What's the RPM?

mickyd · Post by **mickyd** » Thu Nov 12, 2009 10:27 pm

heathicus wrote:That measures surface speed, not RPM. Is there a way of converting the surface speed of a cylinder with a known diameter into RPMs? I'm sure there is, but there's a reason my degree is in English, not Math!

Your shooting 0 for 2 tonight bud.

From the ad....
"Digital contact tachometer for measuring rotational and surface speed."

Measures speed from 2.5 to 19,999 RPM
Direct contact reading
Surface speed reading in feet/minute or meters/minute

So how's work been?:D

heathicus · Post by **heathicus** » Thu Nov 12, 2009 10:49 pm

mickyd wrote:Your shooting 0 for 2 tonight bud. From the ad....
"Digital contact tachometer for measuring rotational and surface speed."

Measures speed from 2.5 to 19,999 RPM

Direct contact reading

Surface speed reading in feet/minute or meters/minute

Ok, do I keep going and hope to get something right, or just go ahead and quit now?

mickyd wrote:So how's work been?:D

Oh, I'd love to blame it on work. But this has just been plain old not paying attention...

mickyd · Post by **mickyd** » Fri Nov 13, 2009 2:13 am

heathicus wrote:That measures surface speed, not RPM. Is there a way of converting the surface speed of a cylinder with a known diameter into RPMs? I'm sure there is, but there's a reason my degree is in English, not Math!

surface distance traveled in inches per minute divided by 3.14 times the shaft diameter in inches equals revolutions per minute. Notice no Math symbols.....it's all in English.