Which type do you prefer to use?

Friction thimbles are more accurate in reading the real size of the item.

But, ratchet stops are easier to use and yield more precise (consisten) readings for beginning users.

I'm deciding which type to get.

.: Mitutoyo 103-135 [friction thimble] vs 103-260 [ratchet stop] (0" - 1" micrometer :: accurate to 1/10000th's using a vernier scale)

.: Mitutoyo 103-136 [friction thimble] vs 103-262 [ratchet stop] (1" - 2" micrometer :: accurate to 1/10000th's using a vernier scale)

.: Mitutoyo 103-217 [ratchet stop] (2" - 3" micrometer :: accurate to 1/10000th's using a vernier scale)

Pricing is about the same for either.

http://www.use-enco.com/hotdeals/MeasuringTools.cfm

http://www.use-enco.com/hotdeals/hd0902/44.pdf


[Modified by IN VTEC, 11:20 AM 9/4/2002]

 

I've always used friction thimble mics with no problems. But I guess that really doen't help you compare them much. A bump is the best I can do.....


[Modified by SLPR, 1:43 PM 9/4/2002]

 

FWIW I have both styles. I do not use the ratchet stop even when it is in my hand. Just don't like the feel of it. Friction Thimble is my choice.

Regards,
BigMoose

 

There both good. A Mic of .010" is not super accurate anyways.
Peace
Schu

 

I guess the biggest issue with using micrometers is knowing when to stop.

The best I've heard is that you try to rock the micrometer from side-to-side to make sure you have the surface being measured, parallel to the anvil. I've tried that and my crank main journal reading came out on the small side.

I was hoping that the ratchet stops would help me to gauge when to stop and keep me from being so indecisive as to when to stop and take the reading.

 

It takes a very lite, specific touch. you get it once you've experienced it. Rocking it is a technique, but its not like really rocking, twisting. Practice on calibration stones or anvils and you get the touch.
Peace
Schu