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Neoprene Specs, Dimensioning & Tolerancing
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Posted by: technobia ®

08/21/2005, 21:23:14

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Hello -

I am new to this site and hope I am posting in the correct place. I have a electro-mechanical drafting and design background in a manufacturing environment but have not worked in the field for a number of years.

I have a client who is trying to design sporting apparel that is made from neoprene in different thicknesses.
I am trying to develop a set of manufacturing drawings and material & silkscreen specs and only have no idea what the standard approach should be.

Does anyone know of any standards or documentation guidelines or other resources that you could point me to for such kinds of product designs? I just obtained the ASME Y14.5M-1994 Dimensioning and Tolerancing standard and I am looking through it, but so far, I have not seen anything that directly relates the following items of concern:

1. Dimensioning and Tolerancing a pliable material.
2. How to dimension pattern pieces that have all kinds of complex curved lines
3. How items that are to be sewn or bonded should be articulated in an assembly drawing.
4. Defining silk screening with Plastisol

I would be grateful for some advice and suggestions.

Thanks -
Technobia







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Re: Neoprene Specs, Dimensioning & Tolerancing
Re: Neoprene Specs, Dimensioning & Tolerancing -- technobia Post Reply Top of thread Forum
Posted by: kelly_bramble ® Administrator

08/22/2005, 08:52:53

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For what you describing, I doubt ASME Y14.5M – 1994 is going to help you for several reasons. First, I would like to point out that I train to the ASME standard throughout the USA and Canada.

I doubt the manufacturers of the silk screens, or flat pattern fabricators are going to have any idea what the symbols used with GD&T are anyway, and I don’t think training these professionals is required to get a quality product. Most designers and plastics type manufacturers have moved away from toleranced drawings. Unless you have specific dimensional requirements, such as interface fits, detail dimensions with tolerances are not required. With plastics and other pliable materials, the manufacturing process tends to be more capable than the dimensional requirements of the product. This is because the product itself is “pliable”.

What you will likely be required to define is either a flat pattern, or contour drawing. In the PCB world there will be an artwork drawing and a production master type drawing, which may be derived from a CAD model.

I would first contact a couple or more candidate manufacturers and ask what they require is the form of documentation or CAD data.







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Re: Neoprene Specs, Dimensioning & Tolerancing
Re: Re: Neoprene Specs, Dimensioning & Tolerancing -- kelly_bramble Post Reply Top of thread Forum
Posted by: Technobia ®

08/24/2005, 09:26:24

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Thanks for the reply - what you say about dimensioning & tolerancing makes scense however how would you inspect such an item without some kind of dimensional refrences?

However, I would imagine there would still have to be some kind of assembly reference on the pattern pieces to locate them for assembly. This product is something someone designed from an existing product as a base that is being reverse engineered with modifications added into the design. I just want to make sure I articulate all that is required to get this thing documented for a quote and selecting a fab house.

Doing the silkscreen like a PCB makes perfect sense and I have done that kind of work before. I would imagine that I just place the alignment targets somewhere outside the boundaries of the pattern.







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