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Discussion Starter · #1 ·
Just got a musclechuck, and run into an immediate problem;
I dont have a spanner (wrench) to fit the nut.
I assumed it would be the same size as the router nut, but no.

I am all metric with my tools, dont even have an imperial vernier to measure the nut, so help;
what imperial size do I need? Because I know I'm not going to find a 25.24 mm spanner anywhere.
Pretty usre its not relevant but its a number 9 chuck.
 

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buy a whole set of SAE wrenches...

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That nut doesn't require very much torque Bob. I torqued mine too much and caused excess run out doing it. A 26mm would probably work well enough to get it on if an adjustable spanner doesn't work.
 

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That nut doesn't require very much torque Bob. I torqued mine too much and caused excess run out doing it. A 26mm would probably work well enough to get it on if an adjustable spanner doesn't work.
26mm and a shim...
 
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Bob
you need to email MuscleChuck Tom, tell which muscleChuck your own because the nuts come in 4 different sizes comes ( depends on which chuck you have )
they are good at getting right back to you
tell us which model chuck you have
 

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Discussion Starter · #13 ·
I found one.
I phoned around all my friends, who are all retired and mostly ex tradesmen. One of them found an old 9/16" whitworth, which is also 5/8" British Standard, which just happens to be 1" AF.
The other end is a 9/16"W and 5/8" BS .

And you lot wonder why metric is so popular!

I think this would be a collectable now, it has to at be least 70 years old.
Now I just have to work out how much is 12 ft/lbs without being able to use my torque wrench. And i thought this was a simple bolt on!!
 

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Bob, now you have me flummoxed. Does this mean that 1 inch is not necessarily 1 inch? How many inches are there? I thought it related to a standard Anglo- Roman thumb. I know about Imp and US gallons, but I always assumed the inch was standard. Even more of a marvel how the guys landed on the moon 50 years ago.
 

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You should still be able to find impartial weights from shop scales, in some of the junk dealers in Cyprus. There was a place in Larnaka that still had WWII era British military radio headsets - bound to have some old scales from peripteros.
 

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now is the time for a socket and a torque wrench and some conversion formulas...
metric socket too big???
shim it...
 

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shim that 6 point socket...

sheet metal..
coins..
tape..
playing card...

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Discussion Starter · #19 ·
Biagio, without going into a 50 page history of spanners (yes, they are spanners, NOT wrenches) in the past, there were dozens of ways of measuring bolts and nuts, hole diameter, bolt diameter, size of circle the nut was shaped from, etc etc. and every manufacturer made their own and sized their own, to make customers have to buy parts from the makers. So around the end of the 1800's a Mr. Whitworth attempted to standardise them all, which is where the "whitworth thread" came from. Which then became British Standard. But of course even then we has BS coarse, BS fine.

He was quite successful, but then the Uk learnt about metric and it all went to hell again.
And I havent even touched on the american SAE, and others because america is still only about 25% metrified (if that).
To make it even worse, this musclechuck nut measures 1"AF Which is stands for Across the Flats.
60 years ago when I first started using spanners on my motorcycles, I always though AF stood for American Fine thread, which just shows how screwed up things are.
Its hell out in nut and bolt land.
 

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These are spanner wrenchs to us on this side of the pond...

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