Re: Need help internal threading 13" SB lathe 1 7/8" spindle

david pennington
 

I was taught to set the compound at 29 degrees, not 30. This keeps some pressure on the off-side of the tool and results in a clean cut on both sides of the V.



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-------- Original message --------
From: Jim_B <jim@...>
Date: 1/27/19 08:27 (GMT-07:00)
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Need help internal threading 13" SB lathe 1 7/8" spindle

One point I forget.
When your test fitting starts to fit well but still binds, take, what should be your last one or two passes, by feeding out, COUNTERCLOCKWISE, on the cross feed. Note that if you need more than one pass you will not be returning to zero on the cross feed dial.
Since. In threading at 30 degrees on the compound, you only cut on one side of the tool the off side, of the thread, is jagged. Feeding at the end straight out cleans up the off side.

-8
Jim B,

> On Jan 27, 2019, at 10:14 AM,



--
Jim B



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