counter bore speed.....

Not that I am ready to do it yet but, so I can jot it down in my notes...........at what speed should a HSS counter bore turn when I'm doing my knuckle stud conversion? I won't be able to get it right on, probably, since I'll be using an old drill press but, I'd like to try to get as close as I can to correct.

 

Dave , Turning / cutting Speed is about the size of the counter bore and the material that your cutting...............along with using the proper lube and having the part clamped down.

 

OK. It's a 5/8 counterbore going into what I am guessing is cast steel ( Dana 27 knuckle). I suppose feed rate is important as well, which will be a bit difficult to control on a drill press with any sort of real world accuracy.

I'd really like to do this myself, as others have done it, successfully, on a drill press. I may have the option of having a friend who do it on a mill, at his work.

What lubricant is suggested? I'd be squirting it on there vs. the way a proper machine might apply it "automatically."

 

Dave , some forms of cast iron can be drilled or machined dry but I would think that is a nodular ductile cast iron so , Just about any light oil will be fine or if you have soluble oil use it..........nodular ductile iron for drilling that size is about a 100 fpm. On you drill press just slow it down to as slow as it will go...........make sure you have a way to clamp the part down squarely and securely to the table while still keeping it aligned with the spindle center bore above.......you'll be able to feel how much feed you can apply...........make sure you have a way to measure & limit the depth of the bore or relief your cutting...........take your time.

 

Generaly if you have a choice, slower is better. A neighbor was burning up the M42 drill drill bits I loaned him. I looked at the speed he was running them in his drill press. Oh imagine that.
Neighbor kid was out drilling a hole in his bumper for a trailer socket and his father was applying lubricant on the saw. I have never seen a hole saw bent up as well as Daniel accomplished and it used to be a quality hole saw.

 

From the manual I found on line for my drill press, it seems the slowest speed I have available, which is the one it's been on since I got it, is about 610 rpm. Too fast, huh?