531,941 active members*
1,660 visitors online*
Register for free
Login
Results 1 to 8 of 8
  1. #1

    Linear Rail Mounting Flatness

    Hello,

    Is it possible to achieve flatness necessary for mounting linear ways with a vertical mill? Or must these surfaces be ground or scraped in?

    Application is a hobby 3 axis vertical mill. Not particularly crazy accuracy requirements. Looking through HIWIN manuals they spec a pretty tight flatness requirement. Wondering how critical this really is for accuracy of the ways.

  2. #2
    Registered
    Join Date
    Jan 2009
    Posts
    17

    Re: Linear Rail Mounting Flatness

    Go to youtube and look up CNC4XR7. He has some videos where he installed some linear rails on a PM727 benchtop mill.

  3. #3

    Re: Linear Rail Mounting Flatness

    Definitely a good resource to watch. Thanks of the recommendation.

    Another question that came up: Looks like Normal (C) precision rails have a height accuracy of about 3 thou. This seems like a pretty big tolerance to me. Seems like I should be looking for the High (H) precision rails, however most places I see them for sale online only sell the standard (im assuming this means Normal) precision. Anyone have any input on this?

  4. #4
    Member
    Join Date
    Jan 2005
    Posts
    11662

    Re: Linear Rail Mounting Flatness

    Quote Originally Posted by Tinycafe1972 View Post
    Hello,

    Is it possible to achieve flatness necessary for mounting linear ways with a vertical mill? Or must these surfaces be ground or scraped in?

    Application is a hobby 3 axis vertical mill. Not particularly crazy accuracy requirements. Looking through HIWIN manuals they spec a pretty tight flatness requirement. Wondering how critical this really is for accuracy of the ways.
    Yes a good quality Mill can machine the required flatness needed for mounting linear rails deburring and stoning is all that is needed after machining, yes you can Grind and scrap them also, this does not always mean that you end up with a better flatness of the machined area
    Mactec54

  5. #5
    Member
    Join Date
    Jan 2005
    Posts
    11662

    Re: Linear Rail Mounting Flatness

    Quote Originally Posted by Tinycafe1972 View Post
    Definitely a good resource to watch. Thanks of the recommendation.

    Another question that came up: Looks like Normal (C) precision rails have a height accuracy of about 3 thou. This seems like a pretty big tolerance to me. Seems like I should be looking for the High (H) precision rails, however most places I see them for sale online only sell the standard (im assuming this means Normal) precision. Anyone have any input on this?
    Height of the Rails is unimportant it's the overall height of the Bearings that is important when installed, I usually match Grind the top of the Bearings if there is a mismatch more than the Bearing tolerance is allowed
    Mactec54

  6. #6

    Re: Linear Rail Mounting Flatness

    Quote Originally Posted by mactec54 View Post
    Height of the Rails is unimportant it's the overall height of the Bearings that is important when installed, I usually match Grind the top of the Bearings if there is a mismatch more than the Bearing tolerance is allowed
    How do you grind the top of the bearings? Do you measure the difference in height then remove the bearing and grind?

  7. #7
    Member
    Join Date
    Jan 2005
    Posts
    11662

    Re: Linear Rail Mounting Flatness

    Quote Originally Posted by Tinycafe1972 View Post
    How do you grind the top of the bearings? Do you measure the difference in height then remove the bearing and grind?
    Correct in most cases they are in tolerance, if you are looking for perfect then you match grind them
    Mactec54

  8. #8
    Member
    Join Date
    Feb 2020
    Posts
    11
    I recommend you watch This Old Tony's build thread.

    https://www.youtube.com/playlist?lis...rZYL6xBIjxsDzZ

Similar Threads

  1. Linear Rail Mounting method
    By Sterob in forum T-Slot CNC building
    Replies: 3
    Last Post: 12-04-2019, 05:51 PM
  2. Side mounting methods for linear rail?
    By Stinkyz in forum DIY CNC Router Table Machines
    Replies: 5
    Last Post: 05-08-2018, 12:23 PM
  3. Linear Profile rail mounting hardware
    By jevs in forum Uncategorised WoodWorking Machines
    Replies: 0
    Last Post: 02-18-2014, 09:54 PM
  4. What Bolt's grade should be used in linear rail mounting?
    By Zaher in forum Linear and Rotary Motion
    Replies: 4
    Last Post: 06-13-2009, 08:42 AM
  5. Self leveling Epoxy for making linear rail mounting surfaces
    By mackeym in forum Linear and Rotary Motion
    Replies: 37
    Last Post: 11-10-2008, 11:31 PM

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
  •