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Topic: Elmo GS1200 Scratch parts
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Bill Brandenstein
Phenomenal Film Handler
Posts: 1632
From: California
Registered: Aug 2007
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posted December 13, 2018 06:05 PM
I don't have a horse in this race except an ever-aging GS-1200, so this has nothing to do with "taking sides."
Seriously, Leon, your attitude of defensiveness and dismissal just really seems uncalled for. I don't care WHAT Elmo told you when you bought those part in 1999, some of those pieces are used, as proven by the dirt and wear marks on those photos. I would've said the same. YOU are an expert in Elmo's worn parts scratching, and should admit as much that a mistake was made, even if Elmo needs to take the blame.
Thank you for standing by your purchaser and offering an exchange. However, your credibility and honesty is on the line as well for asserting repeatedly that these obviously used parts are new.
Leon, I'm glad you've provided good service to me in the past, but I'd like to hope that might be the case in the future as well.
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Phil Murat
Jedi Master Film Handler
Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015
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posted January 16, 2019 11:47 AM
Hello GS1200 fans,
From my side, this machine is "the machine" to get when a sound transfer has to be done.....
But I don't take the chance to oten play costy features considering green guides melt like "butter under the sun".....
Mines GS shows guide in pretty good condition at this time, but even as new, spurious rubbings are still there.
I prefer to avoid using silicon at this time.
So.... I had not planned to bring work on these machines as I more involved on Beaulieu 708 mainly, but now , I have started to draw something for a future sketch :
- No more "passive" guides to intake film (3 Green guides deleted).
- All Replaced by a single support plate showing 3 or 4 rollers (Brass or Stainless Steel with ball bearings*). Only return spring will be kept.
*Brass could be prefered to Stainless steel in case Stainless steel material is not compatible with magnetic strips vicinity.
- In a first time, "full autoload" function will be sacrified untill primary tests for the new configuration are satisfactory.
- Main plate can be "black anodized" for better appearance.
- Once new plate assembly is operating, a new secondary guide could be designed to restore "full autoload" function.
Film Path Guides , Steel Parts:
These parts on Beaulieu 708 , normaly last a long.
In the aim to reduce cams and claw wears, there is a possibility to apply a coating treatment called DLC (Diamond Like Carbon).
Unfortunately this treatment is very expensive 350 Euros for 4 guides.
But friction will be dramaticaly reduced as friction rate is 0,1 maximum for this coating. No more silicon to use and pull down spring strenght can be lowered to increase cams life.
Of course this treatment could be done on Elmo's steel guides as well....
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Paul Browning
Phenomenal Film Handler
Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011
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posted January 16, 2019 02:55 PM
This sound interesting Phil, do you have photos of these new guides, as for your film claw coating, I would use cubic zirconia, which is artificial diamonds, very very hard wearing, you can machine this in intricate shapes, these could glued in place of the old claw, weighs very little, harder than any material your likely to spray on or find.
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Kevin Clark
Jedi Master Film Handler
Posts: 978
From: Bapchild, Kent, UK
Registered: May 2004
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posted January 16, 2019 06:32 PM
Although they are Mark's observations from his experiences with 16CLs they do not match mine. If a 16CL is properly serviced, which would of course ensure all the rollers are running freely, roller rubbers are sound and not tacky, guides / gates in good condition and other film path adjustments are all correct, then the projector will not scratch films.
On my current 16CLs (and on others I've owned before) I replaced the old rubber roller surfaces (using silicon tubing that costs pennies) re-soldered the dry joints on the larger amplifier board connector (causes low or no sound) and fitted the take up clutch mod (supplied by the superb services of Richard Patchett) along with removing/ cleaning and lubing the rollers and sprocket guide shoes Mark mentions as you would when servicing any make of projector, I have had no problems ever with film marking, loop sizes, or poor running at all.
One concern I have is with the hard plastic film transport rollers that have appeared for sale for the 16CL which I feel could slip on the film and possibly also cause loop size issues as a result - those rollers provide a pinch / braking effect on the film by design and this will only work if the rollers have a rubber (or replacement silicon tubing) surface.
Barry - I can understand your concerns but honestly worldwide there are so many of us that happily use the GS1200 and once modified find there are no scratching problems that it is a non issue these days.
All the groundwork has been done - even if some of the roller / guide mods do need to be carried out by the user rather than purchased off the shelf that is surely part of the challenge and enjoyment of this hobby isn't it? The satisfaction of repairing something ourselves and making it better than the manufacturer ever did? And at a fraction of the cost you mention too.
Kevin.
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