Torsion Spring Construction
Torsion Spring Construction
(OP)
Has anyone modeled a helical torsion spring? What are the steps?
It seems simple - just a helix with a small space between each coil, and a wire "tab" bent at each end parallel to the axis of the helix, with a minimum bend radius of 2X diameter of the wire. Our attempts have produced parts that look the part, but with errors.
The helix is no problem, just that bend at the end...
It seems simple - just a helix with a small space between each coil, and a wire "tab" bent at each end parallel to the axis of the helix, with a minimum bend radius of 2X diameter of the wire. Our attempts have produced parts that look the part, but with errors.
The helix is no problem, just that bend at the end...





RE: Torsion Spring Construction
Hope it helps.
RE: Torsion Spring Construction
In short, we were put onto the “bridge” function in UG by the EDS tech support hotline, IR# 4823256.
In long, the spring we were trying to model is on page 315 Machinery’s Handbook, “Straight Offset” configuration. We reduced the number of turns in our helix by a fraction representative of the curve radius plus half the wire diameter. We created 2 planes, each offset from the ends of the helix by a distance equal to the bend radius plus half the wire diameter, both parallel to the XY plane. Then we created planes containing the Z-axis at an angle offset from the ends of the helix that would put our lines in the required position for locating the end tabs. We used “bridge” to create the 3D fillet between the helix and the line.
The rest is just a normal sweep. Worked great.