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Telescopic bore gauges

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Emgee17/04/2019 13:12:03
1182 forum posts
206 photos

For checking bores for taper or ovality I use these dial calipers, any out of truth can be immediately seen, if you need to know the dimension measure over the legs with a mic or caliper at the reading indicated in the bore, I normally use a digital caliper.
This pair were bought off ebay at very low cost ages ago.

Emgee

calipers 0.5 to 1.75.jpg

mechman4817/04/2019 17:48:13
avatar
2449 forum posts
376 photos

… 'Also, I believe Starrett make a set with 2 sliding bars. Maybe someone could confirm this'?

I have a set; as previously mentioned I have not had any bother using them ...

bore gauge set (1) 8-152mm.jpg

bore gauge set 8-152mm.jpg

George.

Robin Graham18/04/2019 00:16:22
582 forum posts
129 photos

Thanks for replies. The probability of a set of used Starret/Mitutoyo/MW turning up for a fiver in the next week or so is vanishingly small I think, though that would be nice!

I have a set of ARC ball gauges going up to 1/2 inch which, I'm sorry to say, weren't that great as supplied - the cones were rough and sticky, but after some remedial work they're usable. I'll probably take a punt on the ARC telescopic gauges as JasonB has had experience of these particular tools and finds them adequate. I'm not expecting to make eg a sliding fit without fitting, but would like to get nearer to final fit by pure measurement than I can do now.

I'll look at the other styles of gauges recommended as well.

Robin

Geoff~08/10/2019 15:46:51
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31 forum posts

Hi Robin,

What did you end up buying?

I have the same dilemma,

kind regards

Geoff

ega09/10/2019 16:28:24
1262 forum posts
108 photos
Posted by not done it yet on 17/04/2019 09:56:27:

Emgee,

What do you refer to as a ‘digital vernier’? Is it an analogue digital instrument?smiley

This misnomer is unfortunately too well-established to be suppressed.

Nigel McBurney 109/10/2019 18:22:06
avatar
591 forum posts
3 photos

I have a range of telescope gauges,one is by m&w and the rest are mitutoyo,the M&W one has the best feel,I also have a set of M & W small hole gauges using two balls max capacity is half an inch, again it depends on an operators feel and regular use. one advantage with these is that they can be used well down into bore,all can be read with practice to better than a thou , in good conditions ,down to half a thou. During my apprenticeship telescope gauges were always know as "tele " gauges,and used when boring holes for ball races etc ,and you had to get skilled with them ,bosses dont like scrap.My favourite tool for bores is my swiss roche etalon vernier which is a proper vernier and needs an eyeglass to take a reading, A company present when I finished my apprenticeship. this has curved jaws when taking internal measurements, to get a measurement in a bore I set the jaws so that they are a perfect sliding fit in the bore ,lock the jaws,and then measure over the jaws with a micrometer.This allows me to measure the shaft and bore with the same measuring device to achieve more accurate readings for running and press fits. I never use the knife type digital vernier jaws on measuring precision fits.

Howard Lewis09/10/2019 20:25:30
2327 forum posts
2 photos

telescopic gauges need a bit of getting used to, to have a consistent "feel"

Have to admit that I am more confident with a set of M & W ball gauges, or for larger bores a Baty Bore Set. A bit fiddly to set up, but repeatable, which is the name of the game, in my book!

Howard

John Reese09/10/2019 22:08:37
782 forum posts
Posted by mechman48 on 17/04/2019 17:48:13:

… 'Also, I believe Starrett make a set with 2 sliding bars. Maybe someone could confirm this'?

I have a set; as previously mentioned I have not had any bother using them ...

bore gauge set (1) 8-152mm.jpg

bore gauge set 8-152mm.jpg

George.

The set with tapered sliding bars was made by Brown & Sharpe. I have set. Great for checking cylindrical bores. Useless if there is taper.

John Reese09/10/2019 22:11:02
782 forum posts

Buying cheap telescoping gauges is a mistake. Buy the best quality you can find. M&W, Mitu, NSK,...

John Reese09/10/2019 22:11:20
782 forum posts
Posted by mechman48 on 17/04/2019 17:48:13:

… 'Also, I believe Starrett make a set with 2 sliding bars. Maybe someone could confirm this'?

I have a set; as previously mentioned I have not had any bother using them ...

bore gauge set (1) 8-152mm.jpg

bore gauge set 8-152mm.jpg

George.

The set with tapered sliding bars was made by Brown & Sharpe. I have set. Great for checking cylindrical bores. Useless if there is taper.

IanT10/10/2019 09:59:30
1310 forum posts
132 photos

I have the two sets of Arc bore gauges but have only so far used the telescopic ones in anger.

My experience with them is that they do work but can be a bit fiddly. I am sure that part of that was my own lack of experience (and possibly patience) but I was getting a better 'feel' as I progressed. I cannot offer any comparative review because they are the only bore gauges I have ever used.

I think my view would be that they are better than having nothing - and at the price (they are not that expensive) good value for the number of times I really need them - given that as a Hobbyist - I generally make things 'to-fit' (by offering them up) - sometimes making a test gauge for the purpose. But for larger holes it's not always possible to 'offer-up' and I don't always have a lump of stock suitable as a gauge (or don't want to use it for such).

I've found that I can feel a degree of taper (if it's there) with the gauges that might be harder to detect otherwise, although I still use inside calipers occasionally. Measuring a bore further in is better than at the mouth (all you can do with a Vernier gauge) and helps to remind me to take more spring passes if needed - again patience (or lack of it) can be a problem..

So unless some of those nice looking caliper gauges show up at a car boot (at a silly price) - I think for most folk the Arc products may be the only reasonable solution - albeit they are not an essential and somehow I managed to survive many years without them.

Regards,

IanT

Edited By IanT on 10/10/2019 10:02:48

old mart10/10/2019 22:22:01
538 forum posts
43 photos

I have a set of the cheap ones and three old Moore & Wright ones. The M & W get used if they cover the size, and 0.001" is easy to get and repeat. The cheap ones are rough feeling, I should take them apart and smooth them and add a little oil, that might improve their feel.

Anyone who has just bought their first set should practice with some decent holes in materials, to get the feel and repeatability which is possible.

Edited By old mart on 10/10/2019 22:27:20

Mike Poole10/10/2019 23:28:35
avatar
2106 forum posts
51 photos

I see Chronos list them by the mysterious Dasqua, does anyone have experience of this brand?

Mike

not done it yet11/10/2019 08:14:06
3341 forum posts
11 photos

Dasqua Tools appears to be an Italian company. That does not mean, of course, that these items are actually manufactured there.

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