. .
  1. #1
    Hi All,
    I'm rebuilding my ali extrusion moving gantry cnc router and planning to cast a solid epoxy granite base and gantry for it. The only stumbling block I've hit is the mounts for the y-axis ball screws.

    As you can see in the images, the best method I can think of is to cast a plate into the epoxy granite wall on each end of the ballscrew so that I can attach the BK12 blocks. However, after casting, I would have to flatten these somehow, making sure they are parallel to the linear rails and level to each other.


    Can you think of a better way?
    Also, what are your thoughts on the ballscrew nut mounting. Too far below the linear rail?

    Thanks
    Neal
    Click image for larger version. 

Name:	7xZUVoh.png 
Views:	184 
Size:	75.9 KB 
ID:	30133

    Click image for larger version. 

Name:	6JwieD8.png 
Views:	174 
Size:	12.2 KB 
ID:	30134

    Click image for larger version. 

Name:	2dYRs9n.png 
Views:	167 
Size:	21.1 KB 
ID:	30135

    Click image for larger version. 

Name:	ZvG9HDx.png 
Views:	171 
Size:	57.8 KB 
ID:	30136

  2. #2
    An alternative could be to fix thick (>25mm) blocks of ali to the ends of the raised sides and screw your BK's into the edges of these? - that way you could have some adjustment. If you already have a working machine making them square shouldn't be too difficult.

  3. #3
    Quote Originally Posted by Voicecoil View Post
    An alternative could be to fix thick (>25mm) blocks of ali to the ends of the raised sides and screw your BK's into the edges of these? - that way you could have some adjustment. If you already have a working machine making them square shouldn't be too difficult.
    Interesting idea. Problem is the ballscrew isn't long enough to allow the bearing blocks to reach each end of the raised sides...

  4. #4
    What about something like this? Keep the embedded plates in the epoxy, but screw "angled" plates to it. Not just any old angled aluminium, but thick plates bolted together to create angled mounts.

    Another way would be after I epoxy level the linear rail mounts, I could flip the base on its side and epoxy level the plates too?

    Click image for larger version. 

Name:	eSJlIqC.png 
Views:	85 
Size:	58.2 KB 
ID:	30137
    Last edited by Nealieboyee; 29-06-2021 at 10:59 PM.

  5. #5
    Quote Originally Posted by Nealieboyee View Post
    Interesting idea. Problem is the ballscrew isn't long enough to allow the bearing blocks to reach each end of the raised sides...
    Could you not alter your mould to reduce the length of the raised sides relative to the base?

  6. #6
    I could, but my linear rails run the full length of the raised sides. I'd have to shorten them and reduce my cutting area along Y axis.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. BUILD LOG: A new hope: Epoxy granite and steel.
    By hardenum in forum DIY Router Build Logs
    Replies: 66
    Last Post: 27-01-2021, 03:59 PM
  2. Big Epoxy Granite machine, Which frame is better ?
    By EZELab in forum Gantry/Router Machines & Building
    Replies: 27
    Last Post: 18-09-2020, 11:18 PM
  3. BUILD LOG: Epoxy granite vertical mill build log
    By Nick in forum DIY Mill Build Logs
    Replies: 60
    Last Post: 08-06-2020, 06:30 AM
  4. Epoxy granite or mineral casting
    By mike mcdermid in forum Gantry/Router Machines & Building
    Replies: 46
    Last Post: 20-02-2014, 06:21 PM
  5. Epoxy Granite Molds?
    By gavztheouch in forum Moulding Machines
    Replies: 8
    Last Post: 18-02-2014, 07:28 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
  •