Oliver 2019, Руководство пользователя

Страница: 36 / 56

36 | Page Oliver Machinery 2019 Lathe
Tool Marks
Tool marks can be reduced with optimized lathe settings and better cutting techniques:
Problem Solution
Making cuts too aggressively
for the lathe speed.
•
Do not force a cut. Take the time and let the cutting tool shave off
the wood itself.
•
Increase lathe speed if it’s too slow for a workpiece.
Pushing the tool into the wood
and flexing it. •
Use sharp tools and resharpen tools often.
•
Apply force to hold the tool on the tool rest instead of pushing
the tool into the wood. Take the time and let the cutting tool
shave off the wood itself.
•
The structure of the workpiece is not strong enough to withstand
the force of cutting. Support the workpiece with a steady rest if
possible. Suppose a workpiece is to be turned very thin, take a
multi-phase approach so the section farthest from the
faceplate/centers/chuck is completed first, and then work
towards the mounting point.
Not riding/floating the bevel
when performing a cut. •
Support the cutting edge with the bevel.
The heel of the bevel is
burnishing the wood surface. •
Make sure the tool’s bevel is in parallel with the turning surface.
•
Remove/smooth the heel of the bevel.
•
Use a bigger grinding wheel to resharpen tools to reduce the
curvature of the bevel.
Kent Weakley has good tips on reducing tool marks:
https://turnawoodbowl.com/10-tool-marks-tricks-wood-bowl-understand-fix-remove/
Catch
A catch happens when the operator presents the tool to the wood in a way that causes the tool to dig into
the wood uncontrollably. A small catch can gouge the workpiece, and a big catch can cause the workpiece
to disintegrate or pull the tool away from the operator’s hand. It is important to use the right tool for
different types of turning and present the tools the way the manufacturer recommends.
The article “Five Ways to Avoid a Catch” by Lyle Jamieson has good illustration s of how a catch happens
and how to avoid it.
https://lylejamieson.com/wp-content/uploads/press-5-ways-to-avoid-a-catch-march1996.pdf
Using Wrong Cutting Tools
Beware that spindle gouge, spindle roughing gouge, and skews are unsuitable for bowl turning. Tools for
spindle work typically have a thin tang, which is not designed to withstand the impact of bowl turning.
Likewise, do not use tiny tools for roughing big blanks. Failure to do so can result in severe catches or loss
of control of the tools, which can cause severe injuries or death.