Engineering Calculator · Hydraulic Chucks and Rotary Cylinders
Hydraulic Chuck Clamping Force & Cylinder Pull Force Calculator
Estimate theoretical hydraulic cylinder pull force, effective drawbar force and approximate hydraulic chuck clamping force from chuck size, rotary hydraulic cylinder piston area and input hydraulic pressure. The result is for preliminary selection and pressure reference, not an absolute on-machine clamping force value.
Technical Reference and Product Data
This calculator estimates the theoretical hydraulic cylinder pull force and the approximate chuck clamping force based on chuck size, cylinder piston area and input hydraulic pressure. The calculation logic follows KORRETTO hydraulic chuck and rotary cylinder technical data and is intended for preliminary selection, cylinder matching and pressure reference.
If you are not sure about the chuck model, allowable drawbar force, maximum clamping force or cylinder piston area, please refer to the hydraulic chuck series, 3-jaw hollow hydraulic chuck, 2-jaw hollow hydraulic chuck, 4-jaw hollow hydraulic chuck, 3-jaw solid hydraulic chuck and rotary hydraulic cylinder parameter pages.
Enter Chuck, Cylinder and Pressure Data
How is hydraulic chuck clamping force estimated?
| Item | Formula / check | Meaning |
|---|---|---|
| Hydraulic cylinder pull force | Pressure MPa × piston area cm² × 0.1 | 1 MPa acting on 1 cm² is about 0.1 kN. |
| Effective drawbar force | min(theoretical cylinder force, chuck allowable drawbar force) | The chuck allowable limit caps the result. |
| Estimated total clamping force | The estimated clamping force is converted according to the technical relationship between allowable drawbar force and maximum clamping force, and capped by the chuck allowable drawbar force. | For preliminary comparison only. |
| Average clamping force per jaw | Estimated total clamping force ÷ jaw count | An average reference, not a real contact-point force. |
Actual clamping force is affected by speed, soft jaw mass, clamping diameter, jaw height, lubrication, wear and drawbar assembly. High-speed turning, thin-wall parts, heavy cutting and non-standard chuck systems require engineering review.
Typical uses for this calculator
Preliminary hydraulic chuck selection
Compare chuck size, allowable drawbar force and maximum clamping force before final selection.
Rotary hydraulic cylinder matching
Estimate theoretical hydraulic cylinder pull force from recommended cylinder data or custom piston area.
Hydraulic pressure reference
Check whether a pressure setting approaches the chuck allowable drawbar force.
Replacement review
Compare an existing chuck or cylinder with a new model before detailed engineering review.
Custom cylinder combinations
Estimate whether a non-recommended cylinder may exceed the chuck-side allowable force.
Do not use the estimate as the final judgment for
- Dynamic clamping force at high spindle speed.
- Safety judgment for heavy cutting.
- Thin-wall part deformation.
- Non-standard chucks outside allowable limits.
- Cases where jaw mass, clamping radius or workpiece friction is unknown.
Parameter explanation
| Parameter | Engineering meaning |
|---|---|
| Hydraulic pressure MPa | Input pressure from the hydraulic unit. |
| Piston area cm² | Effective area acted on by hydraulic pressure; pull side usually subtracts rod area. |
| Allowable drawbar force | Allowable axial force limit for the chuck model. |
| Maximum clamping force | Maximum total clamping force under stated conditions. |
| Average clamping force per jaw | Total estimated clamping force divided by jaw count. |
| Maximum operating pressure | Recorded pressure limit for the chuck or rotary cylinder. |
FAQ
How is hydraulic chuck clamping force calculated?
This calculator first estimates hydraulic cylinder pull force as pressure in MPa multiplied by piston area in cm² multiplied by 0.1. It then applies the technical relationship between maximum clamping force and allowable drawbar force, with the result capped by the chuck allowable drawbar force.
Why do different cylinders produce different force at the same pressure?
At the same hydraulic pressure, cylinder output force depends mainly on effective piston area. A larger area produces higher theoretical force. On the pull side, the rod area usually reduces the effective area.
Can I calculate with a non-recommended rotary hydraulic cylinder?
Yes. Switch to custom piston area or custom piston diameter mode and enter the actual cylinder data. The result still needs to be checked against chuck allowable drawbar force, stroke, mounting interface and real clamping conditions.
Can the estimated clamping force be used as the final safety value?
No. The estimate is for preliminary selection only. Real clamping force is affected by speed, soft jaw mass, clamping diameter, jaw height, lubrication, wear, drawbar assembly and workpiece friction.
Why is the result capped by allowable drawbar force?
The allowable drawbar force is the allowable limit for the axial force that the chuck can accept. Even if the cylinder can generate more force, the chuck-side estimate should be capped and the allowable limit should not be exceeded.
Is the calculation different for hollow and solid hydraulic chucks?
The formula is the same, but the chuck construction, recommended cylinder, piston area, allowable drawbar force and maximum clamping force are different. Hollow hydraulic chucks normally use hollow rotary cylinders; solid chucks normally use solid rotary cylinders.
Is piston area or piston diameter more accurate?
If the parameter table gives pull-side and push-side piston areas, use the area values directly. Diameter mode is useful when the area is not listed but piston diameter and rod diameter are known.
When should I send drawings for engineering review?
Send drawings when the part is thin-wall, eccentric, heavy-cut, high-speed, uses heavy jaws, has a large clamping radius, or when the chuck and cylinder are not a recommended pair.