By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by allandale

small baty bore gauge thread size?????

All Topics | Latest Posts

Search for:  in Thread Title in  
jimmy b14/11/2017 09:51:05
avatar
307 forum posts
15 photos

20171114_094241.jpgI've got a small "Baty" bore gauge, missing a probe. 20171114_094249.jpg

jimmy b14/11/2017 09:55:42
avatar
307 forum posts
15 photos

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
317 forum posts
15 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
avatar
307 forum posts
15 photos
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
1986 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
1986 forum posts
41 photos
Ok thats a bust..it appears pattress screws are 0.6 mm pitch
Mick B114/11/2017 17:17:38
317 forum posts
15 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
avatar
307 forum posts
15 photos
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
718 forum posts
155 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
1052 forum posts

B A perhaps? Unless a special to Baty.

Howard

duncan webster14/11/2017 23:30:44
avatar
1339 forum posts
19 photos

nearest to 3.5 mm OD is 5 BA, but that is 0.59 pitch

jimmy b15/11/2017 06:20:33
avatar
307 forum posts
15 photos
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

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Email News - Join our newsletter

Love Model Engineering? Sign up to our emails for the latest news and special offers!

Support Our Partners
Expo Tools July 14
Eccentric Engineering
Ausee.com.au
TRANSWAVE Converters
SPG Tools October Seventeen
Warco
ChesterUK
Allendale Electronics
emcomachinetools
Shapiro
Sarik
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest

Visit the Model Engineer
Exhibition website

Model Engineer Exhibition