In [3]:

    

import math

"""
Calculation for max speed on DigiRound
"""
inch2mm          = 25.4  # mm/inch
bpp              = 4.0   # bit/px

def speedCalc(cups_speed, printing_speed, substrate_size, turn_time, printhead_dpi):
  """
  speedCalc, calculated the theoretical speed of a machine with the given settings
 
  :param cups_speed: mechanical max of [cups/min]
  :param printing_speed: max printing speed of Calmar system [mm/s]
  :param substrate_size: 2-dim array [w,h] of the subrate size in [mm]
  :param turn_time: time for loading new cup (in digiround turn mechanism) in [seconds], rotate and new indexing
  :param printhead_dpi: dpi of a printhead [dpi]
  """
  inch2mm          = 25.4  # mm/inch
  bpp              = 4.0   # bit/px

  # cup speed
  cup_speed_sec = cups_speed / 60 # cup/sec
  cup_cycle     = 1/cup_speed_sec # sec
  
  # print speed
  print_time = substrate_size[0] / printing_speed # sec
  print_cycle   = turn_time + print_time # sec

  # image size
  pixel_pitch   = inch2mm / printhead_dpi # mm
  image_size_px = [int(math.ceil(substrate_size[0]/pixel_pitch)), int(math.ceil(substrate_size[1]/pixel_pitch))]
  
  # image data size per image
  image_size_bytes = (image_size_px[0]*image_size_px[1])*bpp/8 # bytes
  
  # Print all results
  print("cup_speed_sec           = {:.3f} cup/sec".format(cup_speed_sec))
  print("cup_cycle               = {:.3f} ms (Mechanic Maximum)".format(cup_cycle*1000))
  print("print_time              = {:.3f} ms".format(print_time*1000))
  print("print_cycle             = {:.3f} ms".format(print_cycle*1000))
  print("image_size_px (x : y)   = ( {}px : {}px )".format(image_size_px[0], image_size_px[1]))
  print("image_size_bytes        = {:.3f} MB".format(image_size_bytes/1024/1024))


    

In [4]:

    

cups_speed       = 217.0 # cups/min
printing_speed   = 850.0 # mm/s
substrate_size   = [280.0, 140.0] # mm [w, h]

turn_time        = 0.1   # sec
printhead_dpi    = 360.0 # dpi

speedCalc(cups_speed, printing_speed, substrate_size, turn_time, printhead_dpi)


    

    




cup_speed_sec           = 3.617 cup/sec
cup_cycle               = 276.498 ms (Mechanic Maximum)
print_time              = 329.412 ms
print_cycle             = 429.412 ms
image_size_px (x : y)   = ( 3969px : 1985px )
image_size_bytes        = 3.757 MB