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This is MrPete222 You Tube video link for cutting EXTERNAL left hand thread. You can find other videos on You Tube. Are you cutting and external or internal thread?
On Mar 7, 2021, at 9:06 AM, m. allan noah <kitno455@...> wrote:
On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@...> wrote:
You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree
Sigh. Think about it. The angle of the compound in-feed does not setthe angle of the thread- the shape of the tool does. The 29 degreething is so you always cut a little on the back side, leaving a cleanflank, but do the bulk of the cutting in a direction that keeps thebacklash taken up in the compound. So, the angle does not matter atall. I thread with the cross feed going straight in, and don't touchthe compound at all, regardless of handedness. I certainly don't makea 0 degree thread :)allan-- "well, I stand up next to a mountain- and I chop it down with the edgeof my hand"