MachTach gear tooth sensor mount for 9" South Bend lathe by oldrelic

Last crawled date: 3 years ago

This allows the MachTach gear tooth sensor to be mounted behind the head stock so that the sensor can run against the 76 tooth bull gear. You might need to upgrade an older unit by buying a new microprocessor chip from Henry.
The slot in the back of the base is for a 1/4-20 nut. the hole in the bottom of the base will take a 1-1/2" 1/4-20 bolt which is used to clamp the base to the V-way using the shoe. Clean out the hole with a 1/4" drill bit. Run a 1/4-20 tap through the hole in the top of the base mount. The top piece can be moved so that the attached sensor is positioned close the gear teeth. Then use a short screw to clamp the top piece and hold it in position.
I included a photo of the unit sitting on the v-way in front of the chuck in order to show how it is put together. It is difficult to get a good picture when it is installed in its working position behind the head stock. But you can see it in the working position in the second picture.
I used small wood screws to fasten the sensor mount to the top piece, and thick crazy glue to attach the cover plate. I wanted a cover plate to protect the sensor pcb from oil and stray swarf. You might have to trim the cover plate to get a good fit.
I have included the Sketchup files for those of you who want to change (or fix) things.