Download The recycling, use, and repair of tools by Alexander Weygers PDF

Show description

I find myself using this type of center more than any other. Another design has a socket with a locking screw, as illustrated. It can take a small solid cone insert or a little crater center or a small wide cup center ‘with 2 leading pin. If the pin is left cut entirely the wide cup can take many irregular workpieces in a self-centering action. Other types of center arrangements are shown also; they are all variations of the same principle and serve to hold the workpiece in alignment with the headstock drive during the cutting action.

One type is the open cup cwuer. It will hold a piece of wood that may not be entirely round. The workpiece will seekits own center and form its own seating in such a cup. Under friction an uneven wood ending would wear somewhat under compression into an even fit. After a little lubrication, cutting can start right away. This system bypasses the need for an exact centering of the wo:kpiece with a predrilled hole. When you usea deep cup center, the workpiece cannot be pushed out of its seating during the full run of the turning operation.

SOLDERING METALS TOGETHER Soldering metals resembles somewhat the technique of welding. In both instances it is important that the oxygen in the air not reach the melt. This can be accomplished by surrounding the melting area with a substance that keeps the oxygen out but at the same timedoes not interfere with the fusing of the solder on the surfaces to be bonded together. ncxh In silver soldering a borax flux keeps the oxygen away from the metals. Zinc-saturated muriatic acid applied to the metal surfaces degreases all the pores, which will then, as a rule, accept the bonding metal at the point of its melt; the zinc element acts as a catalyst.