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small baty bore gauge thread size?????

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jimmy b14/11/2017 09:51:05
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210 forum posts
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20171114_094241.jpgI've got a small "Baty" bore gauge, missing a probe. 20171114_094249.jpg

jimmy b14/11/2017 09:55:42
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210 forum posts
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I'm missing one of the probes. I thought i'd make them, but I'm really struggling identifying the thread.

The major is 3.49mm the minor (in the gauge) is 3.29mm and the pitch appears to be about 62 TPI, (.41mm pitch)

I've spent a good while trawling the internet and came up with nothing! the tpi/pitch is a best guess as there are only 2 or 3 threads to measure.

Does anyone have any info on the likely thread?

Thank you

Jim

Mick B114/11/2017 10:17:27
186 forum posts
8 photos

When I worked at Baty in the mid-80s, all bore gauges were subbed out to a company called Knight's, but yours looks as if it pre-dates that. So far as I know they never had any proprietary threads.

M3,5 x 0,35 looks a possible candidate?

jimmy b14/11/2017 10:39:19
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210 forum posts
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Posted by Mick B1 on 14/11/2017 10:17:27:

When I worked at Baty in the mid-80s, all bore gauges were subbed out to a company called Knight's, but yours looks as if it pre-dates that. So far as I know they never had any proprietary threads.

M3,5 x 0,35 looks a possible candidate?

Thanks for that.

Jim

jason udall14/11/2017 17:02:00
1982 forum posts
41 photos
M3.5 as I call them pattres screw ( holds light switch face plate to the square back shell in electric fittings)..
Just a though if you have any about. .to trial fit. .
But from memory those are 0.5 pitch...
jason udall14/11/2017 17:10:05
1982 forum posts
41 photos
Ok thats a bust..it appears pattress screws are 0.6 mm pitch
Mick B114/11/2017 17:17:38
186 forum posts
8 photos
Posted by jason udall on 14/11/2017 17:10:05:
Ok thats a bust..it appears pattress screws are 0.6 mm pitch

That means they're probably standard M3,5 coarse. The 0,35 mm pitch is M3,5 fine.

charadam14/11/2017 18:35:18
144 forum posts
2 photos

Baty appear still to make your depth gauge, or something very similar

Perhaps an email to their tech info line?

https://www.bowersgroup.co.uk/media/wysiwyg/bore_gauges.pdf

jimmy b14/11/2017 20:00:19
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210 forum posts
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I'm going to make some. I think I've worked out the gearbox. Just got to engage leadscrew and turn chuck ten times, to check my calculations.

Jim
Emgee14/11/2017 21:03:56
648 forum posts
151 photos

Hi Jimmy

Checked mine on the magnifier and can confirm thread is M3.5 x .35, total spigot length inc thread is 1.9mm.

Emgee

Howard Lewis14/11/2017 22:23:09
921 forum posts

B A perhaps? Unless a special to Baty.

Howard

duncan webster14/11/2017 23:30:44
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1240 forum posts
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nearest to 3.5 mm OD is 5 BA, but that is 0.59 pitch

jimmy b15/11/2017 06:20:33
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210 forum posts
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Posted by Emgee on 14/11/2017 21:03:56:

Hi Jimmy

Checked mine on the magnifier and can confirm thread is M3.5 x .35, total spigot length inc thread is 1.9mm.

Emgee

Thank you for taking the time to check. It'll be a week before I get chance to try it, but, I will post a follow up.

At present the gauge goes up to about 11mm, I'm planning to make probes that will allow up to about 14mm to give a decent overlap with my "next" size up bore gauge. I figure I'll need 4 more steps.......

Jim

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