Monarch 612-2516 lathe

[rabler]

I noticed how pretty the square hole looked and was impressed. With a single pass square broach, I think it's SOP to use a slightly oversize starting hole, which leaves the 4 arc segments remaining.

Thanks, I was pleased with that gor file work.

As far as the arcs, if you think about transmitting torque with sliding fit tolerances, and the resulting wear, I guessing the effect of those arcs are minor. Vaguely similar to clearance at the minor diameter of a thread or spline.

I have noticed in pricing broaches both full square broaches and the ones for slightly oversized holes are available. The full square are significantly longer (more teeth) and pricier.