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Shaper tool slot problem.

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ieezitin:
Any of you guys got thoughts on my little project here. I own an Atlas 7B shaper and I am trying to slot a piece of steel 1/8 wide x 1” long x 5/8 deep.

I ground up a small piece of HSS square stock and profiled it as per sketch. I had the machine on the slowest speed and stroke. The tool hit rather hard and tore the material (not cut) and it sounded like a file snapping every time it went in for material removal. My results were poor. Any suggestions on tool geometry, work holding and or just machine set ups.

BTW I feed the down feed with the toolpost slide and the work was held in a shaper vice with a minimum of material showing for the machining process.

Thanks for all future help.    Anthony.

John Hill:
I suggest touch up the cutting point on the tool and try again but this time get the machine running with the tool clear of the work then very, very slowly lower the tool until it makes contact with the workpiece.  The first touch may give you a clue, if the tool skids over the surface or digs right in, if it hits the edge of the work then flicks forward, they are all clues and maybe whats needed for someone to help.

John

Adept Two bench top shaper owner.

DavidA:
ieezitin,

Have you tried running a file across the surface ? maybe it's case hardened.

Dave.

ieezitin:
John.
All in all that was my approach the first time. And right from the start it was complaining. I got down into the steel about 1/16 where I had two sides and a flat I then lifted the clapper box and with a honing stone touched up all facets of the cutting edges. Is still got the bad surface finish and no nice curls that I expected.

Dave its not hardened its hot rolled regular steel stock (run of the mill steel stock in other words). Saying that the mill scale could be tough but like I mentioned above once I was in the body of it I re-sharpened the tool bit.

I was wondering if the tool geometry was correct its been twenty years since I last used a shaper and I have forgotten a lot about them and the tooling shapes but I seem to remember the tooling is not quiet far off from being the same as the lathe requirements. Where I came up from this shape was the hand broach sets you get the tooling is shaped like that. Anywho ill give it another go later see what turns up.

Happy days………..     Anthony.

John Hill:
Yea, sometimes my little shaper refuses to continue when using a wide tool.  When that happens I swap to a sharp pointed 'V' tool tip and once it has a few 'scratches' in the work I change back to the wide tool and carry on.

I suppose once the tool skips, jumps, or whatever a couple of times it has put transverse ridges on the cut which cause the tool to skip and jump some more,  I think of it like the effect of corrugations on a dirt road.

BTW, with my little shaper I had no success whatsoever with cutting slots, I only had to over feed by a tiny amount and it would all go to custard and reducing feed would not recover the situation.  So I fashioned a fitted an automatic down feed and alls well.

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