Subject:
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Primitive tolerances
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 19 Nov 2003 19:23:35 GMT
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Viewed:
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1384 times
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Can someone tell me what kind of accuracy tolerances we should be working within
when it comes to scalable primitives?
http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=p/48/4-4ring3.dat
I have placed a hold vote on this ring. Most all the numbers are within .0002.
Is that acceptable or should the numbers be corrected. Can someone else give
this part a close look over?
dat file / prim-gen
.3916 -> .3915
.5221 -> .522
.7765 -> .7764
1.0353 -> 1.0352
2.7716 -> 2.7717
2.8978 -> 2.8977
2.9743 -> 2.9742
3.6955 -> 3.6956
3.8637 -> 3.8636
3.9658 -> 3.9656
I stopped tracking numbers at this point. There may be more that vary.
I have been comparing this part to what "my" primitive generator says. I need to
know if my primitive generator is giving us the correct numbers or not.
Also see this thread for some reference information.
http://news.lugnet.com/cad/?n=10209
Paul
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Message has 2 Replies:
 | | Re: Primitive tolerances
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| (...) My understanding was that primitives should have 4 decimal places of accuracy. However, whether or not this is the case, I think that any decimal places that are included should be accurate including appropriate rounding. Just my 2 cents. (...) (21 years ago, 20-Nov-03, to lugnet.cad.dev)
| | | Re: Primitive tolerances
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| (...) Generally parts only need to be authored to 3 decimal places. We decided on 4 DPs for the scalable primitives so that they could be scaled x10 without degrading the quality of the part. One could argue that p/48 primitves should be coded with (...) (21 years ago, 20-Nov-03, to lugnet.cad.dev)
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