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Post by headcoats on Aug 27, 2022 9:55:08 GMT 1
Is there such a thing !
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Post by cb250g5 on Aug 27, 2022 10:32:25 GMT 1
Verniers are for approximations, if you need accuracy buy a set of micrometers.
I've got external and depth ones, all picked for a few quid each at auto-jumbles or off ebay.
I'd like a set of internal ones, but make do with telescoping bore gauges and my external micrometers.
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Post by tony2stroke on Aug 27, 2022 10:32:32 GMT 1
Cheap ones are reasonable, depends if you use it right too, if you want accurate, get a micrometre, Verner gauges are not that accurate anyway, depends how accurate you need to be.
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Post by tony2stroke on Aug 27, 2022 10:33:00 GMT 1
SNAP!!!!!!!!!!!
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Post by totty79 on Aug 27, 2022 11:16:55 GMT 1
I picked up a set for £1.99 and I'm sure my dodgy eyesight has a bigger impact on accuracy than whatever tolerances they were manufactured to.
I normally use digital ones for this reason.
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Post by headcoats on Aug 27, 2022 11:59:14 GMT 1
I have a micrometer, I had to get one for the shims on the Triumph and just need some reasonably priced verniers
Wonder if there are tests out there where they got a dozen or so verniers to check against each other
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Post by JonW on Aug 27, 2022 13:48:20 GMT 1
Buy cheap, buy twice applies to these sadly. Most cheap digital verniers are just junk. Most fail as they dont make reproducable measurments.
Test them by pushing the caliper together. set the scale to 0. now move the claiper apart and back together in and out a bunch of times. now push them together fully... what does it read? IOf it says 0.000 then its a good one. Most wont do that.
The other tests are for measurement. Find known sized objects, engineers have these in a box, and test the measurement. Again good ones will be bang on or very close.
As has been said, they are good enough for most work, but not for exact measurement.
Ive had a lot of cheap calipers, if you want to measure to the mm they are generally ok, but you need a decent one for real work.
I use a Gedore unit i bought in the 90s, it passed all my testing. It will run its battery out tho, so it needs popping out between uses. Thats sadly another failing of this type of unit...
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Post by headcoats on Aug 27, 2022 15:09:35 GMT 1
Noticed some are made of plastic or even carbon  |
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Post by midlifecrisisrd on Aug 27, 2022 15:14:14 GMT 1
I usually spend a tenner on them
For what I'm doing accuracy to 0.1mm is fine.
I've bought 3
1 metal st started going all over the place
Second metal set still working fine
Plastic set in the shed have been fine as well
Steve
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Post by cb250g5 on Aug 27, 2022 15:21:17 GMT 1
The plastic ones are no good if you do turning on a lathe & pick up the wrong set... the melted jaws were a sight to behold.
If you do want decent quality kit, Mitutoyo are the way to go, but they don't pass the cheapness test.
I do have a set of slip gauges, none of my calipers are accurate to 0.1mm in a repeatable manner. Horses for courses.
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Post by donkeychomp on Aug 27, 2022 21:43:27 GMT 1
I have the £1.99 ones from eBay. First ones got nicked from my workshop on day 1. Bought another, lasted years until it wouldn't turn off and the battery died. Bought another, works well and came with a spare battery too.
Alex
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Post by reedpete on Aug 28, 2022 3:43:57 GMT 1
Hate digital ones, fortunately my eyes can still read the scale on ‘analogue’ mechanical ones.
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Post by badger1 on Aug 28, 2022 7:24:59 GMT 1
Funny how the years change things, Mitutoyo was the cheap option of the engineering places I worked and moore and wright was the ones to have. No digital’s at all in sight.
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Post by rigga on Aug 28, 2022 15:43:45 GMT 1
Aldi in my box , and Lidl currently have some digital ones on the shelf.
I don't need anything expensive or extremely accurate.
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Post by Tobyjugs on Aug 28, 2022 17:51:35 GMT 1
Verniers are for approximations, if you need accuracy buy a set of micrometers. I've got external and depth ones, all picked for a few quid each at auto-jumbles or off ebay. I'd like a set of internal ones, but make do with telescoping bore gauges and my external micrometers. I totally agree with the above. I would buy a second hand gauge as it will still be good enough if it is in reasonable condition. I also use digital, they are good for quickly measuring lots of points that have a larger tolerance. Basically I always look at digital verniers as a lazymans tool or someone who can't be bothered to read the scale. |
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Post by steve63 on Aug 28, 2022 20:02:07 GMT 1
I have some Mitutoyo ones. I think they go to 0.05mm which is near enough for me. I used to have some cheapo ones at work. They're ok for telling the difference between a 6.8mm drill and a 7mm drill and thickness of metal but that's about as far as I would trust them. I wouldn't have kept my good ones at work. I wouldn't like any of the Neanderthals to get hold of them. Horses for courses.
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