What Part To Start ?


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    Default What Part To Start ?

    Long time first time....

    Hi guys, I am in full blown paralysis through analysis in trying to get my first CNC router table started. This table will be used in cabinet making for our spec houses that we build (maybe two a year), and closet systems for clients (about eight a year). I currently build these in my basement with my beloved grandfathers table saw. My plan is to build a welded steel table, 50" x 98" capacity, linear slides, rack and pinion X & Y, ball screw on the Z, 5 - 7HP ATC spindle. I'm fully aware of distortion with a welded table and have no clue (except epoxy) on how to DIY grind it flat. That brings me to my first question, what is the first part of the puzzle to buy? My uneducated mind thinks the spindle and build out from there.

    Thanks for letting me ramble on, and any thoughts or opinions are greatly appreciated.

    -Jake

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    Community Moderator ger21's Avatar
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    Default Re: What Part To Start ?

    Do you have plans or a CAD model? That's the first thing you need.

    You need the motion components so that you know all of their locations. But you can usually get that info without the components. Once you have a design, you can buy the steel and start building.
    You don't need the spindle until it's ready to run.

    Gerry

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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: What Part To Start ?

    I'd say start by building the table. Even if you never finish that machine, a big steel table is bound to come in handy. And in the meantime, you can do more research on the various rail systems, gantry beams, ball screws or rack-and-pinion systems, and spindle options that will make it into the CNC router of your dreams. It's generally recommended to build the frame first, before buying motors and drivers. since things often change in the course of a build - either the machine itself can evolve, your expectations for it might change, or your budget might have to be adjusted up or down.

    Andrew Werby
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    Default Re: What Part To Start ?

    I started out by studying a lot of DIY designs and then I just started drawing in Inkscape. I refined the design over several months with suggestions from the good folks on this forum. Motion components were pretty straightforward...at least for what I was going to use...stepper motors. Get motors with the lowest inductance you can find so your driver voltage stays reasonable. You'll need some sort of drawing I would think. Lots of examples on this site with boo boos and wish I'd had done it differently's.

    You'll have to have the motors, drivers (converts the controller signal to voltages for motor movement), controller (provides the signal to the driver), and computer. Then there's motion control software to control the controller, CAM software to make the gcode from drawings, drawing software to make the drawings.

    I used an all opensource approach...Inkscape for 2D drawings, MakerCAM for drawing conversion to gcode, Universal GCode Sender to send gcode to the controller, and an Arduinio Uno as a controller.

    Just dive in and don't be shy about asking for help or opinions.



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    Default Re: What Part To Start ?

    Thanks guys for the input.
    Would Fusion 360 work for modeling the machine? It seems to be all the rage these days on YouTube.
    My thinking originally was to size everything to handle a 25 pound spindle. I have pretty much settled on using 6” square and rectangular tube, 1/4” wall for everything. Then weld 3/8” x 1-1/2” strips to it for rail mounts. It’s getting heavy. Also, I don’t want to waste materials building a table that is ozersized for cabinet sheet material.



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    Default Re: What Part To Start ?

    I really like the base in another thread. It looks like a 5' x 10' ??? Are the vertical grind marks on the upper side rail a sign of internal bracing?

    What Part To Start ?-frame-jpg

    Attached Thumbnails Attached Thumbnails What Part To Start ?-frame-jpg  


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    Default Re: What Part To Start ?

    I don't see why Fusion360 wouldn't work. I've started using it, or more to the point, slowly have been learning it.

    Quote Originally Posted by JakeInCharlotte View Post
    Thanks guys for the input.
    Would Fusion 360 work for modeling the machine? It seems to be all the rage these days on YouTube.
    My thinking originally was to size everything to handle a 25 pound spindle. I have pretty much settled on using 6” square and rectangular tube, 1/4” wall for everything. Then weld 3/8” x 1-1/2” strips to it for rail mounts. It’s getting heavy. Also, I don’t want to waste materials building a table that is ozersized for cabinet sheet material.




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    Community Moderator ger21's Avatar
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    Default Re: What Part To Start ?

    My thinking originally was to size everything to handle a 25 pound spindle.
    I'd design it to handle 100lb loads on the tool in the spindle.



    Also, I don’t want to waste materials building a table that is ozersized for cabinet sheet material.
    I'd probably go for 52"x100" of cutting area. If you only have an inch extra, You may not be able to cut the edge of the sheet with larger tools. And most sheets come 49x97, which only gives you 1/2" to spare.

    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: What Part To Start ?

    That table in post #6 certainly isn't underbuilt in any sense.I remember the saying of a renowned engineer "It isn't hard to build a bridge that won't fall down but it takes an engineer to build a bridge that only just doesn't fall down".



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    Default Re: What Part To Start ?

    Quote Originally Posted by JakeInCharlotte View Post
    Long time first time....

    Hi guys, I am in full blown paralysis through analysis in trying to get my first CNC router table started. This table will be used in cabinet making for our spec houses that we build (maybe two a year), and closet systems for clients (about eight a year). I currently build these in my basement with my beloved grandfathers table saw. My plan is to build a welded steel table, 50" x 98" capacity, linear slides, rack and pinion X & Y, ball screw on the Z, 5 - 7HP ATC spindle. I'm fully aware of distortion with a welded table and have no clue (except epoxy) on how to DIY grind it flat. That brings me to my first question, what is the first part of the puzzle to buy? My uneducated mind thinks the spindle and build out from there.

    Thanks for letting me ramble on, and any thoughts or opinions are greatly appreciated.

    -Jake
    Good thought and starting point is the Spindle and Zaxes, one main point do you have the Power supply to drive a spindle that Big, this should be your first requirement, how much power you have single phase or 3phase

    Mactec54


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    Default Re: What Part To Start ?

    Quote Originally Posted by JakeInCharlotte View Post
    I really like the base in another thread. It looks like a 5' x 10' ??? Are the vertical grind marks on the upper side rail a sign of internal bracing?

    What Part To Start ?-frame-jpg
    That is steel plate on the sides which gets machined for Linear Rails and helical Rack mounting

    Mactec54


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    Default Re: What Part To Start ?

    Quote Originally Posted by mactec54 View Post
    Good thought and starting point is the Spindle and Zaxes, one main point do you have the Power supply to drive a spindle that Big, this should be your first requirement, how much power you have single phase or 3phase
    I have single phase 200 amp service at the house where I will be building the machine. I figured I would use a VFD or rotary for now. I'm trying to find a piece of property in Charlotte right now to move my equipment to since I have outgrown the basement. Hopefully I can get 3 phase there.

    The plate for the slides and rack and pinion make sense. What about these welds?

    What Part To Start ?-frame-jpg

    Attached Thumbnails Attached Thumbnails What Part To Start ?-frame-jpg  


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