how to call out a stencil or a sheet metal part 1

[criznate]

Hey guys I work with sheet metal parts ect... I recently had an issue come up. I recieved some prints from the customer. It consist of a detail print and one child. On the child which is the print to be mannufactured did not call out any stencil to be marked or stamped during manufacturing the part, but if I look a the assy they call out stencil by showing a box with dashed lines and a notation to stamp or mark, but there was no notation saying farside or nearside. Correct me if im wrong but to my knowlege the stencil or marker should have been called out of the manufatured part print and not the Assy. Some one told me that the lines are hidden of the box showing the stencil on the ASSY. and should be to the inside. I disagree with this just becuase the lines are dashed does not always mean the stencil is hidden. Then stencil is where they want the part number stamped. Let me know if there is a standard that the stencil should be called out. Thanks Alot!

 

[KENAT]

Without looking at ASME Y14 series but based on common practice I've seen...

There's nothing wrong with calling up the marking on the assy drawing. Often the same piece part will be used on several assemblies and marking belongs at the assy level. In your case if if said stamp or mark with Part Number they want the assy part number, not the piece part number, this may be why the marking was at the assy level.

However, if you were only contracted to make the piece part that doesn't have the marking then I wouldn't have expected you to put the stencilling on. If they wanted you to add the stencilling from the assy to the piece part then ideally they'd at least indicate on the Purchase Order that you were to make the part & apply stencilling detailed on the assy print.

The fact they sent you the assy print implies they were expecting you to use it for some reason or another, but it should have been explicitly stated somehow.

As regarding the dashed line. It's fairly typical for marking to be indicated pictorially by a 'dashed' or some kind of chain line box. This normally has nothing to do with nearside or farside but is just to make it clear that it isn't a feature (such as a cutout) on the part. Normally the line type used isn't the same as hidden line type. If there is no note saying 'far side' then I would expect it to go on the side shown, I wouldn't expect them to explicitly say 'nearside'.

KENAT, probably the least qualified checker you'll ever meet...

 

[criznate]

Ok thats what I figured as well. The assy print was sent aswell becuase we are assy the part here. I took it as he wanted the assy number stamped and not the child part number. Thanks alot for clearing that up. I believe that to be true from the asme y14 standards.

 

[4zengineering]

I've run into the same situation with regards to assemblies and compoenents. Generally, we only mark the assembly (on what used to be one component)where indicated, after all the parts have been assembled. Usually that's what's clearly indicated on the assembly print.

We mark many of our parts per AS478, and somewhere in there it explains that the dashed lines are just an indicator of the zone where the marking is desired. We interpret this as "NEARSIDE" (hopefully correctly), unless otherwise specified.

 

[TheTick]

If the scale was small enough, the dashed line could be indistinguishable from a phantom line.

What did your contract specify was to be made? Single part to print? Were you contracted to make the entire assembly?