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vic francis	03/06/2020 20:05:08
125 forum posts 21 photos	Hi interesting answers. a couple of weeks ago I had to make a 6tpi 60 degree worm for a model traction engine which had unfortunately dropped off in transit... after a few trials to determine the size ect changewheel setting I cut it:however I out of all if the machine die chasers I did not have a 6tpi so ordered a unc set of four off off ebay for 10 quid ex coventry type most likely for pipe... if you use one of these in a spring tool holder that will give you the correct form after sc roughing out...( grind some of the teeth off) no need for die nuts and 3 shredded wheats... however screwcutting is hard on motors and switch gear... err anyone got a spare brooks motor!? Good luck!
Nigel McBurney 1	03/06/2020 20:42:32
1101 forum posts 3 photos	Why not go back to the earliest lathe practice,screwcut the thread to just a little oversize and finish the thread with a high speed steel machine chaser ,do not use the very early type hand chasers ,their use was mainly on brass. When using a chaser under power the chaser has to be withdrawn very quickly at the same time as the half nuts otherwise your thread will turn into a number of parallel rings .

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