Kink Point

[[To...]]

Hello everyone. I use Step Point often with good success but I just can seem to figure out the Kink Point. I'd like to try using it to figure out the with of this .008" slot. Can anyone explain how to use Kink Point for this application. Yes, I have Curve.

Screenshot 2021-11-30 090507.jpg

[[Ch...]]

Tom,

Hi. While I have not had much success with step and kink points,

There is another way to get the width and depth of this slot with intersections ... which you're probably aware of.

[[Ma...]]

I sometimes use one half of curve to create bestfit alignment and create theoretical point with this alignment.
Make curve just close to edge ( plus some distance for compensate start/stop of scan ), scan it, then just make copy of this, recall all points and just remove nominals to be closest to area.

So after two bestfits of sides you can measure those theoretical points.
Not sure if kink point can be used for this small area.

[[Ri...]]

I use the Kink Point a lot. Here would be my steps:

- Section the model to create a 2d Curve

- Create your 2d Curve from your section

- Extract the nominal circle and line

- Switch the nominal circle and line to Theoretical Features

- Measure the 2d Curve

- Create a Kink Point

- Use the 2d Curve as the nominal feature

- Use the the Circle as Feature 1

- Use the Line as Feature 2

- To switch which side it creates the intersection, switch Feature 1 & Feature 2 around.

[[Ri...]]

Here is a gif showing the steps for anyone new to Kink Points

[[To...]]

Maybe I'm missing something but I'm trying to avoid measuring the sides of the .008 deep slot. If it was just a flat, I'd measure a circle and a 2d Line and get the intersection points.

Screenshot 2021-11-30 131819.jpg

[[Ma...]]

I am wondering with what you want measure this 😮
It's 0,2mm - side could be about 0,16mm height - if you don't have sharp stylus, then i'm affraid that this you can measure only with optical. Or use caliper without cmm 🤣

[[Al...]]

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Can you please elaborate this a bit better. I'm struggling in making a kink point (actually I'm not I can create exact theoretical kink point where I want it but it doesnt measure it or calculate it).

I did both what Richard Shomaker said and with my own approach to this problem which is scanning both features (circles R10 and R21.5) on points which are in red circles on a drawing. It says "error during calculation of a geometry feature".

Same thing happens if I scan those circles separately and try to make an intersection. If I use curve on combination of both or more of them it will still error it out.

Snap 2024-02-05 at 09.40.52.png

[[Ma...]]

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Hi Alen 😉

First of all - this is such bad design - this engineer should be dragged out by ear 🤣 . This is best for curve.

Let me ask you:
Have you tried intersections with circles?
How much is diameter/radius fluctuating by repeating measuring of same part?
Do you have curve opt?

I would use intersections wit locked radius on circles if possible.

[[Cl...]]

There is a similar function in Calypso called "Step Point" that I've had
success with, in a similar situation. I don't know what your geometry
looks like up close. I would think that if there were radii at the corners
and not enough straight surface it might not work.

[[Al...]]

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Yes I have tried intersections with circles and it failed. Sometimes it calculates it sometimes it doesnt, same as with curve.

Well fluctuations are significant, I can't tell you by how much right now but pretty much.

I dont know what you mean by curve option. I have 2d curve and 3d curve option if that's what you mean.

Circles intersections was first thing I tried and it doesnt work right.

By using 2d curve and kink point it does almost the same as by using circle intersections, can't calculate it.

Step point doesn't work for me, I've tried it also. I think you can't use curves or something, I've forgotten already, but I know it didn't work.

Your previous post intrigued me, but I don't quite understand what you did there.

[[Al...]]

After all I did the following:
-measured every single element separately
-used radius constraints under evaluation
-used it's x-y coordinates instead of those kink points where it couldn't calculate them

In that way it measured everything in green as I was expecting in the first place.

But I would still like to find a way to measure it as per drawing, but didn't have time to try more experimenting.