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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details. |
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25th Oct 2021, 7:46 pm | #1 |
Diode
Join Date: Oct 2021
Location: Manchester, UK.
Posts: 2
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Old projector - belt replacement - advice needed please
Old projector- belt has disintegrated so have bought replacement belt but can't work out how to fit it - - there is a shaft running through and need to know which part to release to get the belt on - are there any knowledgeable projector fans out there who may be able to assist please? TIA
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30th Oct 2021, 8:53 am | #2 |
Octode
Join Date: May 2009
Location: Stevenage, Herts. UK.
Posts: 1,518
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Re: Old projector - belt replacement - advice needed please
What is hiding under the plastic to the left of the transformer? Can you take another photo with the plastic lifted up?
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30th Oct 2021, 2:53 pm | #3 |
Diode
Join Date: Oct 2021
Location: Manchester, UK.
Posts: 2
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Re: Old projector - belt replacement - advice needed please
Thanks, I've attached a couple of photos
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30th Oct 2021, 3:43 pm | #4 |
Octode
Join Date: May 2009
Location: Stevenage, Herts. UK.
Posts: 1,518
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Re: Old projector - belt replacement - advice needed please
Ok, looks like a bearing on a bracket so not so easy. Clearly some dismantling will be required to get the belt in, but since I'm unfamiliar with this model I can't give any specific instructions.
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30th Oct 2021, 4:34 pm | #5 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,215
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Re: Old projector - belt replacement - advice needed please
I've repaired a few cine projectors and often fitting a new drive belt is not trivial. I recently did a Bolex Multimatic, and the main drive belt is one of the first things to go in the chassis, before the gate and the very complex loading mechanism.
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30th Oct 2021, 6:10 pm | #6 |
Octode
Join Date: Nov 2011
Location: Manchester, UK.
Posts: 1,875
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Re: Old projector - belt replacement - advice needed please
I don't know if you'd get away with it - but this type of belt:
https://www.ebay.co.uk/itm/292347783...oAAOSwF71hEj2e - which comes in all different cross-sectional diameters, is very elastic and forms very stong joints by cutting a length, and sliding the two ends off two sides of a red hot knife, immediately pushed into each other and carefully held until it sets - a few seconds. Then you carefully trim off the excess. So for this kind of job, you could form the belt on the machine, on the bare shafts and not the pulleys to give you some length to play with - which might save a whole load of dismantling hassle. Not a clear explanation, and not an easy thing to do in close proximity to the machine, but I hope you get the idea!
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30th Oct 2021, 6:49 pm | #7 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,326
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Re: Old projector - belt replacement - advice needed please
It looks like there’s a clutch in the drive and it may have some clearance when moved so there might be enough clearance to get the belt through. I have to admit that most projectors I’ve done did involve some dismantling.
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7th Nov 2021, 7:27 pm | #8 |
Rest in Peace
Join Date: Apr 2008
Location: London, UK.
Posts: 2,508
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Re: Old projector - belt replacement - advice needed please
As above, no specific familiarity with this mech.
If the housing / bracket of the rear mainshaft bearing can be unscrewed from the chassis, then it looks like there is room to work the belt past the other obstructions. Check whether the front bearing is spherical (self-aligning) because if so, it is sometimes possible to swing the shaft slightly away from the chassis without having to remove anything else. Obviously take great care not to bend / force any components of the intermittent. There will probably be an optimum position to which it should be rotated to give maximum freedom. If it hasn't run for a long / unknown time, do make sure all the lubrication is attended to before putting into service. |