And the hits just keep on coming

New Home Forum Mostly Printed CNC – MPCNC Troubleshooting – MPCNC And the hits just keep on coming

This topic contains 16 replies, has 4 voices, and was last updated by  David Walling 2 months, 3 weeks ago.

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  • #109666

    David Walling
    Participant

    I got the MPCNC put back together from upgrading to the Burly XYZ parts.

    I was running some test cuts. Nothing too extravagant, just cutting a rectangle perimeter using a 1/8″ single flute at .2″ DOC and 2ipm. Everything seemed to be going OK. There was minor chatter, but only in one direction on the rectangle, so I chalked it up to something still a tad loose… Then suddenly the bit stopped spinning and that unmistakable smell of ‘poof’ started floating up from the machine.

    Looks like my 500W spindle bit the dust 🙁 There was smoke coming out of the top of the cooling fan.

    I’ll probably go back to the dewalt spindle. I’ll need to find the locking key for changing bits as I don’t know what I did with mine during the move.

    This is starting to suck.

    #109672

    Ryan
    Keymaster

    If you get a chance take it apart and see what happened, I am interested to know if the bearings are that bad or if it was something else.

    This is starting to suck.

    No no no, chin up. You have the burly version, it should be a ripper now. The numbers you gave seem extremely conservative for wood/burly.

    #109679

    David Walling
    Participant

    I have never been able to hit the speeds everyone else has with my machine.

    #109782

    Tim
    Participant

    I have never been able to hit the speeds everyone else has with my machine.

    2 inches per minute? was that supposed to say 20?

    #109784

    David Walling
    Participant

    Currently? No. That’s not a typo.

    The best I saw with the 500w spindle was 5ipm with a 1/4″ end mill.

    We’ll see what I get when I switch back to the Dewalt.

    #109786

    Tim
    Participant

    Currently? No. That’s not a typo.

    The best I saw with the 500w spindle was 5ipm with a 1/4″ end mill.

    We’ll see what I get when I switch back to the Dewalt.

    cutting at 2ipm and .2″ DOC was probably generating a ton of heat, i’m surprised it wasn’t burnishing the material at that slow of a speed. could have contributed to the early death of your spindle…

    #109791

    David Walling
    Participant

    I had the spindle RPMs down to produce chips. I could speed up the RPMs, but then I was getting flex in the machine at the higher ipm.

    #110612

    David Walling
    Participant

    We’re up and running again.

    I have the Dewalt back on it. I ran a test cut.

     

    . 2 in DOC at 15ipm. I’m going to try increasing the DOC and lowering the feed later today.

    I’m still getting a little flex in the gantry when going in the direction that is away from the spindle.

    The Dewalt is loud, but with the shop, it’s less of an issue.

    • This reply was modified 2 months, 3 weeks ago by  David Walling.
    Attachments:
    #110633

    David Walling
    Participant

    Are my rounded corners because my z is too long? I can raise my bed.

    #110652

    Ryan
    Keymaster

    Take that giant vacuum thing off.

    1 user thanked author for this post.
    #110708

    David Walling
    Participant

    I took a video of my issue. I can wiggle the gantry like this whether there’s a vac attached or not.

    #110711

    Barry
    Participant

    Are your tubes still round?

    #110716

    David Walling
    Participant

    I rotated them when I rebuilt the machine. Is it possible I just don’t have an adjustment bolt the right tightness? Which bolt locks in the gantry more?

    #110727

    Ryan
    Keymaster

    That is not good. It is also kinda tough to solve. Like Barry is hinting at you can rotate the tubes to find a tighter fit if they are a bit oval, I would normally say take the gantry apart swap parts and rebuild it keeping a close eye for that issue to happen. It can be the Z axis, check to see the tubes are equidistant top and bottom. Sometimes looser bolts makes it fit tighter, as in you can pull it out of  place if you are not careful.

    #110752

    David Walling
    Participant

    Hot diggy! I think I found it!

    Taking a look at it, I could see that two of the wheel bearings weren’t even touching the X-axis pipe. I started looking around the machine and discovered that two of the bolts were so loose the nuts weren’t even touching the part. I snugged those up and the wheel bearings are now touching.

    If I lift up on the Z axis, there’s a slight ‘give’, but there’s no more wobble. I do see where there’s anything loose, so I’m chalking this give up to the threaded rod I’m using instead of a lead screw.

    While I can understand that the Vac attachment might have some play on it, I have the hose completely suspended so none of the weight is on the machine itself. I’d rather give some accuracy for having the dust sucked up. I knew that the play I had was way too much for what the machine should have, though.

    I’m about to run some test cuts. Wish me luck.

    #110772

    Barry
    Participant

    My vac hose hangs too, but I made the tube off the dust shoe stop about halfway up the spindle.  Less of a lever that way.

    #110777

    David Walling
    Participant

    Good idea. I can shorten the PVC pipe. My last shop vac hookup had a shorter pvc pipe. This one is something someone else designed.

    1 user thanked author for this post.
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