Standard linear motion conversion to linear rails.


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Thread: Standard linear motion conversion to linear rails.

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    Default Standard linear motion conversion to linear rails.

    I've converted from the CNC Router Parts standard linear motion to linear rails and bearing blocks.

    I had a friend mill up two 1" aluminum interface plates that I used to attach the linear bearing blocks to the gantry uprights.
    Standard linear motion conversion to linear rails.-20180611_185747-jpg

    Standard linear motion conversion to linear rails.-20180611_185958-jpg

    Standard linear motion conversion to linear rails.-20180611_190008-jpg

    Once the bearing blocks were mounted to the interface plates and the linear rails were installed, I worked on one side at a time. I removed the bolts holding the gantry upright to the CNC Router Parts linear bearing carriages and then removing the cold rolled steel.

    Installed the new linear rail, slide the interface plate on and bolted it to the gantry upright.

    Standard linear motion conversion to linear rails.-20180613_202707-jpg

    I was also able to move the gear rack up to the top slot on the 80/20 1530 extrusion.

    Standard linear motion conversion to linear rails.-20180617_134835-jpg

    Two things I neglected to consider...

    •The rail stops were too short and had to be redesigned.
    •The tensioning bracket wasn't supported. I ended up fabbing a new mount from angle iron.

    Standard linear motion conversion to linear rails.-20180615_164730-jpg

    Standard linear motion conversion to linear rails.-20180617_134623-jpg

    Standard linear motion conversion to linear rails.-20180619_183120-jpg


    One benefit of doing this conversion is that I gained an additional 1 1/4" under the gantry.

    I used BLH25F bearing blocks and BLH25Rxxxx linear rail from Automation Overstock.

    Happy to answer any questions!

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    Default Re: Standard linear motion conversion to linear rails.

    did you convert both the x & y axis? how's it done on the Y axis? thanks



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    Default Re: Standard linear motion conversion to linear rails.

    I haven't done the Y axis yet.

    The standard CNC Router Parts setup has 2 - 2 1/2" pieces of cold rolled steel, top and bottom. I used one piece of 7" to increase rigidity and haven't quite figured out how to switch over to linear rails and still keep the 7" plate.



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    Default Re: Standard linear motion conversion to linear rails.

    What issues did you have with the standard set up that made you want to do this?



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    Default

    Quote Originally Posted by tkms002 View Post
    What issues did you have with the standard set up that made you want to do this?
    I wasn't having any issues, it seemed to be working fine.

    That said, I've seen improvements in the quality of cut since the switch.



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    Default Re: Standard linear motion conversion to linear rails.

    I am hoping to see some cut quality improvements, and rigidity improvements.



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    Default Re: Standard linear motion conversion to linear rails.

    Quote Originally Posted by bobmagnuson View Post
    I used one piece of 7" to increase rigidity and haven't quite figured out how to switch over to linear rails and still keep the 7" plate.
    Leave the 7inch plate in place and add the linear rail on top of it.



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    Default Re: Standard linear motion conversion to linear rails.

    Quote Originally Posted by nlancaster View Post
    I am hoping to see some cut quality improvements, and rigidity improvements.
    What causes a lack of rigidity using the CNCRP skate bearing set up? If the bearings are properly tightened, where is the issue?
    Newbe here. Just trying to figure this out.
    Thanks



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    Default Re: Standard linear motion conversion to linear rails.

    When skate bearings are used like that, the outer race can flex. Linear bearings can carry thousands of pounds without deforming, which would destroy skate bearings
    Then there's the issue with flatness and consistency of thickness. The tighter they are, the more susceptible they are to binding due to thickness variation or unevenness.

    Gerry

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    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


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    Default Re: Standard linear motion conversion to linear rails.

    Yeah, you can only tighten the skate bearings just so much.



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    Default Re: Standard linear motion conversion to linear rails.

    How much for a set of plates? I’m building a new machine based off the standard plans.



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Standard linear motion conversion to linear rails.

Standard linear motion conversion to linear rails.