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Metric Thread On Imperial Lathe

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RichardShute:
Thanks John,
that is the method you described very well in the video and I agree it is one of the widely accepted methods. The query/confusion comes because in the video, you had the compound set so as to have the angle shown in the diagrams as 27.5deg actually set to 61deg.

You seemed to have set the compound at 29 deg from the spindle axis as I tried to show in my sketch, not 29 deg from the cross slide axis as shown in your scans. Maybe I've got the wrong end of the stick because your threads look fine.

Richard

doubleboost:
This scan is taken from the boxford hand book
the angle is 29 deg

RichardShute:
Hello John,
Maybe I was making things worse, I'm not worried about whether it's 29 or 29.5 or 27.5 deg, but where the degrees are measured from.

From what you are saying, when your compound slide is parallel to the cross slide, the degree scale must read Zero. On my lathe the compound reads Zero when it is parallel to the spindle axis. There's the difference/confusion.

Richard

doubleboost:
I will go have a look :) :) :) :) :) :)

Pete.:
I agree with Richard. It all depends on how the scale is marked up on the lathe. In the video, the compound is angled 30° off parallel to the spindle axis, where it should be 30° off perpendicular. My lathe is the same I have to set the scale to 60° (or actually 60.5) for a metric thread. The way it's set in the vid will give a 91° angle thread rather than a 60.

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