Mechanical Design, Manufacturing and Engineering Forum
[ Home ] [ Search ] [ Engineering and Design Database ] [ Resume/Job Database ] [ Product and Services Directory ]
[
Engineering, Design and Drafting Store ] [ Engineering Forum ] [ DFM DFA Training and Trainers ] [ GD&T Training GD&T Trainers ] [ Advertise ]
[ POSTING POLICY / RULES ][ Archive#1 ] [ Archive #2 ] [ Archive #3] [ Calculators ] [ Tell A Friend ]
Forum Moderators: randykimball, Administrator

TYP and REF.dimension definition on drawings Question
Post Reply   Forum
Posted by: doctorf

04/07/2005, 08:52:24

Author Profile Mail author Edit
Hello.
Could anybody explain me the mention of TYP. and REF. definitions of dimensions on drawings.
Thanks.






Post Reply | Recommend | Alert View All   | Next |

Replies to this message


Re: TYP and REF.dimension definition on drawings Smile
Re: TYP and REF.dimension definition on drawings -- doctorf Post Reply Top of thread Forum
Posted by: arifjc

04/20/2005, 08:12:06

Author Profile Mail author Edit
TYP means 'typical'






Post Reply | Recommend | Alert Where am I? Original Top of thread
Re: TYP and REF.dimension definition on drawings
Re: TYP and REF.dimension definition on drawings -- doctorf Post Reply Top of thread Forum
Posted by: Cragyon
Bart
04/16/2005, 19:53:56

Author Profile Mail author Edit
I believe Tunalover is correct saying that TYP is not recognized by ASME, however I do not see any major industry issues with using this on engineering drawings. Good design practice is to use to same size features on a part when practical. For example, to design in a radius of R.250 on part which may have ~ 250 or more radius features is a great idea. Using TYP to indicated that a radius of .250 is used all over the part could save considerable expense/time in counting the radius. Counting the radius's may actualy cause a problem at manufacturing or inspection in that should the count be wrong this could invoke a engineering change. Generaly, engineering change notices cost time and money.






Post Reply | Recommend | Alert Where am I? Original Top of thread | |
Re: TYP and REF.dimension definition on drawings
Re: Re: TYP and REF.dimension definition on drawings -- Cragyon Post Reply Top of thread Forum
Posted by: Tunalover

04/17/2005, 11:29:26

Author Profile Mail author Edit
doctorf-
We have a way of handling times when there are many inside radii held to one value:

Add a note saying UNLESS OTHERWISE SPECIFED, INSIDE RADII SHALL BE .06.

Likewise, if the same drawing has many outside radii held to the same value, then UNLESS OTHERWISE SPECIFED, RADII SHALL BE .06.







Post Reply | Recommend | Alert Where am I? Original Top of thread
Re: TYP and REF.dimension definition on drawings
Re: TYP and REF.dimension definition on drawings -- doctorf Post Reply Top of thread Forum
Posted by: Tunalover

04/16/2005, 17:21:23

Author Profile Mail author Edit
TYP is not recognized by the dimensiong and tolerancing standard ASME Y14.5M-1994 or the drafting standard ASME Y14.100 as a valid method for defining the number of places that a requirement (or dimension, or whatever) applies. To me it is old-dated, sloppy, and shows that the draftsman is too lazy to count the number of times the requirement (or dimension, or whatever) applies.

REF is sometimes used to provide a "soft" callout that is for advice only. The use of REF should be minimized and no decisions should be based on it (it tends to be missed when changes are made to the "hard" callout). Another method of indicating reference information is to enclose it in parenthesis.







Post Reply | Recommend | Alert Where am I? Original Top of thread | |
Re: TYP and REF.dimension definition on drawings Smile
Re: TYP and REF.dimension definition on drawings -- doctorf Post Reply Top of thread Forum
Posted by: bjhughes

04/07/2005, 11:15:53

Author Profile Mail author Edit
TYP on drawings is generally defined as TYPICAL. This is often used when there are similar features, and to avoid unnecessary dimensioning by the draftsperson.

REF on drawings is generally defined as REFERENCE. These dimensions are to be used as reference only.

Hope this info helps.

Take Care.







Post Reply | Recommend | Alert Where am I? Original Top of thread | |

Powered by Engineers Edge

© Copyright 2000 - 2018, by Engineers Edge, LLC All rights reserved.  Disclaimer