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Old 04-25-08, 11:23 AM   #1
reich17
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For The Math Wizards And Other Intellectuals

I am attempting to come up with a formula, that produces a number, that in some way, comes close to accurately reflecting the difficulty of assembling a product. I realize that the per piece value is misleading because a higher value does not necessarily mean a higher degree of difficulty to assemble but could represent a product that requires more (or more costly) material than labor. Anyway, based on square footage of material required per product, per product cost and number of the product for the order I wonder if there is a method of determining difficulty for reasons of scheduling production time.
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Old 04-25-08, 11:43 AM   #2
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If I read you correctly, it sounds like you're talking about a classical job shop scheduling problem. Google this- there's plenty of pointers out on how how to handle this computationally.
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Old 04-25-08, 06:29 PM   #3
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What kinds of products are we talking about here?

Regardless, I'm thinking you can quantify the difficulty of the steps in the assembly process, rather than the materials. For example, a bookshelf that requires 20 screws to attach 5 horizontal pieces to 2 vertical ones and 16 screws to attach the backing would be harder than a night stand that requires 8 screws to attach 2 horizontal pieces to 2 vertical pieces and no backing.
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Old 04-25-08, 07:02 PM   #4
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Making a Jig or assembly container will allow multiple subassemblies to be fastened. You really have to have an idea of how many assemblies you wish to produce at a sitting and then optimize your process for that. If it is a low volume (50 or less assemblies), the savings will be minimal in creating staging and assembly aids. However, if the qty grows and you have either just yourself or one other person doing this, it could be beneficial.

In either case, the above fastener/unit labor approach will yield the most accurate estimate, as long as it is averaged over multiple assemblies.
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Old 04-26-08, 07:10 PM   #5
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Quote:
Originally Posted by reich17 View Post
I am attempting to come up with a formula, that produces a number, that in some way, comes close to accurately reflecting the difficulty of assembling a product. I realize that the per piece value is misleading because a higher value does not necessarily mean a higher degree of difficulty to assemble but could represent a product that requires more (or more costly) material than labor. Anyway, based on square footage of material required per product, per product cost and number of the product for the order I wonder if there is a method of determining difficulty for reasons of scheduling production time.
Use a weighted average.
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Old 04-26-08, 07:16 PM   #6
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Use a weighted average.
That can lead to bad results when you are already at or near capacity, and would need to expand in order to take on the increased production.
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Old 04-26-08, 10:13 PM   #7
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