White Paper Discuss: Team 33 Four Speed Transmission

[Nuttyman54]

Team 971 is building the transmission for machining practice, and we've found a part in the inventor files that isn't listed in the BOM. It is an extention comming off of gears C and G (highlighted by red arrows in the picture below), and no one on our team can figure out where it's comming from. Also, as indicated in the CAD files, the outer diameter of this "mystery part" is set to 3/5 inches...which is not a very common diameter, to say the least. Any help on this is greatly appreciated
-Nuttyman54 and Team 971

[ChuckDickerson]

It is not an extension. Cut off a 1.375" piece of the 12T spur gear stock and turn the gear teeth off 1" of it. It is one piece. The other gear is bored and fit over the turned down section and welded on.

[lynca]

This link no longer works, would it be possible for someone else to post these files,

[Eric Yahrmatter]

Originally Posted by lynca

This link no longer works, would it be possible for someone else to post these files,

To fix the file, download the file and change the extention from .htm to .doc.

[Aren_Hill]

has anyone reliably shifted this transmission non pneumatically?
out team has developed the habit of never using pneumatics just because of the added weight from putting on tanks and possibly the compressor.
just wondering

also the link to the inventor files doesn't seem to be up anymore

[Lil' Lavery]

Originally Posted by Gear

has anyone reliably shifted this transmission non pneumatically?
out team has developed the habit of never using pneumatics just because of the added weight from putting on tanks and possibly the compressor.
just wondering

also the link to the inventor files doesn't seem to be up anymore

There have been several teams who have used servos to shift, and AndyMark does sell a servo shifting version of their shifter. However, while servo shifters often accomplish the task, many do not perform as well (ie shift as quickly or as reliably) although they are certainly more than functional.
The pneumatics vs. motor debate is an old one, and best saved for another thread, but if you did happen to have pneumatics on your robot, I would suggest using them to shift, but if you didn't it probably wouldn't be worth installing pneumatics just for shifting capabilities.