Many of us have plenty of spindles and other revolving objects around us - grinder, mill, lathe etc that we'd like to know RPMs of .
Well wonder no more - order one of these:
http://cgi.ebay.com/Digital-Laser-P...oryZ1504QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I got mine for $22 delivered from a different seller (also in HK).
Works 100% . I wasted no time establishing that max RPMs of my Sieg X3 are 3700 (up from 2000 stock RPMs, after replacing motor control).
Clocked my grinder too, for good measure. Here's how: right to the belt, attach a inch wide piece of alum sticky tape and measure away. The device comes with some reflective tape JIC.
For mill and lathe spindles, wrap around a single loop of common black electrical tape, leaving a small gap - half an inch or so. Measure away.
The device takes 3 AA bats and projects a reddish spot to assist in aiming . A+++
Well wonder no more - order one of these:
http://cgi.ebay.com/Digital-Laser-P...oryZ1504QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I got mine for $22 delivered from a different seller (also in HK).
Works 100% . I wasted no time establishing that max RPMs of my Sieg X3 are 3700 (up from 2000 stock RPMs, after replacing motor control).
Clocked my grinder too, for good measure. Here's how: right to the belt, attach a inch wide piece of alum sticky tape and measure away. The device comes with some reflective tape JIC.
For mill and lathe spindles, wrap around a single loop of common black electrical tape, leaving a small gap - half an inch or so. Measure away.
The device takes 3 AA bats and projects a reddish spot to assist in aiming . A+++