1. #1
    GTJim's Avatar
    Lives in Coventry, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 8-9 years. Has a total post count of 110. Received thanks 3 times, giving thanks to others 20 times.
    Hi, just hoping to draw on your experience.
    I have just decided to start my design for a router. I want a working area of approx 1000mm x 1000mm, and will mainly be used for wood but I can see the need for some aluminium work.
    I am going to base the final design of the router around components I can readily get, but I am having trouble deciding on the size of lead screws I need. I was initially thinking about 16m x 5mm pitch but I am unsure whether I should increase this to 20mm or 24mm.
    Also I was thinking about placing the X axis lead screw central under the moving gantry and using a ball screw, but would two trapezoidal lead screws running either side of the gantry work as well and be of a similar cost?
    I understand that having two ball screws on the X axis would mean two motors.
    Any advice would be welcome.

  2. #2
    Hi GTJim

    Quote Originally Posted by GTJim View Post
    Hi, just hoping to draw on your experience.
    I have just decided to start my design for a router. I want a working area of approx 1000mm x 1000mm, and will mainly be used for wood but I can see the need for some aluminium work.
    Size is similar to mine.

    Quote Originally Posted by GTJim View Post
    I am going to base the final design of the router around components I can readily get, but I am having trouble deciding on the size of lead screws I need. I was initially thinking about 16m x 5mm pitch but I am unsure whether I should increase this to 20mm or 24mm.
    I have a 25mm ballscrew on my X (your Y). I was going to use a 20mm but Zapp were out of stock. 25mm was probably overkill but I'm not complaining.

    Z axis is a 16mmx 5 ballscrew and works brilliantly throwing around a Makita 3612c.

    Steppers are 3Nm from Zapp's excellent Driver Kit 1.

    Quote Originally Posted by GTJim View Post
    Also I was thinking about placing the X axis lead screw central under the moving gantry and using a ball screw, but would two trapezoidal lead screws running either side of the gantry work as well and be of a similar cost?
    I understand that having two ball screws on the X axis would mean two motors.
    Any advice would be welcome.
    If you use a belt drive from your centrally fixed motor, you only need one and you won't get the problem of racking should one motor stall. Might be a much cheaper option to two motors/drivers/slaving headaches. Go for ballscrews if you can afford it, really.

    Cheaper alternative (but just as good IMO) is what I chose and that is a rack and pinion drive.

    Regards, Jeff.
    I get rapids of up to 4m/min stable but turned it down to 3.5m/min.
    Nothing is foolproof......to a sufficiently talented fool!

  3. #3
    GTJim's Avatar
    Lives in Coventry, United Kingdom. Last Activity: 2 Weeks Ago Has been a member for 8-9 years. Has a total post count of 110. Received thanks 3 times, giving thanks to others 20 times.
    Hi Smiler, I have read through many of your build log and found it very interesting, especially your choice of materials and you have produced a very good machine.
    I think I’ll up the size for the X and Y axis and leave the 16mm for the Z. Time to start looking around and comparing the prices of lead screws.
    The next thing are the Slides.

Similar Threads

  1. Delrin Lead nuts.
    By Kammo1 in forum Gantry/Router Machines & Building
    Replies: 14
    Last Post: 27-01-2016, 08:36 PM
  2. Cutting lead flashing?
    By Shinobiwan in forum Metalwork Discussion
    Replies: 7
    Last Post: 06-03-2013, 03:41 PM
  3. HELP:How to choose
    By sinograver in forum Milling Machines, Builds & Conversions
    Replies: 2
    Last Post: 17-10-2011, 02:00 AM
  4. one lead screw or two
    By johngoodrich in forum Gantry/Router Machines & Building
    Replies: 10
    Last Post: 13-08-2011, 02:39 PM
  5. threaded rod/lead screws
    By deannos in forum Gantry/Router Machines & Building
    Replies: 1
    Last Post: 23-05-2011, 09:40 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
  •