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# Planar Mate Question About Limits

Member Posts: 478 PRO
VERY confused as to how limits are restrained with planar mates. Which direction is 'x'? which direction is 'y'? how to locate part then change max and min? Someone understand this but I have been messing with this a for a very long time and cannot grasp the idea.

• Moderator, Onshape Employees Posts: 5,060
Hi @larry_hawes a mate connector has 3 lines with colours RGB (red green blue) equating to XYZ axes. It is the mate connector selected second that is used to define limits (if I remember correct).
Senior Director, Technical Services, EMEAI
• Member Posts: 478 PRO
Thanks Neil, That will help define direction but where do those limits start/stop? If I want to go from edge to edge of a part where are those edges and how are they defined in regards to limits? Is there an assumed '0' where the min and max are calc'd from and perhaps to? I can see the edges clearly but don't know how those edges refer to the limits.

• Member Posts: 478 PRO
I have stumbled on to some values that seem to work but have no definitive reference as to why they behave as they do. How would one locate a definite edge and use the limit/min/max to define that edge as the 'limit' of allowed motion? In this case I am moving the part along the 'x' axis of the planar mate but cannot seem to find a way to limit the motion to those definite edges.

• Member Posts: 478 PRO
In this simple example a slider mate is more appropriate but still challenging to find the right and left edge and why does the min define one direction's limit and the max determine another direction's limit? And still cannot find the exact edge distance to limit motion other than visually.

The assembly I am working on is proprietary but needs 2 planar mates to define its motion(s) with the same challenge of determining those exact limits.

• Member Posts: 478 PRO
I THINK I figured it out and thank you for your indulgence.