whee fF 8% Wess SS sad asl

[ehhh aa

The kin buiding course af ECIAD Aas|na permanent (ie. welding} fastening was | equalled the radius of the circle.

emphasized simipia metheds of waing hare
made tools, The next few issues of the

needed

Two washers were placed between the angle

newsletter wil report an the duiding of twa) The first step in creating tha round metal jiron and the steel at the pivet point to
AfcLennan styla circular fopdeading alectnc /bases was to make a round template out of eliminate tension on the cobalt bit as it cut.

ins walt 26 insulating franacks and high
fasg Kanthal A-T elements. The larger Avn

has an infenor foading space of
approximately 6 cu, §. and emailer kin about
Zou. Tam Irving

{Tam [3 using professorial privilages and
has dalegated the writing and illustrating
duties to Matthew Church, a student in the
kiln building course) ad.

Bases for Klins

Our first stap in tha making of the 6 cubic
foot kiln was to Suild the kilns base, The
basa is made of 1/8" plate steel and has a
diameter 1" greater than the circumference
of the kiln, The base is round and supported |
on four legs that ara made from 7 1/2" angle

Iran that lift the kiln 4° off the ground, The
legs are fastened to the base by belting them
to a square frame made farm 1 1/2" tubing
which was in turn belted to the base so that

cardboard, This allowed us te lay out the
circles an the metal and minimize wastage.
We then traced the circles an to the steel
plate. upon which we located the center and
there dolled a 1/4" pivot hole and then a 3/8"
hele for a lag bolt The lag bolt was the
central pivot point for the angle iran arm
where the cutting tool was fastened,

The Cutting Tasl

The cutting tool was made from a piece of
eobalt steel and ground to a sharp point
tapering to create a deeper cut to one side
(see diagram on trepanning). The tip was |

angle-iran and bolted for additional stability.
After the cutting tool was fastened to tha
angle-iron, the arm was then bolted through
the hole drilled in the centre of our drawn
circlas, so that the distance from the central
pivot point to the tip of the cutting tool

Camman sense must ba relied upan fo
dacide how much dowfward pressure to
apply to the bit when rotating it. Too much
and the bit will snap, not encugh and you will
barely score the 1/8" plate steal, A good,
deep cut makes it easiar to flex af the excess
matal. The groove should be kept oiled
during cutting te protect the bit and make
cutting easier. The plate metal is Ripped and
the process is repeated on the other side,
making sute that the new groove is aligned
wiih the first ane. After cuts ara mada to
both sides it is time to flex off the excess
metal, it is helpful to have tow ar three

‘than welded to a clamp that fitted over the | pacple rocking in unison ta weaken the matal

at the cut, The legs are attached as
previewsly deseribed and the entire base is
then painted with a rust proof enamal for
protaction.

Matthew Church

OFF ‘WITH

= VISE-

APPLIED
PRESSURE

GRIPS

P — CIRCULAR
ROTATION

ay
fay
ee i).

= [SUPPORTS JO) x

CENTER

TO ONE SIDE

CROSS SECTION OF CUTTING TOOL

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