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Thread: Whoops

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  1. #1
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    Whoops

    I guess after nine years of running CNCs I am allowed to have a serious crash, but I will try to avoid repeating it.

    Stopping a chuck spinning at 1000rpm by sticking a tool holder into the jaws tends to modify the toolchanger on a TL2.
    Attached Thumbnails Attached Thumbnails Crash1.jpg   Crash2.jpg  
    An open mind is a virtue...so long as all the common sense has not leaked out.

  2. #2
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    ouch...
    and my old shop teacher used to tell me he'd smack me in the nuts with a rubber hammer if I accidentally left the chuck key in...
    So far I've been lucky, but he 'advised' me of the consequencews back in, oh, around 1970??

    at long as nobody got hurt,
    that's the main thing...

  3. #3
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    I bet you felt the "thunk" through the floor.

    That's why I'm chicken around lathes.

  4. #4

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    Hi Geof
    Was this from programing or a machine malfuction this kind of crash makes cam software very inexpensive, That sure did a number. I guess Haas does no have soft limits that you
    can set for each tool so the tool can not get to the chuck, Did I see in one of your posts
    that you where from/or lived in NZ if so where in NZ we may have been doing the same thing there at the same time
    Mactec54

  5. #5
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    It was an operator issue, coupled with the fact that I was doing a left hand thread.

    For the left hand I was starting at a Z minus location near the chuck and threading away. All my clearances checked out; when doing this the way I enter the Z offset is bring the tool to its closest location to the chuck, enter that as the Z offset then move the offset out by the distance the tool is going to travel. Perfectly safe!!

    But somehow I got the X value wrong so when the tool moved to the Z minus position the tip caught the part and the tool holder rotated in the turret. The back end of the holder kicked out just far enough to get caught by the jaws. That is why the turret is so mangled, the holder was sticking out about three inches like a pry bar.

    To answer your NZ query I lived near Auckland, place called Muriwai Beach. Left in 1966.
    An open mind is a virtue...so long as all the common sense has not leaked out.

  6. #6

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    Hi Geof
    Now I can see how it all got so mangled with it being able to turn when the tool hit, I no Muriwai Beach very well but was not living in Auckland untill 1967 & was more on the east coast & lived at Mairangi Bay I have a daughter that lives in Kumeu which is close to Muriwai Beach. I will be going to NZ on the 26 of May
    Mactec54

  7. #7
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    WOW! Uhhh...lemme' get my thoughts straight. WOW!

    Nobody got hurt? Any other damage? That exact thing scares me too. Or the jaws being too far out of the chuck and hitting the cross-slide.

    Are you going to replace the changer or go for something like the Dorian turret?
    Greg

  8. #8
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    Man Geof... Why you've done that??? That's not funny to break down a machine, don't do that again okay?

  9. #9
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    Quote Originally Posted by Donkey Hotey View Post
    ... Any other damage?...
    That is a good question.

    The replacement turret is on its way by UPS Blue and will be here tomorrow; around $4500 including freight.

    I have a spindle bearing vibration analysis booked for next week to see if it is different to the one taken a few months ago as a baseline when I got the machine.

    I don't expect anything else to show damage mostly because the chuck slowed down 'gently' over about 1-1/2" of peripheral distance. Did you read my explanation above how the tool swung around and formed a long lever arm?
    An open mind is a virtue...so long as all the common sense has not leaked out.

  10. #10
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    That right there is the reason I cannot stand mounting the 3 jaw on our SL-10. I only do it if I absolutely have to. I like out 16C collet chuck. It's round. Probably the worst I could do is bump into it. But at least it wouldn't have a much leverage as a jaw stuck out 8 or 10 inches from the spindle center.

    Good luck Geof with the new turret. Just pray that it will be at least another 9 years before you crash one like that again!!

  11. #11
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    I have had some good crashes and heard some others also. When no one gets hurt that is important. It makes me more careful setting up. When I am sure that when changing somrthing simple it is good then it can get me. I have been told I am slower setting up because I do not trust the program until proven. I am not a good programmer but wish to improve. I enjoy this site a lot and tell Geoff hang in there.

  12. #12
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    Quote Originally Posted by gizmo_454 View Post
    That right there is the reason I cannot stand mounting the 3 jaw on our SL-10. I only do it if I absolutely have to. I like out 16C collet chuck. It's round. Probably the worst I could do is bump into it. But at least it wouldn't have a much leverage as a jaw stuck out 8 or 10 inches from the spindle center.

    Good luck Geof with the new turret. Just pray that it will be at least another 9 years before you crash one like that again!!
    That is why I hide all the 3 jaw chucks that come on my machines & I forgot where I put them <G>. Only 5C & 16C collets, I don't do any work over 1 5/8".

    Now I do have engine lathes with big 3 jaw chucks for one or 2 parts.

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