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Cut my first nice thread

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sean logie	07/12/2016 20:52:43
608 forum posts 7 photos	I tried aliminium for cutting my first thread but it was too gummy . So I thought I'd try stainless . Started of slow and easy and for the last two scratch passes I speeded up the lathe and it worked a treat . I took the chuck off tonight to check what tpi thread it was ,I'm a bit confused because there are two kind of half threads at either side of the full threads and I'm not sure which to count . The thread measured .50" across and I counted 4 full threads . Am I right in saying the chuck thread is an 8tpi ? Sean
daveb	07/12/2016 21:30:00
631 forum posts 14 photos	Buy yourself a thread pitch gauge, combined Metric/Imperial, not expensive and takes away the guesswork. A set of Zeus tables is very useful, lot of info about threads, they last well too, I paid 50p for mine but it was over 40 years ago Dave.
Emgee	07/12/2016 22:08:03
2610 forum posts 312 photos	Hi Sean, as suggested a pitch gauge would confirm the thread TPI but I would agree with you the 8TPI. Emgee
Hopper	08/12/2016 01:54:59
7881 forum posts 397 photos	If you tell us what lathe you have, someone here will doubtless be able to quote you chapter and verse of the thread specs involved.
sean logie	08/12/2016 06:22:19
608 forum posts 7 photos	This is not a thread to size,this is pick a setting and run with it . Lathe is Fortis/clausing E/801 /B Sean
Ian S C	09/12/2016 13:40:42
7468 forum posts 230 photos	Use your 6" steel rule, and if in 1/2" you count 4 threads, that would be 8 TPI. Ian S C
Michael Gilligan	09/12/2016 14:23:00
23121 forum posts 1360 photos	Posted by Ian S C on 09/12/2016 13:40:42: Use your 6" steel rule, and if in 1/2" you count 4 threads, that would be 8 TPI. . But do remember that when counting the crests, or the troughs, you are starting at zero ... It's a bit like counting 'fence panels' MichaelG.

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