The Shop > Tools

Helix angle

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Jasonb:
The deeper your cutting tool the more clearance you need on the leading edge

Lew_Merrick_PE:
The convention is to perform your calculations on the Pitch Diameter.  This is not all that important with Square Threads (as opposed to Trapezoidal Threads), but it is worth habituating yourself to using.

(Thinking Radius) pi X Pitch Diameter = Pitch Circumference.  The Lead (.125 inch, in this case) is the advance per revolution (i.e Pitch Circumference).  Thus, the Helix Angle = tan-1(Lead/(pi*Pitch Diameter)).  [Correction]

chipenter:
Grind from a round tool bit and turn it to whatever angle you want .

mklotz:

--- Quote from: Lew_Merrick_PE on June 20, 2016, 11:41:29 AM ---...
2pi X Pitch Diameter = Pitch Circumference
...

--- End quote ---

Come again?  C = pi * d  = 2 * pi * radius

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