Does anyone know the projector belt dimensions for the FUJICASCOPE M33 ?

[Raymarl Tan]

Does anyone know the projector belt dimensions for the FUJICASCOPE M33 ? Mine seems a bit loose. Its easy to measure the thickness is 2mm, but can anyone please tell me the belts diameter? Im planning to try and replace it with an o-ring.

Issue is the projector plays but after a few seconds the film stops feeding, and if i dont turn the lamp off quickly enough, burn. The belt does seem a bit loose, so im hoping that that is the only issue.

[Steve Klare]

Hi Raymarl,

Welcome!

I'm guessing by diameter you mean the distance across the belt if it was laying on the table as a circle

To me this sounds like something you should be able to figure out mathematically.

A) You measure the diameter of each pulley and get the circumferences by multiplying by Pi, and divide each of these two circumferences in half since you only want to go about halfway around each pulley, assuming they are close in size. (This is the belt length in contact with the two pulleys)

B) You measure the distance between the two pulley axles and you double that. (This is the belt length that's between the two pulleys.)

C) You get the maximum circumference of the correct O-Ring by adding the numbers from A) and B)

D) You get the table-top diameter by taking the number in C) and dividing it by Pi.

This would be the maximum diameter of an O-ring that would sit around both pulleys, and it would sit loose on the pulleys. You'd need to choose one sized slightly smaller to give it a slight stretch.

If the pulleys are very different in size, it makes the math slightly more complicated, but these results are at least close.


(Or if this doesn't sound like fun, tie some string tightly where the belt would go, cut the loop, measure the length and divide by Pi!)

[Nantawat Kittiwarakul]

In addition to Steve's reply...
Once the circumference of the belt is known just go to the nearest hardware store, head to the o-ring shelf, then find the nearest size o-ring that match the measured circumference. Shouldn't cost too much $$ for this (not so) "genuine" replacement parts.😁

And if in doubt - just buy the next bigger & smaller size as well.

BTW 2mm thickness seems a bit thin to my feeling. Most of replacement o-ring I used would be around 3-4 mm in thickness.