Recent content by ligo

Ok, I got ya now. I thought you were referring to "just the views" without any dimensions or datums. And I agree, now that I see what you are saying. I tend to agree with your logic on baseline dimensioning methodology, I but I'm not seeing anything in Y14.5 to say so.

dtmbiz, As stated earlier in the discussion, clocking of the 2-56 holes in not relevant to the parts function. I'm not clear on what you mean by dimensions from Datum-C not being consistent between he top and bottom. Do you have a reference for Ordinate dimensioning not being able to have a...

Peter, Is this what you are saying?http://files.engineering.com/getfile.aspx?folder=7a9a48f6-95ba-4b71-9daa-eef19b92ee64&file=Datum_-_Pattern_4.png

Peter, I think your drawing is correct and says essentially the same as mine currently. However I'm not yet convinced that applying the note INDIVIDUALLY to the 4X 2-56 holes is accurate since there are 4 holes and not just 1. The section of ASME 14.5 1994 I refer to, applies a single counter...

Thanks Dean, you bring up some good and very practical points. Looking at it again, I agree either the 4X or the "OF 4" must go. One of the things that has troubled me all along with regard to the 12X INDIVIDUALLY notations, is that since I have used a detail circle that is already called out...

Looking more closely at 5.7c and fig 5-39 in Y14.5-2009/1994, The case in point there is for a single feature (counterbore) in relation to another single feature (hole). In my case I have a pattern of features (4 threaded holes) in relation to a single feature (hole). So not only was 12X...

Dean, I think you are correct

Dean, take a look at section 5.7c and fig 5-39 in Y14.5-2009/1994 did I miss-interpret?

Thanks for the continued input everyone! The pattern of large holes (really they are cutouts of different depths) could have a positional tolerance of much more than .020" and fill the actual need. The positions of the 4 tapped holes around the large hole are locationally important, but I...

A, C, D datums, That is what I had intended... Must be careful of automatically use A,B,C, even though I know I set datums up differently. Thanks. The holes are not thru, so there are 12 of the large ones, and 24 of the small ones. Thanks for pointing me to 5.7 and fig. 5-39. Somehow I...

See My attached jpg. Does this Datum/Pattern say what I want it to say? What I want it to say is: Give me a pattern of large circles located within .02 of Datums A,B,C. And around each large circle, 4 small circles within .005 of their basic location relative to each large circle the 4 are...

pmarc- Thanks for your input, I completely agree with you about using profile on datum A. It's been a constant struggle for me to convince people not to use flatness in coplanarity scenarios. There is constant concern that fabricators will not understand or ignore a profile callout, but will...

dittohttp://files.engineering.com/getfile.aspx?folder=695d9e3e-b583-468c-b5cc-474cbc4e6cf1&file=D0900648_Trillium_Pod_aLIGO_BSC-ISI_-_V2.pdf

apparently I can only attach one drawing at a timehttp://files.engineering.com/getfile.aspx?folder=5413efa4-72d3-4216-8fa4-512342494adf&file=D0900649_Trillium_Pod_Top_Hat_aLIGO_BSC-ISI_-_V3.pdf

pmarc, - I understood "relative to the single hole within positional tolerance" but in my effort to be brief in my reply I over simplified, thank you for noticing and reiterating, I made it look like I misunderstood. At this point I think I'm having a hard time envisioning a circumstance where...