Category: Rps alignment in cmm

Recently I've seen quite a number of posts on the forum discussing why sometimes the cmm software flips the primary axis direction alignment rotated degree to what it's meant to be and how to fix it. Many experienced users have provided various solutions that will work indeed, which really shows the good spirit from an open technical forum.

It's still my interest to compile an article on this very practical issue along with a few methods so new cmm users can learn from there. Flipping on the primary axis mostly measured as a plane is not something new, it actually happened to me long time ago when I was programming in Geopak, MM4, LK-Dmis, typically old, non-cad system. And this issue is also software oriented because I still remember that one very old dos based DEA system will flip the primary axis depending on whether your plane points were probed clockwise or counter-clockwise, which is so unique that you don't find it in any other cmm system.

With modern CMM system, usually equipped with powerful CAD interface, it's much easier to prevent your primary axis being flipped. But it could still happen due to various reasons, therefore I'd like to point out a few methods to fix it if that happens.

I believe this is lots of information already, so you can use any of these methods when applicable to make your programming life much easier. If you need help to take off some of your programming work loads, don't hesitate to contact me at: This email address is being protected from spambots.

You need JavaScript enabled to view it. As we saw in the first part of this article, several different algorithms are available for fitting circles to CMM point data. This article will examine the calculations that are used for additional…. All materials in this magazine are the property of CMM Quarterly and its affilate companies and are made available for the readers information but may not be copied, reproduced, or distributed for profit.

Please consider a donation to help with the costs of publishing this free magazine. Click here to donate. Primary axis flipping issue Written by Ray Xing. You may be interested in:. CMM Training.

rps alignment in cmm

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RPS alignment in PC-DMIS 2015.1 CAD++? HOW?

Posts Latest Activity. Page of 1. Filtered by:. Previous template Next. I used only alignment in the programs not used iterative and best fit previously. Now I received a new task to measure car parts in RPS according to drawing information. Where can I find a description about RPS? Thanks in advance.

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Tags: None. Comment Post Cancel. Search the forum for iterative alignments. There is a vast amount of information here that has been discussed many times over. Josh Carpenter.

What does RPS stand for? VinniUSMC commented. It's used in PolyWorks that I know of. Reference points are what they call the points used in the non-standard alignments. Plane-line-line, plane-circle-circle, etc are their own, separate alignment type. Originally posted by Josh Carpenter View Post. Related Topics. Guru's, I have a complex part that I would like to try and do an iterative alignment on.

The part has a Helix type shape to it and it is referenced Best Fit Alignment. We are starting to check aircraft parts and Iterative Alignment process.

rps alignment in cmm

Lets pretend I wanted to make a video instructing someone how to do a iterative alignment.The RPS alignment enables you to align a part to the CAD model by using a set of features to constrain the part's axes of rotation and translation. With it, you can:. If you have a drawing with nominal values in a transformed coordinate system, but no CAD model, you can create an alignment by clicking Edit Datum on the Parameters tab, and applying a transformation to the values.

When you over-constrain an axis, PowerInspect creates a best-fit of all the features. Click next to the check box to exclude the axis from the best-fit calculation. The button changes to. Lock Position to use the feature to constrain the position and translation axes.

To create an RPS (Reference Point System) alignment item

Lock Direction to constrain only the rotation axes. For example:. You can enter an offset only when the selected item allows it. For example, you can enter an offset for a probed circle, but not for a probed plane.

Axes can be locked in any arrangement; you can specify up to constraining items. If the alignment is over-constrainedPowerInspect creates the best-fit of the items you specified to include in the optimization, and reports their standard deviations in the alignment dialog, and in the Report tab. The check box has no effect when all coordinates in the inspection are collected with one measuring device in one position, or when the inspection sequence contains no constructed features.

With it, you can: lock a part in six axes and create a perfectly constrained alignment. Note: Guided surface points are available only when creating inspections for CNC and Manual machines. Parent topic: Alignments panel.Welcome to the measuringhero Community! Discuss your projects with other users and get help from our specialists. Privacy Terms. Skip to content.

Quick links. For the tertiary Ythey're specifying a cylinder as Datum C. I was planning to use a circle on cylinder C as the 6th target point to control Y, but now I'm questioning if I shouldn't be using a cylinder instead of a circle.

