pic: Shifting Drivetrain with Transmissions

[Jared]

Here's an updated version with HSMXpress toolpaths: https://drive.google.com/file/d/0Bzf...ew?usp=sharing

Pictures:
https://drive.google.com/folderview?...&usp=sha ring

Free speeds - 15.81 high, 7.38 low
JVN 81% speed loss - 12.81 high, 5.98 low
3.25" versa wheel

The cost for everything (without CIM motors or the pneumatic cylinder) comes out to $730, assuming big aluminum pieces for the frame come for a reasonably priced local place.

[asid61]

Originally Posted by Jared

Here's an updated version with HSMXpress toolpaths: https://drive.google.com/file/d/0Bzf...ew?usp=sharing

Pictures:
https://drive.google.com/folderview?...&usp=sha ring

Free speeds - 15.81 high, 7.38 low
JVN 81% speed loss - 12.81 high, 5.98 low
3.25" versa wheel

The cost for everything (without CIM motors or the pneumatic cylinder) comes out to $730, assuming big aluminum pieces for the frame come for a reasonably priced local place.

Those are some really good speeds for 4 cim. Hope it works out for you if you build it.

[Dunngeon]

Originally Posted by R.C.

For encoders,

A handful of teams (254/1538/973/1323 etc..) have just drilled a hole at the end of the shaft, shove an encoder in there, and zip tie the wiring down.

http://puu.sh/bSXmC/4694259cf2.jpg

I would atleast snap ring the sprocket side and use a bolt/washer on the other side. If you don't have the resources you could always just buy the VersaChassis hex shaft:

http://content.vexrobotics.com/vexpr...awing-Rev2.PDF

Are you saying that 254/1538/973/1323 don't have any kind of retaining system on the interior axle shaft besides the encoder? I've always thought the shafts should be at least snapring or e-clip retained. The picture shows some kind of piece between the encoder and shaft, but I'm not sure what it is.

[R.C.]

Originally Posted by Dunngeon

Are you saying that 254/1538/973/1323 don't have any kind of retaining system on the interior axle shaft besides the encoder? I've always thought the shafts were at least snapring or e-clip retained.

Sorry in the CAD model there is a groove for a snap ring but no snap ring (I get lazy sometimes!). But yes you need a snap ring on both sides of the shaft or snap ring + bolt.