4th axis position on table-Fadal
Close
Login to Your Account
Page 1 of 2 12 LastLast
Results 1 to 20 of 21
  1. #1
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default 4th axis position on table-Fadal

    I fussed around aligning the new to me 4th axis on my Fadal, setting the offset and then realized the servo would come blowing through the door glass on max Y positive. I have about another .250” of +Y when the end of the servo hits the door window.
    I tried moving the axis to the rear slot but it hits the Z ways with minus .3” travel left.
    So... I either need to move my cold start or remember to open the door

    Anyone see this before. My Y axis CS position indicator does seem to be maxed out to the front, so there is probably a .250 adjustment.

    Any issue with moving the cold start 1/4”?
    Thanks



    Sent from my iPhone using Tapatalk Pro

  2. #2
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    I should mention I replaced the Y screw a while back, I don’t believe I had to move the cold start indicator, I had marked the screw coupler and tried to match the old and new screw ball nut positions when I coupled the motor back up.
    Maybe I can pull the motor and rotate the screw one or two turns( I don’t recall the pitch)


    Sent from my iPhone using Tapatalk Pro

  3. #3
    Join Date
    Feb 2005
    Location
    Hatch, NM Chile capital of the WORLD
    Posts
    9,704
    Post Thanks / Like
    Likes (Given)
    16509
    Likes (Received)
    11854

    Default

    Just don't go to max Y+.

    I wouldn't mess around with trying to move your cold start position.
    That could just get you into trouble and end up with a blown driver board.

  4. #4
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    I think I’ll just leave it as is , thanks for the reply


    Sent from my iPhone using Tapatalk Pro

  5. #5
    Join Date
    Oct 2009
    Location
    Oregon
    Posts
    6,165
    Post Thanks / Like
    Likes (Given)
    6599
    Likes (Received)
    3491

    Default

    Nothing to do with Fadal specifically, but I always use a subplate and cantilever the 4th off the table. I like to put the face of the indexer at max/min X travel so I don't waste any travel, but I can mill anything I bolt to the face.

    Subplate lets you position it wherever you want in Y so you can center it.

    A friend has a nice Mori vertical with a 4th that hits the enclosure in one place. I have gotten used to it, but I still hate it. Several oh shit moments where I stopped it just in time.

  6. Likes mhajicek liked this post
  7. #6
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    I do want to eventually hang the 4th over the rightX cover. I had a sub plate on the mill, but kept having to pull it off and re oil to keep corrosion at bay, it’s large enough to gain 6” of X travel


    Sent from my iPhone using Tapatalk Pro

  8. #7
    Join Date
    May 2002
    Location
    South Central PA
    Posts
    14,613
    Post Thanks / Like
    Likes (Given)
    2842
    Likes (Received)
    4351

    Default

    Is there a limit switch that can be moved to keep it from hitting?

  9. #8
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    Quote Originally Posted by Mud View Post
    Is there a limit switch that can be moved to keep it from hitting?
    Good idea, but no limit switches, you cold start the machine on index marks so the control has a starting reference and then the control just counts ball screw turns to get to the limits


    Sent from my iPhone using Tapatalk Pro

  10. #9
    Join Date
    Jan 2003
    Location
    Posts
    612
    Post Thanks / Like
    Likes (Given)
    134
    Likes (Received)
    198

    Default

    The window should flex 0.250" Might as well get used to looking for crashes like that. Never ending with the 4th axis on table. It will always be in the way, tool holders will always want to hit jaws, coolant nozzles getting moved etc etc. Need to watch everything way closer then with 3 axis.

    What size Fadal is that? I have a 4020 and thinking about adding a smaller one too.

    Really sucks the way they have the whole cold start thing rigged up. Wish they would of came with proper home/limit switches like every other machine in the world.

  11. #10
    Join Date
    Oct 2014
    Country
    CANADA
    State/Province
    Ontario
    Posts
    1,642
    Post Thanks / Like
    Likes (Given)
    1288
    Likes (Received)
    1400

    Default

    Is this a DC servo machine? If so then I believe rotating the resolver relative to the servo will move the cold start position up to 1 thread pitch of the screw, not sure if that will be enough to give you clearance though!

