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g0ultimaker

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  1. Hello, Some questions about jerk. I think i have got the meaning of it all right but do i also apply it correctly? Jerk speed is the instantaneous change of speed that can be made. If the jerk speed exceeds the allowable jerk speed (as in example 1 ) the speed needs to be slowed to satisfy the equation. In this situation a direction change of 30 degrees is made, a nominal speed of 60mm/s is desired but not feasible (see figure below ) exceeds jerk (20) The nozzle needs to be slowed down to 38.64 mm/s if i got my maths right and the trapezoid (of the nozzle?) should look like the figure below (speed-distance chart) Am i right or screwing up already? - But how are the x and y axis controlled, they should have different acceleration speed during their path? - Can anyone explain me how its done? Thanks.
  2. Hello, I’m doing some research on Cura with my Ultimaker2 momentarily on how it calculates the amount of extrudate, E-values. I saw a topic on extrudable.me about how to calculate the difference between the expected volume and the extruded volume. http://www.extrudable.me/2013/11/03/slic3r-strange-defaults-causing-qu-bd-woes/ But if a do so the expected and extruded volumes don’t match up (see figure). What am I doing wrong? The g-code is some lines from: UM2 - Extrusion Test - NoRet - 3-10mm3.gcode With I belief a width of 0,4 mm (nozzle size) and a layer height of 0,25mm. My formulas are in yellow. Can anyone explain where the difference comes from?
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