Stirling
Hot Rolled
- Joined
- Dec 11, 2013
- Location
- Alberta canada
Fretting on the front of the shank and collet is because of movement. Hydraulics do not clamp until at least 3/8-1/2" in the bore socket. Front of the tool holder bore is brazed to the outer nose, so it cannot move or clamp.
This is where shrink win. With shrink you have 100% clamping the entire bore length and 100% all around. The very extreme front of the tool holder is clamping just as hard as the back of the tool holder. Maybe just a little less depending on the thickness at the nose.
2 questions
Frank, do you make a "roughing" shrink fit? something with a short guage length, maybe a bit more girth too?
or would you moreso recomend a side lock even for these hsm type toolpaths?
ANYONE
in saying that, how would most people mill out a part like this? again im almost 20 years of big ugly manual machines, mostly repairs and only self taught on the cnc mill stuff, learning is earning!
1" indexable and ramp down the whole outside and bore?
3/4 solid hsm or big step over?
plundge mill?
(should be cast i know! ;p)
my goals would be process reliability, low coonsumable cost per part (i dont mind upfront costs) and not beating the hell out of the machine
machine is a 2009 vf2 (brand new condition 450 hours) 20hp 10,000rpm direct drive(my understanding is the torque rating on this spindle is very low, 45lb? but the hp/torques rating stays flat almost all the way to the top rpm) standard and through spindle coolant availible, air blast availible.