Hi my name is Chase I'm new to this forum and do not have much knoledge about drill selection. So I thought I would ask the experts. I sent a fool out to pick up a couple carbide drills and he came back with 5 cobalt parabolics. I've broken three on the last three bolts and needless to say I'm fed up with them. I buying Carbide like I wanted to begin with.
My setup was clamping bolt in a tilting rotory table on a knee mill Center drilling with a #1 center drill hand plunging. drilling with #55 cobalt drill hand plunging spinning at 1500.
The handbook says I should be spining 2800 to 4000 I am going to go higher and lower to see if that helps.
I am debateing Strait Fluted carbide drills vs. Regular fluted carbide
135degree vs. 140degree
I would also like to know what you suggest for a spindle speed for a 3/64" drill a plunge rate
I also have a a couple of 3 axis CNC mills at my disposal the spindle speeds are limited to Manual knee mill 3600 Milltronics partner ~7000 I think HASS VF-4 ~8000 I think on the CNC mills if you think I really need to use them what would you sugest for a drill cycle peck depth, retract... I am not a very experienced cnc machinist (~100hours) but I am comptent and would appriciate any thoughts and sugestions regarding setup.
Thanks Chase