Thread: Van Door Worm Gear
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Unread 04-12-2003, 07:47
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Re: Van Door Worm Gear
Jim,

I believe you will not have a problem with the plastic gear that drives the worm gear. We used these on our robot in 2000 and 2001 under constant heavy load (including shock loads) and never encountered any problems. Keep in mind that the engineers who designed this accounted for its strength characteristics under the max stall loads. So, unless your application will require some excessive shock loads, you should be OK.

I just thought of another potential problem with some plastics. They have a glass transition temperature (GTT) not to far below freezing. This means that they become brittle and will crack under minor shock loads when used in very cold environments. Some cast metals also behave this way. I know from experience that cast zinc start to become brittle at about 20 deg F.

Hope this helps.

Raul
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Warning: this reply is just an approximation of what I meant to convey - engineers cannot possibly use just written words to express what they are thinking.