Help Printing Directory Metric or Imperial

Set Out a Large Arc in a Confined Space with No Access to Circle Center

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.

Arc Width

Increments
Offset


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measure at scale in diagram.
Height

Radius

Sweep Angle °

Arc Area   ft²

Length around Arc

Full Circle Circumference

Full Circle Area   ft²
Scale
Height
Increments

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

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

The smaller the increments, the more accurate (and smooth) the arc line will be.

Mark the base 'chord' line and increments from center 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 center, mark corresponding increments and line through both increment marks to mark the arc points.



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 Angle
Radius
Scale

Calculate Arc Height and Width From Radius and Sweep Angle


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Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.


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