How Do I Sharpen Solid Carbide Drill Bits?
How Do I Sharpen Solid and Other Carbide Drill Bits?
Can any of the machinist experts please tell me how to sharpen –
1 Solid Carbide Two Flute Twist Drill Bits (with angles to cut hard metal)
2 Carbide Tipped Masonry Bits (for rotary and rotary+impact work in masonry)
3 Artu brand type carbide tipped twist drill bits for metal.
Need to know point angles, relief and relief angles, grinding wheel types, grinding area fpm past the drill point (or wheel RPM), etc.
I assume that diamond is best for sharpening, with silicon carbide second?
I have a General drill sharpening jig, so I can regrind bits with a resaonable accuracy, but it is the "angles" question on which i need to ask advice.
I have heard that I need to grind a secondary cutting edge on solid carbide drill bits, at an angle almost axial with the drill bit, so as to avoid micro-chipping of the edge., and subsequent poor drilling performance and premature drill bit failure. Is this correct? My ARTU drills have a reverse angled cutting edge; what should this angle be for metal cutting?
My solid bits will be used to drill stainless steel, high tensile bolts, and hardened steel, but not HSS nor tool steels.
I have yet to find a website with a good “how to grind” section on grinding solid carbide twist drills.
Does anyone know of any such websites with good material?
Sorry about the multiple questions, but my primary question is about the solid carbide drills.
Thanks, Mike