TODO

• Set backlash: http://www.cncexpo.com/MeasuringBacklash.aspx

Controller

Was: 4 Axis CNC kit http://www.techlf.com/cnc4bu_kit.php3

Now moving to http://www.planet-cnc.com/

• CNC USB controller software license
• CNC USB controller Mk2 (9 Axis)
• Connectors for CNC USB controller
• MotorDriver 2.5A x 4
  

Mill Head

• Drilling Capacity = 13mm
• End Mill Capacity = 13mm
• Face Mill Capacity = 50mm
• Spindle Taper = MT2
• Spindle Stroke = 50mm
• Head Tilt = +/- 90 degrees
• Number of Spindle Speeds = variable
• Range of Spendle Speeds = 50~2250RPM
• T-Slot Size = 8mm
• Motor = 500W, 1Ph, 230V
• Hand Wheel Graduation 1mm (= 1mm x 50 per revolution = 50mm per revolution)

Stepper motors

• 1.8 deg. (200 steps per revolution)
• bipolar
• 4 wires
• 3 Amp / Phase
• 1.8 Nm
• Nema 23
• shaft 6.2mm d

Compound Table

• Table Size 155 x 470mm
• Longitudinal Travel 290mm (limited to 240mm due to bits in the way)
• Cross Travel 177mm (limited to 110mm due to bits in the way)
• Tee Slots 2 x 1/2"
• Height 130mm (travel from set position 46mm)
• Hand Wheel Graduation 0.001" (= 0.0254mm x 100 per revolution = 2.54mm per revolution)
• Weight (nett) 28kg

Timing Pulley config

• X = x10 (Stepper) connected to x20 (hand wheel): 1 revolution = 2.54mm/2 = 1.27mm
• Y = x10 (Stepper) connected to x20 (hand wheel): 1 revolution = 2.54mm/2 = 1.27mm
• Z = x10 (Stepper) connected to X30 (hand wheel): 1 revolution = 50mm/3 = 16.666667mm

Purchased

• T5 - 10 Tooth - 10mm Timing Belt Pulley x 4
• T5 - 20 Tooth - 10mm Timing Belt Pulley x 4
• T5 - 30 Tooth - 10mm Timing Belt Pulley x 1
• T5 - 50 Tooth - 10mm Timing Belt x 2
• T5 - 80 Tooth - 10mm Timing Belt x 2
• T5 - 60 Tooth - 10mm Timing Belt x 1

Resulting Axis Config

• X = 1.27mm(revolution) / 200(steps) = 0.00635 per step = 157.48 per mm
• Y = 1.27mm(revolution) / 200(steps) = 0.00635 per step = 157.48 per mm
• Z = 16.666667mm(revolution) / 200(steps) = 0.083333 per step = (12 per mm x16 microsteps) = 192.00 per mm