Peroni
Cast Iron
- Joined
- May 18, 2007
- Location
- Yadkinville, NC
I've got to cut a 6"-8 npt id thread on our 2015 HAAS ST30 lathe and could use a sanity check on my calculations.
Min specified thread depth is 1.95 and we're going a bit further to 2.125 so there is no chance whatever goes in here will bottom out on the shoulder since part has a 5.5 bore thru. At the face I came up with a minor of 6.4059. Bottom end of the bore I get 6.2735. Starting .2 off the face which would give a 6.4183 start dia.
Major dia at the face I came up with 6.6059. At my thread start point of Z.2 gives X6.6183.
Do those numbers seem right? Been years since I last had the single point NPT.
Min specified thread depth is 1.95 and we're going a bit further to 2.125 so there is no chance whatever goes in here will bottom out on the shoulder since part has a 5.5 bore thru. At the face I came up with a minor of 6.4059. Bottom end of the bore I get 6.2735. Starting .2 off the face which would give a 6.4183 start dia.
Major dia at the face I came up with 6.6059. At my thread start point of Z.2 gives X6.6183.
Do those numbers seem right? Been years since I last had the single point NPT.
