Toughbox Hex Shaft With Magnet

[Nick Lawrence]

Originally Posted by zbross

I hope everyone's off to a good start to the season! My students are currently working on mounting wheels to their gearboxes using the Long 1/2" Hex Output Shaft with Magnet for Toughbox Series Gearboxes. Problem is, the magnet in the end is too long to use with the SRX Mag Encoder.

With it inserted into the gearbox correctly, the end sticks out about 7mm past the encoder mount pad. Given that the mag encoder requires that the magnet be between 0.75 and 1.5mm away from the end of the encoder, we're at a bit of a loss. Is the only option to use some spacers before the pad so that the encoder sticks way out? Or should we just say forget it, cut the end off, and install our own magnet?

Thanks!

Hi there!

I'm sorry that this hasn't gone together as planned for you. We're currently working on a couple hardware kits (one for encoder mount pad-based gearboxes, one for molded gearboxes) that help relocate the encoder mount points that the SRX Mag Encoder require. These aren't quite ready yet, as we're slowly converting all of our shafts to have this magnet embedded in them. In the meantime, I recommend either purchasing (or making your own equivalent,) spacer from www.aluminumspacers.com, part number #MAS8-5-7. I would also pick up some #10 shim washers from a hardware store, as the magnet placement in the shaft has an approximately 0.025" range of where it seats. The shim washers would let you fine-tune the placement of the encoder. You can check this by looking at the indicator lights inside the SRX mag encoder; it should be green if the encoder and magnet are the correct distance from eachother.

A quick note for all; please do not attempt to machine this magnet or attempt to remove it. It is a tight press fit, and clamping down on it with something like vise grips will result in magnet fragments everywhere.

Sincerely,
Nick