Page 5 of 5 FirstFirst ... 345
  1. #41
    So it's posable to do a 8' ball screw with out a rotating but but you are just more limited with speeds?

  2. #42
    Quote Originally Posted by charlieuk View Post
    So it's posable to do a 8' ball screw with out a rotating but but you are just more limited with speeds?
    I would say so but it would have to be a greater diameter and therefore you would need bigger motors to drive it etc. But wait for the tech boys to chirp in ..Clive

  3. #43
    Quote Originally Posted by Clive S View Post
    I would say so but it would have to be a greater diameter and therefore you would need bigger motors to drive it etc. But wait for the tech boys to chirp in ..Clive
    First prize to this man.. .

    For 8' your into 25mm screws minimum and has clive says motors & drives to match. Thou Charlie you are familiar with the motor/drives already as they are the Nema 34 and high power Kinco type you are using now.
    What you can do to help ease screw whip is use higher lead on the screws and put ratio on them. So say 20mm pitch with 2:1 will give you same feedrate as 10mm pitch but with half the RPM on screw so helping to eliminate whip etc.
    If for wood use then 25mm screws with 25mm lead and 2:1 ratio would work well as it will give decent feedrate/resolution for wood and suit slower spinning nema 34 motors better.

  4. #44
    Charlie, have you read the threads here and here? That should answer your questions.

    The critical speed for an 8' 25mm ballscrew is about 370rpm, so if 20mm pitch you'd get 370*25=7400mm/min, which might be acceptable. With a rotating nut maybe twice that.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

Page 5 of 5 FirstFirst ... 345

Similar Threads

  1. laser scanner cnc router mounted
    By deisel in forum Probing, Digitizing & Scaning
    Replies: 9
    Last Post: 30-08-2014, 01:02 PM
  2. Z mounted 4th axis
    By charlieuk in forum Linear & Rotary Motion
    Replies: 8
    Last Post: 30-04-2014, 04:31 PM
  3. wall cnc like the wall saw
    By crossleymarko in forum Machine Discussion
    Replies: 10
    Last Post: 25-03-2012, 11:24 AM
  4. wall and floor fixing am I the only one ????????????
    By luke11cnc in forum General Discussion
    Replies: 15
    Last Post: 30-12-2011, 11:45 PM
  5. CNC Wall art from JPG
    By BJ- in forum Opportunities Available & Sought
    Replies: 0
    Last Post: 29-01-2010, 03:06 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
  •