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You can crash a lathe all day long, but crashing a mill will cost you big $$$
On lathes I rapid to within .1" on X and .05 on Z.
On mills, I rapid Z down to within .250" with a jump height of 2" to clear clamps and whatnot.
You can crash a lathe all day long, but crashing a mill will cost you big $$$
Yeah, that got us on the qtn250 the first time I was boring a teeny tiny hole. Shortly after had my center drill shatter and stuffed my sandvik boring bar right into oblivion before I could hit the estop.For most of our work, I let the Mazatrol default determine the clearance planes on our Quick Turn lathes---which is 2mm (.080" is how I remember it) in X and Z.
The most common one to change is for a boring bar, often you don't have .080" to back up down inside a hole!
ToolCat
Yeah. Working in a Haas shop, it’s like this. Run an end mill into a vise and smash it to pieces, you’re probably ok. Might have an extra tenth of runout, what’s that matter on top of the already atrocious Haas runout spec.It's actually the opposite from what I have seen in different shops. Lathe crashes are a lot more costly than mill crashes. They can be catastrophic.
Yeah. Working in a Haas shop, it’s like this. Run an end mill into a vise and smash it to pieces, you’re probably ok. Might have an extra tenth of runout, what’s that matter on top of the already atrocious Haas runout spec.
Run a boring bar into a part with no hole, or index a turning tool into the part at 5% rapid, and you’re looking at $4000 to realign the turret/ways.
You can crash a lathe all day long, but crashing a mill will cost you big $$$
wtf???You can crash a lathe all day long, but crashing a mill will cost you big $$$
wtf what? A mill spindle will cost you $30k easy and the machine will only be down for a couple of days if you're lucky.wtf???
Worked with a guy that actually admitted to crashing a Fadal 4020. Brand new machine. I don't know what he did but he cracked the Z casting.wtf what? A mill spindle will cost you $30k easy and the machine will only be down for a couple of days if you're lucky.
Yes! We also need to be careful of machines that appear to position in a linear fashion but really don't. I believe Fanuc controls with HPCC, and other similar configurations, rapid in varying arc moves in an attempt to be smoother and/or faster and obviously this poses issues for programmers. Some control revert to true linear positioning with their high accuracy modes turned off, which is great because we can easily modify a post to turn off those modes for positioning. There are some exceptions such as some older high performance controls that revert to "hockey stick" moves when their high performance option is turned off, such as old Makino Pro controls and turning off SGI.Not just lesser machines....on one of my BBT30 machines with an 0imF control and fanuc Alpha pack with 60 metre rapids, it caught me out rapiding while down inside an enclosure.
Just kissed (couple of thou) a lug at 25%, took a bite at 50% and made a hell of a twang at 100%.
No fanuc parameter available to tweak following error or anything - it is what it is....the only solution was to rapid up clear to day light and then continue....
I've seen some really bad mill crashes and most the time things line back up. Lathe crashes, if it's a small crash a turret might get bumped but a big crash can put someone in the hospital not to mention completely scrap the machine. What comes to mind as big crash is big parts coming un-chucked at high speed wedging between the spindle and turret. If it's a box way machine hopefully only the easy stuff moved and nobody got hurt but if it's a linear guide machine you can bet every rail is completely bent.wtf what? A mill spindle will cost you $30k easy and the machine will only be down for a couple of days if you're lucky.
You pay $2k to have them come in and realign the turret. Which one do you choose?
I agree with your parameters. I use the same to a "Tee".On lathes I rapid to within .1" on X and .05 on Z.
On mills, I rapid Z down to within .250" with a jump height of 2" to clear clamps and whatnot.
You can crash a lathe all day long, but crashing a mill will cost you big $$$
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