I am now converting a mill head (taken from my
lathe

Updated photo - had to build a new case and earthing to stop noise mucking up axis positions.
Notes on building a CNC machine
Mill Head
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Drilling Capacity = 13mm
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End Mill Capacity = 13mm
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Face Mill Capacity = 50mm
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Spindle Taper = MT2
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Spindle Stroke = 50mm
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Head Tilt = +/- 90 degrees
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Number of Spindle Speeds = variable
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Range of Spendle Speeds = 50~2250RPM
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T-Slot Size = 8mm
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Motor = 500W, 1Ph, 230V
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Hand Wheel Graduation 1mm (= 1mm x 50 per revolution = 50mm per revolution)
Stepper motors
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1.8 deg. (200 steps per revolution)
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bipolar
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4 wires
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3 Amp / Phase
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1.8 Nm
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Nema 23
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shaft 6.2mm d
Compound Table
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Table Size 155 x 470mm
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Longitudinal Travel 290mm (limited to 240mm due to bits in the way)
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Cross Travel 177mm (limited to 110mm due to bits in the way)
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Tee Slots 2 x 1/2"
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Height 130mm (travel from set position 46mm)
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Hand Wheel Graduation 0.001" (= 0.0254mm x 100 per revolution = 2.54mm per revolution)
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Weight (nett) 28kg
Timing Pulley config
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X = x10 (Stepper) connected to x20 (hand wheel): 1 revolution = 2.54mm/2 = 1.27mm
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Y = x10 (Stepper) connected to x20 (hand wheel): 1 revolution = 2.54mm/2 = 1.27mm
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Z = x10 (Stepper) connected to X30 (hand wheel): 1 revolution = 50mm/3 = 16.666667mm
Purchased
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T5 - 10 Tooth - 10mm Timing Belt Pulley x 4
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T5 - 20 Tooth - 10mm Timing Belt Pulley x 4
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T5 - 30 Tooth - 10mm Timing Belt Pulley x 1
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T5 - 50 Tooth - 10mm Timing Belt x 2
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T5 - 80 Tooth - 10mm Timing Belt x 2
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T5 - 60 Tooth - 10mm Timing Belt x 1
Resulting Axis Config
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X = 1.27mm(revolution) / 200(steps) = 0.00635 per step = 157.48 per mm
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Y = 1.27mm(revolution) / 200(steps) = 0.00635 per step = 157.48 per mm
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Z = 16.666667mm(revolution) / 200(steps) = 0.083333 per step = (12 per mm x16 microsteps) = 192.00 per mm
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