Page 1 of 3 123 LastLast
  1. #1
    Hi my name is Chris and I am new to CNC. I don't have an engineering background but I have always been interested in engineering and manufacturing.
    I am bullding a 4' x 2' cnc router moving gantry design. I'm aiming to cut wood plastic and occasionally aluminium. I know I've made some purchasing mistakes such as 5 mm pitch ball screws that means it will run slow but I've decided to live with this. As far as the build goes the mechanics are nearly done and i have purchased three low inductance nema 34 stepper motors for x and y (motors for moving gantry will be slaved). I have a nema 23 for z axis. I'm aiming for direct drive of the ball screws. I have already purchased a CS labs IPM controller. Next task is to decide between Mach 3 or 4 and to buy suitable stepper motor drivers and a power supply.
    Inevitably I would welcome any advice on my build. Thanks in advance ....Chris

  2. The Following 2 Users Say Thank You to chillybo For This Useful Post:


  3. #2
    Welcome Chris!
    If you use toothed belt drive from your steppers to your ball screws you can get the movement speed you want with pulley ratios.
    I don't have a gantry machine, but if I did I'd couple the screws with pulleys and a belt to eliminate any chance of them getting out of step ;-)
    You think that's too expensive? You're not a Model Engineer are you? :D

  4. The Following 2 Users Say Thank You to magicniner For This Useful Post:


  5. #3
    Quote Originally Posted by magicniner View Post
    Welcome Chris!
    If you use toothed belt drive from your steppers to your ball screws you can get the movement speed you want with pulley ratios.
    I don't have a gantry machine, but if I did I'd couple the screws with pulleys and a belt to eliminate any chance of them getting out of step ;-)
    I have got it rigged at the minute with a crude belt drive to drive the gantry ball screws (so i can move gantry up and down with a power drill while im building it). I have considered running it from one motor but when i move the timing belt (20mm wide 8mm tooth pitch) manually there seems to be to much resistance. Hence why im thinking of direct drive and slave method. If i do choose the latter im thinking of putting a thinner timing belt at the far ends of the ball screw just to mechanical sync the ball screws in addition to electronically slaving the motors (this would be a safety / gantry allignment consideration).

  6. The Following 2 Users Say Thank You to chillybo For This Useful Post:


  7. #4
    I'm not a model engineer. I am building the machine as a hobby and eventually manufacture some ideas to see if I can sell them as a sideline / hobby.

  8. The Following 2 Users Say Thank You to chillybo For This Useful Post:


  9. #5
    AndyUK's Avatar
    Lives in Southampton, United Kingdom. Last Activity: 8 Hours Ago Has been a member for 2-3 years. Has a total post count of 117. Received thanks 33 times, giving thanks to others 15 times.
    Welcome to the forum! Would love to see some photos of the machine.

    Quote Originally Posted by chillybo View Post
    I'm not a model engineer. I am building the machine as a hobby and eventually manufacture some ideas to see if I can sell them as a sideline / hobby.
    Ignore that line - its a phrase that appears at the bottom of all his posts (a signature) - Seems to confuse a number of people!

  10. The Following 2 Users Say Thank You to AndyUK For This Useful Post:


  11. #6
    Work area is a bit untidy at the moment

  12. The Following 2 Users Say Thank You to chillybo For This Useful Post:


  13. #7
    Quote Originally Posted by chillybo View Post
    Work area is a bit untidy at the moment
    Excuses It helps to see pics. Its not a good idea to have a belt joining the two screws and then using two motors . Either 2 motors or 1 motor with one belt over both screws.
    Last edited by Clive S; 15-04-2019 at 12:15 PM.
    ..Clive
    The more you know, The better you know, How little you know

  14. The Following 2 Users Say Thank You to Clive S For This Useful Post:


  15. #8
    having difficulty attaching pics bare with me

  16. The Following 2 Users Say Thank You to chillybo For This Useful Post:


  17. #9
    Hope you can see these pictures of my machine that i have attached.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_20190415_125140.jpg 
Views:	71 
Size:	99.7 KB 
ID:	25665   Click image for larger version. 

Name:	IMG_20190415_124924.jpg 
Views:	65 
Size:	96.0 KB 
ID:	25666   Click image for larger version. 

Name:	IMG_20190415_125154.jpg 
Views:	66 
Size:	89.9 KB 
ID:	25667   Click image for larger version. 

Name:	IMG_20190415_125200.jpg 
Views:	68 
Size:	124.1 KB 
ID:	25668   Click image for larger version. 

Name:	IMG_20190415_095223.jpg 
Views:	63 
Size:	113.6 KB 
ID:	25669   Click image for larger version. 

Name:	IMG_20190415_124908.jpg 
Views:	68 
Size:	160.6 KB 
ID:	25670  

  18. The Following 2 Users Say Thank You to chillybo For This Useful Post:


  19. #10
    Its not freestanding yet i'm waiting for some box section steel to arrive.

  20. The Following 2 Users Say Thank You to chillybo For This Useful Post:


Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. FOR SALE: Lots of 1.23Nm and 1.0Nm Nema 23 stepper motors
    By Jonathan in forum Items For Sale
    Replies: 0
    Last Post: 29-12-2016, 01:19 PM
  2. lots of help needed here
    By terry1956 in forum CAD & CAM Software
    Replies: 2
    Last Post: 01-08-2016, 11:34 AM
  3. RFQ: Looking for a reliable CNC prototyper in aluminium, for lots and lots of jobs
    By Felix.U in forum Projects, Jobs & Requests
    Replies: 0
    Last Post: 01-12-2015, 01:00 PM
  4. NEW MEMBER: New Member desperate to learn
    By Mill Grav Newbie in forum New Member Introductions
    Replies: 3
    Last Post: 24-04-2012, 12:17 PM
  5. NEW MEMBER: lots of questions
    By jsa2001 in forum New Member Introductions
    Replies: 13
    Last Post: 01-10-2009, 08:09 AM

Bookmarks

Posting Permissions

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