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Problems constraining an arc (by Andrew McIntyre)
I am working on some 2D templates for sheet metal panels to be cut out on a laser machine.

The fabricator habitually inserts a 2mm drilling at either end of a fold to relieve local stress but I am having the greatest difficulty constraining the arcs needed to a achieve this.

My attempts to anchor the center or ends of the arcs with construction lines haven't worked - the construction lines misbehave.

Any suggestions on a viable technique will be warmly welcomed!
Sat Jun 25 2016, 17:11:17, download attachment Constraining a 2mm dia fold relief drilling.slvs
(no subject) (by Jonathan Westhues)
One option is to constrain all the arc centers coincident, and the arc endpoints horizontal and vertical, as attached.

You could also model the part in 3d, by extruding the part without the drilling, and then adding the drilling as a Boolean difference against full circles.
Sat Jun 25 2016, 19:13:57, download attachment drill.slvs
(no subject) (by Andrew McIntyre)
Great! That works fine - many thanks Jonathan
Sun Jun 26 2016, 12:25:24
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