering the best coefficient of friction under a dry operating condition at this time.

To follow

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Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted January 22, 2019 02:09 PM

Yes Phil, a roller would be good alternative idea there, these guides look like they "steer" the film and keep it locked in the channel, a roller would need maybe a undercut 8mm wide to do the same thing, like on the beaulieu 708, perhaps make one out of zirconia and put some heat shrink over that, this would simply follow the profile, and it would be easy to replace too .....

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