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Old 08-31-2023, 07:43 PM
arizonian's Avatar
arizonian arizonian is offline
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Join Date: Jul 2007
Location: Tucson, Arizona
Posts: 2,282
Default Single point pipe threads on a lathe

Once again I have a project where I need to single point pipe threads 'cause I'm too cheap to by a 2" pipe die. Tapered threads can't be cut single point without a taper attachment, so let's get that out of the way and concentrate on a straight thread. Sealing is not really an issue with this project. Pipe threads between and including 1" and 2" are 11-1/2 TPI, as are garden hose threads.

The Grizzly QC gear box has a 10, 11 and 12 TPI but no 11-1/2. It also has a means to cut metric threads with the change out of a couple of gears in the gear train feeding the QC and re-arranging the gear train to use the 127/120 tooth conversion. A multiple of 25.4 is required so that is where the 127 comes in. Using the metric gears, the closest I can come is a 2.25mm pitch, which is 11.29 TPI.

The gear train consists of a 40 tooth on the headstock driving a 127/120 tooth conversion, which drives either a 30, 32 or 40 tooth on the QC. For imperial threading, the 40 drives the 127, which in turn drives the other 40 at the QC.

Any body have any similar experience?
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Bill in sunny Tucson

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Last edited by arizonian; 09-03-2023 at 12:09 AM.
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