Clarke CBM 2B Istruzioni per il funzionamento e la manutenzione - Pagina 16
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SHARPENING THE DRILL BIT & CHISEL
For best performance the chisel and bit need to be kept sharp. Blunt cutting
edges will give untidy and inaccurate mortises, and can cause overheating
and breaking of the chisel and bit.
Sharpen the bit by using a small smooth
file, following the original shape of the
bit. File the inside edge of the spur, the
sides of the brad point, and the cutting
edge inwards towards the flutes of the
bit to restore sharpness. Do not file the
outside edge of the spur as this will
affect the diameter of the bit.
Use a mortice chisel cutter with the correct size
pilot to sharpen the chisel. Two or three turns of
the cutter in a carpenters hand brace should be
enough to sharpen the chisel. Remove any burrs
from the outside of the chisel with a fine oilstone.
Chisels and bits will need replacing when they
become badly worn and difficult to sharpen.
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