Sound Projector Bolex G3

[Joel Pierre]

I just bought a Bolex G3 projector. It seems to have very little use. It must date from 1950. I disassembled for lubrication (grease and oil). The mechanism seems in good condition.

When I do turn the mechanism with the knob (8), everything seems normal, no special resistance. When I run the motor without driving the mechanism (release mechanism 10), the engine is running quickly without unwanted noise, but when I train the mechanism with the motor, the projector makes a terrible noise, but that is not continuous and systematic.

The noise is sometimes normal, but it does not last. Loud noise comes quickly. It seems that there is something that resonates.

I have two other projectors Bolex (G916 and G16), almost identical mechanically, that does not make all that noise. The projector is “empty” (without film).

What could be causing this noise?



Sound captures :

motor_only.mp3 : http://cjoint.com/13nv/CKkn62JQyF4_motor_only.mp3

motor_and_mechanism.mp3 : http://cjoint.com/13nv/CKkn7B8LWgr_moto ... hanism.mp3

[BAC]

I don't have that projector but I have found that when they make nois it usually comes from one of three places the cooling fan the claw mechanism or the shutter blades. Check if the fan blades or the shutter blades are rubbing on something. There could be something bent in the claw mechanism that will make it hit a part it's not supposed to. Sometimes when they heat up or reach a certain temperature the can warp or expand to a poin where they start to rub on something or stop, that could explain the intermittent nois. You need to try to pinpoint the area where the noise is coming from. Also check for loose parts that may wobble when they are spinning fast.

[Joel Pierre]

The abnormal noise of the projector seems to depend on the speed. It appears from a certain speed and beyond a higher speed, it disappears, and reappear if the speed decreases.