Centre Lathe Accessories - Catch plate and dog carrier

Centre Lathe Accessories - Catch plate and dog carriers

Catch plates are either screwed or bolted to the nose of the threaded, stock spindle. A projecting pin from the dog fits into the slot provided in catch plate. This imparts a positive drive between the lathe spindle and work piece.


Advantages turning between centres	Disadvantages turning between centres
Work can be removed for checking and re-set with no loss of centricity Work can be transferred among machines with no loss in centricity Can turn work around with no loss in centricity Long shafts can be machined, using the full length of the bed Easy to setup	Cutting speed effected id revolving centre is not used in tailstock Centre holes must be drilled before work can be set Boring, drilling, reaming processes can not be performed Vibration due to dog carrier Long shafts can bend without lathe steadies Only relative small cuts can be performed due to limited clamping power of the dog carrier Need considerable pressure to keep centres in position
https://www.youtube.com/watch?v=xEXXoT9asME
Steps to follow when turning between centres:

Drill each end of the shaft with centre holes Mount catch plate (driving plate) in headstock spindle Place soft dead centre in headstock spindle Place revolving centre in tailstock (can use dead centre but need to be lubricated regularly) Select correct size dog carrier and place on workpiece Use shim stock between dog carrier bolt and workpiece. This is not to damage work. Make sure the leg of dog carrier is making proper contact with catch plate Stet spindle speed correct Select correct feed for the operation

Note: This accessories are only used when machining between centres. Videos Additional website


Pin catch plate	Bend dog carrier	Slotted catch plate	Bend dog carrier

A three jaw chuck can also be used as a catch plate. Normally a dead centre will be turned in the three jaw chuck and a bend dog carrier will then be used.