Cylinder Filter settings

[[De...]]

I have a few cylinders I am using a helix path to generate. We measure in LSQ with no filters and apply the filters on the Characteristic side. My question is in regards to Upr vs Wlc. Calypso defaults to Upr on cylindrical features. Recently one of my co-workers told me I should be filtering anything generated with a helix path as Wlc. Which is the better filter option for size evaluations, true position evaluations and perpendicularity evaluations?

[[Ja...]]

Either one should work fine. Just keep in mind that as your diameter gets bigger, so should your UPR setting, just like a linear line getting longer you need to change your cut-offs. UPR vs LC? Personal preference.

[[La...]]

Side note: Are helical scans permissible for what you are inspecting?

[[To...]]

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What conditions might exist where a helical scan would not be permissible ❓ ?

[[De...]]

I am not aware of an instance where a helical scan path would not be permissible. What am I missing?

[[La...]]

I had been told that as per ISO 1101 form control, helical scans are not permissible and the circle segments must be stacked. This is from my colleague that you know, Tom. After writing this comment I wanted to look further into this and I don't see anything explicitly that says helical scans are not permissible.

So, this could just be a bogus question that I asked!

[[An...]]

On the contrary, a helix trajectory generates much more information than single orbits.
Since there is a gap between the circular paths, in which no information / data is detected.
But helix tracks need a lot of time, depending on the diameter and length of the cylinder.

[[Da...]]

I run Cylinders all the time, It is the bulk of our work. I almost never use "cylinder" . I prefer to use multiple circles, then recall feature points into a Cylinder. Our ID grinders and Honers all want roundness and size at different places along the cylinder . Taper , bellmouth, and roundness at the chucking point all play a role in making things work. "cylinder" gives you only an average size and a form deviation. To get to the guts of a cylinder, it has to be broken down into circle sections any way, so by building it from circles you can get any info you want. It's just easier for us.

[[To...]]

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You can also do the same thing reverse. Create and measure the cylinder, and then recall feature points into circles.

When you recall your circles into a cylinder, do you correct the nominal values, specifically, the depth (or length) of the cylinder? If not, you could be short-changing yourself on some evaluations of that cylinder.

[[Da...]]

Of Course, also remember to use connect segments and prefilter as though it was a Cylinder