Chuck Jaw Selection Calculator

Jaw type and expansion range from workpiece diameter.

Workpiece diameter (in)

Grip mode (0=compress, 1=expand)

Tenon/recess diameter (in)

Tenon depth (in)

Tab to move between fields

Recommended tenon dia (in)

2.67

Best jaw size (in)

2.5

Jaw min grip (in)2

Jaw max grip (in)3

Dovetail angle (deg)10

Tenon depth OK? (1=yes)1

Max safe RPM750

How to Use This Calculator

Enter Workpiece diameter (in), Grip mode (0=compress, 1=expand), and Tenon/recess diameter (in).
Set Tenon depth (in).
Review Recommended tenon dia (in) and Best jaw size (in).
Use Jaw min grip (in) and Jaw max grip (in) to inform your decision.

How the result changes with Workpiece diameter (in)

Workpiece diameter (in): Outer diameter of the blank being mounted.
Grip mode (0=compress, 1=expand): 0 for compression/external grip on a tenon; 1 for expansion/internal grip in a recess.
Tenon/recess diameter (in): Diameter of your tenon or recess. Leave at 0 for a recommendation based on blank size.
Tenon depth (in): Depth/height of the tenon or recess.

Recommended tenon dia (in): Suggested tenon diameter (~1/3 of blank diameter).
Best jaw size (in): Closest standard jaw size for your tenon/recess.
Jaw min grip (in): Minimum diameter this jaw set can grip.
Jaw max grip (in): Maximum diameter this jaw set can grip.
Dovetail angle (deg): Recommended dovetail angle for tenon profile (0 for expansion mode).
Tenon depth OK? (1=yes): Whether the tenon depth is within the safe range (3/8" to 3/4").
Max safe RPM: Conservative maximum RPM for this workpiece diameter on a scroll chuck.

Identify Input Parameters
4 parameters
Workpiece diameter (in) = 8, Grip mode (0=compress, 1=expand) = 0, Tenon/recess diameter (in) = 0, Tenon depth (in) = 0.375 = 4 input(s) provided
Calculate Recommended tenon dia
Recommended tenon dia = workpieceDiameter / 3
2.67 = 2.67
Calculate Best jaw size
2.5 = 2.5
Calculate Jaw min grip
Jaw min grip = Math
2 = 2
Calculate Jaw max grip
Jaw max grip = bestJaw + tolerance
3 = 3