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  • Users: Matbol
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  1. Matbol

    Suitable Material for Taper Shank (DIN 69871 or 69893) with Mill (indexable inserts)

    Dear Forum Team I made a research about toolholders, specially taper shank's, and the material used for this are Case Hardening Materials, like 8620, 4320, or others, not case hardened, like H13. My question is: what material is better for a combined taper shank, like DIN 69871 or 69893, with a...
  2. Matbol

    Hardening AISI 4140 problems

    Dear Eng-Tips people We have some problems by hardening/quenching AISI 4140. We do some test with a Ø2" x 3" blank. First we austenitize the material at 840ºC for two hours at this temperature, then this material is quenched in oil, with not agitation. The material reached only 30 HRC. What I...

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