Deep Drilling Process Improvement
Just wondering if you more experienced members can make an recommendations:
303 Stainless, .089" dia hole, thru, 3.84" part length.
Current approach:
Main Spindle
#43 MA Ford 205 series drills, 1" deep, .002 ipr, 6000 rpm, .050 pecks.
#43 Gurhing 336 series parabolic, 1.85" deep, .0015 ipr, 2000 rpm, .050 pecks.
Sub Spindle
#43 MA Ford 205 series drills, 1" deep, .002 ipr, 6000 rpm, .050 pecks.
#43 Gurhing 336 series parabolic, 2.20" deep, .0015 ipr, 2000 rpm, .050 pecks.
Tolerances are .089"+.005/-.010. Some mismatch is allowed, but the go pin must slide entirely through the part. I can only reach about 2 inches deep on the main and 2.2 inches on the sub on my Citizen A20. No HPC on the machine... for now.
The process above worked well but would like to look for improvements in tool life and mismatch (the long cobalts look used up at 400 pieces and mismatch was increasing). Thinking Titex might have something that would work better?
Dan
faster than a speeding bullet...
My estimate is based on having a second pause on full retract...I have been hesitant to write code like this:
G0 z.3
G4 K100
G0 z1.95
What is the code ou you are writing? If retracts are this fast, why bother with coolant-through drills at all? mmmm?
coolant through drill setup and performance
I am now using HPC drill - Kennametal 1/8 20XD to drill 2.5 inch hole. Coolant is Rustlick 300A (for SS 303) at 1000 psi in an er16 collet.
Workpiece turns at 4500 rpm and feed is .0025. Pilot hole is .7 inches drilled with 3 flute carbide drill with 150 degree angle.
The time for the coolant drilling cycle is 10 seconds. I am running it slowly at first - later will try its full speed which takes 6.2 seconds - 5500 rpm and .003 feed. (180 sfm)
jb
jessebpm: what is your collet system?
I am cncerned about how straight the drill should be. Over a 2,5 inch length with 1/8 drill, how much misalignment allowed?
TX JB