8mm Forum: ST1200HD Guide wear

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Topic: ST1200HD Guide wear

Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted November 23, 2003 01:58 PM

Thought I would pass this info on to other ST users on the forum.
I put some new film through my ST1200HD and noticed that it had some light scuff marks on the emulsion side of the film. Fortunately not deep marks. [Mad]

Anyway further investigation found that the guide which goes round to and under the last sprocket had worn flat just where the film enters into the last sprocket.
The profile of the guide should be concave all the way from the top of the guide right down and through the last sprocket.
I got Tony Milman to check his ST1200HD and he found the same as a picture he sent me shows. I have reshaped my guide using wet and dry paper and it now runs without any marks at all.
Elmo's test in their service manuals is a length of new film spliced in a loop and then run round the machine 10 times to check for scratches. Mine now passes that test. [Smile]

The point about this particular area is that scratching caused by this guide will not be noticed until the film is subsequently shown.
I can email the picture Tony sent me with the area marked if anyone wishes to check their machines.

Kevin

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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Jim Schrader
Phenomenal Film Handler

Posts: 1628
From: Savage, MN, USA
Registered: Jun 2003

posted November 24, 2003 07:00 AM

hi kevin can you email me the picture mine has not been scratching my films but if it ever does thanks
schraderj@hearthnhome.com
thanks kevin

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jim schrader
"Let's see “do I have that title already?"

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Richard Clark
Junior
Posts: 27
From: london
Registered: Jun 2003

posted November 24, 2003 03:03 PM

Hi Kevin if you could email me a picture that would be good as I can check mine too
richardclark201@btinternet.com

Thanks Kevin..

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Tony Milman
Phenomenal Film Handler

Posts: 1336
From: United Kingdom
Registered: Jun 2003

posted November 24, 2003 03:14 PM

Interestingly, I ran a loop test without modifying the guide. On the b/w silen film that I ran I have no obvious marking of the emulsion side but there were some very very light marks on the base side. Nothing that projects as a scratch but certainly some light wear. Not sure where it is coming from and I have no idea if a certain amount of wear like this is inevitable.
Tony [Confused]

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Tony

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