FABtotum Personal Fabricator, Руководство пользователя

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FABtotum Complete Manual
www.fabtotum.com
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INTRODUCTION TO MILLING BITS
The FABtotum Milling Head V2 and Hybrid Head both natively support milling bits with a shank diameter in the range of
3.0 to 3.5mm (0.12 inches or 1/8“)
The above ER8 Collet can be swapped with another compatible one in the ER8 family.
Additional ER8 Collets allow to mount endbits with shank diameter from 1 to 5mm.
Endbits (or Milling cutters) comes in different shapes and sizes, each one for a specific purpose.
Engraving is usually done with fine, point-shaped endbits at higher speeds. Cutting and Roughing of the stock piece
are usually done with flat roughing end mills while finishing in 3D milling is done with fine ball nose cutters.
Endbits remove the material by “biting” it away with their flutes while spinning. Each endbit can have a different amount
of cutting flutes depending on the diameter and the purpose. The Number of flutes refers to the number of cutting edges
that are cut into the body of the tool. More flutes increases the strength of the tool, but reduces space for chip flow. You
can cut fast with a single flute tool, but the finish of a three or four flute cutter will be smoother.
Since the number of flutes increases the friction on the tool, which causes the tool to heat up. Some materials, like acrylic
or PMMA, require the use of tools with fewer flutes in order to reduce the heat and avoid melting the material. Ideally the
tool should never create waste material (chips) that are hotter than room temperature, but that can change very
dramatically from material to material.
The speed at which a bit is spun is described in RPM (revolutions per minute).
Every bit has an ideal range of speed or RPMs it needs to operate within.