CREATING A SPECIFIC FINISH NOTE for a -1 & -2
CREATING A SPECIFIC FINISH NOTE for a -1 & -2
(OP)
We have a part that is used in two (2) different ways. It is basically a mounting bracket made of aluminum sheet metal, bent @90 degrees.
Mechanically/Functionally the only difference between the two (2) parts is that one utilizes threaded inserts and one does not.
We have a -2 version (front/top/side/rear views shown in drawing)
- this is just the bent sheet metal with a few holes drilled into it.
- we give the overall/envelope/hole/bend dimensions.
- we call out masking of surface areas for grounding.
We have a -1 version (isometric exploded assembly view shown in drawing)
- this is the assembly consisting of the -2 bent sheet metal part and couple threaded inserts.
- we call out masking of the insert threads.
In the drawing notes we call out finish instructions separately.
First the -2 finish note; dictating the masking of surfaces for grounding.
After that comes the -1 assembly note; dictating the assembly of the -2 part and the inserts; which together creates the -1 version.
Then we give the -1 finish note; dictating masking of surfaces for grounding and insert threads.
THE ISSUE:
The -2 finish notes only apply if the -2 is used as the final product in the parent assembly.
The -2 finish notes do not apply if the -1 version is used in the parent assembly.
Does anyone here have any experience with use of such drawings?
I was thinking of the -2 finish note containing something along the lines of: "-2 FINISH: THE FOLLOWING FINISHING STEPS ARE ONLY TO BE APPLIED IF DESIGN ACTIVITY CALLS FOR -2 AS THE FINAL ASSEMBLY"
But I'm not sure if that is sufficient, or maybe it should be worded differently?
Maybe prior to the -2 finish note should be a note to explain the subsequent notes to follow?
Mechanically/Functionally the only difference between the two (2) parts is that one utilizes threaded inserts and one does not.
We have a -2 version (front/top/side/rear views shown in drawing)
- this is just the bent sheet metal with a few holes drilled into it.
- we give the overall/envelope/hole/bend dimensions.
- we call out masking of surface areas for grounding.
We have a -1 version (isometric exploded assembly view shown in drawing)
- this is the assembly consisting of the -2 bent sheet metal part and couple threaded inserts.
- we call out masking of the insert threads.
In the drawing notes we call out finish instructions separately.
First the -2 finish note; dictating the masking of surfaces for grounding.
After that comes the -1 assembly note; dictating the assembly of the -2 part and the inserts; which together creates the -1 version.
Then we give the -1 finish note; dictating masking of surfaces for grounding and insert threads.
THE ISSUE:
The -2 finish notes only apply if the -2 is used as the final product in the parent assembly.
The -2 finish notes do not apply if the -1 version is used in the parent assembly.
Does anyone here have any experience with use of such drawings?
I was thinking of the -2 finish note containing something along the lines of: "-2 FINISH: THE FOLLOWING FINISHING STEPS ARE ONLY TO BE APPLIED IF DESIGN ACTIVITY CALLS FOR -2 AS THE FINAL ASSEMBLY"
But I'm not sure if that is sufficient, or maybe it should be worded differently?
Maybe prior to the -2 finish note should be a note to explain the subsequent notes to follow?





RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
The fact that actual physical features/geometry is different makes me think it should be separated. The use of -1, -2, etc, is of use when the part is identical up until a point (pre-finishing). However, your part is never identical, since one has drilled holes and the other has threaded holes and a helicoil/thrd-insert.
It seems to me that combining them with "except" notes would cause more confusion than not. I would probably create a separate set of drawing views for the -2 with a note saying "Identical to -1 except as shown"
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
another day in paradise, or is paradise one day closer ?
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
Attached is the drawing for more clarification.
The only difference between the -1 and -2 are the finish steps and that is due to the fact that threaded inserts were added to create the -1.
The -2 is the base part of the -1 assembly. There are no physical changes to the part other than adding the inserts.
Typically in our shop this drawing shows two (2) versions of a single part and would not be two (2) separate part numbers. You cannot have the -1 without building the -2 first.
The masking dictated in the -2 finish is also, by default, applied to the -1 version with the addition of masking the threads of the added inserts.
-1 is used for applications that would required threaded inserts
-2 is used for applications not requiring threaded inserts
All I'm trying to do is dictate that for use of -2 as the end product you do not proceed to the -1 assembly and finish notes. I just don't know how to properly write it in technical terms.
Is tabulation in fact the proper way to convey this information? Or can I use the existing notes by adding a little more information?
EDIT: I now realize that I may need to attach a bigger file, apologies if it cannot be read clearly.
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
It sounds like the sheet metal part is not yet coated when the inserts are installed for the -1 assembly, but the -2 part (sheet metal without inserts) is coated. If so, then the -2 part is not really a subcomponent of the -1 assembly, is it?. Perhaps you need a -3 part which is just uncoated sheet metal.
Or perhaps I've misunderstood this all. A readable drawing might help.
pylfrm
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2
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RE: CREATING A SPECIFIC FINISH NOTE for a -1 & -2