yang686526

use of equal space as a basic dimension
are there users of the asme y14.5m who have had occasion to apply equal spaced to a holes located on a basic dimensioned diameter? i had thought that was an antiquated and retired term for dimensioning.
and if you have, did you put the block around it to indicate it as a 'basic locator'?
this was discussed, kind of, a few months back - take a look.
my opinion would be to use 6x 60° (basic) or similar as generally shown in asme y14.5m-1994.
however, i don't think it explicitly contravenes the standard.
back in the uk we said equispaced not equally spaced, sounds cleverer to me.
kenat, probably the least qualified checker you'll ever meet...
ringman,
the standard shows angle times quantity, over and over again.
i think this is in the same category as the typ specification. the standard requires that you specify actual numbers. on cad, i would think it would be easier to go 6x60deg, i.e. do it properly, than it would be to draw a box around a note, especially if you are not a touch typist.
jhg
i had rather expected a yes or no response with a possible follow up to the questions that i asked.
sometimes communication, whether it be written, symbolic, or verbal is perplexing.
has anyone used this method? and if so, was a block used around the eqlsp?
i am not in favor nor proposing that it be used but apparently is is being taught as acceptable by some.

the main point of my post was to get you to look at
kenat,
thanks and i did not recall having seen that thread although i did post to it.
it concerns me that some instructors for the gd and t are promoting the use of equal spacing in conjunction with basic dimensions. it seems be confusing and misleading.

drawoh has got it right. quantity x value in the box. i like, and have used the example in figure 5-43 (page 141) when the quantity is such that it gives you a fractional value. this used to be done by "equally spaced" in ancient days. works well on flange hole patterns for example.
i hadn't noticed that example before ron, thanks.
kenat, probably the least qualified checker you'll ever meet...
ringman,
let us assume the drawing contains the note "interpret dimensions and tolerances as per asme y14.5m-1994", and assume that the pitch circle has a note saying "eqsp" contained in a box.
if someone applied an angular dimension, and they replaced the angle with the text "eqsp" and they put a box around it, i would interpret it as a basic dimension. if i were the checker, i would reject the drawing of course.
if there were a boxed note next to the pitch circle dimension saying that holes are equally spaced, i would not know if the drafter was simply trying to draw attention to the note. this is very poor drafting practise.
you can apply a note to the drawing or view stating that all dimensions are basic unless specified otherwise. that way you can do the good old fashioned note ".375dia holes thru 6 plcs on an 8.875 b.c.d.". hopefully, everyone will know what b.c.d. means.
all of this is a lot more work than showing the pitch circle and one angle times the number of holes.
jhg
only englishmen, or guys like me that worked for an british engineering manager know what bcd is. i used to tick him off by refusing to use it, and saying it was totally redundant.
checkerron,
okay, hopefully somebody knows what bcd stands for. perhaps even i do!
jhg