Using two Ogura clutches to achieve a two speed operation on an N/C Lathe.
Ogura multiple disk electro-magnetic clutches.
Ogura MDC or MWC (for wet applications) exact size will depend upon torque requirements.
Description of Operation
The motor runs at a constant RPM. When low speed is required, clutch #1 is engaged, when higher speed is required clutch #1 is disengaged and clutch #2 is engaged bringing the chuck up to its maximum speed. Because of the inertia involved in this system if an emergency stop is required power is cut to the motor by use of an emergency stop button and the spring applied brake brings the entire system to a stop.
Reason for Selection of the Electromagnetic Multiple Disk Clutch
Because of the ability to transmit high torque in a relatively small space the Ogura MDC clutches are ideal. Since the amount of total cycles is relatively small along with the amount of total slip time it is not necessary to go to a single face friction. Most applications are dry, and therefore, would use the MDC clutch ; however, there are some applications that are run inside a gear box housing that would require an MWC (wet type) clutch. serious injury.
Besides two speed lathe applications there are a number of 2, 3, and 4 speed types of applications on the market. Besides machine tool manufacturers other good prospects for MDC and MWC clutches are gear box manufacturers or companies that manufacture multiple speed and variable speed industrial transmissions.