-.1 not -1. !#$@&%

Toolroomguy · Nov 20, 2010

Oh, I can save some time, no need to have Z start at zero, I am just cutting air till -.1, edit, punch buttons, cycle start....

Sickening crunching sound as the carbide cutter shatters, sparks shooting off of the toolholder as it feeds into workpiece,jaw dropping as my hand slams the awshit button.
I was doing some of the final machining on a one of a kind, fitted, polished slide for a Para ordinace double stack stanless steel .45. :willy_nilly:

athack · Nov 20, 2010

Hate that, I know I can save some time. Turns into just lost 30 hours of machine time. Good Luck

Athack

D. Rey · Nov 20, 2010

Toolroomguy said:
Oh, I can save some time, no need to have Z start at zero, I am just cutting air till -.1, edit, punch buttons, cycle start....

Sickening crunching sound as the carbide cutter shatters, sparks shooting off of the toolholder as it feeds into workpiece,jaw dropping as my hand slams the awshit button.
I was doing some of the final machining on a one of a kind, fitted, polished slide for a Para ordinace double stack stanless steel .45.

That's a freaking heart breaker.

Hope the rest of the day is easier....Man oh man.

How about some pictures of the carnage?

SND · Nov 20, 2010

ouch, doesn't make for a good start to the weekend. I'm sure if I get a cnc that's a mistake I'll make too often, and sure scares me from it so far, I often read numbers wrong.

Toolroomguy · Nov 20, 2010

Top slot was CNC cut, bottom one was roughed out by hand.

evansmachine · Nov 20, 2010

I have a part that I goofed on just like that. It now sits next the mill that it happened on so everyday i start it up i see it and say to myself "not today".....

allen3944 · Nov 20, 2010

i guess you learned the hard way, ANYTIME you manually edit a program, ALWAYS single block it thru and run slow.sorry for your luck.

Toolroomguy · Nov 20, 2010

Toolroomguy · Nov 20, 2010

allen3944 said:
i guess you learned the hard way, ANYTIME you manually edit a program, ALWAYS single block it thru and run slow.sorry for your luck.

Yeah, but I save so much time by doing it fast and dirty.
Well, maybe not.

D. Rey · Nov 20, 2010

Thanks for the postmortem pictures.

Toolroomguy · Nov 20, 2010

D. Rey said:
Thanks for the postmortem pictures.

You're welcome.
Do you think the lock time on the pistol will be reduced by .001 seconds due to all the mass I have removed with the lightening cuts?

Cuda · Nov 20, 2010

Toolroomguy said:
Oh, I can save some time, no need to have Z start at zero, I am just cutting air till -.1, edit, punch buttons, cycle start....

Probably took longer to edit that it would just to run as is too!!! I seldom edit to save time unless it's for a long run, never for a one off part. As you found out it cost a lot of time and money to save 5 sec.

CCC · Nov 20, 2010

If it's any consolation, we just scrapped a part about the same size for a mold base. Zeroed it in with the edge finder, offset .100 the WRONG way, pushed the green button. Damn.

bucktruck · Nov 20, 2010

Do you guys not have a "distance to go" screen?

Just being a bit of a jerk, sorry. I think we've all been there, no matter how long we've been in the sport.

The worst is when you get on one of your operators for crashing a machine, then go and do the same thing a day later.

sinha · Nov 21, 2010

Many people have learnt it the hard way, including me. The accident was caused by incorrect offset setting.
Now, after doing offset setting, I call the offset and bring the tool to a known position, and check if the coordinate display is correct.

gorrilla · Nov 22, 2010

Toolroomguy said:
Oh, I can save some time, no need to have Z start at zero, I am just cutting air till -.1, edit, punch buttons, cycle start....

Sickening crunching sound as the carbide cutter shatters, sparks shooting off of the toolholder as it feeds into workpiece,jaw dropping as my hand slams the awshit button.
I was doing some of the final machining on a one of a kind, fitted, polished slide for a Para ordinace double stack stanless steel .45.

I know what you mean. I was doing a spiral flute job on a Volquartzen stainless 22 mag barrel with a match chamber in it. Went through the program once, with tool offset up to where it only cut .025 deep, to see how the numbers would work out. Looked fine, so I was gonna take another .025, sneak down into it to prevent chatter as some of them have done to me in the past. Missed the decimal. Took it down.25. Just a bit deep there. Didn't break anything but sure screwed that barrel up, not to mention my self esteem.

wrustle · Nov 22, 2010

bucktruck said:
Do you guys not have a "distance to go" screen?

Come on Buck.......that's only there for guys with NO confidence!

D. Rey · Nov 22, 2010

Toolroomguy said:
You're welcome.
Do you think the lock time on the pistol will be reduced by .001 seconds due to all the mass I have removed with the lightening cuts?

loL

You have clearly missed your true calling as a politician.

PaulT · Nov 22, 2010

Probably not what you want to hear right now, but here's my tips for avoiding CNC crashes.

1) Never use MDI commands to move the table or spindle, only use the jogging controls or MPG's for that. A while back there was a thread on really bad CNC crashes, and 90% were from bad MDI commands.

2) (Mentioned already but here it is again) Always single step through any manually written code on first run, with your brain engaged.

3) If possible, always setup your workpiece so Z0.0 is above the top of your vise jaws, ie don't sink the raw workpiece top lower than the vise jaw top. This minimizes accidental jogs through the vise jaws.

Paul T.
Power Technology

Dcrouch · Nov 23, 2010

Come on guys, lighten up with the correct procedure stuff.

We've all been positive it's set right, hit the green button, then watched as the end mill rapidly dissapears into the part. Followed by part of the tool holder.

Toolroomguy, I feel for ya!

-.1 not -1. !#$@&%

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