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Wall
Framing 		Wall Framing
Openings 		Wainscoting
Design App 		Shaker
Panelling 		Shaker Stair
Panelling 		Baluster
Spacing 		Board Batten
Spacing 		Angled
Spacing 		Gable
Studs 		Kerf Spacing
Wood Bending 		Kerf Spacing
Ellipse Curve 		Woodturning
Segments 		Tapered
Staves
Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch
Hole
Spacing 		Plant
Spacing 		Shelf
Spacing 		Circle
Centers 		Boards
In Circle 		Paving
Circles 		Masonry
Arch 		Tile Fit
Spacing 		Tile Fit
To Floor 		Fence Spacing
Posts Panels 		Diminishing
Lengths 		Fastener
Spacing 		Brick
Gauge 		Running
Lay Out
Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch Inch

Kerf Spacing Calculator for Bending Wood See also: Kerf Spacing Ellipse

Curve Radius
Curve Sweep Angle
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Thinner kerf cuts will be spaced closer together giving a smoother curve. Wider cuts may give a curve with segments having sharper bends at the kerf cut.
Kerf Width
Wood Thickness
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Thickness of remaining wood after kerf is cut.
The optimum Minimum Thickness of wood to obtain the curve cannot be calculated. It depends on the type of wood, grain, dimensions etc.
Test with scrap first to perfect.
Min Thickness
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Board starts off straight, curves, then continues straight again.
Kerfs start and end at each end of curve.
See diagrams

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Curve is entire length of board.
Kerfs start 1 space in from ends.
See diagrams
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Cut kerfs with a router and tapered bit to remove gaps.
Rout test piece with tapered bit at required depth to measure Kerf Width entry.
See Tapered Bit Kerf Width Calculator below.
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Draw Curved Diagram with straight Facets between kerfs, instead of an even curve. Thinner kerfs will shorten distance between cuts, and lessen faceting effect. See Diagram.


Scale

Kerf spacing calculator diagram straight
Kerf spacing calculator diagram curved

Kerf spacing full scale template

Running Centres:
Mark-out

This calculator finds the spacing of the cuts (at entered dimensions), so when the piece is bent, the inside edges of each cut touch together to form the correct curve. The optimum depth of the cut, and thus remaining minimum thickness of wood to obtain the curve cannot be calculated. It depends on the type of wood, grain, dimensions etc. Test your dimensions and cut depth on pieces of scrap first, to perfect.
Geometrically, more, closer and thinner kerf cuts should give a smoother curve -- Less and wider cuts may give a curve with segments having sharper bends at the kerf cut. Please let us know your experience re: optimal actual curves, using different wood, min thickness, kerf thickness etc, so we can try to improve this calculator.


Tapered Router Bit - Kerf Width Calculator

Calculate Kerf Width here, then check Router Tapered and enter Kerf Width in top calculator.

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Taper angle per side.
Total taper angle = 2 times this angle.
Taper Angle °
Shank Diameter
Use smallest tip possible to reduce gap at bottom of cut !
Tip Width
Wood Thickness
Min Thickness
Scale


Calculate Curve Outside Radius and Sweep Angle From Width and Height

Curve Width
Curve Height
Sweep



Calculator Review: See more ...

I built a curved garden bench using the kerfing calculator to form the internal scaffold and the capping timber.

The round table the cat is enjoying also employed kerfing for the supporting structures. 		Garden Bench using Kerf Spacing Calculator

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If you need to take full scale measurements directly from your monitor, adjust the size of the diagrams on screen to match a ruler. Does not affect printed sizes. Use keyboard Cursor Keys to fine tune as you adjust scale.
Adjust scale of diagrams to measure 100% scale on screen with a ruler.

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All Inch inputs and dimensions are actual physical finished sizes
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Select output Fraction Precision then Re-Calculate to display.
Fraction Precision
Lumber
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Selected value is automatically copied to clipboard. Select then Paste into text box.
Prec…
0


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