Bridgeport Series 1 MachTach Install
Alex Symington
YUCK!
Head needs a rebuild so this is where I will put the Hall
sensor.
Magnets installed underneath the flywheel
The Back gear operates by moving
the flywheel up and down. The
springs press against the large washer
which sits under the flywheel. The
washer doesn’t rotate with the
flywheel but had nothing to lock it in
place so I added a 1/16 pin (see
arrow)
The Hall Effect sensor is mounted to a
delrin disk Press fit into the washer. I
used clear potting epoxy to keep it in
place and insulate the leads.
A piece of aluminum tubing protects the wires and brings
them safely out the front of the housing
A little bit of JB Weld to hold it in place.
Heat shrink keeps grease out of the tube and
protects the wires.
View from underneath the flywheel.
Wires are looped to reduce stress from moving up and down
I separated the board and connected it with ribbon cable.
As seen, the cable is way too long and was difficult to install
To alleviate this issue, I cut the cables and added
plugs to make installation and removal easier.
Also note I removed the power plug and replaced
the sensor connector with header pins. There was
a clearance issue with the vari-speed chain.
You can also see the slots in the housing I made
to send the wires through so they aren’t visible
when the cover is installed.
Grease Packed and ready to go!
New Front Panel was 3D SLA Printed then Sprayed
with silver Wrinkle paint
Vari-Speed Cover cutout and Painted
Board mounted and covers painted.
Power wire is run to the back of the machine and out a
slot in the belt cover
Finished