Digital Calipers May 29, 2012 04:01AM |
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Re: Digital Calipers May 31, 2012 10:58AM |
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Test them out on a few nominally sized items before you go inspecting rocket parts.
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Re: Digital Calipers July 09, 2012 05:38PM |
If you don't have access to measuring standards you have some options. If you have access to a 6" steel rule this is usually a good, cheap item to test out the full measuring scale of 6" calipers. Just measure the full length of the rule. New drill bits work pretty good to test standard sizes IF you know how to measure the TIPS properly. The size of the shank (drill motor end) of a 1/2" drill bit may be .003" smaller than the actual .500" drilling tip measured across the CUTTING EDGE. I put cutting edge in bold letters because you have to rotate the drill until you are actually measuring the maximum diameter of the cutting edge. The shanks of end mills are usually a nominal size (1/4", 3/8", 1/2", etc.) if you have access to them.Quote
fopec: I'm new to using calipers. You said Quote Test them out on a few nominally sized items before you go inspecting rocket parts. Where can 1 find a list of items that are great to test your calipers with?
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Re: Digital Calipers April 13, 2018 04:32PM |
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There are now Chinese counterfeits for most of the reputable brands. The fakes are quite obvious if you've used the real thing, but purchasing online is more of a risk.
Cheap digital calipers perform fairly well, the main inconveniences are that they drain battery quite quickly and use an incremental encoder. The incremental encoder forces you to zero the calipers quite often, and if you move the jaws too quickly they will "slip" and you won't know the readings are bad until you close the jaws and discover it no longer reads zero. Best Front and Rear Dash Cam 2018 - best dash cam for truckers
Higher quality digital calipers (of which Mitutoyo is the most popular) have absolute scales and the battery will last years.
It can seem hard to justify a $140 caliper when the $10 ones also work, but if you are using calipers regularly it makes a big difference. In a machine shop a slightly inaccurate pair of calipers can do thousands of dollars in damage.