Quote Originally Posted by harpo99999 View Post
it has been said that the peachy uses AM signal modulation, so probably does have an agc circuit after the band pass filter(s) for switching on and off of the laser.
I do have some concerns about absolute printed dimensions in relation to the designed dimensions i.e. will the peachy output dimensions exactly match the design input dimensions. Since the base level Peachy is analogue, calibration becomes critical. It's no good printing a set of gears, if the dimensions are out, they wont mesh !!!! There are a lot of variables and the software will have to be quite clever to calibrate against mirror angle. A small change in the mirror angle when the beam is at a large deflection represents a much larger dimension than when the beam is vertical to the surface. So deflections will have to be progressively mathematically weighted (a reduction) as the deflection increases. I presume it is this factor which has dictated that all the example prints so far have had small deflections (small x and y). It's quite a complicated bit of maths to do the off axis deflection compensation to maintain absolute dimensions.