Clarke 37" headstock spindle thread headache

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ekynoxe

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Hello,

I got a free Clare 37" wood lathe not long ago and I'm really enjoying exploring what I can do with it.

However, it didn't come with a faceplate and I am trying to find one that fits, so I can turn bigger bowls with a stable hold.
From all the documentation I found that the spindle is 3/4" 16TPI, and I measured it as such.

I bought this faceplate as it mentions the model of my lathe (Nu-Tool NWL37; APTC KWL37; Clarke CWL12C)

However, it doesn't screw on. It gets on the spindle for the first 5mm, but then stops, I can't screw it on any further.
Since a turner friend also gave me a faceplate to try, and it doesn't fit for the same reason, I wonder what the issue could be, and how do I identify a faceplate that would fit the threads.

I have a chuck on the lathe that does go on very well (possibly even a bit loose on the threads), so don't think it's all mangled.

I know it's a very old lathe, but since it was free, I'd like to keep going with it with minimum outlay to learn the ropes.

Thanks!
 

ekynoxe

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Sure!
It does look like the thread has been flattened on the right side.

I've added pics of my chuck as well.

IMG_1010.jpeg
IMG_1013.jpeg
IMG_1011.jpeg
 

Phill05

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Yes you have some damage on the thread I'll go and have a look in the shed if I still have a 3/4 x 16 UNF die I could send you.
 

Phill05

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Sorry looks like I do not have the 3/4 -16 anymore I have let a lot go over the last couple of years.
You should be able to find one on e-bay, the threads do need reforming to make it easy to get chuck/faceplate on.
 

ekynoxe

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Sorry looks like I do not have the 3/4 -16 anymore I have let a lot go over the last couple of years.
You should be able to find one on e-bay, the threads do need reforming to make it easy to get chuck/faceplate on.

Thank you Phill, no problem, that was an incredibly kind offer anyway!
 

ekynoxe

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Are you sure it's 3/4 x 16, some lathes had a 3/4 x 10 or 12 thread.

I counted 16 per inch on the arbor, so I think it's correct.

Using a die might restore them to the shape they are on the left, but since it's the bit on the right where a new 3/4 16tpi faceplate actually does screw on, I wonder if there was another "shape" of threads, which is not at all what the "standard" is.

The manual says it's UNF. Looking at charts, that's what 3/4 16tpi is. But that doesn't explain why a new faceplate wouldn't screw on.
 

Phill05

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I too counted 16 tpi making that UNF if it is 3/4" dia the shape of the tooth is 60 degree see the attached I have drawn a line that is 25.4 mm and shows 16 peaks, I think it is the damaged threads that is stopping the new part screwing on.
Just had a look on e-bay and you can get a die for around £10 but you need something that will hold 50mm Dia.

thread_1.JPG
 

flh801978

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A thread restoring file is a good investment for these sort of jobs and you get 8 tpi’s on the one file
Ian
 

Tanglefoot20

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Hiyas... I would use a Swiss file thin to thick edge and just clear the front few threads...you can start by hand and then finish on a slow speed...ivedne this many times...

Steve
 

ekynoxe

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Thanks a lot for the ideas guys!
Thanks @Phill05 I've ordered a die, hopefully that fixes it!

I'm assuming the chuck must be worn, somehow, if it goes on and off very easily?
 

ekynoxe

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Hurrah!

It was the correct diameter and thread! All working now!

Hopefully I can make a bigger one of those soon 😇
 

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Phill05

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Great so pleased when it all comes together, you might want to think about replacing the worn chuck now so It don't happen again.
 
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