Worm Gears for Cargo Elevators

"safety being not important"

Where are you based, I want to give it a wide berth!

hehe!! I am where the war is going on!!:)

the worm gear must be designed to hold back pressure in both directions and should be designed by a good engineer.

if you live in india, as i suspect, you guys are famous for building everything with junk parts you have laying around.

The information given is woefully insufficient. You seem to have no understanding of basic engineering.

Why are you telling me this? I have some familiarity with worm gears. In order to be "self-locking" they need a small lead angle, or equivalently, a high ratio. The quality of lubrication matters, also (better lube = less self-locking effect).

You didn't mention any meaningful data, such as motor speed, cable drum diameter, proposed worm gear ratio, desired speed of lift, etc. This is what indicates a lack of engineering knowledge.

The quotation sounds like sales hype rather than good analysis. It might be true, but no one can tell from the limited info given.

I am still learning!!

http://www.gearsolutions.com/article/detail/6198/applications-for-self-locking-gears

"solenoid of the hoist motor was broken and couldn't be repaired or replaced due to unavailability"

For a problem of the solenoid, you must attend to it, It will be much easier to get a new solenoid made to any spec. You should never tinker around with the original design.

You are right but it's hard to get. I am looking for an alternative drive mechanism

such as an self-locking worm gear box.

Please make sure all CR4 readers are standing well back before recommissioning the equipment.

A worm gear motor is not the best solution in this particular application in my opinion.

My advice is to repair or replace the solenoid, even if you also have to replace the associated hoist motor and parts of the electrics to get it all to match and work properly.

If it worked fine before don't try and reinvent it with a different solution that is even more problematic and will likely cost you even more money than just fixing what you have.

safety being not important as the elevator is used mainly for lifting scrap upto 500 kg load, humans staying away from it

Until it breaks down and human intervention is required or it fails when humans are riding it (you did say mainly, and what are the chances it would fail when people are on it - answer is "highly likely"). Remember, safety is always important regardless of likelihood of misuse.

you are principally right but sometimes circumstantially one is forced to

find an alternate solution. Of course people will not ride the elevator or even stay very

near it.

i whole-heartedly disagree. junk yard parts will only result in a repair that is totally unfit for anything but selling the outcome back to the junk yard. i understand poverty, unavailability, ect , but there's line that should'nt be crossed.

personal safety e.g, [ your first post involved passengers] .

just stumbled upon yr comment. FYI I have installed and run complete plants from junkyard stuff n self made equipment. All successfully. Need proof?

obviosly, you're trying to do the repair work the hard and unsafe way. consentrate on the selenoid..

give us all the information available concening the selenoid.,

nothing's unavailable if you know where to look.

there's alot of smart people on this site who can find one if you can supply "ALL" the information on the selenoid..

sorry 4 stepping on a few feet. i should have read the comments first,.