Repetitive Features and Spacing of Holes

[FlyingGrimReaper]

I found this thread closed and was trying to understand proper standards with regard to ASME Y14.5.

thread1103-200390

The previous thread mentioned proper labeling with regard to screwholes. However, I am currently at a phase where we have not determined the type of screws we are using and therefore we have simplified the drawing.

My question is what exactly is the callout for equidistant holes? (e.g. spacing of 20 X .25 diameter rivets with 1 inch spacing from each other on the horizontal and vertical)

My initial assumption was to have a baseline and label the distance of each hole from the baseline (now I'm showing my rookie experience). It seems that by doing it this way would clutter the drawing and cause more frustration, instead of providing a clear and descriptive drawing of my model.

 

[drawoh]

FlyingGrimReaper,

You show your rivets on the drawing, and show the distance between the first two as 19X 1.00.

You apply a note or an item balloon to the rivet. Also, you apply a fairly sloppy GD&T positional tolerance.

This all assumes your rivets are in one row with all elements equally spaced.

JHG

 

[ewh]

A couple of aerospace companies that I worked with would only show the hole with a callout for the rivet. This facilitated ease of use of the CAD files. If the PL was automated, a point would be used to represent the rivet data.
As for dimensioning, drawoh is correct. We would also often add an overall reference dimension (if tolerances allowed. If the overall dimension needed more control, we would make the hole-to-hole distance reference and the overall hard. On aircraft, not all dimensions can be linear, and arc length dimensions are often used.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[FlyingGrimReaper]

Thanks for the info, that helps alot, drawoh, u saved me alot of time with that info, and plus the drawing looks clearer now

 

[KENAT]

If using ASME Y14.5-1994 then take a look at section 1.9.5 and the associated figures.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​