Method to direct drive HEX Shaft

[philso]

Originally Posted by Chris is me

If you have the hex shaft supported in some other way, a quick and dirty solution for protoyping purposes is to drill an 8mm hole in the end of the hex shaft and drop a set screw in it. For competition use, set screws should generally be avoided since they are not great at transmitting torque and tend to come loose exactly when you don't want them to.

The WCP or AndyMark hex adapters combined with Vex's hex coupler is another good way to do it, but again, a well supported hex shaft is essential to any solution.

Never had a set screw come loose in competition and mess us up. Never!!!
Have never used sets screws again for "high power" applications.

For prototyping, you can use a hand drill with a 1/2" chuck to drive the hex shaft. Much less to build.