Wie langsames antasten?

[[Ka...]]

Moin,

Wie kann ich die Strecke des Suchweges langsam fahren lassen aber dennoch den Fahrweg schnell belassen?

Wir müssen mit einer 0,4mm Kugeln kleine kreisförmige Nuten tasten. Fahre ich die Punkte bei einer DuraMax mit Sterntaster in normaler Fahrweggeschwindigkeit (160) an, so ist die Geschwindigkeit im Suchweg immer noch zu hoch sodaß der Taster ab und zu mal abrutscht und das Ziel verfehlt. Stelle ich den Fahrweg auf z.B. 30 so klappt es aber der gesamte Fahrweg aller Punkte ist da so langsam was wertvolle Zeit kostet.

Beste Grüße
Karsten
 

Edited August 21
Wort "schnell" vergessen

[[Pa...]]

It isn't totally clear from your question what it is you want to do quickly vs what you want to do slowly.

One possible solution would be one set of probings at "slow" speed and another set at "fast" speed. You could also use multiple strategies inside of one feature.

Takes a little longer to program but gives the control you need.

Could you use self-centering to locate the holes, then PCM to probe a given radial distance from the hole center? Maybe with an Edge Point? as youIf it's just approach speed vs probing speed you're after you could use Clearance Distance to bring the probe from clear plane down to Clearance Distance at fast travel speed. You can set the speed of the feature as slow as you like and this speed will be invoked only after the Clearance Distance.

Does any of this help at all?

 

[[Ma...]]

Hi Pat

He wants to move fast outside the Clearance plane/Safty Cube and slow inside the Clearance plane/safty Cube

[[Ma...]]

What about bigger approach distance and low dynamic?

[[Ka...]]

Hello colleagues,

Thank you very much for your tips. Attached is a picture showing what this is about.
Safe probing of the plane with a 0.4 mm probe on a DuraMax is only possible if the probing speed is very slow.

As Martin wrote, I want to move quickly outside the clearance plane/safety Cube and slowly inside it. I set the speed via: Test plan editor Measuring elements->Travel paths->Speed so that probing works safely. However, this means that the entire travel path is also very slow outside the clearance plane/safety Cube. This takes too much time, especially when a probe change is necessary.

So how can I set the travel speed to slow within the safety zone and normal outside it?

Best Regards Karsten,

P.S. Sorry for late reply, I was out of order this Weekend...

 

 

 

[[Ri...]]

You will need a "Clarance Distance" other than zero. 

One thing you will need to know, once the Clearance Distance is set, the retract will be as slow as the approach speed for Circles, cylinders and torus.

Let's say you have a 6.00 Inch Clearance Distance and a 30-speed setting, your retraction will be at 30-speed.

I do not know of any method to avoid this.

[[Ka...]]

Hi folks

OK, it seems difficult for me to explain my problem. Unfortunately, my English isn't very good... I also don't know the names of the individual software components in English. I'll do my best:

Attached is a sketch for reference.
The safety zone is defined as 12 mm from the 3D model.
The safety distance is 10 mm.
The scanning path is 5 mm long.

This means that the safety zone is always 5 mm between the individual points.

I would like the speed in the scanning path (red line) to be slow. In the area before that, i.e. the safety distance and outside the safety zone, it should be fast.

As a numerical example:
Outside at 160 and in the scanning path at 30.

How do I set this up?

Thank you for your patience!
Regards
Karsten
 

[[Da...]]

Have you tried setting CMM positions at the point where you want it to slow down?

[[Ma...]]

Is using %dynamics way for you? I saw reduced approach speed when slowed down to 12.5%

Also it would be wise to measure circle in "Sa" place ( "Safety" ) and circle of your plane to get ideal circlular path. Of course if your shape is turned on one go, then it's waste of time to measure two circles.

[[Ka...]]

Hello,

@Dave: 
As I need to measure a plane a CMM point will work only for one point. Ido not see an other speed if I use a CMM point. Just a very short stop at the CMM point. All other will be done in normal speed. 

@Martin:
We use a DuraMax which means fixed VAST XXT sensor. 
The measuring force is set to sensitive and the dynamic probing to 50% for this measuring element.
The instructions manual state that the probing speed is only reduced below 50%. At <=10%, reliable probing is no longer possible. Overall, the section on ‘dynamic probing’ is extremely poorly described. It is completely unclear what EXACTLY happens with this specification.

The small surface is created in a single pass. This also creates a small undercut so that the surface is only 0.6 mm wide. This is why a 0.4 mm probe must be used here.
It is a star probe, which means that the probing is not stable perpendicular to the surface because we have a lever arm between the probe shaft and the probe ball. Due to the necessary contact pressure of the sensor, the probe ball moves slightly on the surface. If the probing is too fast, the probe ball slips very far and can slip off the material.

So there is really no way to directly influence the probing speed? That would be truly primitive programming!

Regards
Karsten

 

[[Ma...]]

Have you tried points instead of scan or this approach would be worse? For 11 points around it would make sense.

[[Ka...]]

Hi Martin,

Yes I use single points an no scan.
This is the request by our customer. The QS at the customer use an Mitutoyo KMG which hat an Renishaw PH10T sensor... Unfortunately this small plane is the primary orientation A. So we need as close as possible the same strategy of Quality check like our customer. No discussion about if this make sense or not 🙂
 

[[Mi...]]

What about using a search distance before nominal position (Suchweg vor Soll-Position)?

[[Ka...]]

Moin Michael,

I tried this, but it didn't work.

As far as I know, the standard search path for external elements is 5 mm. If the scanning path is shorter, this is reduced to the length of the scanning path.
The speed of the search path is somehow slower than the travel path, but still too fast for my problem. As far as I know, the speed of the search path cannot be influenced by the user.  How the speed of the search path is calculated is a secret known only to Zeiss 😞 

[[Ma...]]

Let's vote for adding speed limits to clearance planes.

I would like to see it functioning like this:

1. Default CP +Z normal speed
2. Secondary CP plane with customizable move speed.
3. Measuring strategy

What i know is unless there is something between CP's then it applies only the latest or the first one ( imagine CP +Z to certain height then CP +X to avoid move points )