Rotary delta calibration not implemented?

Orang_

@dc42 said in Rotary delta calibration not implemented?:

Do you know which parameters of your machine are likely to be accurate, and which need to be calibrated?
Another issue may be available memory. The RAM needed to do the calculation goes up as the square of the number of parameters to be calibrated. Nine is OK because that's the maximum supported on linear delta printers.

M669 K10 U169.85 L320 R55.94 A-45:52 H432 X-60,Y60,Z180
U, L, - maybe accurate enough to measure;
R,H - within a small margin of error
A - it is difficult to measure without special tools
x y z - depends on the construction of the printer

Orang_

@dc42
"Another issue may be available memory. The RAM needed to do the calculation goes up as the square of the number of parameters to be calibrated. Nine is OK because that's the maximum supported on linear delta printers."

is it possible in the future to add support for spi or i2c external ram?
or is it easier to buy a board with more memory?

dc42

@Orang_ said in Rotary delta calibration not implemented?:

is it possible in the future to add support for spi or i2c external ram?

No.

or is it easier to buy a board with more memory?

Yes, such as the Duet 3 MB6HC or Duet 3 Mini.

Orang_

@dc42
Why doesn't the G30 work in any way? I can't properly measure multiple points(

dc42

@Orang_ said in Rotary delta calibration not implemented?:

@dc42
Why doesn't the G30 work in any way? I can't properly measure multiple points(

Because the auto calibration code has to be written to suit the kinematics, even though the basic principle will be the same as for a linear delta. We may also need a more sophisticated way of configuring which parameters are to be calibrated, rather than just having a # of parameters as we do for linear delta.

My guess is that the homing switch positions and delta radius are the most important to calibrate. Do you agree?

Orang_

@dc42
"My guess is that the homing switch positions and delta radius are the most important to calibrate. Do you agree?" - Yes, you're right.

Orang_

@dc42 you didn't do any "calibration"?

dc42

@Orang_ said in Rotary delta calibration not implemented?:

@dc42 you didn't do any "calibration"?

I don't have a rotary delta. I implemented the kinematics for a user who had one.

Orang_

@dc42 And thank you for that.

Orang_

@dc42 do you happen to know this user?

dc42

@Orang_ said in Rotary delta calibration not implemented?:

@dc42 do you happen to know this user?

If you enter rotary delta in the search box for this forum, you will find his posts.

I will add calibration for rotary deltas to the firmware wishlist.

Orang_

@dc42 said in Rotary delta calibration not implemented?:

I will add calibration for rotary deltas to the firmware wishlist.

Thanks