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Thread: Finishing some one elses project sugesstions appreciated

  1. #1
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    Default Finishing some one elses project sugesstions appreciated

    I recentley bougth a started cnc router project for a god price on fb marketplace.
    the machine was a bit bigger than i thougth. the machine is bassed on a moving gantry and two ballscrews connected with a belt to be driven by a single servo motor.
    A big motor to drive the axis was included and some smaler nema 23 servomotors for the other axis. but no drive electronics. the z axis is quite tall and seems flimsy to me compared to the rest of machine round supported linear rails there. the original designer / builder of the machine is no longer alive so i do not know what it was designed for.

    the plan is to use a mesa board and get some new servo motors to drive the x and z axis and likley run everything with linux cnc.
    for starters i will use a 2.2 kw chinese spindle since i have one at home already. then i will probobly upgrad the z axis with some square linear rails and maybe a beffier plate.

    any suggestions would be nice and also if anyone could have a idea what the original designer had in mind.
    all i know is that he was an enginner working @ hagglunds (now BAE) and built the machine in their shop

    for now i keep it in temporary storage becus i will get my hobbyworkshop in december. it's a bit to large for my 2 bedroom apartment =)
    so i will hopefully get started with it after the new year.

    som pictures of the machine

    Finishing some one elses project sugesstions appreciated-20210822_174825-jpg

    Finishing some one elses project sugesstions appreciated-screenshot_20210821-210830_facebook-jpg

    Finishing some one elses project sugesstions appreciated-20210820_230938-jpg

    Finishing some one elses project sugesstions appreciated-20210820_230930-jpg

    Finishing some one elses project sugesstions appreciated-20210822_134202-jpg

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    Default Re: Finishing some one elses project sugesstions appreciated

    It definitely does have some height going for it. What still needs to be done? What's the cage for - the hamsters that make it run?

    Andrew Werby
    https://computersculpture.com/


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    Default Re: Finishing some one elses project sugesstions appreciated

    whats left is to pice it togheter fully and squaring the parts. the legs with the ballscrews is one part then there is a pice mounted on top with the rails for the gantry. then the cast table for work holding and wise. and the gantry. i moved the machine in these separate parts on the trailer. there are no electronics / motors mounted so that needs to be sourced and fastend. so as it stands it's a bare shell. i hope the x/z will take nema 34 otherwise i will get the most powerfull i can in the nema 22/23 formfaktor or try to remake the mounts. then mounting a spindle. spindle and mesa bord for linux cnc is something i have from a smaller project i was building on earlier.

    the cage is just a part of the trailer that i used to move the machine =)



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    Default Re: Finishing some one elses project sugesstions appreciated

    If I stumbled across a machine with components of that quality I would be very pleased.What to do with it would be my next consideration as the potential for flexing of the gantry and the absurdly long Z axis could have serious effects on the accuracy with which the tool could describe the trajectory required for the programmed path.I suggest you try a test by locating a dial indicator by the lower end of the Z axis and apply a push with your hands to see how much movement occurs in the X direction and then repeat the test in the Y direction.I expect you can calculate the force imposed by the servos reasonably closely and then there will be the effect of the resonance of the cutting flutes.



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    Default Re: Finishing some one elses project sugesstions appreciated

    Quote Originally Posted by routalot View Post
    If I stumbled across a machine with components of that quality I would be very pleased.What to do with it would be my next consideration as the potential for flexing of the gantry and the absurdly long Z axis could have serious effects on the accuracy with which the tool could describe the trajectory required for the programmed path.I suggest you try a test by locating a dial indicator by the lower end of the Z axis and apply a push with your hands to see how much movement occurs in the X direction and then repeat the test in the Y direction.I expect you can calculate the force imposed by the servos reasonably closely and then there will be the effect of the resonance of the cutting flutes.
    Yes i will defenitly try with a force gauge and a dial indicator and se what the results are. have not checked the brand of the linear rails but the ballscrews seems to be NSK.
    i guess the scrap value for the metals could be more than what i paid about 600eur. so the parts to finish it will be a tad more. i got recommended to get a servostar 610 controller for the gantry motor and does seems to go vetween 500-1000 eur used



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Finishing some one elses project sugesstions appreciated

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Finishing some one elses project sugesstions appreciated