Test (Construction...)

OS = VISTA Pro pack2

1. Grbl82Mega2560

Speed ​​limits of Grbl-0.82 was measured on a board Mega2560, no connection on board.

Motors driving the axes X, Y, Z, C have 200 steps/revolution with microsteps 1/2 (400 µsteps/revolution).

X, Y, Z are screws with a pitch of 4 mm (1 stepper motor = 0.01 mm).

C is a rotary table with a ratio of 1/90 whose input shaft is driven by a motor driving (1 stepper motor = 0.01 deg)

Current settings of Grbl-0.82 :

• $VERSION = 0.82
• $0 = 100.00 (steps/mm x)
• $1 = 100.00 (steps/mm y)
• $2 = 100.00 (steps/mm z)
• $3 = 100.00 (steps/deg. c)
• $4 = 20 (microseconds step pulse)
• $5 = 750.00 (mm/min default feed rate)
• $6 = 1500.00 (mm/min default seek rate)
• $7 = 0.10 (mm/arc segment)
• $8 = 255 (step port invert mask. binary = 11111111)
• $9 = 0 (step port invert mask limit. binary = 00000000)
• $10 = 75.00 (acceleration in mm/sec^2)
• $11 = 0.05 (cornering junction deviation in mm)
• $12 = 0 (PWM on Spindle: 0 = disabled, 1 = enabled)
• $13 = 300.00 (default spindle speed in RPM)
• $14 = 1000.00 (maximum spindle speed in RPM)
• $1000 = 1 (steppers: 0 = disabled, 1 = enabled)

Measurement of speed limits on the number of axes

The commands used on successive images:

• 1- g01 f18000 x10000 -> F = 30 kHz (seems up because there after malfunctions)
• 2- g01 f18000 x10000 y10000 -> F = 21 kHz
• 3- g01 f18000 x10000 y10000 z10000 -> F = 17 kHz
• 4- g01 f18000 x10000 y10000 z10000 c10000 -> F = 15 kHz