Moore and Wright speed indicator on ebay

[Arsonista]

Does anybody know what this does?. Indicates the speed of what?. How?. Etc. etc.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300354097546&ssPageName=STRK:MEWAX:IT]

 

[scott0031]

Its a rpm counter. I have one here somewhere. Used by sticking it in the end of a shaft or wot not.


Kind regards,


Scott (ward eng)

 

[Arsonista]

Thanks Scott. I wondered if that's what it was. I think I may have a bid on it.

 

[scott0031]

Your welcome.

I have only used the one i have a few times in my life. The one i have works by sticking the end of the counter into a shaft hole. Normally a hole such as a centre drill hole in a shaft. So i think they have to be used at the centre of a shaft for a true reading. I dont think you can use it on like a circumference of a pulley as it wont show a true reading. I think they work on a simple 40:1 worm and wheel drive.


Kind regards,


Scott

 

[Pete.]

Some have a wheel you fit on the end and use simple division maths to work out the RPM. I have a nice one I found in a tunnel once, have used it several times.

 

[wyn]

As Pete says.. if it also comes with a wheel (as well as the cone end) it may have a scale for linear speed ....feet/minute.

We have one in work like that so you can measure the speed of conveyor belts as well as the rpm of shafts..depending which end you fit on.

 

[Paul.]

Here's my hand held tacho, its showing my polisher spindle running at just under 3000 rpm, it also has a wheel attachment, for peripheral or conveyor belt speed, you just hold it on the belt and then read 10% of the indicated value as metres per minute,

 

[Arsonista]

I have a nice one I found in a tunnel once

Eh?.....Care to explain that one Pete?

 

[Shox Dr]

Good bit of kit, I have a digi one a dab of white paint from a paintstick and it will read the rpm off anything

 

[Pete.]

Eh?.....Care to explain that one Pete?

Hehe ok.

Nothing too exciting. I was working under the road in the Queensway Tunnel in Liverpool and I found this little blue box kicking around in the dirt. Turns out it was a hand-held tacho complete with all the adaptors. I think it was used for calibrating the ventilation windspeed-measurement devices fixed to the wall, which were all redundant and smashed. It was a good few years out of calibration but read fine when tested on a 4-pole motor shaft.

The Queensway tunnel (Mersey tunnel) is the largest diameter road tunnel in the UK at 44 feet, and the space below the road is larger than the space above.