Worm Gear Self Braking
Worm Gear Self Braking
(OP)
I have been finding the anti-backdriving ratios for worm gears posted to be anywhere from 30:1 to 50:1. I want to use a worm gear for a winch but I want a ratio between the input and output to be much lower. Is it possible to have the gearing to be, say, 40:1 and then attach the gear to a larger ouput pulley thus reducing the output ratio and still maintain the anti-backdriving characteristics?
I am trying to come up with an economincal winch design that will be used to manually raise and lower 2-300lbs without having to add clutches or brakes and without having to crank forever on a worm gear.
I am trying to come up with an economincal winch design that will be used to manually raise and lower 2-300lbs without having to add clutches or brakes and without having to crank forever on a worm gear.





RE: Worm Gear Self Braking
RE: Worm Gear Self Braking
RE: Worm Gear Self Braking
Have a look at www.jeamar.com. (Canada?)
We have put four of their hand operated marine CMA1100 (approx $1000 US) winches to work in the field, some modified here with tow line elec. instrument cable and slip ring commutator. The riggers like the auto-bi-directional brake. The unit is sprocket chain drive about 16:1. These units are not beautiful but keep on ticking.
I noticed they also have another line with a worm drive with brake winch.
RE: Worm Gear Self Braking
I have actually spoken with Jeamar on the phone. I am trying to create a custom product and they were not interested in anything except their established product line. I approached them because I liked their apparent quality but I need a custom piece and their winches cost too much for me to use and modify.
RE: Worm Gear Self Braking
Look at their design a winch.
http://www.thern.com/products.php?loc=wghw4k