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Topic:   Negative Quantities for Assembly Part Level Comparison

By: StephenPosted on: Nov 13 2019 at 06:12:50 PM
Is there a way to create an assembly, with sub-assemblies having a negative quantity?
There are times when we want to compare two similar assemblies in order to find the difference at the Consolidated Part Level. Say to create an 'upgrade assembly'.
Would it be easy to remove the current restriction for a positive number and would it mean that the resultant consolidated parts view would show the differences both positive and negative.
Very useful in doing parts analysis.

By: SupportPosted on: Nov 14 2019 at 05:29:00 AM
It's simply not possble for an assembly to consume negative quantities of materials.

I really don't understand how that would help you to compare assemblies.

Do you altwady use that method in some other software? Or is it just an idea you're toying with?

Would it be possible for you to export to excel or use excel to create 2 small example assemblies parts lists with your negative quantities. Run your comparison and send those to us here showing the results you're trying to acheive.

I can understand a requirment to compare assemblies and if there was any demand for it then it's maybe something that could be added to MniMRP without fiddling with negative quantities. But if we understand what you mean then maybe we can discuss it in more detail.

By: StephenPosted on: Nov 15 2019 at 09:58:35 AM
I can certainly see why negative quantities would be confusing. I just thought it might work.
All that's required is a compare 'function. This would create two consolidated parts list, match Items, do the math and create a result list that would show just the differences in Parts and quantities. i.e. just the plusses and minuses.

I can create a simple example and send it to you.

By: Ken at DTSPosted on: Nov 16 2019 at 08:42:00 AM
A new feature that compares two consolidated parts lists, as described by Stephen, would be extremely useful. One additional feature I would like to see would optionally highlight differences between the reference designators of each row of the two BOMs as well as the item quantities. But simply the "match items and compare quantities" feature as described by Stephen would be frequently used.

By: JasonPosted on: Nov 17 2019 at 05:16:03 AM
I would consider the BOMs to be different if the same items appeared in different arrangement (ie in different levels) or even if the ref-des had a slight difference (ie a resistor appearing in R23 rather than R33 is, in my mind a difference that should be highlighted)

Comparing consolidated lists might work for some but I would want to be able to compare multilevel Assemblies to spot slight differences in layout

By: FlemmingPosted on: Feb 20 2020 at 11:15:05 AM
Negative quantities would also be required working with secondary yields like I described in another question. Product D consist of B+C+A where A is reproduced after the process but can not be in shortage before the process.

By: GuestPosted on: Feb 21 2020 at 05:45:40 AM
In other posts there's mention of 'By-Product'. Is your 'A" that by product? It has a part number. A quantity of it is required but it doesn't physically exist as a stored item in your inventory?

Minimrp has a part type MISC. That has a part number. It can even have a value. A BOM can contain a quantity of it. But when you process the build the quantity is not taken out of your inventory. As somebody else said in another thread it just appears out of thin air.

By: JFS-BarcelonaPosted on: Apr 3 2020 at 05:52:36 AM
Hi, I'm a beginner and I don't speak English. A question that means Reference or (Ref / Pos) in an Assembly when I load a cvs from a Solidwors Assembly. Thanks

By: SupportPosted on: Apr 4 2020 at 04:01:45 PM
Ref/Pos. This is a plain text field. It can contain anything you want.

Usually it is used to describe how or where the component is attached to the assembly.

But you can leave it empty if you want.

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