Re: Looking for some boring tips
I'm 10 inches into this now!! Letting things cool off a bit, at this depth I only cut 1/8 at a time, and back out to remove the chips. Using a special boring drill, 16 inches long with coolant grooves. Shooting coolant down the top groove. I'm making a clutch mainshaft for a 1982 Gleaner M2 combine, the end I am boring has 3 steps, down to a 1 inch left handed thread, a keyway, a hardened place for a roller bearing (the hole I'm boring is the grease channel for this bearing, have to drill into this bore hole from the side next before heat treating), the outer end of the hole I'm boring has to be threaded to 1/2". On the other end of this 8 foot($3200) 2 3/4" shaft is 2 steps, a keyway and an internal 1/2 thread 1 1/2 inches deep. The total length of machined surface is 34" for both ends. All of the outer diminsions are already finished on this end, will heat treat it tonight after drilling, then make the finish cut on the other end, and thread the internal threads, and cut the 2 keyways tomorrow. I'm making a $3200 part for about $350, and the last 10 hours of my time, and probably 4-5 hours tomorrow.
I appreciate the ideas, Bob you are right on, I guess the only good idea is go slow! I have been on here all day during the long outer cuts, while the machine feeds itself
