Measuring Tolerances

[Alfie PeacockParticipant @alfiepeacock58331]

Thr ting wit de speing is a mis wid de ke dord ,mate.

[SillyOldDufferModerator @sillyoldduffer]

Posted by Alfie Peacock on 03/11/2017 17:32:28:

How many micrometres have been made in the UK since 1904 .

Dunno!

But why 1904? I'm not convinced that any of the ordinary 'micrometers' made in the UK before M&W started production in the mid-1920s qualify as precision instruments . Accurate micrometers as we have them today were developed in the USA about 1890 and the UK was late in the field. I believe Moore and Wright were subsidised by the government to make precision micrometers, and they got the technology by buying out a Swiss company.

Dave

[HopperParticipant @hopper]

Posted by Alfie Peacock on 03/11/2017 17:32:28:

How many micrometres have been made in the UK since 1904 .

Take the number of metres made and multiply by 1 million.

[Jeff DaymanParticipant @jeffdayman43397]

I's sure I read somewhere that before Moore & Wright got good at making micrometers they were called Moore and Wrong. In any case, before micrometers they were certainly more wrong than Wright.

(now taking cover)

[WatfordParticipant @watford]

We don't want any Moore of that.

[Michael BriggsParticipant @michaelbriggs82422]

Genuine Moore and Wrong:

[Mick B1Participant @mickb1]

Posted by Neil Wyatt on 03/11/2017 13:40:30:

Ahem, let's assume that someone signing themselves 'Absolute Beginner' is unlikely to be familiar with meanings of all the terms we use and help them learn.

There are no daft questions if you don't know the answers.

Neil

Of course, but it is legitimate to ask the OP for clarification where their terminology is ambiguous.

Otherwise the only genuine reply is silence, and what good would that do?

[Neil WyattModerator @neilwyatt]

Posted by Mick B1 on 04/11/2017 09:58:21:

Posted by Neil Wyatt on 03/11/2017 13:40:30:

Ahem, let's assume that someone signing themselves 'Absolute Beginner' is unlikely to be familiar with meanings of all the terms we use and help them learn.

There are no daft questions if you don't know the answers.

Neil

Of course, but it is legitimate to ask the OP for clarification where their terminology is ambiguous.

Otherwise the only genuine reply is silence, and what good would that do?

Asking for clarification is fine, but some posts were getting near mocking the OP.

Neil

[Ian S CParticipant @iansc]

My first micrometer, bought in a second hand shop in Dunedin in 1963 for 2 shillings and six pence/Half a Crown. It has no ratchet, no thimble lock, it's a bit better than calipers and a 6" rule, but this was what was advertised in ME at that time and before, and was probably what was used by many modelers.

Ian S C

[vintagengineerParticipant @vintagengineer]

There is never a daft question, just daft answers!

Posted by Neil Wyatt on 03/11/2017 13:40:30:

Ahem, let's assume that someone signing themselves 'Absolute Beginner' is unlikely to be familiar with meanings of all the terms we use and help them learn.

There are no daft questions if you don't know the answers.

Neil

[HopperParticipant @hopper]

Posted by Michael Briggs on 04/11/2017 09:40:51:

Genuine Moore and Wrong:

You need to take the ruler off the job before applying the job to the bench grinder.

[Michael BriggsParticipant @michaelbriggs82422]

Hello Hopper, not guilty. Either Moore or Wrong did it.

[mechman48Participant @mechman48]

FWIW… for some info on tolerances, have a look at …

http://osp.mans.edu.eg/s-hazem/Mtdr/MTD04-2b.html

George.

​

Edited By mechman48 on 04/11/2017 12:31:26

[Mick B1Participant @mickb1]

Posted by Michael Briggs on 04/11/2017 09:40:51:

Genuine Moore and Wrong:

There are Moore like that, yer not Wrong:-

Older and more worn than yours, and perhaps not quite as bad, but the issue's clear to see.

Would never have noticed if your pic hadn't prompted me. I don't usually use the butt of the rule if I can avoid it.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Mick B1 on 04/11/2017 13:36:18:

Posted by Michael Briggs on 04/11/2017 09:40:51:

Genuine Moore and Wrong:

There are Moore like that, yer not Wrong:-

Older and more worn than yours, and perhaps not quite as bad, but the issue's clear to see.

Would never have noticed if your pic hadn't prompted me. I don't usually use the butt of the rule if I can avoid it.

.

From the photos; it looks like M&W have quite good precision on the angular setting of the guillotine … it's producing consistently bad product. It would be interesting to compare those two angles.

MivhaelG.

[Mick B1Participant @mickb1]

Posted by Michael Gilligan on 04/11/2017 13:48:30:

Posted by Mick B1 on 04/11/2017 13:36:18:

Posted by Michael Briggs on 04/11/2017 09:40:51:

Genuine Moore and Wrong

There are Moore like that, yer not Wrong:-

Older and more worn than yours, and perhaps not quite as bad, but the issue's clear to see.

Would never have noticed if your pic hadn't prompted me. I don't usually use the butt of the rule if I can avoid it.

From the photos; it looks like M&W have quite good precision on the angular setting of the guillotine … it's producing consistently bad product. It would be interesting to compare those two angles.

MivhaelG.

I think we all know that it wasn't M&W that made them, just supposedly inspected them to their standards.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Mick B1 on 04/11/2017 14:19:00:

I think we all know that it wasn't M&W that made them, just supposedly inspected them to their standards.

.

Sorry, Mick … I really don't understand the relevance of that comment.

Even if, as we can reasonably assume these days, M&W contract-out the work; M&W is, so far as I am aware, still considered to be the "Manufacturer".

MichaelG.

[Alfie PeacockParticipant @alfiepeacock58331]

I remember getting the new design M&W design combination set around the late 80s and the inspection department rejected it for tolerance, not fit for purpose. At that time I'm not sure if it was manufactured in the UK, I now have one of these combination sets and has been inspected and fit for use, again if made in the UK, purchased around 1993.

[SamsarandaParticipant @samsaranda]

Pretty certain all Moore and Wright is now produced in a Chinese factory with no production remaining in UK. Is this progress or a retrograde step brought about by the Accountants.

Dave

[Neil LickfoldParticipant @neillickfold44316]

Posted by Absolute Beginner on 02/11/2017 23:16:32:

When measuring tight tolerances with an indicator, how hard should it be pushed against the measured surface to register a correct tolerance?

What do you consider to be a tight tolerence? What talking about indicators, are you also talking about micrometers, and digital calipers as well? Or are you jst talking about diat test indiactors? With dial test indicators, the rigidity of the stand holding the indicator can have an effect on the value that you are able to measure. The smaller the units you are measuring the more difficult the task of measuring becomes. If you are talking about 0.01mm , that is very easy to measure compared to 0.001mm or 0.0005mm. Sometimes , when working to very tight tolerences, specific gauging is often made, to be able to compare these part sizes. Particular when you are making parts where the size to be acheived needs to be less than 0.001mm. In the home shop, making round things, is achieveable to 0.001mm but not when milling.

[Absolute BeginnerParticipant @absolutebeginner]

Well I have learnt to hang back a little before jumping in so some people have the chance to leave a reply.

Thank you and some of the replies have indeed helped me to understand and have given the answer to my question

Again many thanks

Gary

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