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Topic: sankyo stereo 800
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James N. Savage 3
Phenomenal Film Handler
Posts: 1375
From: Washington, DC
Registered: Jul 2003
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posted January 31, 2006 12:33 PM
Hi Andrew-
Yes, I have dealt strictly with Sankyo ST 800's for the past 20 years. One of my current machines did exactly what you described.
Through a very close and long observation, it seemed to me that the gate was too tight. If you will notice, there are two very tiny springs that put the pressure onto the film as it passes through the gate. By experimenting, I found that if I used a very small paper clip, and pulled back on the top spring (pulling towards the lens), a film that was jumping would run almost perfectly. The only draw back is that I would lose the sharp edge focus. Through tinkering with this method, I have been able to bring the focus back, without the jumping.
You will have to tinker with it a bit, but this should solve your problem, at least temporarily.
If this works for you, I will tell you how I rigged mine perminately (sort of).
Good luck!
Nick.
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David Kilderry
Jedi Master Film Handler
Posts: 963
From: Melbourne, Victoria, Australia
Registered: Feb 2006
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posted February 03, 2006 05:31 AM
Hi Andrew,
I bought a Sankyo Sound 501 brand new in 1980. It was a great machine for years and it ran a lot of film as it was my only Super 8 projector at that time. The problem you speak of started to occur with my Sankyo after about 8 years. At first it was only on some prints, but it steadily got worse and soon occurred on almost everything I ran through it.
Upon careful inspection of the gate I could see substantial wear on both the backing plate and pressure plate. At this time also the focus would drift due to the projector vibration as the plastic lens barrel and its gear mesh with the focus knob had developed slop. In short I had worn the projector out. I still have it, but decided it was time to upgrade to a higher performance machine.
I'm sure it has been discussed here many times, but the projectors we use are now mostly past their intended life. Thorough service and maintenance can bring them back as good as new, but it is often easier just to buy another projector due to lack of parts or expertise in repair.
As has been already pointed out, a correctly lubricated print is always best and one too dry or green will often create problems. I also had some success in altering gate tension, but I increased it to steady the picture.
I hope my first post on this forum is of some interest to you Andrew. I have been a member of big brother film-tech since 1999 and did not know this great forum existed until last week!
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