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Tramming Mount

Discussion in 'General Talk' started by Rink, Aug 23, 2022.

  1. Rink

    Rink Well-Known
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    Good afternoon.
    Has anyone designed and/or manufactured and used their own "after market" spindle/router mount that provides an easier method of tramming the spindle in both axes? (both left/right and front/back).

    Thx, rink.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    The reason doesn't really exist is that adjusting the router mount fixes the angle of the router - but does nothing to correct the axis of motion (far more important)

    The now upright router still enters the material at an angle as the Z axis plunges at an angle, because (for example) the Z uprights were installed skew.

    See Tramming: A generic guideline

    Fix the problem, not the symptom :)
     
  3. Rink

    Rink Well-Known
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    Hey, Peter, thank you.

    Yes, sir, I do understand the difference between the X/Y axes of motion vs. the alignment of the vertical axis of the router.

    Of course, first priority is to ensure the X/Y axes of motion are aligned correctly. And even if those aren’t perfect, but very close, it should be OK if you surface the spoil board to be parallel with those X and Y planes.

    But even if those planes are aligned perfectly, the vertical axis of the router could be off, correct? Either front-to-back or side-to-side?

    Your message above seems to imply that, if the X/Y axes of motion are aligned correctly, the router will automagically be aligned correctly. Did I understand? There is no slip or play in any of the screw holes or brackets that could affect the router axis independently from X/Y axes of motion?

    What am I missing? It’s something simple, isn’t it?
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Basically yes, as explained in the generic guide. The mount itself has a little left/right adjustability (but can be squared to the Z axis carriage precisely during assembly)
     
  5. Saddlebrooke

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    It would be nice if you would put out a video on this so everyone that owns an openbuilds machine would know how to do it. It is a big problem. Every other brand has videos on this subject put out by an owner or the company that made it. Not for open builds. I have not found one yet. Please do that for us so all owners are on the same page. Thanks
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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  7. Christian James

    Christian James Journeyman
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    I made something like in the link below but didn't clamp the pins just screwed them.

     
  8. Rink

    Rink Well-Known
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    Good evening.

    On my Lead 1510, my router is out of tram (not precisely vertical). It needs to “lean back” to be vertical. I found this while surfacing the spoilboard with a 1” diameter bit which left uneven passes.

    See pics…when I place a framing square on the table and against the gantry, it looks like the gantry is not square to the bed in the front-to-back direction. The square touches the top edge of the upper extrusion but there is a slight gap (about a mm or so) at the bottom edge of the lower extrusion. In other words, the gantry leans slightly forward (toward the front), confirming the results of my surfacing.

    I did follow the steps in the tramming guide, linked above, when I built the machine. But I may have referenced off the surface of the table the machine is sitting on since I didn’t have a surfaced spoilboard at that time.

    Of course I need to adjust the gantry to lean it back a bit. But how? Obviously, I could begin tearing the gantry apart, but I hate to disassemble it completely, removing motors, etc, if I don’t have to go that far.

    Anyone have a “best practice” or “the most straightforward, least complex” way of doing this? I figure I’m not the first one.

    Thx, rink.
     

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  9. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    See Tramming: A generic guideline
     
  10. Rink

    Rink Well-Known
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    Peter, good morning.

    Thanks for the quick response. Yes, you’ve provided that link earlier in this thread on 23 August 2022. As noted in my post, I’ve read it and attempted to follow it. I squared up the gantry as best I could during assembly. But now my gantry needs adjustment to be square per step three of that guide.

    As I stated in my post, the question is HOW to accomplish that adjustment. I would like to do so WITHOUT disassembling the entire gantry. But it looks like several of the screws to which I need access are inaccessible without almost complete disassembly.

    So I’m asking if anyone else has accomplished this with minimal disassembly of the gantry.

    Thx, rink.
     
  11. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Yeah some disassembly required. Easier to do while building, afterwards some fasteners are behind other parts
     
  12. Rink

    Rink Well-Known
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    Sounds like a challenge for designers. :)

    I think at that point in the build, I didn’t have a spoilboard installed to square from. So I think I used my table top.
     
  13. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    During assembly, getting the uprights square on the Y carriages is the one you probably didn't do perfectly.
    Carriages are always square to Y axis rails (fixed wheels maintain that)
    Y rails should be quite square to spoilboard (unless its built entirely wrong)

    With square uprights, the X axis rails can be installed straight by just lining up with uprights edges

    And Z is always fixed in relation to gantry beams
     

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