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Measuring when acces is not simple - colision free


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I know this time will come i have two questions witch i have no idea how to solve

have to measure this radius down there
i have correct styli
but its going to collision with any CP and any retract i set for it
I heard something about some points what should i search on forum for this ?
4351_75f675c93d9fc12c65418cca415d698f.jpg
Another question is about entering small hole i want to slow it down but it slows down ... just when it hit my Z=0 witch is the what is too late.
But funny its coming out very slow so i'm happy to not have collision after measurement 🤣 🤣

I could do it simply and easy on PC-DMIS but have no idea how to do this things here in Calypso
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I think what you are looking for is a position point.
Manually drive the stylus close to your feature and click on the Position CMM without Probing button in your strategy. You can add multiple points before and after measurement if you wish.

Position Point.JPG

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Plan > Navigation> Block Edges

Click these 2 boxes and then your probe paths will magically "go around" the clearance cube.
Clicking extra boxes can cause issues, these 2 are my default, ive never had to click extra.

I'm going to assume your clearance cube is set correctly......
.
All you should need to do is set your clearance group to say -Y (if the probe head come toward you) and set the correct active probe tip and you're golden. No need for cnc points.

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  • 1 year later...
Thank You
i used it a long time and it worked but sometimes, there have been some exceptions - usually when changed some clearance distance or something ... it was fine.

today i have this cylider thru whole part and L-stylus witch i want to catch just 4 points make plane and measure distances.
For first point i have problem what it goes nicley with my CMM Position and later it goes to colision on Y+
I tryed thesame on X+ with same results, tryed also differend clearance options but i did not found correct settings.
What i'm doing wrong ?

Art:
Red - stylus
Orange Cylinder 4351_06cd0c88eee15a01d51b6a6ac3c5186e.png
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The amount of times I have seen programming with the default speeds (300mm/s) rocketing into holes is too high. Obviously time is money and proving out programs is a must but I cant even look at a part where the stylus goes flying into a hole full speed without flinching. Especially if its a hole pattern around a bore or something, and the rotation could be off.. I have my programs "safe" in the sense that if the stylus is going into the part for anything, it is slowed down considerably. Like measuring steps down through a bore, I set the clearance distance as it enters the part, not before each feature, and then set those speeds to say 20mm/s. I have seen some crazy collisions and the extra few seconds to measure a feature and not have to worry about trashing styli is worth it to me.
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Leave the speed as default. The speed setting is then established by your global speed setting at measurement start. If you want to approach the hole slowly, I suggest using "bore missing". Set the clearance distance to a value that is safe from the STRATEGY location to the SAFE point above surface + probe rad. IE. If your scan is 1.5 deep using a 2mm diamter stylus, you'll want a 2.5 clearance distance minimum. This will slow the approach down and prevent breakage in the event of contact.
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That is one way to do it, but I like to have greater control over each features speed and behavior during measurement. The bore missing feature is OK, and yes it is nice that the program will continue if the feature is not where it is supposed to be but the con is that it is only available on the circle feature. As mentioned previous, imagine I have a couple of narrow steps inside some bores (think like the inside of a pump housing). Yes the base alignment (robust) should keep me clear from styli slamming into things they shouldn't be slamming into, and I can use formulas to set the diameter of my circle path for the steps to be inside the measured bores even if the whole thing is machined off center. But I just don't like seeing the stylus disappear inside a part at 300mm/s. So I will increase the clearance distance to those steps, adding however much distance I need for each step to ensure the probe tip isn't moving at Mach 1.2 upon entering the part. And then as pictured above in the measurement plan editor features window, selecting individual features and setting the speed there for when I want the "brakes" to come on before measuring a feature (lets say turning the speed down to 20mm/s).

I also like doing it that way because most importantly, it looks cooler 😃
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How do you change the default speed in calypso?
My offline seat has a default of 300, which is very fast, but the online computer has a default of 450, which is so fast it will cause the head to error out as a collision when using larger probes.
So my final step in every program is "feature settings editor", and it includes changing my speed to 30, which is plenty fast enough for a prototype shop.
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You can control the entire measurement plan speed in the Run Screen.
659_2117713edc8073af5d9d769d5264581b.png
I have ran many Accura IIs that have a max speed of 460, and never had an issue like you are describing. It sounds like you have an issue that needs to be addressed. I would suggest speaking directly with Zeiss as this should not be the case.

And I use some HEAVY stylus systems.
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The setting shown by Richard is the MAX speed setting. The highest value is the max speed for the CMM in the machine tab. Lowering the value effectively sets a limit to the CMM speed.

If you need to slow down a specific feature or group, this is best established in the Features Settings Editor.

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It is also available for a cylinder feature but only accessible in the feature settings editor. But I see your point. Your best method in the mentioned situation is localized speed setting.
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