Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: CNC Router Build

  1. #1
    Twilliamson's Avatar
    Join Date
    Mar 2011
    City
    Leesville
    State
    SC
    Posts
    1,244

    CNC Router Build

    Well, this is sorta outside of the scope of ORSC but im going to document this here anyway. I made the decision to proceed with a "Large" CNC Rounter build. The goal of this machine is to cut wood(Fiancée wants new cabinet doors..) and possibly 1/4 aluminum plate.

    Mechanical Stuff...
    I have ordered the Ball Screws, Linear bearings, Anti Backlash Nuts and pillow bearings to began the design. I say begin the design because I'm using CHINA sourced hardware and I dont trust the drawings, so i am going to wait until i get the parts to be certain.

    My Ballscrews and Linear Bearing should give me a machine size of ~ 35inches x 55inches. With a work area of something around 29x49. I am essentially going to rip off the design of a existing machine made by a company call Probotix.



    I have a pile of "recycled" 80/20 here at work that I saved from the scrap bin, so that is the biggest reason i am building what i am.

    My biggest challenge i see in this project is going to be the gantry supports, these are the beams that tie the base of the machine to top portion.



    I will have solidworks models eventually but 3/4 aluminum plate plus machining isn't going to be cheap. So, I am still toying with the idea of 1/2 laser cut steel or using a piece of 80/20 for the upright.

    Here are a couple close ups of the Probotix Machines x axis mechanics.



    Spindle
    My plan is to use a DeWalt 611 Router for my spindle first. I am using a 660 on my current machine and it hasn't shown any signs of wear, so the increased HP of the 611 and bigger bearings should not hurt. Eventually i might move to a watercooled vfd spindle but its not in the plans for now.

    Something similar to this.


    For the Motion Control portion, Im planning to use NEMA 23 motors @ 425oz each. This should give me a pretty strong range of motion (2@425oz) with 850oz on the y (long) axis. I might have to upgrade the x at some point but hopefully it will be adequate.


    Software
    I not sure yet which software route im going to go yet. There are 2 major options: Mach 3/4 which is windows based but requires purchase ($175) or Linux EMC CNC (free) both of these use the old school parallel port to bit bang the stepper drivers directly due to the critical timing requirements.
    Mach 3

    Linux CNC

    But has many more custom GUI options.

    That just about covers all of the "main" points.

    O, Almost forgot. For the CAM software im using a "Demo" version of CAMBAM.

    They have a unlimited trial they just limit you to how many launches of the software you use, so I keep it open in a VM and just suspend the VM when im not using it. I will likely buy it if i ever make a buck making something. Its pretty cheap $150.
    Last edited by Twilliamson; 12-30-2015 at 08:54 AM.
    Look at the Word Differently - In a World of Talkers, be a thinker and a doer.

  2. #2

    Join Date
    Feb 2011
    City
    Greenville
    State
    SC
    Posts
    2,872
    Dude this is awesome.


    Sent from my iPhone using Tapatalk

  3. #3
    SUPPORTER 97TJGUZZY's Avatar
    Join Date
    Feb 2011
    City
    Chapin
    State
    SC
    Posts
    11,809
    That's awesome man! I would say get the uprights cut in steel rather than the plastic


    Sent from my iPhone using Tapatalk
    --Brooks

  4. #4
    SUPPORTER
    Join Date
    Mar 2011
    City
    Greenville
    State
    SC
    Posts
    429
    Ideal surplus in Greenville had a some 3/4" and 1" scrap aluminum sheets. If you take a circular saw with a carbide blade you can cut it and get a small piece for what you need. From there hit up Greenville Rubber and Plastic for the waterjet. Shouldn't be to expensive to just do your gantry supports. Worst case just make the design simple and cut them out yourself.

  5. #5
    Twilliamson's Avatar
    Join Date
    Mar 2011
    City
    Leesville
    State
    SC
    Posts
    1,244
    Getting this guy modeled up.
    Look at the Word Differently - In a World of Talkers, be a thinker and a doer.

  6. #6
    SUPPORTER
    Join Date
    Mar 2011
    City
    Greenville
    State
    SC
    Posts
    429
    Do you think the single guide rail on the X is going to be sufficient to battle the torque?

  7. #7
    Twilliamson's Avatar
    Join Date
    Mar 2011
    City
    Leesville
    State
    SC
    Posts
    1,244
    And have my first this isn't going as planned moment.


    The Mounting holes in my Linear Rail aren't going to work with my SAE 80/20 Profile. So now i'm weighing my options.

    I could replace the side portions with Aluminum Flat bar 1/2 and add more cross supports.


    OR

    i could order Metric 80/20. ~ $250 Before our discount here at work and i dont have to cut what i have... Not really sure how i was going to cut what i had, precisely.
    Look at the Word Differently - In a World of Talkers, be a thinker and a doer.

  8. #8
    Twilliamson's Avatar
    Join Date
    Mar 2011
    City
    Leesville
    State
    SC
    Posts
    1,244
    And the Metric kind sucks too. Id need to mount the rail to a piece of 2 inch flat bar before i bolted it to the frame. Guess that would not be the end of the world.

    Look at the Word Differently - In a World of Talkers, be a thinker and a doer.

  9. #9
    Twilliamson's Avatar
    Join Date
    Mar 2011
    City
    Leesville
    State
    SC
    Posts
    1,244
    Quote Originally Posted by RClippa View Post
    Do you think the single guide rail on the X is going to be sufficient to battle the torque?
    **Edited - Im using 16mm Fully Supported Rail and am still trying to decide how i want to do the y axis.

    Well. I hope so, I have a buddy that has one built similar to this, and I am hoping since it will be direct drive on each side that will make up for any flexing. I will use 2 bearing per slide.

    There are a few decisions to make on the design of the gantry supports further apart, more "triangulation" but the smaller the use able work area.


    The probotix unit specs are pretty similar.

    Last edited by Twilliamson; 01-05-2016 at 03:52 PM.
    Look at the Word Differently - In a World of Talkers, be a thinker and a doer.

  10. #10
    Twilliamson's Avatar
    Join Date
    Mar 2011
    City
    Leesville
    State
    SC
    Posts
    1,244
    So, I think this is the route im going to go. Metric 80/20 with a 1/8 Flat bar bridge, M5 Through bolts into T Nuts.

    Look at the Word Differently - In a World of Talkers, be a thinker and a doer.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Clubs, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.