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Waves in waste board

Discussion in 'CNC Mills/Routers' started by WR_Rider, May 16, 2019.

  1. WR_Rider

    WR_Rider New
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    I tried to use flattening and surfacing wizard in the control software to level my waste board. It was leaving 'waves" between passes, not lips or edges. I had tried to square up the makita router as best as I could prior to using the utility. I'm using a 1" bit and only changed the bit size and outside dimensions, and cut was only 1mm deep in the setup.

    Any suggestions?
    Thanks in advance!
     
  2. Alex Chambers

    Alex Chambers Master
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    Have you got a pic you could post? Difficult to tell from your description, but the commonest cause of problems with spoiler board levelling is router/spindle alignment.
    Alex.
     
  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Agreed a pic would help confirm, but yes, to get a good level, you need the bit to be perfectly perpendicular to the movement of the axes (So if you use a square to level the router, make sure to level against the rails, not against the bed for example) - you want it to be perfectly plumb on the Z axis (ie exactly 90deg to X beam and Y beams.
     
  4. WR_Rider

    WR_Rider New
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    I didn't think this photo would show the "waves" very well but here it is. If you run your hand over the surface it feels like it has "rolling waves". I did try to use a square level to align both x, y axis's but I could only align the mount for the router. I'll check again at the bit once I get a smaller "L" level.

    Also needless to say this isn't the bit I used in the router but this is the mount I tried to square up.

    Thank you for your time.
     

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  5. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Try it again with a lesser depth of cut, say something in the 0.1mm-0.2mm range.

    The questions I have would be are the ridges parallel or perpendicular to the x-axis (can't tell from the photo) and what is the length of your X-axis?
     
  6. WR_Rider

    WR_Rider New
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    Parallel w the x axis.

    Thx
     
  7. Kevon Ritter

    Kevon Ritter Veteran
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    What I do it a 0.5mm pass as fast as it can without bogging down, then a lighter 0.2mm skim. If the load is too high, the Z axis will actually till sideways which is what introduces the valley/radius.
     
  8. Alex Chambers

    Alex Chambers Master
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    Also (you don't say what machine you are using so can't be very specific) but check for play where the X axis C beam is attached to the Y axis and play between the spindle and mount.
    Alex.
     
  9. WR_Rider

    WR_Rider New
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    Alex, it's a workbee lead screw, 750 (x axis) x1000 (y axis).
    The pattern seems too symmetrical to me to be play, but I will certainly take your advise and check.
    Thx
     

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  10. Alex Chambers

    Alex Chambers Master
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    @Kevon Ritter's advice is the most likely solution anyway but if movement is possible it can cause similar symptoms. I forgot to mention the possibility of play between the wheels and rails (adjust eccentrics).
    Alex.
     
  11. Christian James

    Christian James Journeyman
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    You're using a 1" bit but the photo shows otherwise?
    If you are using a 1" bit, there appears to be no step-over in the process which would have helped (hard to judge though from the photo to be fair) but I would suggest you use a 1/4" or 6mm bit for surfacing anyway.
     
  12. WR_Rider

    WR_Rider New
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    This was the built in surfacing feature of the control software. I left the default at 40% overlap. However, I'm not sure if that is what you mean by "step-over" or not. I was under the impression for such a large board, that most people were using 1" or larger bits to flatten the surface with.

    I can and will certainly look into all the suggestions above and if I don't find anything will try a smaller bit.

    I do appreciate all the feedback
    Thx
     
  13. Alex Chambers

    Alex Chambers Master
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    I'd stick with the 1" bit unless you have a lot of spare time (I use a 19mm router bit - too mean to buy a special bit:D) but take lighter cuts - at 1mm you are putting a lot of force onto your Z/☓ axes.
    Alex. :):):)
     
  14. WR_Rider

    WR_Rider New
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    Thanks Alex and others, will do.
    It was interesting that the default value was 3mm deep ( lowered to 1mm) but maybe it was because it only had a 6mm diameter bit as well. I will check all the other suggestions as well. The machine didn't seem to have any play but I never rechecked anything after I ran it around a bit to break it in some. There were some things on the x axis wheels I didn't really like when adjusting the eccentric spacers.
     
  15. Alex Chambers

    Alex Chambers Master
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    A crude calculation, but your 1" bit has 17 times the area of a 6mm bit. One 17th of 3mm is 0.18 mm (approx).
    Alex.
     
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