I know I can't use a cylinder for the RPS alignment but I was thinking I could use an intersection of the cylinder axis but to what? Can I use a theoretical X plane, located by the B points for my intersection? B1 and B2 both have the same X value relative to axis A. Or, should I just refer to the Base Alingment from above? Am I overthinking this?

For other features, that use A, B and C, my plan was to use the best fit bore pattern alignment. Sound ok? I've attached a cleaned up drawing so you can sort of visualize my application. How would you guys approach the alignment and the TP of C?

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Fitting the points is strictly forbidden. Then create a regular alignment but have it reference the RPS alignment you've already made, and drop your Datum C cylinder in the Y origin box.

Leave everything else blank and the alignment will refer back to the RPS alignment you made to constrain the other degrees of freedom. You could try to measure a circle inside the cylinder and see if there is a significant difference in location in the Y direction.

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You could also try to constrain the Cylinder in the Z direction in the alignment. With the form datum setting on, use an outer-tangential evaluation on the cylinder, and constrain it to that theoretical plane. Let me know if that doesn't make sense.Login or Sign Up. Logging in Remember me. Log in. Forgot password or user name? When to use what alignment? Posts Latest Activity.

Page of 2. Filtered by:. Previous 1 2 template Next. Bill is Up and Running. Hello guru's.

rps alignment in cmm

Is best fit a one size fits all solution? Does anyone use all alignment strategies and for what specific characteristics?

Quality 101: CMM Part Alignment

The answer I am looking for is: 1 alignment for easily defined datum structure features. My answers may not be accurate but that is what I am looking for. This type of alignment for this type of part.

Thank you all in advance. Tags: None. Josh Carpenter. Comment Post Cancel. The alignments covers many, many situations, even where you have much different numbers.

We call them Level-Rotate-Origin alignments. You can level to the axis of a cylinder, rotate to the vector of a plane, even origin in the center of a sphere. But the Level-Rotate-Origin methodology remains solid.

Best Fit: Best Fit simply takes your alignment features and spreads their error evenly between them. It's imperative to have features that control different directions. For example, if all your points are the same plane then none of them can control rotation around the vector sticking out of the plane. Iterative: This is a type of Best Fit and a type ofwith the special addition of automatic remeasuring of the alignment features in order to reduce probing error.

This is because not every casting blueprint or part will define the right datums for an Iterative, and you might use a Best Fit or even a The unique circumstances of each situation call for you to examine what you have and make the decisions about what tools to use, and the more situations you go through the better your decisions AND usage of the tools will be.

John Riggins. Just to throw in a thought; Whenever I see datum targets, I will consider using an iterative alignment.

This is usually 3 points for the primary, 2 points for the secondary and a single point for the tertiary. These datum points usually have basic dimensions locating them. With Model Based Definition the basics may not be shown, but they are implied. Using an iterative alignment forces the CMM to repeat measurement of these points until the actuals are within location limits that are definable.Whether you are looking for an entry-level model or already have experience with coordinate measurement systems and are now looking to improve quality assurance or increase This website uses cookies to improve the user experience.

By continuing we assume your permission to deploy cookies in accordance with our Cookie Policy. We use a coordinate system to describe the movements of a measuring machine. A coordinate system is a lot like an elevation map where the combination of a letter along one edge of the map, a number along the other, and elevations shown throughout uniquely describes each location on the map.

Another example is a street map with buildings shown. To walk to your hotel room at the Ritz Hotel from the train station your originyou walk 2 blocks along Elm street, 4 blocks on Maple and up 3 floors in the Ritz. This location can also be described by the coordinates 4-E-3 on the map, corresponding to the X, Y and Z axes on the machine.

These coordinates uniquely describe your room and no other location on the map. A coordinate measuring machine CMM works in much the same way as your finger when it traces map coordinates; its three axes form the machine's coordinate system.

rps alignment in cmm

Instead of a finger, the CMM uses a probe to measure points on a workpiece. Each point on the workpiece is unique to the machine's coordinate system.

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The CMM combines the measured points to form a feature that can now be related to all other features. The first is called the Machine Coordinate System. When viewed from the front of the machine, the X axis runs from left to right, the Y axis runs from front to back, and the Z axis runs up and down, vertically perpendicular to the other two. Coordinate Measuring Machines Whether you are looking for an entry-level model or already have experience with coordinate measurement systems and are now looking to improve quality assurance or increase Read More.

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