PRECIS ION GEAR BOX FOR THREADING The Hardinge HL V-H lathe has a precision quick change gear box designed and built for threading - there has been no compromise as with most lathe gear box designs where the gear box is run constantly and used for both power feed of the carriage and threading operations. The gear box is instantly engaged or disengaged and o perat es only when t h re ad c uttin g. The result is obvious; the original accuracy is sustained for threading operations. Here again, this lathe is deSigned to speed production by making everything simple for the operator. look at the clear, easy, direct reading gear box thread chart.
It is not confusing with a mixed dual purpose as are the plates on other lathes which give both threads and feeds - compare with lathes in your shop. Standard threads. including pipe threads, are im - mediately available through the gear box - refer to speci- fication section Page I S. By the use of outside change gears pitches to 250 threads per inch can be cut. PRECISION LEAD S CREW FOR THREADING wi th Automatic Thread Le ngth Control for Car ri age Users confirm that the Hardinge HLY-H lathe Is the fastest threading standard lathe available.
The automatic thread length control makes threading easy at turning speeds-even when threading to a shoulder or into a blind hole without a threading relief. With this control we have eliminated the slow troublesome threading dial. The lead screw nut is engaged at the start of the thread and re- mains engaged until the thread is completed. These positive stops accurately control the automatic stopping of the carriage for either left or right hand threads at the starting and finishing position. The lead screw is used for threading only - the result is obvious: the original accuracy is sustained for precision threading operation. 10