x gantry guides

New Home Forum LowRider Advice – LowRider x gantry guides

This topic contains 8 replies, has 5 voices, and was last updated by  Phil Brooks 4 months, 4 weeks ago.

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  • #103827

    Phil Brooks
    Participant

    I’ve not yet built a LowRider, but it’s definitely under consideration.  But, there is something I don’t understand.  What keeps the x-gantry from resisting side to side movement?  I obviously see the roller wheels the assembly moves on, but are there other guide wheels that press against the side of the table that keeps the gantry running parallel to the table?  I’ve looked at lots of pictures and I’m drawing a blank!  Feel silly asking the question!

    Thanks!

    Phil

     

    #103828

    Mike Atencio
    Participant

    Don’t feel silly. That’s a great question.

    #103840

    Jeffeb3
    Participant

    The motors move in lockstep, but otherwise there is nothing. Some people have carved grooves for the wheels to ride in. I installed some 3/4″x3/4″ strips to make the wheels ride straight but some people haven’t needed them.

    #103843

    Phil Brooks
    Participant

    Interesting!  I understand about the two motors stepping together.. but it seems odd (at least to me) that there isn’t something to prevent side motion.  I’ve not worked with routers before, but I would have thought that when it’s cutting left or right it would be pushing on the gantry in the opposite direction.  I’ve looked at a lot of table routers and most are more “industrial” with with linear rails, rods, or extrusions with slots.  Apparently the forces aren’t high enough to affect the operation!

    However, I’ll certainly be tempted to add some kind of side “guides” when I build mine!!

    Thanks for the answer!

    Phil

     

    #103865

    Ryan
    Keymaster

    Apparently the forces aren’t high enough to affect the operation!

    Exactly. Version1…V1…had extra wheels, we didn’t need to so I took them away. The machine is easily a few pounds and then rails, if you put 5lbs of force on a router that is plenty. I quote it a lot but the cuts I do in aluminum trend to have a calc force of way under 2kg at the bit so wood is far less.

    #103866

    Ryan
    Keymaster

    I guess another way to put it is 4 of those wheels have enough traction to keep an adult from sliding a router is nothing.

    1 user thanked author for this post.
    #103893

    Phil Brooks
    Participant

    Thanks Ryan, it is counter intuitive on the face of it, but a good lesson in not over designing!

     

     

    #103896

    Erwin Vigilia
    Participant

    Google “Static Coefficient of Friction”. I slept during my Statics and Dynamics class, most EEs do and lots of instituions don’t even require that class anymore… tells you how old I am. 🙂

     

     

     

    #103944

    Phil Brooks
    Participant

    There was no such thing as ” Statics and Dynamics class” when I went to college.  That tells you how old I am!!   I will look up “static coefficient of friction” though!

     

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