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PCD hole calculator

Bolt circle coordinates for jig boring, CNC drilling, wire-cut and punch layout. Angles run from the X axis, anticlockwise positive. Export to DXF, G-code, CSV or a signed-off PDF sheet.

Hole pattern

Medium fit · coarse pitch. Check against your standard.
0 = 3 o'clock · 90 = 12 o'clock
Checks punch-to-punch web

G-code settings

G81 cycle, G54, tool 1. Verify against your post-processor.

Job details for the sheet

INCLUDED ANGLE
60.000°
CHORD, HOLE TO HOLE
50.000
ARC PITCH
52.360
WEB BETWEEN HOLES
40.000

Work back from a measurement

Enter a measured chord to find the PCD — useful when the print has no PCD called out

Hole coordinates

HoleAngle°XYΔX from centreΔY from centreRadius
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Before you cut. These figures are geometry, not a process sheet. Confirm the datum on the part, check the G-code against your post-processor, and satisfy yourself that the web and hole sizes suit the material and the operation. If you would like us to review the layout, send us the drawing — the engineering review is free.

Questions

Common questions

How do you calculate the distance between two holes on a PCD?

The straight centre-to-centre distance between adjacent holes is the chord: PCD × sin(180° ÷ number of holes). For six holes on a 100 mm PCD that is 100 × sin(30°) = 50 mm exactly. The arc pitch, measured round the circle rather than across it, is π × PCD ÷ number of holes.

How do I find the PCD when the drawing does not give one?

Measure the centre distance between two adjacent holes, count the holes on the circle, and work backwards: PCD = chord ÷ sin(180° ÷ number of holes). The "work back from a measurement" panel on this page does it for you.

What is the minimum web between two pierced holes?

As a working rule the web between adjacent holes should be at least twice the material thickness for piercing. Below that the punch is prone to breakage and the strip to distortion. This calculator flags the web against your thickness if you enter one.

Can I export the coordinates to CAD or a CNC machine?

Yes. DXF gives you the holes, centre marks and the pitch circle on named layers for CAD or wire-cut. The G-code export writes a G81 drill cycle with your depth, feed and speed. Both are plain files — check them against your post-processor and your datum before running.

Need the tooling as well as the coordinates?

We build press tools, jig fixtures, moulds and gauges in Padi, Chennai. Send a drawing and you get an engineering view back within 24 working hours.

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