New Predator build


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    Default New Predator build

    Working on assembling a Predator from George.

    A 2.7 hp teknomotor is on its way and I am building the controller box using some Chinese drivers and 420 oz steppers. More to come.

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    Attached Thumbnails Attached Thumbnails New Predator build-dsc_0507-jpg   New Predator build-dsc_0508-jpg   New Predator build-dsc_0509-jpg   New Predator build-dsc_0510-jpg  

    Last edited by ngr1; 02-06-2013 at 03:20 PM.


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    Quote Originally Posted by ngr1 View Post
    Working on assembling a Predator from George.

    A 2.7 hp teknomotor is on its way and I am building the controller box using some Chinese drivers and 420 oz steppers. More to come.
    Wich is specification the stepper motors?

    .



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    Those are 425oz motors at 3amp

    XZero cnc


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    Need the 1200oz steppers on there

    XZero cnc


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    Did you do the top yet

    XZero cnc


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    Quote Originally Posted by gio666 View Post
    Those are 425oz motors at 3amp

    Inductance: ?



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    Quote Originally Posted by jassaf View Post
    Inductance: ?
    high, i cant find the sheet right now though. i remember doing the "gecko voltage formula" and coming up with them suited to 75v+ operation.



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    Table top is now done after many holes. The cutting surface now looks much bigger with the top on.

    That is a viper sitting on top which I am getting ready as a turn-key machine.

    Spindle will be here hopefully this week. Anyone have any suggestions for where I can buy some VFD cabling? I found this one source below but some other options would be good also.

    www . soigeneris . com/belden_vfd_cable-details . aspx (Remove spaces between dots)

    Thx.

    Attached Thumbnails Attached Thumbnails New Predator build-dsc_0525-jpg   New Predator build-dsc_0527-jpg   New Predator build-dsc_0528-jpg   New Predator build-dsc_0529-jpg  



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    Quote Originally Posted by ngr1 View Post

    Spindle will be here hopefully this week. Anyone have any suggestions for where I can buy some VFD cabling? I found this one source below but some other options would be good also.

    www . soigeneris . com/belden_vfd_cable-details . aspx (Remove spaces between dots)

    Thx.

    Hi:

    Flexible Shielded Cable 4x1.5mm2 | ELECTRONIC COMPONENTS | UgraCNC.com
    .



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    Electro Sonic has all the wiring you need,


    Electro Sonic - Distributor of Electrical and Electronic Components

    XZero cnc


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    Why is the Z-axis set up so low on your machines?

    -Andy B.
    http://www.birkonium.com CNC for Luthiers and Industry http://banduramaker.blogspot.com


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    Quote Originally Posted by BanduraMaker View Post
    Why is the Z-axis set up so low on your machines?
    more rigidity on the round rail machine, if its only cutting sheet. on the predator, not necessary, raise it up for clearance i say.

    i did a test recently on my new raptor, pulling with a good 50-60lbs of force on the top of the z. i was getting barely more than 5 thou movement at the table. to put that in context, i get only little less on my novakon cast iron mill!

    predator should be at least as stiff as the raptor i think.



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    Quote Originally Posted by ihavenofish View Post
    more rigidity on the round rail machine
    I don't think it would make a round rail machine more rigid. In fact, it would probably have the opposite effect depending on the size (length) of the spindle.

    Round rail machines are most rigid at the ends of travel. If having the Z so low moves the Z axis carriage to the middle of travel during use, it will make it less rigid.

    I have my raptor set up so that the bottom of the Z-axis is flush with the bottom of the gantry. I still don't understand why George doesn't pattern the holes to allow this (I had to drill my own). Dropping the Z-axis a couple inches will have zero to slightly more than zero effect on rigidity but it affects your clearance plenty. If you want to make the machine more rigid, make the uprights shorter and use a shorter stroke Z.

    Last edited by BanduraMaker; 02-26-2013 at 05:22 PM. Reason: Grammer
    -Andy B.
    http://www.birkonium.com CNC for Luthiers and Industry http://banduramaker.blogspot.com


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    Quote Originally Posted by BanduraMaker View Post
    I have my raptor set up so that the bottom of the Z-axis is flush with the bottom of the gantry. I still don't understand why George doesn't pattern the holes to allow this (I had to drill my own). Dropping the Z-axis a couple inches will have zero to slightly more than zero affect on rigidity but it affects your clearance plenty. If you want to make the machine more rigid, make the uprights shorter and use a shorter stroke Z.
    BanduraMaker:
    I can not understand well. You can place a picture?
    thx.



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    Quote Originally Posted by ngr1 View Post
    Table top is now done after many holes. The cutting surface now looks much bigger with the top on.

    That is a viper sitting on top which I am getting ready as a turn-key machine.

    Spindle will be here hopefully this week. Anyone have any suggestions for where I can buy some VFD cabling? I found this one source below but some other options would be good also.

    www . soigeneris . com/belden_vfd_cable-details . aspx (Remove spaces between dots)

    Thx.
    How flat are the aluminum plates for table top ?

    Bob



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    Predator has little over 3 inches higher uprights than the Raptor has.
    Z axis holes have been moved

    XZero cnc


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    Also i dont think that is the final set up spot for the Z axis, he has the double bearing 2.7hp spindle

    XZero cnc


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    Quote Originally Posted by jassaf View Post
    BanduraMaker:
    I can not understand well. You can place a picture?
    thx.
    Basically with the spindle retracted I get full clearance under the gantry with a 4" bit in the chuck.

    With the spindle all the way down, it brings the nose to within about an inch-ish of the table top.

    Attached Thumbnails Attached Thumbnails New Predator build-photo-jpg  
    -Andy B.
    http://www.birkonium.com CNC for Luthiers and Industry http://banduramaker.blogspot.com


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    Quote Originally Posted by BanduraMaker View Post
    I don't think it would make a round rail machine more rigid. In fact, it would probably have the opposite effect depending on the size (length) of the spindle..
    it would reduce the leverage on the bearings, which is where most of the flex will be. the rails themselves dont flex much as that length.



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    Default More progress

    More progress to share with pictures and my first video. The only thing left is to wire up the VFD and spindle and I should be making chips. I will be doing some testing with aluminum and making use of my milling machine vise. The machine is silky smooth and fast, I almost hate to make it dirty.

    Machine is running at 6000 mm, not an actual cutting speed but neat to watch.



    Other videos will be posted at http://www.precisioncncrouter.com

    Attached Thumbnails Attached Thumbnails New Predator build-dsc_0564-jpg   New Predator build-dsc_0565-jpg   New Predator build-dsc_0566-jpg   New Predator build-dsc_0567-jpg  

    New Predator build-dsc_0568-jpg   New Predator build-dsc_0569-jpg  


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