8mm Forum: ST1200 Drive wheel adjustment

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Topic: ST1200 Drive wheel adjustment

Mark Todd
Film God

Posts: 3846
From: UK
Registered: Aug 2003

posted November 23, 2018 03:22 AM

Hi my Elmo ST1200 has a slight issue, the drive wheel sits back slightly, not quite on the shutter sometimes.

Can someone please tell me where and what to adjust that drive unit to get it back where it should be please. More on the shutter.

I know it can be a common issue.

Pictures and lots of how please would be good if possible.

I was going to send it to a fixer but my son is going to have a go ? My fingers are a bit arthritic now, plus the peepers are duff too.

Many Thanks Mark.

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frank arnstein
Jedi Master Film Handler

Posts: 534
From: Gold Coast. Australia
Registered: Jan 2005

posted November 27, 2018 07:18 PM

Hi Mark

There should be an extension coil spring hooked to the drive wheel mounting. Its job is to pull the drive wheel hard against the shutter wheel edge when projecting.

Sometimes the spring is missing or sometimes it just may need shortening to increase its pull.

See if your tension spring is still there and doing its job or needs replacing.

dogtor frankarnstein

[Wink]

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Mark Todd
Film God

Posts: 3846
From: UK
Registered: Aug 2003

posted November 28, 2018 03:25 AM

Hi Frank thank you, I meant to post that it turned out just to be a belt, just slipping when in the mood, I couldn`t tell with my old facilities.

Some on the way from the States.

But thank you again.

Best Mark.

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frank arnstein
Jedi Master Film Handler

Posts: 534
From: Gold Coast. Australia
Registered: Jan 2005

posted November 28, 2018 04:27 AM

Hi Mark,

I can understand the motor pulley slipping if the belt is loose but you did also say "the drive wheel sits back slightly, not quite on the shutter sometimes." and "tell me where and what to adjust that drive unit to get it back where it should be".

So how did you conclude that the cause of this issue was just a loose belt, as I have some doubt about this.

You also didn't confirm if the extension spring that I referred to, is still in place on your machine.

dogtor frankarnstein
[Wink]

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Mark Todd
Film God

Posts: 3846
From: UK
Registered: Aug 2003

posted November 28, 2018 04:33 AM

Hi Frank I just thought it was.

My facilities are well below par since the stroke.

The wheel is fine having got my glasses on and a torch etc and had more of a look see. But I still struggle to focus close up.

Its running lovely once away, but waiting for the belts before I use it more.

Theres no rubber on the shutter which is good.

Nicest 1200 I ever had so good its nothing much.

Best Mark.

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