1. Getting Good Diameter Short Circle Segments Zeiss Cmm 3
2. Getting Good Diameter Short Circle Segments Zeiss Cmm 2
3. Getting Good Diameter Short Circle Segments Zeiss Cmm 5

No point masking at start and end of scan, so if you're measuring say 15º of arc the scan may filter out a degree or more at the start & end giving you 10º to 13º arc.whereas the same segment with touch points would be the full 15º.Plusi have a Vast XT and my probe qual program is 13 points (x2 forces) on 180º of sphere, so if its good enough to qualify the machine then it should be good enough to measure a feature, and it is.FinallyI love using touch points just because it blows the mind of the calypso purists who think that anything & everything must be scanned. Its the teenage me (Gen X) just wanting to buck the system, and prove people wrong. The biggest issue I see with the measurement of a radius isn't so much the strategy, as the interpretation of what a radius tolerance actually looks like. Most CMM software, when outputting a radius tolerance, simply take the diameter of a circle or cylinder feature, and divide it by 2. This introduces all kinds of issues, as all of you know, with how the missing part of a complete circle gets created, often making a center point or axis that is way off.A radius tolerance zone actually controls the surface directly, more like a profile tolerance zone does.

24 Carl Zeiss CMM Guides Andrew Tool with Complex Mars Rover Project (March/April 2011) At Andrew Tool, CMMs have been an integral part of their manufacturing processes for years, but they had never faced a project with such intricate measurements, tight tolerances, heat treatments and a very short time frame requirement. The coordinate measuring machine (CMM) software converts these tip. Tests were conducted on a Zeiss and a Mitutoyo CMM to demonstrate the usefulness of the simulator. Radius calculating the normal direction for correction 2–4. Must lie on a circle of radius pcentered on point M. Good starting estimate for M. Moor, Pamela Murray, 'Modeling Coordinate Measuring Machine Scanning. Diameter, data filter characteristics, scanning speed, and probing force to enable the. Metrology companies such as Brown and Sharpe, Renishaw, and Mitutoyo. Scanning and thereby lower measurement uncertainty for short wavelength.

The tolerance zone is bounded by two arcs(the minimum and maximum radii) that the part surface must fall within. If the center of the radius is located via dimensions, the arcs are concentric.

Getting Good Diameter Short Circle Segments Zeiss Cmm 3

When the center of the radius is not located by dimensions(like a fillet), the arcs are tangent to the adjacent surfaces and create a crescent shaped tolerance zone. Wed May 29, 2019 7:57 ami have a Vast XT and my probe qual program is 13 points (x2 forces) on 180º of sphere, so if its good enough to qualify the machine then it should be good enough to measure a feature, and it is.But you're qualifying 180° on the sphere. The larger segment on any radius will help the result.Have you ever seen Dynamic Tensor qualification?

It scans around and over at 2 speeds after it finishes the Tensor.Regarding being called Zeiss purist, I feel scanning is not necessary for everything. I believe you match the strategy to the requirement.

Then, I balance accuracy requirement vs productivity requirement. Clearly, scanning allows one to collect more data which typically creates a more stable data set. Free sales commission agreement form.

I can't argue the issue regarding masking, but Aaron has valid solution though the size of the radius could affect scanning time vs several touch points. Though a larger radius would make me think about taking more points. I think the reality of this subject requires a study.I'm thinking the actual radius with a 15° arc segment isn't doing much more than resting on something or clearing something and so profile solves many of these types of issues. I invite anyone to enlighten me otherwise.

Wed May 29, 2019 4:39 pmI think if you're going to use constraints, you're better of to use Radius Measurement. If you constrain the circle, you're still getting an average or LSQ radius result. Radius Measurement gives you the radius value of each point in the circle constrained to its' center.I completely agree. That characteristic is a much better reflection of a radius tolerance. It just reports every point which can make your report look messy. I'm sure you could somehow report the maximum deviation of that Characteristic and report that.

So the way I would approach this is to definitely use a loop and just offset by the basic on the print. I usually don't offset in the loop itself but rather do an offset in an alignment as the first thing in the loop, but that could be getting g a little advanced.In the loop I would probably do a quick local alignment where I measured the left and right walls and built a midpoint out of those. Then just do a 'rotate to' in the alignment and pick the center of your part (whether that's an OD, ID, or center point) and next select the midpoint you made. This will set the axis to be squared up down the center of the teeth. From there you should be able to drive fairly accurately to the peak and vally. If those have some variability then I would take a couple of hits close to each other (like a really short line) and find the min and Max points of those depending on if it's a valley or peak.Once you make it work for one tooth then you can loop to get the rest. Just make sure you do the dimensions inside the loop too so they get created for each loop.Paste with pattern will also work but it's more of a pain in the ass if you have to change anything.

Getting Good Diameter Short Circle Segments Zeiss Cmm 2

Getting Good Diameter Short Circle Segments Zeiss Cmm 5

This may or may not make sense, but I'll give it a go.If that's a gear, or a bigger ring that has no backing; you could start the DCC to do edge detect based on backlight on a few bottom nubs and construct a circle, go for blackgreen. Same for top.If it has meat behind it, the toplight is trickier to grab the edge.Allign to the midpoint of the outer nub circle, and inner nub circle, check if they are about the same midpoint.I would then go from the midpoint to the theoretical 'troughs', and get another circle on the outer, and inner edges.At that point, you've got a bunch of constructed circles and peaks and troughs. Use two troughs and construct a midpoint to make sure you're underneath the top gear nub, and then construct an arc using those same two trough points and the trough circle. Construct theoretical midpoint on the arc, and then compare arc midpoint to the desired top nub peak.Printout the dimension as either a distance (line) or a position difference between the two as XY.It would be easier to compare the visual system to a CAD file, but you can automate grabbing a lot of those edges to sort of make a CAD file.Either comparison, Can loop and reset allignment in each loop if need be.