. .
Page 3 of 3 FirstFirst 123
  1. #21
    Quote Originally Posted by routercnc View Post
    The other thing to think about is for an axis with double ballscrews you need to be able to square the gantry. This might mean being able to rotate one ballscrew very slightly by hand (without the pulley secured) until the gantry is square, so a key way or D flat would not work as this puts the pulley at a fixed location on the ballscrew. A simple pair of grub screws allows the pulley to sit at any angle on the ballscrew.
    Shouldn't it be possible to auto-square using 2 drivers and adjustable endstops?

  2. #22
    Quote Originally Posted by routercnc View Post
    The other thing to think about is for an axis with double ballscrews you need to be able to square the gantry. This might mean being able to rotate one ballscrew very slightly by hand (without the pulley secured) until the gantry is square,
    Which is what I do with my twin screw router

  3. #23
    Quote Originally Posted by JeffZ View Post
    Shouldn't it be possible to auto-square using 2 drivers and adjustable endstops?
    Yes but you likely need to square it when you first build it.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  4. The Following User Says Thank You to routercnc For This Useful Post:


  5. #24
    Quote Originally Posted by JeffZ View Post
    Shouldn't it be possible to auto-square using 2 drivers and adjustable endstops?
    Yes and No.?

    The problem with using the switches to get the square is you are applying twisting forces on the gantry/linear bearings/ball screw combination causing friction that will very quickly rob power and lead to stalls or missed steps and excessive wear.!.

    You need to set the gantry as close to square as possible mechanically ie: loosening pulleys and plates etc so there are no twisting forces on the linear bearings and ball screws. So having setscrews rather than key ways allows you to turn the ball-screw and have it spin in the pulley for fine-tuning because the belt pitch won't allow fine-tuning.

    Then if required only use the switches for the very fine tuning.
    -use common sense, if you lack it, there is no software to help that.

    Email: [email protected]

    Web site: www.jazzcnc.co.uk

  6. The Following User Says Thank You to JAZZCNC For This Useful Post:


  7. #25
    Quote Originally Posted by JAZZCNC View Post
    Yes and No.?

    The problem with using the switches to get the square is you are applying twisting forces on the gantry/linear bearings/ball screw combination causing friction that will very quickly rob power and lead to stalls or missed steps and excessive wear.!.

    You need to set the gantry as close to square as possible mechanically ie: loosening pulleys and plates etc so there are no twisting forces on the linear bearings and ball screws. So having setscrews rather than key ways allows you to turn the ball-screw and have it spin in the pulley for fine-tuning because the belt pitch won't allow fine-tuning.

    Then if required only use the switches for the very fine tuning.
    Ah, that makes sense. Thank you for explaining.

  8. #26
    Quote Originally Posted by JeffZ View Post
    I did some more research and came across these types of clamping pulleys:
    Attachment 29868

    What are your thoughts on these?
    I'd give these a go on the ballscrew end.
    Needs a bit more research but I've seen them on aliexpress.

    https://www.aliexpress.com/item/4000311379356.html

    Edit:
    Amazon is much more £
    https://www.amazon.co.uk/s?k=clamp+T...ref=nb_sb_noss

  9. The Following User Says Thank You to dazp1976 For This Useful Post:


  10. #27
    IMO The advantages of "taper-lok" and my DIY ER solution is that they are more compact, better concentricity, better grip, no damage to the shaft from grub screws, infinite ajustability and depending on pulley size less mass.

  11. The Following User Says Thank You to johnsattuk For This Useful Post:


Page 3 of 3 FirstFirst 123

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Carbide taper ball nose cutters
    By Leadhead in forum Tool & Tooling Technology
    Replies: 2
    Last Post: 08-01-2020, 06:45 AM
  2. Replies: 1
    Last Post: 13-11-2015, 12:40 AM
  3. have you put ball screws on an X2plus?
    By bmbaz in forum Milling Machines, Builds & Conversions
    Replies: 5
    Last Post: 14-05-2014, 06:56 PM
  4. buying ball screws
    By bmbaz in forum Marketplace Discussion
    Replies: 2
    Last Post: 10-05-2014, 03:57 PM
  5. Best way to machine ball screws?
    By Ross77 in forum Lead Screws, Nuts & Supports
    Replies: 34
    Last Post: 17-06-2012, 05:10 PM

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
  •