a copper thread ?

[cnc spook]

has any one herd of a copper thread as such British standard copper ? i have and old thread chart with it on it. never seen it befor but we have and old grinder that we pulled down and the lead screw has such a thread. as we will be machineg this thread i need some more info on it if anyone can throw some light on this it would be great thanks

[E.H.Bell]

Just Google and you will find many references
such as http://www.engineeringtoolbox.com/co...sure-d_20.html
--- Hope this helps
signed Edward H. Bell

[E.H.Bell]

My apologies for the incorrect reference that I previously cited. My haste is embarrassing
- I did find this wiki reference as a possible source
http://en.wikipedia.org/wiki/British_Standard_Whitworth

- British Brass Thread is an imperial unit based screw thread. It adopts the Whitworth thread form with a pitch of 26 threads per inch for all diameters. It is often wrongly called British Standard Brass but is not actually covered by a British Standard.

Nominal sizes are usually in the range 1/8 to 2 inches.

signed Edward H. Bell

[Doug Baker]

Is the pitch of the tread 26tpi?

Regards

Doug

[E.H.Bell]

I found the following references
http://en.wikipedia.org/wiki/British...d_brass_thread
which states .......British Brass Thread thread is an imperial unit based screw thread. It adopts the Whitworth thread form with a pitch of 26 threads per inch for all diameters. It is often wrongly called British Standard Brass but is not actually covered by a British Standard.
Nominal sizes are usually in the range 1/8 to 2 inches.
another reference
http://en.wikipedia.org/wiki/British_Standard_Whitworth
which states ...... Other threads that used the Whitworth 55° angle include Brass Threads, British Standard Conduit (BSCon), Model Engineers (ME), and British Standard Copper (BSCopper).
-----
I also found this in another forum
-----------------------------------------
BA - British Association aka British Attachment
BSP - British Standard Pipe
BSB - British Standard Bicycle
BSF - British Standard Fine
BSC - British Standard Course

BSW - British Standard Whitworth.
BSBrass British Standard Brass
BSCon - British Standard Conduit
BSCopper - British Standard Copper
ME - Model Engineers

UNF - Unified National Fine
UNC - Unified National Coarse

NP - National Pipe
AN - Airforce/Navy.
ISO Metric Coarse (the common one)
ISO Metric fine (everyday but not as common as coarse, found for example on TRE's on modern cars)

With all things threadlike, a Zeuss chart, thread gauges and a micrometer/dial caliper are your friend.
----------------------------
here is a link to a Zeuss Chart
http://www.diytools.co.uk/diy/Main/s...zeus-chart.asp
-----------------------------------------
I checked my various musty hard bound books and could not find anything more on this thread's dimensions
- that' all that I have on BSCopper
signed Edward H. Bell

[niggle]

If it's a lead screw I'd doubt it's 26tpi?

If possible I'd consider machining a new leadscrew and nut either Acme or Metric Trapezoidal thread form.

You could even consider putting a new ballscrew inplace of the leadscrew.

[cnc spook]

the zues chart does not cover B.S.copper and its not in machinery handbook.
the lead screw is an acme thread but the thread in question is for a attachment on one end of the shaft (lead screw). niggle its a 20 TPI thread

[cnc spook]

hey a modified whitworth thread ay. Thats awsome thanks guys that helps alot .