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Bolex is slowing or comes to stop... why?

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#1 Arthur Sanchez

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Posted 06 October 2017 - 07:43 AM

What causes the camera, Bolex REX5 to slow down?

 

I know it's not always the spring. but what's causing this reaction?

 

thanks for you help...

 

Arthur!


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#2 Dom Jaeger

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Posted 06 October 2017 - 08:56 AM

Well dried up lubricants don't help but also I think sometimes just wear to the gear bushings displaces gears and adds drag that makes the the whole mechanism harder to turn. The spring only has so much energy to drive it and it slows down early. You can clean, relubricate and adjust everything as best you can, even replace the spring, and it still slows down because the mechanism plates need replacing.
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#3 Arthur Sanchez

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Posted 06 October 2017 - 08:12 PM

Thanks Dom...

Which are "the mechanism plates"???

 

Arthur!


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#4 Dom Jaeger

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Posted 06 October 2017 - 08:59 PM

The 2 plates that sandwich and hold all the gears. They have the bronze bearing bushings in them.


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#5 Dom Jaeger

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Posted 06 October 2017 - 09:02 PM

See:

http://cinetinker.bl...isassembly.html


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#6 Arthur Sanchez

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Posted 07 October 2017 - 07:46 AM

wow... very impressive...

OK I know what you are referring to...

I saw in your blog discussions on the shutter... do you have a simple technique to check shutter phase?


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#7 Jean-Louis Seguin

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Posted 07 October 2017 - 11:39 AM

Viewed from the front with the beamsplitter prism swung out, release the camera on "T". The edge of the shutter blade should be positioned 2mm to 3mm above the gate aperture.
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#8 Arthur Sanchez

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Posted 01 November 2017 - 11:44 AM

Dom... Could you please tell me how to adjust/reset the Over-Wind Stop mechanism... I've recently lost 2 cameras I think due to some spring issue... In both cases... while holding in my hands... the spring exploded inside and I could hear it coming unwound.

 

thank you

Arthur!


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#9 Simon Wyss

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Posted 01 November 2017 - 12:25 PM

Could you please tell me how to adjust/reset the Over-Wind Stop mechanism... I've recently lost 2 cameras I think due to some spring issue... In both cases... while holding in my hands... the spring exploded inside and I could hear it coming unwound.

 

When that happens the spring either broke or got unhooked from the stud in the barrel. Maybe, alright—, maybe somebody had tinkered with the camera and removed the spring stop or pretensioned the spring too far. Correct pretensioning of the spring is a tech job in my humble opinion.


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#10 Dom Jaeger

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Posted 01 November 2017 - 05:52 PM

Do you have the relevant Bolex service manual Arthur? The correct procedure for spring wind setting is described, among other important procedures, as well as part numbers if you need to order replacement parts. I really don't think you can properly check or service Bolexes without one.

On older Bolexes the motor had its own limit gearing incorporated, with newer models the limit gears are external and need to be disengaged from the motor so it can be fully wound down before you can separate the mechanism plates. When resetting, the limit is set one motor revolution down from fully wound.
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