New Machine Build 18x18 Linear Rail Tormach Build.


Page 1 of 82 12341151 ... LastLast
Results 1 to 12 of 980

Thread: 18x18 Linear Rail Tormach Build.

  1. #1
    Registered nateman_doo's Avatar
    Join Date
    Jun 2010
    Location
    USA
    Posts
    1392
    Downloads
    0
    Uploads
    0

    Lightbulb 18x18 Linear Rail Tormach Build.

    Its been a while since I have been here so I figured I would start posting some pics of the linear rail machine I have been building. Maybe with some motivation (and input) from the community I can finally finish this build I have been working on for what feels like years.

    The frame for the machine is 4 x 4 feet. The actual table will be 4 feet wide by 3 feet deep.

    I used 3" aluminum I beams (which I just found out are warped) and some 8020 2x4 main beam which I filled with four pieces of 0.5" rebar and 10 lbs of concrete poured in there. It feels like it weighs 50 lbs now and seems unearthly rigid. There will be somewhere on order of 1000 lbs on the table, so I think it will hold up pretty well. Each leg will support 250 lbs, and the rear 8020 which is anchored to the foundation will support the other 500 lbs.

    Here is the basic frame:
    18x18 Linear Rail Tormach Build.-mill-table-050-jpg
    18x18 Linear Rail Tormach Build.-mill-table-051-jpg
    I made some custom Gusset plates for the 2040 because I couldn't find any anywhere. Let me know and i will post the DXF if anyone wants it.

    Unfortunately I found out that the I beams are warped:
    18x18 Linear Rail Tormach Build.-mill-table-058-jpg

    I put them down on a granite surface plate and put a level on top of them to show the company I purchased them from how messed up the lot was. They intend to file a claim with the carrier saying it was warped in transit. I just don't see the old UPS guy bending I-beams all Hulkamania style since he is to lazy to even take them to my front door. New ones should be on the way, so the company did OK in my book.

    Here is the layer of wood which will be the "underlayment" for a concrete pour:
    18x18 Linear Rail Tormach Build.-mill-table-053-jpg
    1.5" of MDF (which will be waterproofed). A 2x8 frame will be boxed around to hold the 10 or so bags of concrete and probably a few threaded rods to keep the generally square shape. 800 lbs should do a wonderful job of dampening for the relatively light machine work that I do.

    Feel free to SUBSCRIBE to the thread and watch me learn all my lessons the hard way.

    Similar Threads:


  2. #2
    Registered
    Join Date
    Jan 2006
    Location
    USA
    Posts
    2985
    Downloads
    0
    Uploads
    0

    Default

    Could you shim the i beams at the bottom to get them close and then skim the top once the machine is running to get it true?

    Looks like a beefy build
    Matt



  3. #3
    Member
    Join Date
    Feb 2006
    Location
    USA
    Posts
    7087
    Downloads
    0
    Uploads
    0

    Default

    ANY extruded aluminum piece is going to have very significant dimensional variation, and the larger it is the larger the variation. Things like I-beams are never intended to be "precision" components. If your design depends on the beams being dead-straight, then you've got a serious problem. You will also see VERY significant dimensional variation with changes in temperature, as aluminum has a very high coefficient of thermal expansion, and will expand, and contract, and twist all over the place, even with relatively small changes in ambient temperature.

    Regards,
    Ray L.



  4. #4
    Registered
    Join Date
    Jan 2010
    Location
    usa
    Posts
    485
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by HimyKabibble View Post
    ANY extruded aluminum piece is going to have very significant dimensional variation, and the larger it is the larger the variation. Things like I-beams are never intended to be "precision" components. If your design depends on the beams being dead-straight, then you've got a serious problem. You will also see VERY significant dimensional variation with changes in temperature, as aluminum has a very high coefficient of thermal expansion, and will expand, and contract, and twist all over the place, even with relatively small changes in ambient temperature.

    Regards,
    Ray L.
    Not to mention that they are not good from a "torsion resistant" point of view.



  5. #5
    Member FannBlade's Avatar
    Join Date
    Jun 2011
    Location
    USA
    Posts
    687
    Downloads
    0
    Uploads
    0

    Default

    I will be watching. I love these types of builds.



  6. #6
    Registered nateman_doo's Avatar
    Join Date
    Jun 2010
    Location
    USA
    Posts
    1392
    Downloads
    0
    Uploads
    0

    Default

    Thanks! I wasn't looking for "precision" I-beams, just something I didn't have to over torque screws from the I beam into the wood. I was hoping they would sit flat, and cost less then more 8020 extrusions. The only decent priced extrusions that came in bulk were 40x40mm.

    I have most of the table completed, but I still need a way to figure out the motor mount/ball screw/dbl nut situation.



  7. #7
    Registered nateman_doo's Avatar
    Join Date
    Jun 2010
    Location
    USA
    Posts
    1392
    Downloads
    0
    Uploads
    0

    Default

    While waiting for the new I-beams I did some leveling, and replaced the slotted screwdriver bolts with socket cap screws:
    18x18 Linear Rail Tormach Build.-mill-table-064-jpg

    The leveling results:
    Front
    18x18 Linear Rail Tormach Build.-mill-table-063-jpg

    Back:
    18x18 Linear Rail Tormach Build.-mill-table-065-jpg
    Not sure how "off" the back one is since there is no markings. Debating upon leaving well enough alone, or trying to fix that half a degree or whatever the interval off it is.



  8. #8
    Member
    Join Date
    Feb 2006
    Location
    USA
    Posts
    7087
    Downloads
    0
    Uploads
    0

    Default

    If it makes you feel any better, you'll have at least that much error (probably considerably more) front-to-back, due to thermal expansion.

    Regards,
    Ray L.



  9. #9
    Registered nateman_doo's Avatar
    Join Date
    Jun 2010
    Location
    USA
    Posts
    1392
    Downloads
    0
    Uploads
    0

    Default

    heh... thanks. The basement stays cool year round (obviously more so in the winter).

    I just figured trying to level it wouldn't be a bad place to start. I-beams should be arriving this week (I HOPE?!)



  10. #10
    Registered nateman_doo's Avatar
    Join Date
    Jun 2010
    Location
    USA
    Posts
    1392
    Downloads
    0
    Uploads
    0

    Default

    new beams arriving friday. Just in time for me to not be able to touch them over the weekend.



  11. #11
    Member
    Join Date
    Jun 2006
    Location
    USA
    Posts
    3012
    Downloads
    0
    Uploads
    0

    Default

    Interesting build approach.

    How will this be similar to the Tormach mill?

    Mike



  12. #12
    Registered nateman_doo's Avatar
    Join Date
    Jun 2010
    Location
    USA
    Posts
    1392
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by MichaelHenry View Post
    Interesting build approach.

    How will this be similar to the Tormach mill?

    Mike
    Because I am using a Tormach V770 Milling head.



Page 1 of 82 12341151 ... LastLast

Tags for this Thread

Posting Permissions

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


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

18x18 Linear Rail Tormach Build.

18x18 Linear Rail Tormach Build.

18x18 Linear Rail Tormach Build.