Y Axis Auto-parallel: Difference between revisions
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Y axis auto parallel involves adding a half-carriage as an extra piece to the X Axis Universal Axis. This was done from v19.02 onwards (see [[3D Printer Genealogy]] to prevent the y axes from jamming if the 2 axes are not parallel. By adding an extra half-carriage at the end of the X axis, with rods of the X Axis inside this half carriage - we are allowing the X axis to slide in and out of the Y2 axis (Y1 axis attachment point is fixed). This constrains the X axis at the Y2 Axis in the Y direction, but does not constrain the X axis at the Y2 Axis in the X direction - thereby preventing any jamming due to the distance between the Y1 and Y2 axis not being the same. | Y axis auto parallel involves adding a half-carriage as an extra piece to the X Axis Universal Axis. This was done from v19.02 onwards (see [[3D Printer Genealogy]] to prevent the y axes from jamming if the 2 axes are not parallel. By adding an extra half-carriage at the end of the X axis, with rods of the X Axis inside this half carriage - we are allowing the X axis to slide in and out of the Y2 axis (Y1 axis attachment point is fixed). This constrains the X axis at the Y2 Axis in the Y direction, but does not constrain the X axis at the Y2 Axis in the X direction - thereby preventing any jamming due to the distance between the Y1 and Y2 axis not being the same. | ||
When the Y1 and Y2 are not parallel, some non-parallel can be allowed as the Y axes flex. This increases motion resistance. Once the resistance is high enough - the stepper motors cannot overcome it and motion jams, resulting in layer shifts. Additional resistance occurs as soon as the non-parallel is as small as the thickness of a sheet of paper - about 100 microns or 4 thousandths of an inch. The point of this is that it's not possible to achieve this level of accuracy using welded frames, and thus performance would always be suboptimal. For this reason, we have added the auto-paralleling mechanism. | When the Y1 and Y2 are not parallel, some non-parallel can be allowed as the Y axes flex. This increases motion resistance. Once the resistance is high enough - the stepper motors cannot overcome it and motion jams, resulting in layer shifts. Additional resistance occurs as soon as the non-parallel is as small as the thickness of a sheet of paper - about 100 microns or 4 thousandths of an inch. The point of this is that it's not possible to achieve this level of accuracy using welded frames, and thus performance would always be suboptimal - some other part of the printer has to take up the resistance by deforming or creating more friction. For this reason, we have added the auto-paralleling mechanism. | ||
Download the CAD from [[D3D_v19.06]] to look at the details of the X axis to see how it is constructed with the half-carriege next to the idler side of the axis. If this is not clear in the CAD, the CAD should be updated. | |||
Revision as of 17:28, 2 September 2019
Y axis auto parallel involves adding a half-carriage as an extra piece to the X Axis Universal Axis. This was done from v19.02 onwards (see 3D Printer Genealogy to prevent the y axes from jamming if the 2 axes are not parallel. By adding an extra half-carriage at the end of the X axis, with rods of the X Axis inside this half carriage - we are allowing the X axis to slide in and out of the Y2 axis (Y1 axis attachment point is fixed). This constrains the X axis at the Y2 Axis in the Y direction, but does not constrain the X axis at the Y2 Axis in the X direction - thereby preventing any jamming due to the distance between the Y1 and Y2 axis not being the same.
When the Y1 and Y2 are not parallel, some non-parallel can be allowed as the Y axes flex. This increases motion resistance. Once the resistance is high enough - the stepper motors cannot overcome it and motion jams, resulting in layer shifts. Additional resistance occurs as soon as the non-parallel is as small as the thickness of a sheet of paper - about 100 microns or 4 thousandths of an inch. The point of this is that it's not possible to achieve this level of accuracy using welded frames, and thus performance would always be suboptimal - some other part of the printer has to take up the resistance by deforming or creating more friction. For this reason, we have added the auto-paralleling mechanism.
Download the CAD from D3D_v19.06 to look at the details of the X axis to see how it is constructed with the half-carriege next to the idler side of the axis. If this is not clear in the CAD, the CAD should be updated.