pic: 1382 Brazil - Gear box

[Tristan Lall]

Originally Posted by Zanella BR

The gears are made of "polytechmil" (please, help me: I don't know the exact word in English...).

I couldn't find any reference to that material--does it have any other trade names, or do you know the proper scientific/engineering name? (Even in Portuguese!)

For instance, we can get Delrin gears here, but that's just a trade name for a polyacetal thermoplastic, also known as polyoxymethylene (POM).

We'd be able to give you a better idea of the durability of the gears (that is, if you need it), if you could pick the material from one of the lists on eFunda's polymer page or on MatWeb.

The fact that it is dual-speed is nice, but it only amplifies the concerns...I'm interested to see what those other pictures reveal about the shifting mechanism itself.