1 Topic by RGargus

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Topic: SD3 is not perpendicular

I printed out a disk for a wind generator I am designing, and discovered that my SD3 is not completely perpendicular on all its axis.  Once the axle was in place, a tight fit, and bolted tightly, I spun the disk on bearings and found about a 1/8 in wobble in the plate, which is 3 inches in diameter.  While this is not a large amount for many things, it makes it very difficult to do anything precision.  In this case, it forces me to separate my magnet plate and my coil plate further than I had planned, reducing the effiency of the genarator.  Due to the nature of the construction of the frame, I see no means to square the unit, and will have to deal with this flaw in everything I make with it, unfortunately.
Does anyone else have this issue, and if so, how severe is it?

2 Reply by Leghk

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Re: SD3 is not perpendicular

You could give the XY calibration a shot, at wiki dot solidoodle dot com slash belt-adjustment (sorry for the pseudo-url, I haven't posted enough yet).

Don: Folger Tech 2020 Kossel Rev A + Borosilicate + Snow Effector
        Davinci 1.0 + Repetier : Filastruder
        SD3 + RAMPS + Lawsy Carriages + E3D + Borosilicate + ... : Cupcake

3 Reply by IanJohnson

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Re: SD3 is not perpendicular

Is the height of the disc (Z) different across the surface, or is it elliptical, with a difference between X and Y dimensions?

4 Reply by ronsii

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Re: SD3 is not perpendicular

All of the axis combinations could be adjusted for perpendicularity, some easier than others... So which axis's are out of square? x to y x to z or y to z

5 Reply by RGargus

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Re: SD3 is not perpendicular

ronsii wrote:

All of the axis combinations could be adjusted for perpendicularity, some easier than others... So which axis's are out of square? x to y x to z or y to z

It seems that the Z is not perpindicular to the x and y.  I can't see any way to adjust since the guide rods are held in relative position by holes drilled into the frame  By the way, this is not a warpage issue since the part stayed completely flat and stuck to the glass for the entire build.

6 Reply by RGargus

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Re: SD3 is not perpendicular

This photo shows the problem

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7 Reply by ronsii (edited by ronsii 2013-02-28 06:56:42)

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Re: SD3 is not perpendicular

Are you sure it is off in both x and y... you can adjust the x axis by moving the white bearing blocks up or down as needed. I would check the machine for square before relying on printed holes with threaded rod as an indicator....also easily accomplished by placing a machinists square or other on the bed with the vertical edge resting on the extruder motor shaft then move bed up and down but do this after the bed is leveled very good across x for checking x and leveled very good across y for checking y.

8 Reply by RGargus

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Re: SD3 is not perpendicular

ronsii wrote:

Are you sure it is off in both x and y... you can adjust the x axis by moving the white bearing blocks up or down as needed. I would check the machine for square before relying on printed holes with threaded rod as an indicator....also easily accomplished by placing a machinists square or other on the bed with the vertical edge resting on the extruder motor shaft then move bed up and down but do this after the bed is leveled very good across x for checking x and leveled very good across y for checking y.

I am only home one day of the week, so I have not been able to fully investigate the phenomenon enough to be certain of where the issue  lies.  However, since holes in parts and squareness of pieces are what I am trying to produce, the results are for me far more important than whether the frame is square or not, albiet I understand that indeed this is probably the root of the problem.

9 Reply by RGargus

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Re: SD3 is not perpendicular

While is it difficult to quntify from this photo, you can see a slight missallignment where the gap at the bottom is larger than the gap at the top.  It is not possible to put the square fully against the bar due to the clamp arrangement.

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10 Reply by ronsii

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Re: SD3 is not perpendicular

The method I listed above was to square the rods not the frame, however just the way the SD is constructed if the frame gets bent the rods will follow... from what I saw in your first picture there is a fairly large deviation for a 3 inch part if it was the frame that was bent it your printer would be wobbling at least a half inch on three legs, in the second picture you are checking the rods from the bottom sheet metal of the printer... because of the design of the printer the floor may bow down so checking the rods against this will not be accurate or useful. I think you will find that the settings will have the most impact on how the holes come out... when ever I print holes I always undersize them and ream them out afterwards.

11 Reply by RGargus

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Re: SD3 is not perpendicular

ronsii wrote:

The method I listed above was to square the rods not the frame, however just the way the SD is constructed if the frame gets bent the rods will follow... from what I saw in your first picture there is a fairly large deviation for a 3 inch part if it was the frame that was bent it your printer would be wobbling at least a half inch on three legs, in the second picture you are checking the rods from the bottom sheet metal of the printer... because of the design of the printer the floor may bow down so checking the rods against this will not be accurate or useful. I think you will find that the settings will have the most impact on how the holes come out... when ever I print holes I always undersize them and ream them out afterwards.

That would help to square them up, as my drill press is indeed perpendicular, but it would be better if my parts came out as per design without having to "fix" them.  I am printing up this test block to see if I can determine where the error is.  The design is a 50mm square and high unit with 5mm thick walls.

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12 Reply by RGargus

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Re: SD3 is not perpendicular

1 further update.  The open cube I posted, came out VERY square, and all dementions were also very close.  So, perhaps the only solution is to indeed make a smaller hole than required and drill.  I will try that but I am still dissappointed that there was as much wobble as I had, while the hole was very tight.  Anyway, it is a learning process.  Thanks for the input.

13 Reply by IanJohnson

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Re: SD3 is not perpendicular

I also ream the holes, because I haven't been able to completely remove Y backlash.  If I undersize them and then drill, they will be round.