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I am looking for a small gear box that can switch directions without the drive motor changing directions. It does not need to be very big. Basically I would like to make a shuttle that goes back and forth simply by bumping the wall and switching directions. I know I've seen these on toy cars...

I am trying to select a lubricant that will work well for both sealing a pneumatic bore and properly lubricating roller bearings or gib style bearing surfaces. We currently use Magnalube-G and have not been very impressed by it. We have gotten products back with a few million cycles on them...

i am looking for compact shock absorbers for a motorcycle. they must be strong but don't need to travel too much. this is just preliminary research so i do not have any calculations at the moment. i am more just looking for direction or a brand or something like that so i can start to...

Does anyone make a round LCD display around 3" - 4" diameter or something eliptical. anything that kind of shape. where might i find one?

Okay well I know you can reverse polarity and it should turn in reverse. I have been told that modern brushless DC fans will not operate in this fashion. At the moment I am trying to get my hands on one so I can give it a try. Thanks for the response.

I am trying to find a DC fan that I can reverse. I am looking for something about the size of a computer cooking fan 3"-5" square. Preferably a throughput up around 100 cfm but that's negotiable. Thanks for any help.

I am trying to find information on several different CAD file formats. Primarily IGES (wire and surface) and STEP. What I would like to know is what do they stand for and what are the capabilities? I would appreciate any help you can give me. Thanks.