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Tony Manella discusses the hollow form.
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Tony holds the Stewardt tool system.
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TONY MANELLA & DINYAR CHAVDA HOLLOWING TOOL DEMONSTRATION
AUGUST 8, 2002
Tony and
Dinyar presented a survey of tools used to hollow the inside of closed forms. After the outside of a
form has been shaped, whether a closed form or an open bowl with a rim that turns inward, the wood must
be removed from the inside of the form to the wall thickness desired. Sometimes the wood must be removed
through a small hole.
Dinyar and Tony displayed a variety of scraping tools used to accomplish
hollowing. These included straight tools and bent tip tools designed by David Ellsworth and Chris Stott.
The Ellsworth tools are made of large drill rod secured in a long handle and tipped with machine tool
bits at different angles for different parts of the interior. Chris Stott tools are formed from bar
stock and bent at various angles and are made for small work. Tony and Dinyar displayed homemade versions
of these tools in a variety of sizes and angles. Tools are made from drill rod and tool bits or from
screw drivers or allen wrenches. Tool bits are secured with set screws or ca glue. Solid bar can be
heated and bent. Tempering and annealing are not usually necessary.
The Stewart tool is also
a scraping tool. It is made up of a heavy shaft, bent or straight, held in an armbrace, tipped by a
straight tool bit or a teardrop shaped bit. The angle of the bit is adjustable through a wide range
of angles and projections. Jim Neff demonstrated the use and sharpening of the Stewart tool.
Dinyar
and Tony then explained the use of the hollowing tool they now prefer. The Proforme hollower is a shaft,
bent or straight, available in several lengths, which fits into a heavy handle and holds a bladed cutting
tool with a hooded shield to limit the depth of cut. The hood can be adjusted to allow a more or less
aggressive cut. The Exocet is a similar tool made by a different manufacturer. The advantage of a bladed
cutting tool as opposed to a scraper is that wood can be removed more quickly and a smoother surface
can be obtained. Tony and Dinyar demonstrated the use of the tool and offered the opportunity for others
to try it. The cutting tool can be used at a lower rpm than the scraping tools.
Dinyar demonstrated
the Irons toolgate toolrest he uses. It is basically a flat rest with pins or a u shaped saddle to restrain
the sideways movement of the tool.
The Proforme hollower can be sharpened with a diamond hone
and should not need to be reground. The scraping cutters can also be sharpened with a diamond hone.
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