One of the many useful operations possible with a lathe is to cut tapers. These can be external or internal. Sometimes an external taper is cut and I want a matching internal taper. This article presents a procedure that requires no math or measuring to set up to cut the internal taper.
If you are interested, please see
Your comments are welcome. All of us are smarter than any one of us.
Very clever, Rick. Thanks.
Just to add to this discussion, not meant as a criticism of your method, here's how I've done it before.
Set the compound to track the angle of the rear side of the male taper.
Now mount a boring bar and, lathe running in reverse, cut the (male) taper on the back side of the workpiece.
The lathe is already configured to cut the female taper conventionally.
If your lathe has a chuck that threads onto the spindle, you need to be careful making the male cut. Too deep a cut and the chuck can unscrew. I've machined tapers this way but kept the cut to only a few thousandths per pass.
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Christophe Mineau (11-28-2019)
The only caveat I see with this approach is that unless the cutting tool is on the axial center-line of the spindle, the taper cut will have a concave or convex bow in it. Or so I am told by one master machinist I know.
Also, you can use a line of chalk on the male taper to check the fit in the female taper. It should be smoothly wiped if the fit is good.
You have mentioned a very significant part of angle cutting.. Any tool that you use , Indicator or cutting point of tool bit must be on dead center of the lathe. Rick does this with the indicator, altho he is doing it almost subconsciously, because he has done it so often, but doesn't mention the tool point..
Otherwise, a magnificent presentation, Rick!
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