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Speed Checking your motor.

That's a great idea about the fibre optic cable. Another thing I do, for peace of mind, is fasten a Tobin Speed Checker box (about $125) to my slate (I added a micro switch to the slate that turns on when the clapper is up, and turns off when the clapper is down, for auto on/off by wiring the switch into the box's battery line). That way I get confirmation that the motor is at speed at the start of each take. It helps me sleep better while the film is in the lab (I ship from LA to Du Art, and it takes a week to get dailies back).

I have a CP motor that has driven many 400 foot mags a day without problem, as long as the battery is fresh. I have a battery for each mag, and always change to a new fully charged battery with every mag change. But admittedly since I live in LA I've never had to worry about cold weather. Mark.

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