8mm Forum: ST1200HD Guide wear

This is topic ST1200HD Guide wear in forum 8mm Forum at 8mm Forum.

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Posted by Kevin Faulkner (Member # 6) on 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

Posted by Jim Schrader (Member # 9) on 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

Posted by Richard Clark (Member # 63) on 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..

Posted by Tony Milman (Member # 7) on 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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