Stirling
Hot Rolled
- Joined
- Dec 11, 2013
- Location
- Alberta canada
Firstly I’m no CNC mill master.
So I’m running these kennimetals endmills that where on sale. The harvi te 4 and 6 flute endmills.
Cold rolled mild steel square stock
0.375 endmill. 1” doc 0.05”woc 200ipm 8000rpm
Held in Schunk tendo e hyd. Cat 40 holder with a 0.75” to 0.375 reduced.
Coolant or air last used to test. Seems to be the same problem
Haas vf-2
I’m milling less than 40 cubic inches before the endmill shears at the collet tip.
Sometimes a single break. Other times it breaks in 3 lengths. One break at the collet nose. Another 0.25”ish in side the collet
Tool is deep into the holder with 1.2” projection
Cut sounds fantastic. I only know it’s broke when I don’t hear the cutting anymore.
It does not seem like I’m pushing it hard at all. Spindle loads low. Looking at the broken endmills the flutes are perfect, tips are good (except the ones that contact/grab once broken)
What gives?
I’ve run these several times now and am getting the same result over several jobs.
Gone as hard as 0.075woc 1”doc 10,000rpm 400ipm (air blast) in 1045steel
Seems no matter how hard or soft I run it’s the same’ish metal removal before breaking.
I mean mr titan runs the same endmill at one million Ipm and rpm right??
Run the kor5 aluminum cutters way harder and they won’t die. Same tool holder and mill.
Tips, advice?
Grew up on old school manual equipment, self taught CNC. And the learning gets $$$$ some times
So I’m running these kennimetals endmills that where on sale. The harvi te 4 and 6 flute endmills.
Cold rolled mild steel square stock
0.375 endmill. 1” doc 0.05”woc 200ipm 8000rpm
Held in Schunk tendo e hyd. Cat 40 holder with a 0.75” to 0.375 reduced.
Coolant or air last used to test. Seems to be the same problem
Haas vf-2
I’m milling less than 40 cubic inches before the endmill shears at the collet tip.
Sometimes a single break. Other times it breaks in 3 lengths. One break at the collet nose. Another 0.25”ish in side the collet
Tool is deep into the holder with 1.2” projection
Cut sounds fantastic. I only know it’s broke when I don’t hear the cutting anymore.
It does not seem like I’m pushing it hard at all. Spindle loads low. Looking at the broken endmills the flutes are perfect, tips are good (except the ones that contact/grab once broken)
What gives?
I’ve run these several times now and am getting the same result over several jobs.
Gone as hard as 0.075woc 1”doc 10,000rpm 400ipm (air blast) in 1045steel
Seems no matter how hard or soft I run it’s the same’ish metal removal before breaking.
I mean mr titan runs the same endmill at one million Ipm and rpm right??
Run the kor5 aluminum cutters way harder and they won’t die. Same tool holder and mill.
Tips, advice?
Grew up on old school manual equipment, self taught CNC. And the learning gets $$$$ some times