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Drawing Tolerances
Read 2271 times
August 07, 2009, 01:14:45 PM
I may be ignorant or just palin stupid, but I have a drawing that shows  unless stated a tolerance of +/- 0.05mm. I understand this to be if a size is 100.00 nominal the top size is 100.05, bottom size 99.95. I am having a bit of an argument with a contractor on this. It is one of his drawings. He claims the top size should be 100.025 bottom size 99.975.

Who is right? Thanks.

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CREO 3 and 5
SolidWorks 2017
TC2018 Pro Platinum.
TurboCad V21 Pro Platinum 64 bit. TurboCad V21 Pro Platinum 32 bit CADCAM.
TurboCAD 2015 ProPlat.
TurboCAD LTE/DoubleCAD Pro V7.
TurboCAD Deluxe V21 64 bit.
VISI 21 CADCAM
Christchurch, Middle Earth.


* August 07, 2009, 02:26:53 PM
#1
I may be ignorant or just palin stupid, but I have a drawing that shows  unless stated a tolerance of +/- 0.05mm. I understand this to be if a size is 100.00 nominal the top size is 100.05, bottom size 99.95. I am having a bit of an argument with a contractor on this. It is one of his drawings. He claims the top size should be 100.025 bottom size 99.975.

Who is right? Thanks.

You are correct. See page 15 of "An Introduction to Error Analysis", John R. Taylor. Rule for stating Uncertainties.

ISBN available from here...

http://www.chapters.indigo.ca/books/An-Introduction-To-Error-Analysis-John-R-Taylor/9780935702750-item.html?ref=Search+Books%3a+%2527error+analysis+taylor%2527



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WillR
SW:TC 21 Pro Platinum, FM15, 20 Pro Platinum 64 Bit, also V 19.1 64Bit & 32 bit 17.2 and 18.1; Furniture Maker 14 and 10. HW: Vista 64 Ultimate, AMD 1090 (6 core) 8GB memory Plus also an AMD  8 core systemFX


August 07, 2009, 04:17:48 PM
#2
Thanks Will. I also found this, attached.

[attachment deleted by admin]

Logged
CREO 3 and 5
SolidWorks 2017
TC2018 Pro Platinum.
TurboCad V21 Pro Platinum 64 bit. TurboCad V21 Pro Platinum 32 bit CADCAM.
TurboCAD 2015 ProPlat.
TurboCAD LTE/DoubleCAD Pro V7.
TurboCAD Deluxe V21 64 bit.
VISI 21 CADCAM
Christchurch, Middle Earth.