1. #1
    I'm trying to figure out where the hard stops should go for just in case things go haywire. I'm thinking of putting HDPE plastic blocks in-line with the ball skrews and just have the ballskrew housing crash into them. Please see drawing below, HDPE is red bits. Is this a workable plan or is it better to put the stops somewhere else?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	endstops.JPG 
Views:	522 
Size:	20.4 KB 
ID:	13904  

  2. #2
    Do you really want these ? personally I enable soft limits in Mach3 and fit mechanical limit switches to prevent over-travel, homing is taken care of by using separate homing switches.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  3. Before fitting hard stops, calculate the maximum force you are looking to handle.

    eg: 3Nm on to 5mm pitch = 0.378 tons

    Then make sure your soft stops are good

  4. #4
    If you envisage that the likelyhood of a nasty crash is high then supply your stepper PSU through a cut-off circuit with switches at the ends of travel, if you use a multi-pole, double throw relay you can E-Stop your spindle controller and E-stop your control software at the same time.
    No matter how kind your hard stops are if your machine winds into them hard you're no better of than if you hadn't fitted them at all,
    - Nick

  5. #5
    Thanks for the advice gents. I like the idea of avoiding running into any hard stops by using additional switches to disable the drivers or cut the power to the drivers and I'll look into that a bit more. I wanted a foolproof way in case something goes wrong and I run thru my limit switches and these additional switches you suggest will do exactly that.

Similar Threads

  1. TB6560 controller Runs spindle on power up When Mach3 plunges spindle stops
    By RoyT in forum Routers, Spindles & Controllers
    Replies: 5
    Last Post: 29-09-2014, 01:42 PM
  2. RFQ: Why is it so hard...
    By ktc in forum Projects, Jobs & Requests
    Replies: 10
    Last Post: 11-08-2013, 07:05 PM
  3. How hard is it to make diy PCBs if youre a Noob ?
    By Fivetide in forum Resources & Help
    Replies: 18
    Last Post: 05-04-2013, 11:10 AM
  4. RFQ: Hard colour anodising
    By Mixster in forum Projects, Jobs & Requests
    Replies: 10
    Last Post: 11-03-2013, 09:58 PM
  5. gcode stops mid way can anyone test..
    By crossleymarko in forum CAD & CAM Software
    Replies: 16
    Last Post: 21-04-2012, 11:45 PM


Posting Permissions

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