High RPM Tachometer

An incremental encoder could be used. One from the DRS61 range from Erwin Sick can be programmed for 60 pulses per rev. All you need to do is connect a frequency meter (or a DVM with frequency measurement range) for a read-out in rpm.

Alternatively, a toothed wheel with 60 teeth & a magnetic proximity sensor (or slotted disk used as a photo-interrupter) would do the same thing.

Look on ebay you will find plenty of the hand held tacho's available which come with rubber conical ends or with rubber wheels to press on to rotating shafts to measure rpm. They are accurate and last a lifetime without using batteries, because they don't use the modern digital electronics they also are cheap on ebay!!

John.

A 60 tooth gear with a magnetic pickup will give you Hz equivalent to RPM on a frequency counter.

http://www.monarchserver.com was offline Saturday evening (5/17/08).

This reseller's page gives you a look at some of their products.

http://www.directindustry.com/prod/monarch-instrument/portable-tachometer-7418-182526.html

Good luck.

Try a motorbike Tachometer, an instrument maker can make you an attachment to connect to your motor shaft(s), I suggest you fix the outer case in line with the shaft and attach the drive cable by rare earthy magnet + rubber

McMaster Carr has several that will read these speeds.

Avi-tech,

Google Hall Effect transducers.

Or try infra-Red/Laser hand held. Are you in the P-82 repair business?

Wangito.