Agroshield
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...An easy way to index the three starts...
Another couple of ways that I have read of:
Set compound parallel to lathe axis and move forward one pitch. Means you can only screwcut 'straight in'.
If you are using change gears, mark two or three evenly-spaced teeth on the mandrel gear and one mark on the meshing gear. Remove, index to next mark. Replace.
Monarch made a 'multiple index face plate' specially for the job. Have a look at page 14 here:
https://www.sterlingmachinery.com/m...itive-precision-toolmakers-lathe-brochure.pdf
Edited to add:
Look at post #15 here if you have tumbler gears:
https://www.practicalmachinist.com/vb/monarch-lathes/ok-more-unknown-tooling-monarch-10ee-371035/
Here, it says if you are turning between centres, just index the dog on the chuck jaw. If you decide to cut a 2-start and use a 3-jaw chuck, the process is a little challenging:
https://www.practicalmachinist.com/vb/general-archive/threading-question-158660/