10
Setting Up the Machine
Initial Set up
Introduce the chisel into the adaptor collar, press the
auger up into the chuck, tighten the chuck and withdraw
the chuck key. Gently pinch the chisel in place by finger
tightening the clamping bolt. (See figs A,B)
Setting the Chisel Auger Clearance
The old rule of thumb for chisel auger clearance was
known as “the one penny width”. This was achieved by
introducing a penny between the locating shoulder of the
chisel and the adaptor face, with the auger locked in place
and with the chisel pulled hard down on the auger. The
penny was then removed and the chisel pushed up to the
adaptor face and locked in place, this established the “one
penny width” between the chisel and the auger, which for
general timbers and mortice sizes is quite adequate.
Traditional morticers normally had a cross pin in the auger
mounting mandrel, to prevent the auger being pushed
back up into the chisel. The mounting method on the
newer morticers is a chuck. It is well worth taking the extra
time and care to prepare your augers to give the correct
‘reach’ when ‘bottomed’ out in the chuck. This will prevent
the auger being pushed back towards the chisel and
altering the clearance setting. (See fig C)
Fig A.
Fig B.
Clamping bolt
Chuck key
Hollow Chisel
