huangyhg

use of centerlines
scenario:
creating a side view of a plate with holes in it. the holes go straight through the plate. the holes are fully dimensioned in the top view.
question:
is it necessary to draw (create) centerlines for the holes in the side view?
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no i would not.
i only do it if the side view is a cross section then i will. what communicates the depth of the holes on the print? do you have thru on the diameter? if you are trying to dimension to the centers on the side view i would say yes. but once again to be more clear i would have made a cross section.
i personally always apply centerlines in my side views no matter if there sectioned or not. center lines help to communicate that's it's the center of the dia/hole.
plus with out thumbing through the standard looking for it. i think its a standard that all dia's/hole shown in a side view should have a center line. i know one of you brilliant people out there will correct me if i'm wrong.
solid edge v20
it depends... will the centerlines add clarity to the part definition, or will they only clutter and complicate the view? a side view of a part with a handfull of holes is much different than a side view of a plate with hundreds of holes, yet if you follow the rule that "all" holes are to have a centerline, you will quickly have an unreadable drawing, and those centerlines will prevent clear communication of the part definition.
good to know you got shoes to wear when you find the floor."fff"> - robert hunter

just to clarify what i said, i just show what's needed in the side view's when it comes to holes. as ewh said, if you show to much with centerlines you can clutter the drawing.
as stated above, you should always apply a center line if your showing it in your side view, section or not
solid edge v20
sdeters
no i would not.
i only do it if the side view is a cross section then i will. what communicates the depth of the holes on the print? do you have thru on the diameter? if you are trying to dimension to the centers on the side view i would say yes. but once again to be more clear i would have made a cross section.
response:
the depth of the hole is communicated in the top view, which all are thru holes. location of the holes are dimensioned also in the top view. the only dimension i have in the side view is the thickness of the plate.
cadman1964
i personally always apply centerlines in my side views no matter if there sectioned or not. center lines help to communicate that's it's the center of the dia/hole.
plus with out thumbing through the standard looking for it. i think its a standard that all dia's/hole shown in a side view should have a center line. i know one of you brilliant people out there will correct me if i'm wrong.
response:
do you know where i could find the standard?
thanks guys or gals. i appreciate you taking the time to help out a fellow engineer. i was really hoping for an definative yes or no, but "clear communication" sounds like an excellent answer, and i agree. thanks again.
i agree...only if sectioned and if needed.
to add cl on every hole in every view just adds confusion and clutter.
chris
solidworks 09, catia v5
if the top (plan) view fully delineates the holes, i see no need to stick centerlines on a side view. most cad systems won't put them in, so it is extra work to do so.
if there is no depth called out on a hole (i.e. blind hole) then the hole is assumed to be a through hole.
the word "thru" is an unnecessary habit that many of us (me included)have developed in the past and tend to carry over.
there are cases on complicated parts where the word "thru" is helpful, such as some holes in a pattern being blind and others through, but in the op's case above i don't see the need.
quote:
most cad systems won't put them in, so it is extra work to do so
solid edge will put them in once you select the automatic center line command.
maybe it's me, being as middle aged as i am. i just re

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