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[JoeCB]

The whole thing looks purpose built. Back not too long ago making one off patterns and gray iron castings were not that big a deal. Someone needed a purpose...

[JoeCB]

See, another example of what can be learned from the guys here that know

Joe B...

[JoeCB]

Good thought mickeyt about "start" holes.. looking at the bushing, the grooves start close enough to the end that one could drill the start...

[JoeCB]

Oh, I'm back... Yes could do it on the shaper.... would be slow, but do-able. Looking at the bushing a little closer, there is an annular groove at the...

[JoeCB]

With the blind end of the groove, that would be a problem for a shaper. To avoid jamming up chips at the end of the stroke, might have to carefully back...

[JoeCB]

Without side tracking the OP too far... have any of you guys in the trade heard of the need ( requirement?) for filling the tubing with inert gas before...

[JoeCB]

What RPW said... better on the pull stroke with small shapers. I recently did a key in a tapered bore sprocket on my 7" Atlas. I jurry rigged an...

[JoeCB]

Very interesting and educational discussion here, thanks to all that contributed. It appears that we are heading to the source of the problem... the...