Galvo pincushion distortion?
Posted: Tue Feb 24, 2015 6:10 pm
I am building a mirror driven "glavo type" printer using two high res steppers and digital drivers.
My early testing has been productive however I seem to have hit a wall with a pincushion distortion error on my X axis (last mirror before surface bed).
Because it is still early I have not done any printing but did do some projections on the wall to verify the laser spot path visually and I noticed a significant amount of deviation/distortion of the spot positioning on my X axis. From my initial digging around on the web I understand that this type of error is called pincushion distortion (axis bows in like this --> )( <--).
Has anyone encountered this type of x y axis path distortion?
Looking at other laser type SLA printers, i.e Form1, they do not seem to have any reports of this type of distortion nor do they use any type of lens to correct for an error like this.
I have gone through the hardware and confirmed correct alignment of the laser and mirror axis locations and made significant adjustments in an attempt to pinpoint the cause. No luck...
With the power off to the scanner and the laser on I can manually move the x axis mirror in the x/- directions and see an arching path of the laser dot.
Any insight on this would be very helpful.
Thanks!
My early testing has been productive however I seem to have hit a wall with a pincushion distortion error on my X axis (last mirror before surface bed).
Because it is still early I have not done any printing but did do some projections on the wall to verify the laser spot path visually and I noticed a significant amount of deviation/distortion of the spot positioning on my X axis. From my initial digging around on the web I understand that this type of error is called pincushion distortion (axis bows in like this --> )( <--).
Has anyone encountered this type of x y axis path distortion?
Looking at other laser type SLA printers, i.e Form1, they do not seem to have any reports of this type of distortion nor do they use any type of lens to correct for an error like this.
I have gone through the hardware and confirmed correct alignment of the laser and mirror axis locations and made significant adjustments in an attempt to pinpoint the cause. No luck...
With the power off to the scanner and the laser on I can manually move the x axis mirror in the x/- directions and see an arching path of the laser dot.
Any insight on this would be very helpful.
Thanks!