Machinist

[Lawrence London <lfljvenaura@gmail.com>]

Flycutter geometry and tool path.

Hamish Haig If you consider the circle traced by the cutting tool as it swings around (Not the body of the flycutter). Velocity at a point on a circular path is always tangent. If the point of rotation is centred on the tool bit, the tangent is not square to the cutting edge as it is offset by half the tool thicknessManage

1

Like

· Reply · 2h

Hamish Haig The difference in angle between the tangent at the tip of the tool, and the desired tangent can be Approximated using the formula. This angle can be added to the rake angle ground into the tool to achieve the desired actual rake angle. the front relief angle can have this difference angle subtracted.Manage

Like

· Reply · 2h

Hamish Haig This adjustment cannot be made to carbide insert tooling so the angle must be removed to present the edge to the work at the correct angle. Note that this offset is parallel to the shank of a lathe tool yet may not be inline with one of its edges.Manage

Like

· Reply · 2h

Hamish Haig Finally it is possible to machine the flycutter body eccentric in order to retain as much material around the tool as possible. Some trimming can also be done in an attempt to balance the tool.Manage

Like

· Reply · 2h · Edited

--

Lawrence F. London, Jr.
lfljvenaura@gmail.com

https://sites.google.com/site/avantgeared