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IndustryArena Forum > Events, Product Announcements Etc > Polls > Best Gantry Linear Rail Configuration ?

View Poll Results: What is your preferred Gantry Rail Config?

Voters
4. You may not vote on this poll
  • 1

    1 25.00%
  • 2

    1 25.00%
  • 3

    1 25.00%
  • 4

    0 0%
  • 5

    0 0%
  • 6

    1 25.00%
Multiple Choice Poll.
Results 1 to 7 of 7

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  1. #1
    Join Date
    Apr 2020
    Posts
    50

    Best Gantry Linear Rail Configuration ?


  2. #2
    Join Date
    Apr 2020
    Posts
    50

    Re: Best Gantry Linear Rail Configuration ?

    Interesting..
    280+ views and no opinions on what would be the better gantry rail configuration.
    Maybe I made the question to hard or confusing..

  3. #3
    Join Date
    Sep 2005
    Posts
    1195

    Re: Best Gantry Linear Rail Configuration ?

    I use no. 4 design on all my cnc router based on force work vertically or horizontally ...

  4. #4
    Join Date
    Jan 2008
    Posts
    1523

    Re: Best Gantry Linear Rail Configuration ?

    There is no "best" in machine design.

    Ever decision is a compromise.

    4/5/6 have advantage in resisting torsion. Downsides include more difficult to machine and align. And you have to make sure the carriage mounted to bearings is appropriately rigid.
    7xCNC.com - CNC info for the minilathe (7x10, 7x12, 7x14, 7x16)

  5. #5
    Join Date
    Aug 2015
    Posts
    142

    Re: Best Gantry Linear Rail Configuration ?

    Interesting point with torsion , but why 3 is not better tan 3 or 4 , why in industrial machines there is aproximatley all time used 3 ? How can be more resistant to torsion 456 than 3 or 2 or 1 ? Because there are same dinamic range , and same boxes .

  6. #6
    Join Date
    Apr 2020
    Posts
    50

    Re: Best Gantry Linear Rail Configuration ?

    Thanks for your feedback

  7. #7
    Join Date
    Jul 2018
    Posts
    6254

    Re: Best Gantry Linear Rail Configuration ?

    1) Is good because the "crank centre ie the line of action of the resulting car reaction moment" is through the shear centre of the section so will resist torsion well. Its bad because its harder to machine opposing surfaces and the rails are mounted on "air" so they can vibrate
    2) Same reasons as 1) but now they are mounted on long thin surfaces so will vibrate worse. Plus the forward car makes the stack height of the Z more then 1)
    3) common arrangement easy to machine rail lands. Poor because the crank centre is not through the shear centre so resisting torsion and bending is not efficient
    4) & 5) not easy to machine lands, no advantage in Z stack,
    6) rails on edges is better then in middles of flats, crank center is near shear centre. Move bottom rail to bottom of section, near fwd edge and it will be better again as the rails are then furthest apart. Peter

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