Wadkin ags 10 Lock Nut

[Fitzroy]

Been out to the shed and taken a bunch of photos and measurements best I can of the nut from my AGS10 it’s an early model with the spindle housing integral to the swing arm.

From what I can tell the thread on the spindle is square, the nut definitely has a narrower root than crest.

Fitz

 

[samweb132]

Been out to the shed and taken a bunch of photos and measurements best I can of the nut from my AGS10 it’s an early model with the spindle housing integral to the swing arm.

From what I can tell the thread on the spindle is square, the nut definitely has a narrower root than crest.

Fitz
View attachment 191527

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Thank you for the pictures. This is exactly the same as my one. Not fully checked the measurements but looks right. I will ask to return it with few pictures of other square spindles for proof.

 

[deema]

I think @Bingy man has a pint that’s not been buttoned down. I agree with the assessment that the threaded section of the spindle looks bent. Please check it out before committing another nut. I’d place a metal ruler against the threads (after a good wire brush) and with a light behind the ruler look for any gaps indicating it’s bent. Check again at 90 degrees to the first test.

 

[Bingy man]

I think @Bingy man has a pint that’s not been buttoned down. I agree with the assessment that the threaded section of the spindle looks bent. Please check it out before committing another nut. I’d place a metal ruler against the threads (after a good wire brush) and with a light behind the ruler look for any gaps indicating it’s bent. Check again at 90 degrees to the first test.

Have to say it was @Distinterior that -1st noticed this , the op has checked it though and says it’s the camera angle if I recall.

 

[samweb132]

Have to say it was @Distinterior that -1st noticed this , the op has checked it though and says it’s the camera angle if I recall.

I think @Bingy man has a pint that’s not been buttoned down. I agree with the assessment that the threaded section of the spindle looks bent. Please check it out before committing another nut. I’d place a metal ruler against the threads (after a good wire brush) and with a light behind the ruler look for any gaps indicating it’s bent. Check again at 90 degrees to the first test.

Yeh I checked and it was straight to my plastic ruler. Never checked it with a proper rule though. John Mills (DoubleBoost on youtube) currently has it and seems pretty confident he can get a nut sorted.

 

[Bingy man]

Yeh I checked and it was straight to my plastic ruler. Never checked it with a proper rule though. John Mills (DoubleBoost on youtube) currently has it and seems pretty confident he can get a nut sorted.

Hope it all goes well for you

 

[Housey210]

perhaps the spindle assembly has been swapped out by another owner?

 

[Distinterior]

perhaps the spindle assembly has been swapped out by another owner?

That was my first thought when I read Sam's post #60......

 

[J-G]

Been out to the shed and taken a bunch of photos and measurements best I can of the nut from my AGS10 it’s an early model with the spindle housing integral to the swing arm.

From what I can tell the thread on the spindle is square, the nut definitely has a narrower root than crest.

Fitz

The drawing of the thread profile - if accurate - indicates a totally non-standard thread. My initial thought on seeing it was that it might be 'Stub' ACME but the included flank angle calulates to 36.8º whereas any ACME should be 29°. The drawing also indicates a 'pitch' of 2mm so If we assume that it is a Metric thread then a Trapizoidal form should have a 30º incl. angle.

One issue is that both ACME & Trapizoidal form threads are often 'Non-Standard' since they are often used for 'non-standard' applications. ie. the 'Standard' seldom persists - except as far as the thread angle is concerned.

 

[deema]

Its definitely a square thread on the early machines.

 

[Fitzroy]

The drawing of the thread profile - if accurate - indicates a totally non-standard thread. My initial thought on seeing it was that it might be 'Stub' ACME but the included flank angle calulates to 36.8º whereas any ACME should be 29°. The drawing also indicates a 'pitch' of 2mm so If we assume that it is a Metric thread then a Trapizoidal form should have a 30º incl. angle.

One issue is that both ACME & Trapizoidal form threads are often 'Non-Standard' since they are often used for 'non-standard' applications. ie. the 'Standard' seldom persists - except as far as the thread angle is concerned.

Its definitely a square thread on the early machines.

The thread profile I drew is in the nut. The shaft has a square thread that is clear from the picture. The nut, from the best I can tell, does not have a totally square form.

 

[deema]

I’m guessing, but I suspect that the form of the thread was created by hand grounding HSS, and the discrepancy in the nut is due to that. After all the inspectors I suspect would use a go-no go gauge and as long as it passed it was good to go! After all, they couldn’t see the thread form like you can in the spindle

 

[Housey210]

treat yourself to some screw pitch gauges, metric, imperial, acme etc. you said in one reply the started to go on.

 

[samweb132]

The thread profile I drew is in the nut. The shaft has a square thread that is clear from the picture. The nut, from the best I can tell, does not have a totally square form.

Awh jeez. You are realy starting to make me doubt that the nut didn't fit.
I couldn't get it on by hand that's all I tried but was giving my all into it. Didn't want to ruin any threads. But now I'm starting to think I didn't try enough.

 

[deema]

I believe they sent you a nut for the ‘upgraded’ AGS10 which had a single bar supporting the fence, that did if memory serves have a trapezoidal thread, which is a standard thread. It would not fit your machine, you could screw it in, but you’d need a new spindle and nut afterwards!

 

[Fitzroy]

Awh jeez. You are realy starting to make me doubt that the nut didn't fit.
I couldn't get it on by hand that's all I tried but was giving my all into it. Didn't want to ruin any threads. But now I'm starting to think I didn't try enough.

As Deema said it wouldn’t fit. I was only adding info as I’ve seen a number of threads on this topic over the years and the info may help someone at some point.