Balancing Machine for Crankshafts
320 SBRK | 520 SBRK

Range of application
Measurement and correction of un-balance of machined passenger-vehicle and commercial-vehicle crankshafts. Use of the machine in mid-volume production. Unbalance correction by drilling into the counterweights in one or more correction steps.

Design
Single-station machine with stable balancing frame and hydro-dynamic support pedestals. Hook-drive for driving the crankshaft at the crank-pin. Rear-inclined drill gantry with NC-controlled carriage-drill unit.
Indexing the crankshaft, displacement of the drill unit and control of drilling depth by the microprocessor-controlled measuring unit.

Sequence of operations

• Manually or automatically load the crankshaft
• Close the protective door and start the automatic measuring run:
• Lower the crank into sleeve shells, close the counter bearing, measuring run, drill the correction holes, check run, open the counter bearing, index to the home posi- tion, lift
• Open the protective door and unload

Special features
Measurement and correction of unbalance in the same station; hence less rotor handling.

The vibrating frame with multiple journal bearings provides measurement under conditions similar to operating conditions, less surface loading when drilling and is gentle on main crank journals.

Drilling with coolant shortens drilling time and improves tool life.

Version with minimum quantity lubrication now available!

• No coolant cost
• More accurate measurement
• Easier chip removal
• Lower space requirement

Microprocessor-controlled measuring unit with monitor for optimum correction calculation. Software packages available for component or optimized correction. Further features: Operator prompting, diagnostic program, fault display, statistics program and printer interface. Display in German or English is standard; other languages on request.

Drive by precision spindle and hook at one crank pin means easy loading of the machine and positive connection between crankshaft and drive. When balancing asymmetric shafts free moments are compensated for at the drive shaft. Counter holder prevents lifting of the shaft during rotation. A 2-spindle drilling unit enables permits different drill diameters without tool change.