Shaper toolholders

[Rickabilly]

Thanks all,
I see where the idea has started from, It's not something that I've ever experienced and as I think the tendency for an armstrong holder to flex is far less likely than the Hss section simply breaking off especially on shapers where rigidity is not often a problem and where a 5/16" HSS section looks really small I can see why I've not seen the problem occur.

I have once heard that there is another argument that says that due to the angle of the tool bit and the constant interupted cut nose impacts there is a chance that the tool bit might be pushed back up into the holder over time, which I suppose is better than a dig in. Once again I have never seen it happen on a shaper but it does happen on a lathe so it should on a shaper too.

Incidentally when a job is correctly mounted in a shaper dig ins are no where near as catastrophic as the name sounds, often you just need to pick the job up and pop it back into the vise to go again, over my time on shapers I have had a couple of digs and never lost a job as a result,

Best regards
Rick