Every time one must remember to click option "Do not Merge!" if he wants to keep the parts separate. DesignSpark Mechanical tries automaically merge solids which touch each other. There's some extra lenghth which is easy to cut off, if needed. Our circle is just under -90 degrees rotation for pulling it to a cylinder. The Move tool creates a copy, if one holds Ctrl when moving or rotating. We make a 180 degrees rotated copy of the heliz. We input here length 50mm and pitch = 20mm, no tapering: We take the pull-tool, select the triangle, select pull mode=Revolve and cross in Revolve options "Create Helix". The same parts after stepping out from 2D sketching: They are a line (=the axis, no need to have the exact length), a triangle (=thread profile) and a circle to be extruder to a cylinder: We place only the threads onto a cylinder, we do not make standard threads which in practice are lathed into the cylinder and have symmetrical and rounded top and bottom,Īt first sketch in 2D the needed parts. I guessed that you want a double threaded screw in SketchUP So, we make one in DesignSpark and save it as *.skp. That program is a heavily simplified version of SpaceClaim. I have several times recommended DesignSpark Mechanical, which is clearly made for beginners and exports well SketchUP format files. But that's already well presented for example in YouTube tutorials.Īnother way is to take some simple 3D CAD program which knows the helix. It must be built in pieces.Fortunately a half thread is relatively easy to do. Making a helix is little tricky task to perform with SketchUP because that program does not know helix. Another is only rotated 180 degrees around the axis. Double helix is two helixes with the same axis.
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