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Hi Joe and welcome, good to hear another point of view and good to have someone to debate wirh.
I would like to take up a couple of points with you.

Firstly the BA thread system is still widely used in our electrical goods and I have not heard anybody say a bad word about it but it is an old system.
Our country has gone Metric, like it or not we have to live with it, therefore have to use it.
It is what is available at a realistic price in this country and not all of us are engineers building presicion equipment so cannot justify spending huge amounts of dosh on something that may get used only twice or thrice before we pop our clogs init?
Maybe the younger members would benefit from a £400 tool but when I can buy a tool to do the same job for £8.50 then I will, the arguement of it only lasting a year means it comes with a lifetime warrenty to me init?

Secondly The sizes of pen threads are likely to be much larger than BA sizes, it's been a while but if I remember rightly BA deosn't reach as big as 8mm o/d so would be a total waste of money if a 13mm thread is needed.
More likely in this country a boot sale would revail a dead gas fitters kit full of useful BSF, UNF, Whitworth taps and dies which would also do the job admirably but if you go to your diy store to buy a set you're gonna get metric simples.

Thirdly you go to the space industry and say Acme thread "is never used in small projects." and they will laugh at you, I am currently working for the company that landed a load of them on a comet.
My duties there are as a cleaner of a clean area, if that makes any sense, I watched with interest as a machinist threaded a crystal the size of the luminous spot on my wristwatch.
The chat in these forums at the time was one of triple start threads so It was easy to bring up the subject at work (hoping to find out where they kept the tools for such and borrow them).
No such thing here was explained, it could cost anything £10,000 for a single screw to be made for a satelite, why make it in a size which would get used to replace a lost consumable screw?

With all due respect (you won't hear that from me often) so you know I mean it, rather than come and impress us with your knowledge and I am sure we duly are, answer the question, BA or Metric?
Answer has to be Metric unfortunatley.

<blockquote data-quote="Grump" data-source="post: 136548" data-attributes="member: 232">Hi Joe and welcome, good to hear another point of view and good to have someone to debate wirh.I would like to take up a couple of points with you. Firstly the BA thread system is still widely used in our electrical goods and I have not heard anybody say a bad word about it but it is an old system.Our country has gone Metric, like it or not we have to live with it, therefore have to use it.It is what is available at a realistic price in this country and not all of us are engineers building presicion equipment so cannot justify spending huge amounts of dosh on something that may get used only twice or thrice before we pop our clogs init?Maybe the younger members would benefit from a £400 tool but when I can buy a tool to do the same job for £8.50 then I will, the arguement of it only lasting a year means it comes with a lifetime warrenty to me init?Secondly The sizes of pen threads are likely to be much larger than BA sizes, it&#039;s been a while but if I remember rightly BA deosn&#039;t reach as big as 8mm o/d so would be a total waste of money if a 13mm thread is needed.More likely in this country a boot sale would revail a dead gas fitters kit full of useful BSF, UNF, Whitworth taps and dies which would also do the job admirably but if you go to your diy store to buy a set you&#039;re gonna get metric simples.Thirdly you go to the space industry and say Acme thread &quot;is never used in small projects.&quot; and they will laugh at you, I am currently working for the company that landed a load of them on a comet.My duties there are as a cleaner of a clean area, if that makes any sense, I watched with interest as a machinist threaded a crystal the size of the luminous spot on my wristwatch.The chat in these forums at the time was one of triple start threads so It was easy to bring up the subject at work (hoping to find out where they kept the tools for such and borrow them).No such thing here was explained, it could cost anything £10,000 for a single screw to be made for a satelite, why make it in a size which would get used to replace a lost consumable screw?With all due respect (you won&#039;t hear that from me often) so you know I mean it, rather than come and impress us with your knowledge and I am sure we duly are, answer the question, BA or Metric?Answer has to be Metric unfortunatley.</blockquote>

[QUOTE="Grump, post: 136548, member: 232"] Hi Joe and welcome, good to hear another point of view and good to have someone to debate wirh. I would like to take up a couple of points with you. Firstly the BA thread system is still widely used in our electrical goods and I have not heard anybody say a bad word about it but it is an old system. Our country has gone Metric, like it or not we have to live with it, therefore have to use it. It is what is available at a realistic price in this country and not all of us are engineers building presicion equipment so cannot justify spending huge amounts of dosh on something that may get used only twice or thrice before we pop our clogs init? Maybe the younger members would benefit from a £400 tool but when I can buy a tool to do the same job for £8.50 then I will, the arguement of it only lasting a year means it comes with a lifetime warrenty to me init? Secondly The sizes of pen threads are likely to be much larger than BA sizes, it's been a while but if I remember rightly BA deosn't reach as big as 8mm o/d so would be a total waste of money if a 13mm thread is needed. More likely in this country a boot sale would revail a dead gas fitters kit full of useful BSF, UNF, Whitworth taps and dies which would also do the job admirably but if you go to your diy store to buy a set you're gonna get metric simples. Thirdly you go to the space industry and say Acme thread "is never used in small projects." and they will laugh at you, I am currently working for the company that landed a load of them on a comet. My duties there are as a cleaner of a clean area, if that makes any sense, I watched with interest as a machinist threaded a crystal the size of the luminous spot on my wristwatch. The chat in these forums at the time was one of triple start threads so It was easy to bring up the subject at work (hoping to find out where they kept the tools for such and borrow them). No such thing here was explained, it could cost anything £10,000 for a single screw to be made for a satelite, why make it in a size which would get used to replace a lost consumable screw? With all due respect (you won't hear that from me often) so you know I mean it, rather than come and impress us with your knowledge and I am sure we duly are, answer the question, BA or Metric? Answer has to be Metric unfortunatley. [/QUOTE]

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