Your Location: Home > Products > Tap Holders > Type SWITCH-MASTER

Tap Holder Type SWITCH-MASTER

Application Range and Characteristics

The SWITCH-MASTER tapping attachment has been designed for use on CNC-controlled machines. Owing to the integrated reverse gear mechanism, the change of rotation of the machine spindle is no longer needed.

Normally the tapping attachments type SWITCH-MASTER are made for cutting right-hand threads. However, on request the attachment can be produced also for left-hand threads. The turning direction of the machine spindle remains right-turning in both cases.

For use of the tapping attachment you will need a stop block taking over the following jobs:

• Support of the torques arising during the machining process.
• Correct definition of the position between machine spindle and stop block when using automatic tool changers.
• Supply with energy = compressed air (85 psi) needed for change of rotation.

The stop block is normally fitted to the machine before being delivered.

Interface to the machine spindle is a cylinder shank Ø 25 acc. to DIN 1835 B+E. Using adaptation shanks the use on all known spindle adaptations is quicker and cheaper.

Cutting range is M4 - M12.

Maximum permissible speed: 3000 rpm

A supply of compressed air (85 psi) is required for the change of direction of rotation. Tool locking is executed via collets acc. to DIN6499 of size ER 16. Owing to the better torque transmission, we recommend the use of collets with integrated square (type ER16-GB).

The attachments are designed for the use with internal coolant supply (IKZ) up to 700 psi coolant pressure.

Features and Advantages

• Quiet, smooth, low-wear running due to oil bath lubrication (SAE 75 W-90, 20 ccm).
• Safe sealing against cooling penetration leakage into the attachment due to separation of axial and radial movement of the clamping head.
• Reduced wear on the gear change elements thanks to extremely quick changes of the direction of rotation (35 msec).
• No axial jolts on the tap during gear changes.
• Minimized axial forces exerted on the thread flanks of the tap.
• Obtaining constant thread depths by exactly defined switching point.
• Reduced safety distance to 0.1969 inch between workpiece and tap due to short gear change path = reduction of cycle times.
• Constant cutting speed - Increased tool life.
• Protection of the machine spindle by constant right-hand running.
• As the tool spindle is not permanently accelerated or braked and the turning direction not changed, energy is saved due to almost constant power consumption.

The Function of SWITCH-MASTER

During the complete thread cutting cycle the machine spindle rotates right-hand. After reaching the programmed feed depth the Z-axis switches to reverse without dwell time.With the interaction between feed reverse of the Z-axis and the positive feed caused by the pitch of the rotating tool, the tool adaptation clamping head is axially pulled out of the tapping attachment.

This pulling out brings about the reversing of the rotating direction (reverse). After the tool leaves the produced thread, the spring-loaded tool adaptation clamping head is pulled back into its initial position and the tool again changes the rotating direction. The auxiliary energy - "compressed air" - required for the switching procedure must be available permanently with 85 psi at the tapping attachment during the whole machining process.

Maintenance Schedule

The maintenance of the tapping attachment may only be carried out at EMUGE and should be executed after 250.000 machined threads! Following maintenance intervals are defined acc. to the result of the first maintenance.

Calculation of Economy

Machining Conditions

Machining time and costs per component for 40 thread bores

Calculating the "break even point"

Developed & Hosted by 3000K