Size doesn t matter

[[ni...]]

Hello,

 

I ve a part too big to be mesured in one time, I think I will mesure It in two times, through the two red circles I hope Accessible in the two postitions, and finish the rapport with excel and a calculator.

So do you have good practices, or advices  to do this ?

[[Sv...]]

The Base Alignment match function allows the part to be moved and everything measured in a single measurement. I believe the exact details of how this works are explained in the knowledge base.

[[ni...]]

Three hours to test base aligment match, and it still goes wrong, the last problem is the CMM after the match going to mesure or 10 cm above the part or 10 cm in the granit :)

I don't have much time so I 'll do with two programms, and a few PCM and it will be ok.

[[Ri...]]

You need to add Z points to properly control the Spatial Rotation and Z Origin for the Base Alignment Match. I've used it with great success on massive parts with small tolerances. 

[[ni...]]

it's worth with  Z points, but I've only a very tiny zone of coverage before and after the base alignement match, and the CMM don't plap the diameters at the good place and collision ...

[[Ro...]]

Where are your datums?

 

[[Ri...]]

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 You may need to perform multiple Base Alignment Match then as what you currently have isn't stable enough. You could potentially use something like the granite to help you. Either way, garbage in = garbage out.

[[ni...]]

Here is the Base alignement Match with some Z points on the granit. I mesure this in manuel, and the CMM collision at the first diameter (try to mesure in full width).

I  don't see where assign XY to diameters and Z To points. for me  is to calypso to do that ?

 

the parts are going to the customer, so I will try another time with another part ...

thanks for your time

 

 

[[Ca...]]

For anyone who comes along this post with similar questions. Here is an article that explains how to use base alignment match: https://portal.zeiss.com/knowledge-base?id=522718 - it sounds like in this case, though, it is a matter of what elements are selected to get the best results. 

[[Ja...]]

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Caitlin I have always wondered about this and never really had a clear path for doing it. So thanks for highlighting that resource because I think it will help me very much in the future!

[[ni...]]

Maybe I found something interesting in this article it is said that "the circles need to be PROJECTED TO A PLAN ON THE PART" 

 

 ZEISS Portal  "Multiple setup in one report - Base alignement match"

 

secondary question : how do you paste a web link in this forum, when I copy/past  the adress it paste "zeiss portal" !?

Edited March 19

[[ni...]]

Another try  (other part) without succes, I 've done a large surface of recovery, projection of the two circle, put Z points in first, and the CMM mesure the Z point , and try to mesure the first diametrer 1cm beside this position.

 

I have no guide when I move the part, Have I to respect the spatial rotation of the first Alignement, does it matter if I move the rotation slightly ?

 

 

Edited March 20

[[Do...]]

I've created programs on oversized parts in the past using additional alignments and an extra CAD model to get it all in one shot. 

1. Import your CAD model and establish your start/base alignments as normal. Program the features you need from the first setup on this model.

2. Import a second copy of the CAD model, translating and rotating to the same orientation except space it apart from the original in your desired axis (normally I do X+ shift a few inches). It won't matter how far you place it since we will manually pick it up on the machine.

3. Now when you want to establish your second setup, pick a few features that can be utilized in both setups (think plane, line, circle near the center of the part) and create a simple start alignment from the resources menu (Resources > Utilities > Alignment). Pick these features on your secondary CAD model. Be sure to to set these features to MAN mode under (Features Setting Editor > Man CNC Mode). These features will reference the Base Alignment. Be sure to add a programmable stop and move the probe to a safe position on your final feature before these manual points.

4. Now that the secondary start alignment is done, redefine your setup with a more robust alignment (typically I call this a secondary base alignment). You will use the second start alignment as your reference workpiece alignment. This will be CNC mode.

5. Program your remaining features on the second setup/CAD model. If you have dimensions that require data from both setups you can use Result Elements to calculate them (ex. overall length can be calculated taking the length from the front edge to a hole in the center and the rear edge to that same hole).

 

Ideally the run will look like this:

1. Set the part up on the machine.

2. Establish your start alignment, run the first side.

3. Probe clears to safe distance.

4. Move part to new location.

5. Take second start alignment, run second side.

[[ni...]]

Hi Don,

Thanks, I 've made a try and thats work for me. I don't have the environment in CAD so , I think only one CAD should work. And I could use result element, or make a alignement with a forumula in the translation and use point recall for feature, that's do the same (for me).

just a dummy question, why don't you use "base alignement match" ?

thanks

[[Do...]]

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I was not aware that it existed before your post 😂