I need to stress relieve some CPM4 die inserts prior to hardcoating. Vacuum stress relieving eliminates the oxidised layer which has to be polished off before hardcoat is applied, but I can't find a local heat treater offering this service and need very quick turn around time. My question is...
I've been told that the tool steel (DIN)designated X220CrVMo 13-4 is the same as AISI D-7 and that welding in the hardened state(57 Rc) is extremely difficult. Can anyone tell me if the mat'l. cross reference is correct and is the material weldable.
Alan L. Bass, toolmaker
I'm currently grinding the tool steel CPM-4(Rc 62-64) using a DuMore #57 toolpost grinder and am having no success at all. Norton SG wheels (46G or 46H) work great on this material but I can't find anyone who sells an SG type(ceramic/alumina blend)wheel in a suitable size. This application needs...
Can anyone tell me of a supplier of carbibe burs that have the following characteristics:
1) 1/8" shank diameter
2) Single cut
3) Flutes can be either straight or low helix
4) I need both 60 deg. incl. angle and 30 deg incl. angle
5) Flutes must terminate in a sharp point or at least
with a...
