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chord geometry · slot patterns · 2·asin(w/d)
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CHORD
PATTERN
1.50 chord on Ø11.5
Find R: chord 6 + rise .375
Fill in
any two
— the tool works out the other three. Leave the rest blank.
Radius R
?
half the Ø callout
Chord
?
straight-line width
Included angle
?
degrees
Arc length
?
along the curve
Rise (sagitta)
?
chord to arc, at centre
CALCULATE
Verify against the print and dry-run before cutting. This does the math — you’re still the machinist.