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Dec 10, 2021 - 5:20PM

Re: Need thread size and pitch - 1941 G3L

Thanks Ian, for the explanation, but where did you and others went wrong here? I saw it immediatly, as a fork slider of that small size would be only fit for a moped or a fairground attraction bike.

Ron, what dresses are you making now?? sometimes you worry me!

Lex

Ian Wright

Dec 10, 2021 - 7:29PM

Re: Need thread size and pitch - 1941 G3L

I don't know anything about the sizes of anything on a WD Matchless and I didn't even think about the sizes quoted...
My post was only to help (I hope) clear up the apparent confusion about how to express the measurements and to point out the thinking behind and purpose of tolerances ....Ian

email (option): ian@wright52.plus.com

Ron Pier

Dec 10, 2021 - 7:46PM

Re: Need thread size and pitch - 1941 G3L

What small size are you referring to Lex? The original poster quoted 1.8" which is nearly the same as the 1 13/16" you stated. Ron

email (option): ronpier@talk21.com

Alun Mills

Dec 11, 2021 - 1:43AM

Re: Need thread size and pitch - 1941 G3L

Just confirming please.

The bolts that screw into the sliders to secure the mudguard stays, part number 41-G3L-M38 (010795) are 5/16 bsf at 22tpi?

Cheers

Al

Ron Pier

Dec 11, 2021 - 7:42AM

Re: Need thread size and pitch - 1941 G3L

Mine are 5/16 Whitworth 18tpi. (Course thread for ally). Ron

email (option): ronpier@talk21.com

Lex Schmidt

Dec 11, 2021 - 6:27PM

Re: Need thread size and pitch - 1941 G3L

I just checked that, and they are in fact BSF! the bottom and top ones, 4 per slider.

Will get back on the other thing later tonight.

Cheers,

Lex

Ron Pier

Dec 11, 2021 - 7:39PM

Re: Need thread size and pitch - 1941 G3L

I haven't checked all mine. The one I took out is Whitworth so maybe a PO has modified the threads? Ron

email (option): ronpier@talk21.com

Lex Schmidt

Dec 11, 2021 - 7:50PM

Re: Need thread size and pitch - 1941 G3L

Checked 2 sliders, one NOS, and both have BSF.

So more like a POS changed yours!

Lex

Dec 11, 2021 - 7:56PM

Re: Need thread size and pitch - 1941 G3L

I think you will find these bolts are all available from Steve Surbey at AMC Classic Spares. JT

Jan

Dec 11, 2021 - 8:43PM

Re: Need thread size and pitch - 1941 G3L

Ron Pier

1 13/16" is 1.8125". As you say Lex your old imperial measurement is probably more accurate.

While we're discussing measuring....Metric measurements for engineers are in mm! cm are for dressmakers.

Ron[/quote]

The metric system has been in use since 1792, and is trusted by 15/16th of the world population... :smile:

Jan

email (option): wd.register@gmail.com

Ian Wright

Dec 11, 2021 - 9:15PM

Re: Need thread size and pitch - 1941 G3L

:laughing: :laughing:I see what you did there Jan ...The Metric system is efficient but dull...Whereas the wonderful Imperial measuring system (developed from the Winchester System of 1588), whether weights, volumes or measurements is so much more entertaining...Ian

email (option): ian@wright52.plus.com

Alun Mills

Dec 12, 2021 - 7:38AM

Re: Need thread size and pitch - 1941 G3L

Lex

Thanks, I just need to order a 5/16 22tpi tap now before my machinist does something silly and use an M8 tap.

Al

Alun Mills

Dec 16, 2021 - 3:38AM

Re: Need thread size and pitch - 1941 G3L

This worked a treat at re-cutting the thread section that was welded over.