A simple problem maybe: I have an arch spline how do I extend it accurately?

SketchUp Pro
1

A simple problem maybe: I have an arch spline how do I extend it accurately?

2

You will need to attach your .skp file so we can open it and see what you are working with. Along with better explanation of what you mean by “extend”. Or at least a screenshot? Otherwise we are guessing with answers that may not apply to your situation.

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I don’t know what you mean by that, but with the scale tool you after grabbing the green grips you can just type the dimension you want it to have it followed by the unit of measurement, for example 2m if you want it to make it 2 meters larger or taller depending the grip you selected, it doesn’t matter if your model is set to inches, or feet, you just have to type the unit after the number and hit enter.

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I saw a video in the past, he extrude the arch z axis, then push pull it on the side using joint push pull, then extrude the needed face using joint push pull F button..

Edit: I tried, but it works on short extends.. And he used that technique for offsetting an irregular arch i think.