Buying a Tachometer – Which type Contact or non contact ?

Buying a Tachometer – Which type Contact or non contact ?

This topic has 4 replies, 4 voices, and was last updated 15 November 2021 at 19:00 by Robert Atkinson 2.

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15 November 2021 at 18:26 #571480
Greensands
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@greensands
Hi all – With Christmas coming up I have been thinking about suitable pressies which the family might like to give me for use in the workshop and have started to look at tacho meters but the question arises as to which type to consider – contact or a non-contact. A typical application would be for use with the milling machine but I also have a variable speed topslide drilling spindle to consider. Any pearls of wisdom would be much appreciated.
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15 November 2021 at 18:26 #20500
Greensands
Participant
@greensands
15 November 2021 at 18:32 #571482
JasonB
Moderator
@jasonb
I use a non contact hand held one. also ensures your fingers don't make contact with cutting tools, propellors etc.

For the mill consider wiring one in with a magnetic sensor then you always have the readout and can easily adjust machine to the speed you want
15 November 2021 at 18:57 #571484
HOWARDT
Participant
@howardt
Assume you mean a hand held tachometer to use on different things. A non contact would be best as you cannot always get to the end of a shaft for contact, non contact only needs a small reflector.
15 November 2021 at 19:00 #571487
Robert Atkinson 2
Participant
@robertatkinson2
You can get the best of both worlds with non-contact tachometer and a contact adaptor. This is just a spindle with target a that fits on the tachometer. The main use is with a wheel for surface speed measurement.

e.g. https://uk.rs-online.com/web/p/tachometers/1938688

DIY is possible too. You can buy the difficult bits
https://uk.rs-online.com/web/c/test-measurement/speed-test-measurement/tachometer-accessories/

Robert G8RPI.
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