Film-Tech Forum ARCHIVE: Horizontal jitter in picture on a Kinoton FP-23

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Topic: Horizontal jitter in picture on a Kinoton FP-23

Mitchell Dvoskin
Phenomenal Film Handler

Posts: 1869
From: West Milford, NJ, USA
Registered: Jan 2001

posted 10-06-2006 09:02 AM

I changed the runners & skate, and re-adjusted the end play. This seems to have solved the problem.

One more question. In my box of spare parts that came with the projector was a metal skate. I have always used the delrin/plastic skate. Is there any advantage/disadvantage to using the metal skate? Do metal runners also exist?

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Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 10-06-2006 09:25 AM

I have several locations that use the metal skate
there is also a melamine type of skate as well
In most lab work they use velvet glued to the steel ones

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Richard Fowler
Film God

Posts: 2392
From: Ft. Lauderdale, FL, USA
Registered: Jun 2001

posted 10-06-2006 11:20 AM

The metal skate is considered a special order due to high cost. Brad seems to prefer them on his PK-60's in service. I have one set on a unit that is in a performing arts center due to the center's on call operators varying in quality and sometimes damaging the delrin type.

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Dave Macaulay
Film God

Posts: 2321
From: Toronto, Canada
Registered: Apr 2001

posted 10-06-2006 01:33 PM

I haven't seen any image quality difference between the emtal and plastic skates, like Gordon says there are folks who swear by velevet strips glued to the skate.
Metal is better where the operators may be unfamiliar with the projector. If you project open gate white light (why?) an open plastic skate melts pretty quickly (depending on lamp power), metal doesn't. If you know the machine you will remove or at least close the skate.

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Michael Schaffer
"Where is the
Boardwalk Hotel?"

Posts: 4143
From: Boston, MA
Registered: Apr 2002

posted 10-06-2006 04:16 PM

I would think that a clumsy operator could do more damage with the metal skate (to the film).
How on earth do you damage the Delrin skate (except for by heat, as Dave mentioned)?
Apart from these aspects, the Delrin parts are much better to the film. The only (technical) reason one might want to use metal parts is when the PK60 is mounted on a hotspotting console such as an SLC. I could imagine they could damage the Delrin parts.
I have seen projectors mounted on SLCs where the hotspotting had caused holes to be burned into the dousers(!).
If you have a good lamphouse with even light distribution, that shouldn't be a problem at all. I have had many projectors with Kinoton lamphouses up to 7k with Delrin parts. No problems at all with heat damage.

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