Embedded Files
Indexing spindle with additional disks
The spindle shown fitted with the one start worm, the five start below
Above: the dividing spindle was supplied as standard with a one start and a five start worm together with one division disk. The extra disks appear to be made of gunmetal.
The photo below shows the locking blade set in one of the notches. This has to be released each time it is moved to the next setting indicated by the adjustable spanning hands.
The number of divisions possible by the simple arrangement of gearing all of the change-wheels into two worms, and sub dividing this by 100 notches as per the division plate is enormous, an incredible 2 to 8,000 divisions.
Later versions of the Pittler lathe bearing the George Adams plate supplied disks with a number of holes instead of notches.
shown here are the adjustable spanning hands which are set to the division number required
A headstock dividing spindle was provided as standard with every lathe However B2 No 1253 also has tailstock dividing more often seen on the larger C3 lathe.
Driving the lathe from the tailstock is used for spiral cutting and certain other machining operations when powered by an overhead drive or for some operations by hand.
Below centre shows the special handle which replaces the standard one when using the lead-screw to drive the lathe from the tailstock, it has two teeth or lugs which locate on the end of the leads-crew and lock it together with the gear & worm wheel connected to the pulley shaft. The overhead drive then runs the mechanism to move the carriage extremely slowly for cutting spirals with a milling head held on the cross-slide. The headstock and it's chuck will turn slowly as well but speed will differ according to the wheel/worm set up on the mandrel and work held between centres can thus be cut with a spiral.
The standard handle mentioned above moves the saddle quickly along the bed as required.
Special handle for use when driving the leadscrew from the tailstock end
Standard and special handles
Tailstock gear shown during a dismantle
On the left shows the back of the tailstock indexing mechanism. I've yet to discover how this is supposed to disengage the drive from the overhead as it's completely different to that described in Pittlers catalogues and other references.
Google Sites
Report abuse