...about micrometers?
Having seen the electronic micrometer owned by Ben (in another thread), I am inclined to purchase one. As a start into that subject, I went shuffling around among the eBay pages.
I'll decide later if I want to buy new, or try a used one, but I have two questions that keep nagging at me.
Micrometer "X" comes with a fitted case, fresh battery, instruction manual, and a spanner. I downloaded the instruction manual from the manufacturer's website, just to learn what I can about the instrument.
Pictures tell me what not to do with the tool.
I shouldn't expose it to temp extremes, pour liquids on it, drop it on the floor, or feed it to my cat.
One picture seems to say I shouldn't touch it, and another appears to warn me against turning the knob (thimble?). (What's up with those?)
Moving on, I am versed in replacing the battery, setting the instrument to 'zero', and translating all (both) of the error codes I am likely to see.
Having absorbed the entire manual, I find my self with two areas of knowledge unfilled, and that brings me back to my 'two questions'.
1. I am not actually told which 'knob' to turn to take a reading. There is a long, fat one...and a short, skinny one on the end of the big one.
The last cautionary picture I mentioned (above) seems to say 'don't turn the big knob' but it may be saying 'don't turn it counter-clockwise'...I am not real sure what it wants me to understand.
2. I have no idea of why this micrometer (and all of the others I looked at) come with a spanner. The manual does not mention it's existence at all, and I already know a coin is an approved tool for opening the battery cover.
The spanner (for this electronic mic) is identical to those supplied with manual instruments, so a guy with experience in using either type should be able to inform me about it's purpose.
That leaves the 'knob question'. Do you turn the big one as a coarse adjustment, then switch to the little one for the final reading?
And, if it is illegal to turn a knob backward (seemingly indicated by the picture), how do you open the anvil faces?
Can somebody mentor me in the use of a micrometer...or should I just stick with my dial caliper?
CM