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My mistake I wrote 1 1/2 instead of 2 1/2 but I did have the mm correct.You are right but they do come in up to 2 1/2 inch . But at a huge cost!
Yes but at what pitch?There are several commercial threading jigs on the market.
He doesn't say what he wants to thread so not clear what pitch he needs. I have a shop-built threader that uses a router and cuts a 10 TPI thread. I have used it successfully for containers up to 4.5 inches diameter. I have not explored details of commercial units.My mistake I wrote 1 1/2 instead of 2 1/2 but I did have the mm correct.
Yes but at what pitch?