(New concept) Qualifying Disc probes with RDS XXT sensor.

[[Ri...]]

I would have preferred to speak with Tom Oaks prior to this, but I have no way of contacting him.

Credit for this new concept (new to me) goes to Tom Oaks because his documenting of qualifying Disc probes for RDS XXT sensors is partially used and prompted this new concept.

This new concept would eliminate the use of Ring gages to qualify Disc probes with the RDS XXT sensor and allow the programmer to create articulations along any necessary angle combination.

I have tested this method pretty well and the results are great, I have been using this concept for a while now (Monitored for accuracy during use).

Please see the attached word document and a sample CMM program, I would appreciate any feedback from fellow professionals.

Note: The example program needs fine tuning of the diameter values reported, I just chose not to finish that for an example program.

Creating and Qualifying Disc Probes for VAST-XXT using a Reference Sphere.docx Combo76R XXT Disk Probe Setup 25mm Ref Sphere.zip

[[To...]]

Hello Richard  I'll have to check this out.  The only reason I used a ring gage is that I wouldn't need to worry too much about the height of my circle.  With the Ref Sphere, I wouldn't know if I was exactly on the equator.  However, considering the tolerances, this may be adequate.

[[Ri...]]

There is a section or two that covers how to get the geometry to be on the equator.

The length of the SP probe vs the length of the Disk probe as X.

Sin of X for any angular articulation added to the length of the Disc probe or the value of X added to the length of any standard articulation (X, Y or Z).

I have rarely had to adjust length, and I found this is due to poorly made disc where perpendicularity was poor (Normal to angle of articulation).

[[Ro...]]

So the method I came up with to find the equator of the ref sphere...... Don't laugh... I take a piece of masking tape and apply it to a square at the height of the sphere. Blacken the tape with a sharpie and carefully transfer a smudge onto the sphere. Now you have a visual dot on the sphere that is about a millimeter around, of no practical thickness, and easy to remove. Then I can use that visual aid to take points "high side, low side" of the mark for disk probe qualification.

With a steady hand you can also put a mark on the top of the ball, dead center.

[[To...]]

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Missed that  😧

[[Ri...]]

I have been working on standard settings for best capabilities using Disk probes on the XXT Sensor.

Based on initial "New concept" I provided in this post.

Probe name: Combo90R

Ø14mm x 0.762 Disk with a 120mm extension. Total is about 140mm length.

I have a little more work to do on two articulations, not sure what the cause is right now, I have not drilled those down yet.

Stylus #3 is +X axis is A0B-90. (The first 5 articulations follow the standard 5 probes per the Red-Light image for probes in Calypso).

Stylus #6 is A0B-45 and Stylus #7 is A-77.5B-90.

Most of the diameters and locations I use this particular Disk probe on have quite generous tolerances.

My Sigma includes deviations of coords and diameters combined.

The goal is to achieve 30% or less across the board for GRE. I have conditional formatting for 30.001%-40% range that highlights a cell YELLOW.

In the "Reading" rows, a conditional format of any value exceeding 40% (Specific columns only).

My CMM program locates and measures the diameter of the Reference Sphere as a sphere, then I scan a circle feature on the center of the sphere (Respective axis) based on the sphere location.

Here is a peek at the latest data.

Combo90R Ø14x0.762 Disk.pdf

[[Cl...]]

I'm curious about the CNC Alignment1. Does that Sphere2 in the Planar rotation do what it's supposed to do?

Does it behave like a plane and if so, how would it behave in the Rotation in space? I ask because

I use the reference sphere in my calibration programs too but just for populating the origins (XYZ).

Edited October 8

[[Ri...]]

There are no "Planar Rotation" or "Rotation in space" features, just X, Y and Z.

In the original posted program, that was a Noob error. 😁

Spheres do not have "Planar Rotation" or "Rotation in space".

Edited October 9

[[Cl...]]

I saw that sphere in the planar rotation and was wondering "Does Richard know something I don't"? 🙂

[[Ke...]]

Not entirely relevant to the current setup being discussed, but in Calypso, a Sphere(any feature that can be reduced to a point, technically) can be used for a planar rotation control in an alignment so long as the point is not located at the origin of the alignment. The feature itself does not control the Planar rotation, but its direction from the origin does, and instead of having to make a line from the origin of the alignment to the feature and use the line as the planar control, Calypso does this automatically to save steps.  

[[Ri...]]

Damn... Who stole my notes? 🤣

 

[[Ri...]]

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Agreed, but in my Noob moment, A sphere that is positioned at X0.0, Y0.0 and Z0.0 cannot contribute to a Spatial or Tertiary existence. Unless it's like earth that has a rotating axis and gravity. 😂

[[Ri...]]

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(Morgan Freeman voice) Richard does not, in fact, know something Clark doesn't know.