The following is a basic installation procedure using a standard Bedford pneumatic chuck as an example:
1. Install the connecting sleeve and tighten the screws. Connect it to the rear of the machine tool spindle. Use a dial indicator to adjust the radial and axial runout to within 0.05 mm.
2. Clean the chuck and flange. Use a caliper to confirm that the flange dimensions match the chuck mounting dimensions.
3. Install the spiral air hose and connect it to the chuck's air inlet. Secure the air hose carefully to prevent damage.
4. Route the air hose through the spindle. Use a thin steel wire to pull the hose through the spindle from the rear, ensuring that the air passage is unobstructed.
5. Position the chuck and gently seat it onto the flange, then secure it with screws.
6. Accuracy inspection: Measure the cylindrical runout. A runout of ≤0.05 mm indicates that the chuck has been installed correctly.

Taking the Bedford KQ Series solid-body pneumatic chucks as an example:

For ultra-small workpieces with a diameter of less than 10 mm, collets or customized fixtures can be used to achieve secure and accurate clamping.

Hard Jaws:
Hard jaws are heat-treated for high wear resistance. They are suitable for clamping rough-machined workpieces, castings, forgings, and other workpieces with relatively rough surfaces.

Soft Jaws:
Soft jaws are not hardened and can be machined according to the shape and diameter of the workpiece. They provide higher clamping accuracy and are particularly suitable for precision machining.

Recommendation:
It is recommended to keep both types available: use hard jaws for rough machining and switch to soft jaws for precision machining.

Chuck sizes are commonly specified in inches. The following table shows the approximate metric equivalents and typical workpiece diameter ranges:

Note: The diameter indicated for a chuck generally refers to its maximum external clamping diameter. The actual effective clamping range is approximately 60–80% of the nominal chuck diameter, depending on the chuck design and application.

When selecting a chuck for an automated production line, the following factors should be considered:
1. Clamping and changeover speed: Pneumatic chucks are preferred for applications requiring fast workpiece changeover, with switching times of approximately 0.5 seconds.
2. Large through-hole: A large through-hole facilitates automatic bar feeding and improves production efficiency.
3. Position detection: Select a chuck equipped with a workpiece-in-position sensor or signal feedback interface.
4. Robot compatibility: Make sure the chuck opening and closing cycle matches the operating cycle of the robot or automation system.
5. Service life: For continuous automated production, the chuck should ideally have a service life of more than 1 million cycles.
 

Bedford has developed the KQ-A Series dedicated pneumatic chucks for automated production lines. These chucks feature workpiece-position detection interfaces and can be integrated with mainstream industrial robot systems.

Under normal operating conditions, the seals of a hydraulic chuck are recommended to be replaced every 6–12 months.

If the chuck operates at a high frequency or in harsh machining environments, such as environments with heavy dust or frequent exposure to cutting fluid, the replacement interval should be shortened to approximately 3–6 months.

All Bedford hydraulic chucks are equipped with high-quality seals as standard. Replacement seal kits are also available, allowing customers to perform routine seal replacement themselves.

Common causes of excessive concentricity runout and the corresponding solutions include:

Cause 1: Chips or contamination on the spindle face
→ Clean the spindle face thoroughly using compressed air or a clean cloth.

Cause 2: Wear on the chuck-to-flange mounting surface
→ Regrind the mating surface or replace the flange if necessary.

Cause 3: Internal chuck bearing wear
→ Return the chuck to the manufacturer for inspection and repair, or replace the chuck if necessary.

Cause 4: Incorrect installation or insufficient alignment
→ Reinstall the chuck and use a dial indicator to accurately align and correct the installation.

Daily Maintenance:

• Before starting the machine, use compressed air to remove chips and debris from the chuck surface and jaw grooves.
• Check whether the air pressure or hydraulic pressure reading is within the normal range.

Weekly Maintenance:

• Check whether the chuck locking screws are loose.
• Inspect the air and hydraulic lines for wear or leakage.
• Apply grease to the sliding and moving components of the chuck.

Monthly Maintenance:

• Disassemble and clean the jaws and check for wear.
• Inspect the seals for signs of leakage or damage.

Regular maintenance helps maintain clamping accuracy, extend chuck service life, and reduce unexpected downtime.