Calculating the flatness of a surface using LV?

[RWiersma]

Hello,

I have a problem that someone with more math prowess than me can hopefully help with:

I have five contact measurement probes contacting a circular part, checking the height of the ring (all probes face the same general direction, hitting the same face of the ring).

My next challenge is to report flatness of the surface, and my question is.... is there a canned forumula in LV for surface flatness? I'm not a math whiz, so I'd rather use a canned formula rather than crafting it myself.

(The five probes are equi-distant about the circle, spaced at 72 degrees).

Any suggestions?

Thanks in advance.

[Timothy 123]

Hi,

I assume that the probes are measuring the distance from soem referene point say z = 0 to the point of contact call it z_1. The difference between those would then be z_1 - z_0. You could then plot z as a function of position (which is around a circle). I would use cylindrical coordinates z(r,thetha). So then I could plot this and do some further analysis. I don't know if labview has this built in, but I know there functions for switching back and forth between different coordinate systems.

See the following message:

http://forums.ni.com/ni/board/message?board.id=170&message.id=210326#M210326


I hope that helps.