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Originally Posted by Joe Johnson
And don't get me STARTED on efficiency (you flush half to 2 thirds of your power right down the drain -- and that is if you do things right you can waste 90% easily without even trying! But... that is is why they are not backdrivable - so that can be a plus but...)
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It appears the door opener gears probably have better efficiency than most worm gears, because they don't have a very steep ratio, and apparently are backdriveable. The sliding tooth contact is not as efficient as the mostly direct contact of spur gears, so the efficiency must be less, thanks for pointing that out.
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As for me and my house... ...I am thinking this is a job for NBD
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We had some fun with DeWalts our rookie year, and are a bit leary of them. I suppose if you are good at machining an 8mm hole in a pressed metal gear that has a 9mm minor diameter, then can get the gears pressed on the shafts (and have it survive a few regionals) without breaking they are OK, but that shaft to gear coupling problem makes me shy away from them for use with a CIM. A FP driving them should not be so bad.
Thanks for the comments!