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Author
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Topic: Beaulieu 708EL take-up slipping.
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Andrew Woodcock
Film God
Posts: 7477
From: Manchester Uk
Registered: Aug 2012
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posted July 19, 2017 10:01 AM
Alan, you are correct in your assumption there above and please see the following video footage I have recently uploaded for you.
There is nothing in it you won't already be familiar with or indeed nothing you won't already know, but in order for me to explain proceedings properly and before moving on to the detailed drawing of the assembly, it is most important you fully familiarize yourself with this part of the mechanism first.
https://vimeo.com/226160263
This video shows both of the take up and rewind reel arm clutches with the front cover plates removed for both arms.
Notice that at all times the internal drive from the motor, drives completely through all of the internal mechanism of the drive chain through to the hubs in these clutches in both forwards and reverse projection modes.
In other words, both clutch hubs turn constantly in both directions.
The only part of the clutch assemblies that do not drive constantly in either direction are the outer gear hub portion on the clutches.
In forwards projection mode, the rear take up clutch hub and the silver gear hub are both rotating.
The rewind clutch hub also rotates but the silver coloured gear hub directly above does not rotate.
In reverse projection mode, the rewind (front) take up clutch hub and the silver gear hub are both rotating.
The take up (rear) clutch hub also rotates but the silver coloured gear hub directly above it does not rotate.
It is these clutch mechanisms which likely hold the key to your problems I believe, just as Phil earlier has kindly pointed out.
What I suggest you should initially do, is remove both cover plates on your machine and inspect the mechanism several times over in both forwards and reverse projection modes.
It should work CONTINUALLY as the mechanism works in the above video.
If you watch it carefully, you will notice that when switching from forwards to reverse projection mode, there can be seen a slight delay before engaging the outer gear hub into drive mode on some occasions. This is quite normal.
What isn't normal however, is if you observe the drive stalling under any load at times. This is an indication all is not quite how it should be internally with these clutch arrangements.
for you to discover whether or not this is the case with your own machine, you may have to leave the cover plates for the reel arms removed while projecting a few films to simulate what is happening here.
Try to restrict your loaded films to the minimum size you can get away with to experience and recreate the problem so you are able to fully observe the clutch gear hub stalling momentarily with a little luck.
If both centre hubs of these clutches are moving freely in forwards and reverse as I suspect they are, I would advise you to immediately return to the rear clutch tension setting by unscrewing the adjuster collar by the same margin you increased the tension by, by turning in the opposite direction as before.
Take these first steps then please report back your findings.
Once the problem is pinpointed exactly to source of origin, I can post you the drawings here of whichever sub assembly is required to rectify the issue hopefully, if you feel confident you can both dismantle and reassemble the relevant sub assembly correctly with the necessary detailed care and attention these machines require.
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"C'mon Baggy..Get with the beat"
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