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Point to Point along an edge Mate Question

Point to Point along an edge Mate Question

Point to Point along an edge Mate Question

(OP)
I have a pair of scissors in an assembly. In real life when they open and close the blades cross each other and due to the geometry of the cutting edges they actually only make point to point contact as they cross each other. The point of contact constantly travels along the curved cutting edges depending how far the scissors are opened or closed.

So, I have a concentric mate for the pivot hole, and a parallel mate for the flat part of the blades behind the pivot hole. How can I mate the point to point contact so the curved cut edges stay in contact as I drag them to simulate opening and closing??

Thanks,
tom

Tom Malinski
Sr Design Engineer
OKay Industries
New Britain CT

RE: Point to Point along an edge Mate Question

Use a motion-limiting "empty" part (no features) and mate its origin (point) to each scissor blade edge.

RE: Point to Point along an edge Mate Question

In real life the blades flex (or bend sideways at the pivot) when cutting. Is that the effect you are trying to achieve?

You may need to change the concentric mate of the pivot holes to a coincident mate between points at the centre of the "contact faces" of the pivot hole. (A concentric mate would force the blades apart). This, in combination with handleman's suggestion, should allow a pseudo-flexing movement.

cheers
Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Point to Point along an edge Mate Question

(OP)
Thanks guys, I'm not sure if the motion limiter will work along a spline edge of the scissor cutting edge, the edge of the scissors is curved. But I'm experimenting

Tom Malinski
Sr Design Engineer
OKay Industries
New Britain CT

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