Spindle 1" x 10 TPI help

[jim foote]

Hi All,
I have a old 1948 12" Atlas lathe. It works pretty well however, it has odd spindle size. 1"10tpi. I did find a insert for my Nova chuck. I would like to be able to take the bowl off the lathe in the chuck and thread it onto a bolt to hold it steady(in a vise) while carving it. I haven't been able to find anything with this thread size. I thought maybe a bushing could be made to convert the 1-10 to a more standard spindle size 1 1/4 x 8tpi but don't know if this is possible.
Another minor problem is the tool rest has a 5/8 post, which makes it a bit limiting on choices for tool rests. I was going to replace the banjo to a 1" but the lathe bed spacing is 2 1/4". Another odd size.
Does anyone else have one of these and have overcome its short comings? thanks jim

 

[Bill Boehme]

You can get tool rests from Robust lathes.

You can get a spindle adapter from Best Wood Tools.

 

[hockenbery]

Hi All, I have a old 1948 12" Atlas lathe. It works pretty well however, it has odd spindle size. 1"10tpi. I did find a insert for my Nova chuck. I would like to be able to take the bowl off the lathe in the chuck and thread it onto a bolt to hold it steady(in a vise) while carving it. I haven't been able to find anything with this thread size. I thought maybe a bushing could be made to convert the 1-10 to a more standard spindle size 1 1/4 x 8tpi but don't know if this is possible. Another minor problem is the tool rest has a 5/8 post, which makes it a bit limiting on choices for tool rests. I was going to replace the banjo to a 1" but the lathe bed spacing is 2 1/4". Another odd size. Does anyone else have one of these and have overcome its short comings? thanks jim

Jim,

If you have a faceplate 1x10 you can use it to cut threads on wood.

I made a vacuum holder by taking some scrap purple heart( we used to get it really cheap from marine cut offs)

Turn a 1" column to fit my banjo.

Drilled a hole through the top and and an intersecting hole from the side.
The side hole I just screwed in an air fitting for my vacuum.
The top I turned to the diameter of the thread bottoms( Technical term? Gullets?) of my faceplate with a slight taper to get inside the threads.
Screw the face plate to a 2x4 for leverage, lock the shaft in the banjo, the put some wax on the section to thread turn the faceplate I until it gets hard to turn.
Loosen and tighten and wax. If it is too tight to thread turn a tiny bit off wood away.

This is easy and quick to make.

If I have work in a chuck chuck, I can screw that on an not use the vacuum
I can thread on a vacuum chuck and hold anything the vacuum chuck can hold while I work on it.

 

[hockenbery]

Jim,

Call ONEWAY. The offer their banjo for many lathes.
IMHO it is the best banjo available.

Al

 

[Bill Boehme]

.... The top I turned to the diameter of the thread bottoms( Technical term? Gullets?) of my faceplate with a slight taper to get inside the threads.....

If I correctly understand what you are describing then it would be a counterbore.

 

[jim foote]

Jim,
If you have a faceplate 1x10 you can use it to cut threads on wood.


Thanks I haven't thought of this I'll try it. jim

 

[hockenbery]

If I correctly understand what you are describing then it would be a counterbore.

trying to describe the valley between the threads. It is a gullet on a saw blade a trough on a wave.

 

[Bill Boehme]

trying to describe the valley between the threads. It is a gullet on a saw blade a trough on a wave.

That is just called the root of the thread -- not a very glamorous name. Here is a diagram that names the parts of a thread: Thread Parts

 

[hockenbery]

That is just called the root of the thread -- not a very glamorous name. Here is a diagram that names the parts of a thread: Thread Parts

The wood diameter needs to be a couple hairs less that major diameter of the thread.

Then the faceplate (screw in the diagram) can cut/ compress the wood to make the thread.

Al

 

[Joe Greiner]

The wood diameter needs to be a couple hairs less that major diameter of the thread.

Then the faceplate (screw in the diagram) can cut/ compress the wood to make the thread.

Al

Boiling the wood will make it more compliant to compression. Oil the faceplate threads to assist removal after drying. If the wood rebounds, use the thread imprint to carve usable threads; for a carving support they don't have to be perfect.

Also, turn a leading taper to help start the threading; cut off afterwards.