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Author Topic: masking motor speed. Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 11-07-2007 03:38 PM                        I'm trying to use a ACD "Tom Thumb" masking motor to power a top and bottom masking set up for a private screening room. The design will work, but I was wondering if there was a way to slow down the motor so it doesn't whip the masking closed. This thing flies. Any suggestions? Do they make different size cogs to change the speed? Thanks Bernie  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 11-07-2007 05:21 PM                     ADC motors are not known for their variable speeds...particularly the Tom Thumb models...which tend towards their lower end side. Normally the sprocket is rather small and moves side masking at a respectable rate. I can see where T/B masking would be moving a bit brisk...especially in a screening room environment. One thing I like about MDI motors is the ability to set the speed and for T/B I never go above the slowest setting (1). Then again, for sides, I normally don't go above 2. Steve  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 11-07-2007 05:56 PM                     I often put a block and tackle in since the double purchase of the tackle will reduce the load on the motor and slow down the rate of travel  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 11-07-2007 06:56 PM                     The ADC Tom Thumbs ( 4 models ) have an average speed of 5 inch per second of travel. Gordon's suggestion of block and tackle reduction does work if counterbalanced correctly with proper pullies.  |  IP: Logged

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