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Restoration 3 - 1943 James ML


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So the front hub is now rebuilt, and the investment of time has been well worth it, the wheel fits perfectly and spins like a top! Rear wheel next!

First attempt ... Approved or ?? I also make the screw and nut, but if they can be bought cheaper then I do it instead.   

Thanks Ferg but I'll pass on the hat! I've never wanted to be involved with the UK Mason's let alone the madness of the US lot!! My early MK1 ended up in India from where it was repatriated by Pe

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13 hours ago, Anders Nielsen said:

Nice, exactly what i was looking for.
Now vi just need some measurements of the wiring "clip"

And the screw, is it a screw or a bolt?
It is listet in the parts list whit the same part No as the screw for the chain guard.. So the must be Identical.

I don't think the parts list is right here, haven't checked my P/L's yet though. what is the hole size in the forks?, the rear chainguard is 1/4" from the top of my head?

Lex

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I don't think you could use a 1/4" bolt on that clip. Far too big. I've used a 2BA (nut on the outside) Originally it was probably a 3/16" BSC which is near enough the same as 2BA.   Ron

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2 hours ago, Ron said:

I don't think you could use a 1/4" bolt on that clip. Far too big. I've used a 2BA (nut on the outside) Originally it was probably a 3/16" BSC which is near enough the same as 2BA.   Ron

3/16 x 24 BSW same as the screw for the chain guard on engine end of the guard... 

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Hi Gents. 
 

So I have now had a brief look at the dimensions, my digital calipers have stopped working but I have tried to be as accurate as possible. I normally deal in MM but I have tried to convert to Imperial 🙈
 

Screw thread length = 26/64”

The part is flared:-

The largest exterior diameter = 15/16”

The inner part of the exterior flare = 7/8”

Inner diameter = 3/4”

Width = 1/2”

Screw hole = 13/64”
 

38A0441F-7B8C-4602-AB68-5E4927DEAA9D.jpeg

13EF2584-5FEB-484D-9D73-B0070BEDED88.jpeg

12C9C202-1A0D-470A-AE45-75BACF47D1FC.jpeg

409D2B99-2FFA-48CF-9F62-AF08A671F002.jpeg

C06A06E0-73A6-4139-A0D5-D5F81C3C87BE.jpeg

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1 hour ago, flyingfleasteve said:

Hi Gents. 
 

So I have now had a brief look at the dimensions, my digital calipers have stopped working but I have tried to be as accurate as possible. I normally deal in MM but I have tried to convert to Imperial 🙈
 

Screw thread length = 26/64”

The part is flared:-

The largest exterior diameter = 15/16”

The inner part of the exterior flare = 7/8”

Inner diameter = 3/4”

Width = 1/2”

Screw hole = 13/64”
 

38A0441F-7B8C-4602-AB68-5E4927DEAA9D.jpeg

13EF2584-5FEB-484D-9D73-B0070BEDED88.jpeg

12C9C202-1A0D-470A-AE45-75BACF47D1FC.jpeg

409D2B99-2FFA-48CF-9F62-AF08A671F002.jpeg

C06A06E0-73A6-4139-A0D5-D5F81C3C87BE.jpeg

Thanks Steve. That great..

Just to be sure, I also need the thicknes of the material? 

And then we can have a batch of them made .

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On 7/30/2020 at 10:07 AM, Ron said:

Steve the rear brake rod is easy. It's a standard 1/4" with a 26tpi BSC thread. 

The front rod is 5/32" with a 3BA thread.  ((4mm rod might do?)

But this guy is good with BA stuff / taps&dies and might be able to help with suitable rod.

https://www.ba-bolts.co.uk/

 

Ron

Ron, am just measuring this now, and I find my original is not BA, but 5/32" x 32 tpi. So a Model Engineer thread, can someone confirm? as we're having some repro's made.

5/32" X 32 TPI ME (tracytools.com)

Cheers,

Lex

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You're probably right Lex. I think I tested mine by using 3BA screws and nuts as a gauge. I certainly wouldn't have anything 5/32". I'll take another look tomorrow to see the fit of 3BA.  Ron

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I've just double checked both the male and female threads on my brake rod with a 3BA screw and nut and both spin on freely. My rod was on the bike when I bought it but as it was missing the top adjuster, it's very probably a repro from Metal Magic. 

There is less than half a thou between 3BA and 5/32" and the tpi is very slightly different, so I guess the two won't screw together without force.

Ron

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