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Small bore gauges

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sean logie25/11/2018 06:41:24
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584 forum posts
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I'm looking to get myself a small bore gauge set .What would you recommend ,the ball type or the flange type .

Sean

Kettrinboy25/11/2018 09:15:27
75 forum posts
39 photos

Sean ive got a 4 piece ball type set and find the two bigger ones that go from about 5mm to 13mm are pretty easy to get the right feel and the measured size with a mic is within about 0.01mm when compared with using a precision plug gauge ,so I use these a lot ,but the two smaller ones that do 3 to 6 mm are a bit more tricky to get the feel of because they spring a bit and getting a definitive mic reading is more difficult so I would still rely on plug gauges to err gauge the exact size of a sub 5mm hole, but as they are relatively cheap I think they are well worth getting.

regards Geoff

Edited By Kettrinboy on 25/11/2018 09:16:43

Rik Shaw25/11/2018 11:02:44
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1310 forum posts
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Sean - These are what I use. The Moore £ Wright gauges in the brown envelope are what I use most. Given the choice though I would use a go - no go plug gauge every time for final sizing (if I had some!).

NOTE for mods. Trying to upload pics to my album now crashes Chrome every time in ver. 70.0.3538.102 and also 70.0.3538.110 both 64-bit. I had to resort to Edge to upload this one. Hope this helps.

Rik

boregauges.jpg

Edited By Rik Shaw on 25/11/2018 11:04:13

Edited By Rik Shaw on 25/11/2018 11:05:38

Hopper25/11/2018 11:59:08
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3657 forum posts
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Ball gauges under half inch. T gauges over half inch. Get the good quality ball gauges because they have better "feel" due to being better made with a more full ball shape. Some of the cheapies have a sort of half-ball which works OK but not as nice for fine measuring.

Fowlers Fury25/11/2018 12:50:42
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323 forum posts
72 photos

Endorse Hopper's comments.....
Some years ago Model Engineer offered a free set of those depicted in the blue plastic wallet above with an annual subscription. They were really rough, no precise feel to them ~ donated to the m.e society's next auction.
Definately recommend making go-no-go gauges to use when bore and gauge at same temperature !

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