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Level

Lay Out Large Arcs in Confined Spaces with No Access to Circle Center

Arc Width


Increment
Offset
If you're laying out a large radius arc in a confined area and can't reach the center of the circle, enter arc dimensions below to find lay-out points in the curve.

Also see Printable Arc Templates to create printable paper templates for smaller arcs.

Left click, release and drag to measure at scale in diagram.

Height
Increment Scale
Set Out a Large Arc in a Confined Space with No Access to Circle Centre
Inside Arc (right side bottom of diagram)
Mark-out

Outside Arc (left side top of diagram)
Mark-out

Print Full Scale Template to mark curve between increments

Template Width




Calculate Arc Height and Width From Radius and Sweep Angle

Radius
Sweep Angle °
If you know the Radius of your arc, and the Sweep Angle, and need to find the Height and Width to draw the template, enter Radius and Sweep Angle and hit Calculate Height to calculate the height and width of the arc.
Enter the Height and Width (Chord) above to draw the arc template.

Sweep° Radius Scale

Calculate Arc Height and Width From Radius and Sweep Angle

To set out a large radius arc in a confined area, enter either the maximum height of the arc (above centre of chord), or the radius of the arc, and the increment along the chord line for your set out points.

The smaller the increment, the more accurate (and smooth) the arc line will be.
Mark the base 'chord' line and increments from centre outwards, and measure 90 ° to the arc points to form the arc.

To make sure the measured points are square off the base line, mark another line parallel to the base line (above or below), square a line through the centre, mark corresponding increments and line through both increment marks to mark the arc points.

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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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How to Print Large Templates over multiple pages.
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Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
And if you're cutting wet, wear a mask - there's dust in the spray mist too!


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