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What is the SX3 Drawbar thread.

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Buffer	28/05/2021 17:23:26
430 forum posts 171 photos	Hi Does anyone know what the Sieg SX3 drawbar thread is? I have just measured it with only a rule to count the threads and it seems to be 11mm x 1.25 pitch or 0.431 inch x 20tpi which I assume would be 7/16x20. Does anyone know what it actually is? Thanks
Rob Wheatley	28/05/2021 17:41:36
52 forum posts 28 photos	Think it depends on what collet it is, if it's R8 then it is indeed 7/16
John Haine	28/05/2021 17:41:37
5563 forum posts 322 photos	Is this an R8 version? If so I think it's 7/16 unf. Just checked, R8 collet are 7/16 x 20 unf Edited By John Haine on 28/05/2021 17:43:35
Peter Cook 6	28/05/2021 17:42:16
462 forum posts 113 photos	According to the ARC website there are 3 depending on the taper. "Drawbars for the SIEG SX3 mill. Choice of M12 or 3/8” Whit thread for MT3 spindles or 7/16" UNF thread for R8 spindles."
Bazyle	28/05/2021 17:42:59
6956 forum posts 229 photos	If, somewhat astonishngly you don't have a vernier caliper or a micrometer you may be able to use the mill table and handwheel graduatons to improvise a measuring system, even make a vernier.
Buffer	28/05/2021 18:33:21
430 forum posts 171 photos	It's an r8 so the 7/16 then. Thanks for you replies it's all much appreciated.
old mart	28/05/2021 18:39:23
4655 forum posts 304 photos	Standard for R8 is 7/16 -20 as already mentioned, but I also have one or two R8 tools with metric threads, so I try to check before buying.

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