PRECISION TOOL & DIE / SINKER EDM
Die Sinking EDM 3D Electrode Orbit & Spark Gap Calculator
Compute sinker EDM front/side spark gaps, 3D planetary orbiting radius ($R_{\text{orbit}}$), total per-side electrode undersize compensation ($\Delta = \text{Gap} + R_{\text{orbit}}$), and surface roughness VDI ratings.
1. Discharge Regime & Surface Finish
2. Orbiting Mode & Clearance
Electrode Undersize & CAM Offsets
Side Spark Gap
0.060 mm
Electrical discharge gap
Planetary Orbit Radius
0.120 mm
CNC machine orbital path
Total Undersize (Per Side)
-0.180 mm
CAD/CAM 3D model shrink
Surface Finish
VDI 24
Ra 1.6 µm / CLA 63
✓ Electrode profile must be milled undersized by exactly 0.180mm per side in CAM.