Model Engineers’ Workshop – August 2019

August 2019 23

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Cutter Grinder

Start

Run

Z1

Z2

U1

U2

240V

L

N

Start

Run

Z1

Z2

U1

U2

240V

L

N

10A switch

To reverse

switch U1 & U2

Connector block

Original Wiring

Revised Wiring

Wiring Diagrams

Link

indexing it round without any danger of
hitting the long edge. Repeat as oft en as
required to get a sharp tool. If the fi rst lip
needs more work all that has to be done
is set the penguin arm screw to zero and
proceed. I advise switching the grinder off
when doing any changes, not for safety,
but it is so easy to catch one of the lips
on the grinding wheel and give one a lot
more work to do again! Like the slitting
saw sharpening, it’s straightforward once
you have done one or two cutters. The
improvement of the cutter in action is

The 10 amp toggle switch with the spade
fi ttings

Set all angle scales on the machine to zero.
Aft er loosely setting the cutter in the collet,
the rest is put into position on the machine
to ensure it will not foul the grinding wheel
or wheel guard. Spiral the cutter forwards to
check all is ok and tighten the collet. Now set
the tool rest and fi ddle it into a clear position
just clear of the front of the cutter. There
should be minimal clearance between it and
the grinding wheel. Set the back stop on the
head spindle to limit the length of the cut.

Remove the head and loosen the T-nut fi xing

only, the one attaching the rest assembly to the

work head. The tool holder head is then put on

the jig. Swing the rest to one side to clear the

cutter above the setting block, slackens the end

screw holding the tool rest pin itself and lift it a

little. Do not let the fi nger mounting bar rotate,

keep this locked. Now use feeler gauges to set

the clearance angle by lift ing the loosened pin

and pressing it tight onto the block and locking

the fi nger pin in place.

Now swing the whole rest assembly into the

correct position and lock in place with the

T-nut fi xing

(^26) Fig.6
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