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Chipping HSS

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mahgnia15/04/2014 15:07:18
45 forum posts
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Clive,

Deloro 100 is Stellite 100, not HSS but a cast cobalt/chromium alloy. Very tough and heat resistant, but not quite as hard as HSS. It needs to be used in a particular direction as the grain structure will chip with the cutting load in the wrong direction.

 

Andrew

Edited By mahgnia on 15/04/2014 15:07:55

Neil Wyatt15/04/2014 19:15:22
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19226 forum posts
749 photos
86 articles

I did an experiment today. A bit of 3/4" diameter mooring pin in the chuck. Ground the new HSS to a generous radius, finished side and top of the tool to a polish on the diamond wheel, set in the tangential holder to dead on centre height, proven by a light facing cut.. Up against a hand ground HSS tool off the shelf in it's holder, not bluint but showing signs of use.

Tried facing with both tools, forcing at the same speed. The freshly finished & new HSS chipped with less than 1mm of cut. No stall or jam up to blame. The old HSS took a 1.83mm cut without complaint.

I'll use the new HSS for cheap parallels as at least it seems to be accurately sized!

Neil

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