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  1. #1

    Join Date
    Oct 2018
    Posts
    95

    60" x 40" new build

    Hey everyone! This is my build thread. There are many like it, but this one is mine!

    I've been lurking here for a while now.... watching, reading, learning, waiting.... I worked in a aerospace CNC shop for a few years, many moons ago and I want to get back into CNC machines. I finally started ordering parts for my build earlier this month. Everything is here now and I started fabrication this week on the base.

    Parts:
    C7 RM1605 ballscrews
    SBR20 supported rails
    Nema 34 motors / drivers /power supplies
    1.5kw water cooled spindle
    mach3 windows pc

    Plan:
    A) I have a plan to run 2 ball screws and 2 drive motors on the Y axis for the gantry since I've read here you can slave the Y and A axis together in mach 3 . (This would be good.)

    B) My other option is to run the signal from the breakout board into 2 separate power supplies and drivers for each motor on the y axis and pray the screws are close enough matched that there is no binding. (this seems problematic as I can't calibrate travel for each motor separately)

    C) Just use a single screw down the middle and live with it. (i'm not making airplane parts here)

    I know my motors are big (1600oz) I had originally went with the Nema 23 425oz but the seller convinced me my machine was too large for them and I needed bigger. I've read a few solutions here to getting decent rapids from Nema 34's, so I'm not too worried here. (ok, i'm a little bit worried,)

    Both of my ball screw threads appear to inter lock with each other really nice so I cant imagine they are far off from each other to cause any binding? (I could be wrong here)

    Someday, I may add a small 4th and 5th axis, so option B would be more appealing here to me if it worked alright.

    I had a lame drawing but it has already changed a lot since I started building the base. I'm using 3" x 2.5" steel I beam (free drops from work) for the base and my gantry will be 1/2" aluminum plate.

    I may post some pics as progress moves forward.

    I appreciate any help or suggestions you may have as I still have a lot to learn here.

    Thanks.

  2. #2

    Join Date
    Oct 2018
    Posts
    95

    Re: 60" x 40" new build

    No replies, Thats probably not a good sign..

    Or, maybe i'll be ok.

  3. #3
    Company Representative
    Join Date
    Oct 2005
    Posts
    819

    Re: 60" x 40" new build

    you can use this machine as your reference

    https://www.automationtechnologiesin...ne-cnc-router/

    Contact me, I will help you

  4. #4

    Join Date
    Oct 2018
    Posts
    95

    Re: 60" x 40" new build

    .

  5. #5

    Join Date
    Oct 2018
    Posts
    95
    Quote Originally Posted by automationtechinc View Post
    you can use this machine as your reference

    https://www.automationtechnologiesin...ne-cnc-router/

    Contact me, I will help you
    Thanks, we have already been talking. You were the one who talked me into the nema 34's vs the nema 23's.

    Edit, your link shows several machines?

  6. #6

    Join Date
    Oct 2018
    Posts
    95

    Re: 60" x 40" new build

    Progress. The plywood is temporary and just for checking rail movement.

  7. #7
    Registered
    Join Date
    Sep 2006
    Posts
    486

    Re: 60" x 40" new build

    Look into LinuxCNC, I'm pretty confident you can slave together 2 axes.

  8. #8
    Jdubya
    Guest

    Re: 60" x 40" new build

    Quote Originally Posted by ninefinger View Post
    Look into LinuxCNC, I'm pretty confident you can slave together 2 axes.
    Thanks, i have read alot of good things about linuxCnc. Its good to have options. I am totally unfamiliar with linux systems however.

  9. #9

    Join Date
    Oct 2018
    Posts
    95

    Re: 60" x 40" new build

    Trying to decide if my ballscrews should go on the outside of my i-beam for stability or on the inside of the ibeam to keep it clean looking. . See pic above.

  10. #10

    Join Date
    Oct 2018
    Posts
    95

    Re: 60" x 40" new build

    I decided to put the screws on the inside of the ibeam. Then if i switch to a single center screw later, i will be in the right area already.

  11. #11
    Registered
    Join Date
    Jun 2011
    Posts
    682

    Re: 60" x 40" new build

    Quote Originally Posted by Jdubya View Post
    I decided to put the screws on the inside of the ibeam. Then if i switch to a single center screw later, i will be in the right area already.
    How will you mount the table?
    Also, is the 60x40" overall dimensions or travel?

  12. #12

    Join Date
    Oct 2018
    Posts
    95

    Re: 60" x 40" new build

    Quote Originally Posted by skrubol View Post
    How will you mount the table?
    Also, is the 60x40" overall dimensions or travel?
    The table will have to be mounted from the ends of the y axis, from the ibeam. Once I'm sure i can get the dual screws working, i will work on the table. 60" x40" is the size of my rails and ball screws, (overall machine size) cutting area might be 54" x 34" ,,, best guess.

    I got both ballscrews mounted and ready to connect to my rail blocks.

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