Raw Material / Billet Sizer

Calculate the exact raw material dimensions required by adding machining allowances and workholding grip to your finished part size.

Finished Part Dimensions
Machining Allowances
Removes mill scale and guarantees clean outside dimensions.
Material removed from the top surface.
Material held in the jaws (will be faced off in Op 2).
Required Raw Stock Dimensions
Standard Stock to Order:

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Rounded up to nearest standard material sizes.
Absolute Minimum Billet
Length
0.000
Width
0.000
Total Z / Height
0.000
Stock Preparation Guide
VISE JAWS PART Face Grip X/Y
Why add allowances?
  • Peripheral Cleanup: Extruded bar stock is rarely perfectly straight or dimensionally accurate. Adding 0.100" (2.5mm) gives you 0.050" on each side to machine away the rough outer skin.
  • Facing: Gives you material to establish a perfectly flat, clean Z-Zero datum.
  • Vise Grip: You need enough material for the vise jaws (or dovetail fixture) to grab securely without the cutter hitting the hard steel jaws during Op 1.
Purchasing Tip: Raw stock is sold in standard fractional or metric sizes. Buying exactly the minimum size is impossible. The calculator automatically rounds up to the next standard extrusion size (e.g., 1/8" increments for Imperial) to reflect reality.