Lateral wheels?

New Home Forum LowRider Advice – LowRider Lateral wheels?

This topic contains 5 replies, has 2 voices, and was last updated by  Yvan256 1 month, 2 weeks ago.

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #54992

    Yvan256
    Participant

    I’m looking at all the plans, photos and parts and I can’t seem to find how the CNC stays “centered” on the table/bed. Shouldn’t there be wheels or bearings on the side parts to keep it from moving left-right?

    #55012

    Ryan
    Keymaster

    Why would it move left to right?

    #55013

    Ryan
    Keymaster

    All the wheels should be pointed in the same direction and only move in that direction. If for some reason your build has an issue the Z rails can act as a guide. If you follow the getting started guide and start the machine square, and pre drive your entire job length you should have no issues with this.

    #55015

    Yvan256
    Participant

    The wheels may only move in one direction, but what about drift? Nothing seems to prevent the machine from drifting left or right, cutting in the X-axis will push the machine horizontally.

    https://printrbot.com/wp-content/uploads/2014/10/Crawlbot-Electronics.jpg

    If you see on the crawlbot there is two sets of three bearings on each side that roll against the side of the table, to prevent such movement.

    Or are you saying that LowRider relies on wheel friction alone to prevent such drift?

    #55016

    Ryan
    Keymaster

    Yes, correct CAM has very little forces on the machine. If you want to use guides like that your table will have to be built with extremely good tolerances. Trust me it is easier to roll in a straight line than build two perpendicular edges 5′ apart. With a perfect table that is the best way, with a really good table the best way would be 1 guide wheel as to not over constrain the system. 4 wheels do a very good job of not moving, 8 even better.

    It is harder than you think to slide 1 wheel across a table.

    #55018

    Yvan256
    Participant

    Alright, thank you for the information.

    I’ve started printing the “standoff” parts yesterday so I still have some way to go before I can start assembling my LowRider.

    Thanks again for all your excellent designs and sharing them with the world.

    1 user thanked author for this post.
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