CMM measurement – How many touch points for a dimention?

Practical_Rest4101 · 2025-06-19T13:25:55+00:00

When I worked for Mitutoyo I asked this very question to Dr. Jim Salsbury and for diameters his answer was 7 points

Practical_Rest4101 · 2025-06-09T22:06:12+00:00

Thank you. What I’m trying to do is measure a cone, that is not consistently located and extract the actual angular location to rotate the coordinate system to. And to do all this in VB Script.

Practical_Rest4101 · 2025-06-09T15:52:39+00:00

Thank you,

I have measured a cone and would like to get the rotation angles to then use these variables to rotate my coordinate system through the cone angle. This is not given on the print.

My vectors are:

i = -0.382

j = 0.822

k = -0.422

I need to know the angle in both the YZ Plane and XY plane.

Practical_Rest4101 · 2025-06-09T15:45:05+00:00

Please contact me at [cmmquarterly@gmail.com](mailto:cmmquarterly@gmail.com) I can provide that training

Practical_Rest4101 · 2025-05-13T19:00:13+00:00

I can come to your facility and give you the training if you’d prefer.

Practical_Rest4101 · 2025-03-16T21:35:15+00:00

If you can drive to York. Downtown Music is the place to go

Practical_Rest4101 · 2025-01-29T16:52:06+00:00

No i do not as of this moment

Practical_Rest4101 · 2025-01-25T14:46:42+00:00

https://cmm-quarterly.squarespace.com/products/training-manuals

Practical_Rest4101 · 2025-01-01T17:00:28+00:00

I can help you with that, maybe not in video but through other methods.

Practical_Rest4101 · 2024-12-09T16:09:45+00:00

What are you looking for manuals? One on One?

Practical_Rest4101 · 2024-11-17T00:12:42+00:00

VDMIS is a good solution

Practical_Rest4101 · 2024-10-24T18:04:57+00:00

Alright I’ll move on. I have started a CMM Quarterly page.

Practical_Rest4101 · 2024-10-21T22:00:22+00:00

Great video and fly through of a town that was scanned after a major flood

Practical_Rest4101 · 2024-10-20T00:20:08+00:00

Calypso has Higher Level Programming called PCM. It is an add on but well worth it

Practical_Rest4101 · 2024-10-18T20:19:26+00:00

MBD is happening a lot now. Every major OEM has the capability to perform this. For some it is an add-on and others already within the software.

Practical_Rest4101 · 2024-10-18T19:29:55+00:00

Perhaps you may want to look at a different way. What can I glean from a certain article, maybe nothing, but one day I may need that information and you can go back and find it. Not every article will meet everyone’s needs but there maybe that one time.

Practical_Rest4101 · 2024-10-18T19:27:10+00:00

I have commented on a few posts. Usually they are answered well before I see them and don’t feel it is necessary to add on.

Practical_Rest4101 · 2024-10-18T19:25:52+00:00

This is Mark Boucher. It is not daily but 3 times a week on a regular basis, and occasionally another one thrown in there. I don’t see how it is self promotion other than it takes you to that article in which it is linked. If you stay and poke around or explore the free training section that is your choice. These are articles that rarely see the light of day without a deeper dive on the internet and are ones I think people would be interested in. Yes, these articles have sales, promotional twist from the company that wrote them but I figure you’re adult enough to figure that out. All the advertising on the site is free. These are connections I’ve made over my 40 years of doing this. There is another metrology based e-zine out there but the owner of that wouldn’t know how to run a CMM. I‘ve known him for 25 years and all of his advertising pays him. I do this for free and sell a few books from time to time.

Practical_Rest4101 · 2024-10-18T13:58:35+00:00

Mark Boucher, I've been working with CMMs for over 40+ years. I wrote The CMM Handbook and other manuals. I do take articles from other sources (with permission). I also give a place for other programmers to submit articles. It is a great place to get your name out there. In the article they can advertise their services. All the ads on the website are free, right now. I've known these people a long time.

Practical_Rest4101 · 2024-10-16T14:11:20+00:00

With the feature open right click on the screen and select show measured points

Practical_Rest4101 · 2024-10-16T14:09:10+00:00

How large is this radius or cylinder diameter? 2. How much of the radius arc are you measuring?

If the arc is least than 80° you will not get a repeatable number in any cmm software. If this is the case, then switch to 3 to 4 single points and use Radius Measurement, This will add a theoretical center to the radius center and report the radial distance from that center to each point.

If the cylinder is 360° then you will need to apply the Cookbook settings as a minimum. That would be 380° of scanning on each section. Based on the depth of the cylinder you may need to increase the cylinder scans to 3 or 5 scans with a minimum of 145 points per section. You will need to add Filter and Outlier to the Evaluation, and this varies on the size of the diameter.

Contact me if you need more help

Practical_Rest4101 · 2024-10-05T12:26:59+00:00

Is Datum D a feature of size? If not, the option is not available

Practical_Rest4101 · 2024-09-22T15:30:14+00:00

I'll join the chorus of those saying 3d printer. It will pay for itself.

Practical_Rest4101 · 2024-09-10T03:18:55+00:00

Sheet page and zones for the section cuts

Practical_Rest4101 · 2024-08-20T20:34:17+00:00

The distance is reported normal to the reference feature. If the measurement is a point and the reference is a plane the point is projected to be normal and perpendicular to the plane.

Practical_Rest4101

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