Delta Rod length needs to be measured and most important is that all rods are as close to the same length as you can get them.
You need to anchor your dimensions in the real world and delta rod length is the one dimension you can measure accurately. All the other dimensions are much trickier to measure
As well the other 3 (DELTA_SMOOTH_ROD_OFFSET, DELTA_EFFECTOR_OFFSET and DELTA_CARRIAGE_OFFSET) are combined into one measurement (delta radius) and are never used again.
If you are using the magnetic ball joints with the balls on the carriages and cups on the rods then fit a ball on each end of the rod and measure overall length from ball to ball and deduct 1x ball diameter.
The dimension you want to measure is the distance between the centres of the balls.
Once you've got things moving you then need to adjust delta_radius so that the Z height in the center of your build plate matches the Z height near the edge in front of the towers.
Since DELTA_RADIUS is calculated you actually need to adjust one of the DELTA_SMOOTH_ROD_OFFSET, DELTA_EFFECTOR_OFFSET or DELTA_CARRIAGE_OFFSET
It doesn't matter which one you adjust but choose one, make a change and check the Z again.MAKE NOTES as you go.
The values you start with are the theoretical values but it's not unusual to have to adjust them by a few mm to get the the Z-plane flat.
Automated bed levelling can compensate for a lot of this error. I think for best results you should have the printer calibrated reasonably well before the bed levelling.
Regards,
Mike P
You need to anchor your dimensions in the real world and delta rod length is the one dimension you can measure accurately. All the other dimensions are much trickier to measure
As well the other 3 (DELTA_SMOOTH_ROD_OFFSET, DELTA_EFFECTOR_OFFSET and DELTA_CARRIAGE_OFFSET) are combined into one measurement (delta radius) and are never used again.
If you are using the magnetic ball joints with the balls on the carriages and cups on the rods then fit a ball on each end of the rod and measure overall length from ball to ball and deduct 1x ball diameter.
The dimension you want to measure is the distance between the centres of the balls.
Once you've got things moving you then need to adjust delta_radius so that the Z height in the center of your build plate matches the Z height near the edge in front of the towers.
Since DELTA_RADIUS is calculated you actually need to adjust one of the DELTA_SMOOTH_ROD_OFFSET, DELTA_EFFECTOR_OFFSET or DELTA_CARRIAGE_OFFSET
It doesn't matter which one you adjust but choose one, make a change and check the Z again.MAKE NOTES as you go.
The values you start with are the theoretical values but it's not unusual to have to adjust them by a few mm to get the the Z-plane flat.
Automated bed levelling can compensate for a lot of this error. I think for best results you should have the printer calibrated reasonably well before the bed levelling.
Regards,
Mike P