Standardized test shapes

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sliptonic
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Standardized test shapes

Postby sliptonic » Wed Apr 10, 2019 12:58 pm

I believe the first step to a better, faster, more reliable CAM system is better test shapes. If you aren't a programmer but want to help out, this is a good place to get involved.

http://cnctorture.xyz/

What do you guys think? If you agree, I'd like to pin this topic so it doesn't get buried.

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chrisb
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Re: Standardized test shapes

Postby chrisb » Wed Apr 10, 2019 6:15 pm

Go for it!
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Kunda1
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Re: Standardized test shapes

Postby Kunda1 » Wed Apr 10, 2019 7:56 pm

:+1:
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RatonLaveur
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Re: Standardized test shapes

Postby RatonLaveur » Thu Apr 11, 2019 7:00 pm

What a great idea.
It would also perhaps pave the way for further tutorials/troubleshooting goto for users.
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quick61
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Re: Standardized test shapes

Postby quick61 » Thu Apr 11, 2019 7:12 pm

Of course there's my +1 on this, but after going over the examples you already have, not sure what could be added. Maybe some "basic" mold shapes for the dropcutter / waterline? :?

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sliptonic
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Re: Standardized test shapes

Postby sliptonic » Thu Apr 11, 2019 7:41 pm

quick61 wrote:
Thu Apr 11, 2019 7:12 pm
...
...not sure what could be added.
That's a great topic for discussion! I can think of several areas that i've intended to work on and haven't gotten to yet:

  • Parts with features that need boundary extension
  • 3D drilling on a 4th Axis (outside of rotary)
  • 3D drilling on a trunnion table (inside of rotary)
  • Slotting features
  • Dovetail features
  • keyhole features
  • how about a part for a theoretical marquetry/ inlay operation
  • How about a threaded hole?
  • exterior threaded region for lathe
I'm sure there are many (many) more.
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quick61
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Re: Standardized test shapes

Postby quick61 » Thu Apr 11, 2019 9:47 pm

Something like this? Small threads are pseudo trapezoidal - large is a 3 start flute. Should work for both a mill 4th axis and lathe, with or without a forming tool. A little added extra, One end of the flutes (starts?) is on a curved surface. If it's something your looking for, I'll attach the model.
Screenshot_T&F1.png
Screenshot_T&F1.png (37.31 KiB) Viewed 1607 times
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sliptonic
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Re: Standardized test shapes

Postby sliptonic » Thu Apr 11, 2019 10:00 pm

Absolutely!

How about adding an internal thread to the end?
freman
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Re: Standardized test shapes

Postby freman » Tue May 28, 2019 2:56 am

Yes, I'm rather surprised that there are not standard NIST test shapes or something similar. I think I posted a question on CNCzone but did not get a lot of feedback.

I started looking for some test patterns last year but did not spend too much time on it since my hardware is not quite finished.

Making a repository is definitely a good idea , though I find it hard to believe that this does not already exist somewhere.

https://www.researchgate.net/figure/Mac ... 0_44020612

The classic "Diamond Circle Square" test and others:
https://wiki.shapeoko.com/index.php/Cal ... test_files

https://www.youtube.com/watch?v=CkZJ-zUqlhk
NAS979
https://www.youtube.com/watch?v=31uhPMY5Bes

Seems there are ISO tests but this link is a paywalled document. I guess some searching may find a copy.
https://www.iso.org/standard/54730.html

Here is a dimensioned ISO drawing which could be converted into a 3D model or Gcode machine file.
https://www.sis.se/api/document/preview/917991/

ISO 230-4
https://www.iso.org/obp/ui/#iso:std:iso:230:-4:en

This a bit theoretical but looks good:
https://arxiv.org/pdf/0910.1758.pdf

Ball-bar testing apparatus: interesting.
https://resources.renishaw.com/en/downl ... sts--99016
chrisb
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Re: Standardized test shapes

Postby chrisb » Tue May 28, 2019 9:48 am

freman wrote:
Tue May 28, 2019 2:56 am
Yes, I'm rather surprised that there are not standard NIST test shapes or something similar.
What is NIST?

I have the feeling it would be helpful, if you don't only provide lots of links and documents, but map your findings to FreeCAD, e.g. instead of
Here is a dimensioned ISO drawing which could be converted into a 3D model or Gcode machine file.
it would be great to have the FreeCAD file.