    I would second the recommendation for a sub-plate! Seems a shame to waste so much X travel!

  12. #11
    Join Date
    Feb 2005
    Location
    Hatch, NM Chile capital of the WORLD
    Posts
    9,704
    Post Thanks / Like
    Likes (Given)
    16509
    Likes (Received)
    11854

    Default

    Quote Originally Posted by mmurray70 View Post

    Really sucks the way they have the whole cold start thing rigged up. Wish they would of came with proper home/limit switches like every other machine in the world.
    What is cool though, is that the only machine I've never had a limit switch problem with, was a Fadal..
    Unless you count the tool changer.

    One more thing to break, one more thing to fix, and when it was new, one less thing you(they) had to pay for.

    On a 4020, you have plenty of room(Y axis) with a vh65. I'm guessing this is a 3016.

  13. Likes triumph406 liked this post
  14. #12
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    DC control VMC 20


    Sent from my iPhone using Tapatalk Pro

  15. #13
    Join Date
    Nov 2008
    Location
    California, USA
    Posts
    86
    Post Thanks / Like
    Likes (Given)
    8
    Likes (Received)
    17

    Default

    Not sure how ambitious you are but this is how I dealt with the same problem with a VH65 on a 3016. Nice to be able to move the 4th out of the way, as well as get some X back. You could make something similar offset in Y without a subplate.

    4th-1.jpg4th-2.jpg

  16. Likes Mud liked this post
  17. #14
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    Thanks for the reply
    I can’t really make out the second pic, does the 4th mount to a dovetail base that slides in X (adjustable?)


    Sent from my iPhone using Tapatalk Pro

  18. #15
    Join Date
    Nov 2008
    Location
    California, USA
    Posts
    86
    Post Thanks / Like
    Likes (Given)
    8
    Likes (Received)
    17

    Default

    Yes, sorry for the confusion, you got it right. The second picture is the back of the 4th axis, looking in from the right side of the machine. I have a collet closer hanging out the back of the 4th, so the limit on moving it x+ off the table is when it hits the right hand window. I basically get the entire table when it is "parked." Hasn't been off the machine in years (taking the VH65 in and out, and messing with connectors and the control is a PITA.)

  19. #16
    Join Date
    Dec 2015
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    1,387
    Post Thanks / Like
    Likes (Given)
    32
    Likes (Received)
    469

    Default

    That’s pretty cool, thx


    Sent from my iPhone using Tapatalk Pro

  20. #17
    Join Date
    Nov 2004
    Location
    RC, CA
    Posts
    2,196
    Post Thanks / Like
    Likes (Given)
    228
    Likes (Received)
    473

    Default

    Leave the CS in the center, and set the home position at 7.5. Easy to change back to 8 if you want the table closer without it. Just need to remember.

  21. #18
    Join Date
    May 2017
    Country
    UNITED STATES
    State/Province
    Minnesota
    Posts
    1,894
    Post Thanks / Like
    Likes (Given)
    2538
    Likes (Received)
    1294

    Default

    Use steel for your subplate so you don't get galvanic corrosion.

  22. #19
    Join Date
    Jan 2016
    Country
    UNITED STATES
    State/Province
    California
    Posts
    183
    Post Thanks / Like
    Likes (Given)
    29
    Likes (Received)
    94

    Default

    Quote Originally Posted by mhajicek View Post
    Use steel for your subplate so you don't get galvanic corrosion.
    Anodizing should also work, I think? (I remember anodizing being electrically insulating.) Probably better to be hard anodized so it's a little more resistant to scratching when the subplate gets mounted.

  23. #20
    Join Date
    Oct 2009
    Location
    Oregon
    Posts
    6,165
    Post Thanks / Like
    Likes (Given)
    6599
    Likes (Received)
    3491

    Default

    Quote Originally Posted by trochoidalpath View Post
    Anodizing should also work, I think? (I remember anodizing being electrically insulating.) Probably better to be hard anodized so it's a little more resistant to scratching when the subplate gets mounted.
    Type 3 is great, but the trick is it adds about .0015" to .002" to all surfaces.

    I have been using Slide no rust to stop the corrosion under aluminum subplates and it seems to work.


Tags for this Thread

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
  •