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Topic: crazy motor pull
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Monte L Fullmer
Film God
![](http://www.film-tech.com/ubbmembers/2797c.jpg)
Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 04-30-2006 11:50 PM
That 90 degree twist technique was used by certain mechanics when replacing timing belts in car motors.. for I've done that as well. You'd twist to the 90 degree mark before tension is taken up by the twist. Doesn't matter here on the 'human strength' condition.
You can do this method, for I've done it as well with the P35 belts. But, I rather do the old fashioned way of the quarter-inch deflection between pulleys before the belt begins to tighten...by pressing on top of the belt inbetween any two pulley sprockets. This way, you're right by the adjuster pulley to make the final snug on the allen screw, do the test again, then snug down the remainder of the allens...
With the shutter belt is completely different: you'd pinch the belt right in between the two pulleys and the correct tension is when the teeth of the belt are just barely touching without putting force on the pinching.
You have that "T" handle allen driver on one of the allens of that upper jack shaft assembly ready to be turned to snug that allen when the pinch felt good. Then the other belts come into play - outside first, then inside.
Then, comes the shutter timing to be the last...with the cross being dead center of the aperture opening. Have the shutter loosed on the shutter shaft, with the intermittent sprocket set with the correct number on the tooth as center, have that "T" handle allen on one of the screws of the shutter, swing that shutter to where the cross is dead center to the aperture, then reach around from the front and grab that "T" handle and snug that allen down. Then, you can go around to the back side and tighten both screws down and make your final check.
-monte
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