My lathe is not American made therefore a plate is attached to the front of the lathe to assist in selecting the proper number on the threading dial when threading using TPI. Image of the plate is included with this post.

As an example, if I wanted to cut threads at 18 TPI then looking at the chart I could engage the half-nut on the numbers 2,4,6, or 8. However, if I wanted to cut threads that were 4 TPI or say 16 TPI there are no associated numbers, rather, diagonal lines.

I don't know what to do. The lathe will cut 16 TPI or 4 TPI but since it has no numbers on the instructional plate associated with the threading dial I am at a loss. Surely there are others who may not have the same lathe but do have similar instructional plates. How do you cut a 16 TPI or 4 TPI using this chart?

Additionally, the far left plate has a column shown as "T" and directly under the "T" is a "0". I don't know the significance of the "T" or "0" and hopefully you can answer this riddle as well. The area of the plate showing dial numbers has a "T" and beneath that "16". How is this information to be use?

Help would be greatly appreciated.

Harold

As an example, if I wanted to cut threads at 18 TPI then looking at the chart I could engage the half-nut on the numbers 2,4,6, or 8. However, if I wanted to cut threads that were 4 TPI or say 16 TPI there are no associated numbers, rather, diagonal lines.

I don't know what to do. The lathe will cut 16 TPI or 4 TPI but since it has no numbers on the instructional plate associated with the threading dial I am at a loss. Surely there are others who may not have the same lathe but do have similar instructional plates. How do you cut a 16 TPI or 4 TPI using this chart?

Additionally, the far left plate has a column shown as "T" and directly under the "T" is a "0". I don't know the significance of the "T" or "0" and hopefully you can answer this riddle as well. The area of the plate showing dial numbers has a "T" and beneath that "16". How is this information to be use?

Help would be greatly appreciated.

Harold

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