calculating crosshatch for honing cilinder

[watahyahknow]

hello i like to build a honing machine using steppermotors to rotate the hone and move the carriage so the hone moves down and up in the cilinderbore

does anyone has the calculation i need to get the correct crosshatch angle at the different bore sizes and diferences in strokelength
the numbers i like to find out is the rpm needed on the hone and the stroke in distance per minute for the down and up motion
both steppermotors with have an encoder (leadshine closed loop )

[tblough]

If you consider each scratch to be a helix, then what you are looking for is essentially the thread lead angle. "Crosshatch" angle would be twice the thread lead angle.

http://www.mitsubishicarbide.com/en/tec ... ng_formula

[cncian]

does anyone has the calculation i need to get the correct crosshatch angle at the different bore sizes and diferences in strokelength
the numbers i like to find out is the rpm needed on the hone and the stroke in distance per minute for the down and up motion
both steppermotors with have an encoder (leadshine closed loop )

Code: Select all

rpm = (60 * Fa) / (PI * D * tan(alpha / 2))

where:
  rpm = honing head's rotational speed
  Fa = axial feedrate (or up-down stroke) [measured in ipm]
  PI = 3.14
  D = bore diameter [measured in inches]
  alpha = crosshatch angle [measured in radians]

If you are using the above formula in a macro or program for Centroid's CNC12 software, then the angle above should be entered in degrees, not radians.

Stay safe!