Speed Indicator for South Bend 10K Horizontal Drive Lathe

[Elektrishun]

Installed a speed indicator for my lathe after being inspired by several installations I seen online. There are several different ways to go about this depending on the type of lathe you have. The 9 -15VDC speed indicator comes with a digital display, a hall effect sensor, and a magnet.

Determining how to set-up the speed indicator started with where to place the magnet. My main consideration for mounting the magnet and sensor was to not make any permanent alterations to the lathe. I decided to mount the magnet to a piece of UHMW with friction fit at the opposite end of the headstock (tailstock?). I realized that this would interfere with certain applications like using a drawbar with a Morse Taper. So far, I haven't needed to use such a set-up.

The magnet is held to the UHMW using 2 part epoxy and self-fusing repair tape. When using 2 part epoxy with UHMW I used the advice found here; https://www.usplastic.com/knowledge...I1wCXJGEZEYvjz65BlhFMOD1O5Rd1Dth-gme7LL6-GIBk . The epoxy seemed to hold really well but I decided to add the self-fusing repair tape to ensure it stayed in place.

Built a simple metal bracket to hold the sensor (shown in second photo below). The metal bracket is held in place with a single bolt in the location where I believe the drum switch would normally have been mounted.

There is a 120/240VAC - 15VDC power supply powering the speed indicator. The power supply is plugged into a 240VAC outlet controlled by the same switch that provides power to the lathe.

There were numerous ideas that came and went to get the speed indicator installed. I am satisfied with the install and the speed indicator works.

 

[Elektrishun]

 

[Susquatch]

Installed a speed indicator for my lathe after being inspired by several installations I seen online.

Lots of discussion on our own forum about this. Very common thing to want to do.

I recently used two concentric rings of a simple ABS pipe connection (a short piece of pipe and a coupling). Recesses for the magnet(s) are drilled into the outside of the inside ABS ring and glued with cheap RTV so they don't rattle, and then totally captured by the outside ring. This provides a neat way to install magnets that can never go flying across the shop. Magnet polarity is important. The ID of the inside ring is a tight fit to the rear spindle so it can be easily removed if need be. A little contact cement or blue loctite will keep it on if needed. The outside ring can also be turned down to create a smaller gap if needed. I used 4 magnets because this provides better precision. The number is programmed into my Tach and can also be programmed into my DRO.

Enjoy the following thread. Lots more discussion elsewhere on our forum.

Thread 'Installing a digital tachometer' https://canadianhobbymetalworkers.com/threads/installing-a-digital-tachometer.5335/

 

[Elektrishun]

Lots of discussion on our own forum about this. Very common thing to want to do.

I recently used two concentric rings of a simple ABS pipe connection (a short piece of pipe and a coupling). Recesses for the magnet(s) are drilled into the outside of the inside ABS ring and glued with cheap RTV so they don't rattle, and then totally captured by the outside ring. This provides a neat way to install magnets that can never go flying across the shop. Magnet polarity is important. The ID of the inside ring is a tight fit to the rear spindle so it can be easily removed if need be. A little contact cement or blue loctite will keep it on if needed. The outside ring can also be turned down to create a smaller gap if needed. I used 4 magnets because this provides better precision. The number is programmed into my Tach and can also be programmed into my DRO.

Enjoy the following thread. Lots more discussion elsewhere on our forum.

Thread 'Installing a digital tachometer' https://canadianhobbymetalworkers.com/threads/installing-a-digital-tachometer.5335/

Read through the entire thread you provided the link to. Thank-you, it was interesting.

But now I am left wondering - did Dusty ever sort out his technical issues?

 

[Susquatch]

Ask him. If you add an "@" in front of their name, they get a notification.

I'll page @Dusty for you.

If you search on tachometer or rpm, you will find other discussions.

 

[foxey]

I did something similar some years ago. I took a CD disk, milled 60 slots in the edge, mounted it on the back end of the lathe spindle and mounted a slot sensor (LED & phototransistor) to detect the slots. An Arduino Nano counted slots per second, calculated RPM and displayed it. Someday I'll add a few buttons so it can display the cutting speed.
Foxey