Results
Results
Results
Suggested surface speeds (SFM) by material and tool. Use the lower end of the range for tougher cuts (deeper DOC, harder grade, less rigid setup). Use chip-load suggestions from tool maker — these are speeds only.
Spindle/drive efficiency factor (0.80 typical)
Results
75% is the standard machine-tap target; 60% for hand tapping in tough metals
Results
Xi = Cx + R·cos(θ₀ + i·360°/N)
Yi = Cy + R·sin(θ₀ + i·360°/N)
Yi = Cy + R·sin(θ₀ + i·360°/N)
Coordinates
Right triangle. a = side opposite angle A, b = side adjacent to A, c = hypotenuse. Angle B = 90° − A.
Results
Stack Height = Bar Length × sin(Angle)
Stack gage blocks at one end of the sine bar/plate to tip the work to the desired angle.
Stack gage blocks at one end of the sine bar/plate to tip the work to the desired angle.
Common bars: 5″, 10″ / 100, 125, 250 mm
Results
Theoretical Ra ≈ Feed² / (32 × Nose Radius)
Actual finish typically 1.5–2× theoretical. For finer Ra: increase nose radius, decrease feed, increase rigidity.
Actual finish typically 1.5–2× theoretical. For finer Ra: increase nose radius, decrease feed, increase rigidity.
Results
Point Depth = (D/2) / tan(Angle/2)
Total Z-clear depth = target hole depth + point depth (so the full diameter clears).
Total Z-clear depth = target hole depth + point depth (so the full diameter clears).
118° standard HSS · 135° split-point / cobalt · 140° hard materials · 90° center-drill
Results
Std (pt/hr) = (60 / Cycle Time) × Efficiency
Hrs Earned = Parts Run / Std
% Std = Hrs Earned / Hrs Run
Hrs Earned = Parts Run / Std
% Std = Hrs Earned / Hrs Run
:
Minutes : Seconds
Allowance for setup, tool changes, breaks (0.80 = 80%)
:
Results
Results