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Cheap lathe tachometer

naxie

Registered
Joined
May 3, 2013
Posts
397
Location
Plymouth, Devon
A little mod I did to my lathe today that I thought might be of interest to someone.

I called in to Halfords this morning and picked up one of these Halfords | Halfords Value 5 Function Cycle Computer

With a rare earth magnet on my lathe spindle and careful mounting of the sensor and routing of cable I now have a digital tachometer and a handy clock on my lathe!

:thumbs:

photo-10.JPG

photo-11.JPG

You need to set the wheel circumference on the speedo to 268mm if it reads in mph or 167mm if it reads in kph. The figure in the readout, 10.0mph is 1000rpm, 2.0mph would be 200rpm etc.

An easy and useful mod for less than a tenner! :thumbs:
 

wm460

Grand Master
Joined
Mar 16, 2013
Posts
23,095
Location
Tennant Creek, Northern Territory, Australia.
First Name
Mark
Looks like a great idea Naxie, Just wondering the rare earth magnet attached to your lathe spindle has a cable coming out of it. When you turn you lathe on the cable will wrap its self around the spindle. Am I missing some thing? :thinks:
 

clumsysod

GOBBY GIT
Graduate Member
Joined
Apr 7, 2013
Posts
687
Location
Grantham
the block with the wire is the receiver static in position, the magnet on the shaft being the signal sender to the display unit.
as it would be on my bike receiver on the forks sender on the wheel and display at the handlebars.
Hope that explains it Mark.
 
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