rev- or new part number
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Re: rev- or new part number
Re: rev- or new part number -- rj	Post Reply	Top of thread	Forum

Posted by: kenny ® 08/17/2006, 07:40:47 Author Profile eMail author Edit

I was told two things that usually make sense: 1) If the parts are fully interchangeable then a revision is acceptable 2) Numbers are cheap! (i.e. if any doubt exists on interchangeability, then just take out a new number) Kenny Kenny B

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Re: rev- or new part number
Re: rev- or new part number -- rj	Post Reply	Top of thread	Forum

Posted by: toyotaboy ® 08/17/2006, 06:29:35 Author Profile eMail author Edit

i've always been told, if you stick both parts in a bin and shake them up, can you tell the difference? If not, and they are different, it needs a new part number. Modified by Administrator at Fri, Sep 08, 2006, 19:51:41

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Re: rev- or new part number
Re: rev- or new part number -- rj	Post Reply	Top of thread	Forum

Posted by: Kelly Bramble ® 08/15/2006, 12:08:30 Author Profile eMail author Edit

Ultimately, this depends on your company policy's, and how different the part is. If a part is only very slightly different, used on a different assembly, then you may be able to add a dash number with the appropriate details and rev. the existing drawing. In general, depending on your application and industry, you do not want to rev an existing design for use on a new assembly. Someone may require the old part again for some reason. Also, you never want to create a new part number on a part that is used within the same assembly because it is only slightly different. The impact on your parts list, next assemblies, ect. may be complicated and require many more ECN's (ECO's, CN's) or what ever you use. Not to mention the confusion within manufacturing. If the part is significantly different, used on a new program / assembly, it is often easier to "save as" and create a new document. In this case, it may be helpfull to include a "similar to part number" for manufacturing. Modified by Kelly Bramble at Tue, Aug 15, 2006, 12:09:24

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Re: rev- or new part number
Re: rev- or new part number -- rj	Post Reply	Top of thread	Forum

Posted by: Guttdogg ® 08/15/2006, 11:27:33 Author Profile eMail author Edit

Depends on if you're going to use the old rev again.

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Re: Re: rev- or new part number
Re: Re: rev- or new part number -- Guttdogg	Post Reply	Top of thread	Forum

Posted by: cden ® 08/18/2006, 15:14:21 Author Profile eMail author Edit

FFF - If it meets the same form, fit and function of original part, you can revise the part, otherwise create a new part number. Essentially, can you go into production or the field and replace an existing part with the new changed part without problem (form & fit) and will it meet the same performance requirements as the original such as, but not limited to, mass/cg, structural capability, corrosion resistance, compatibility with other materials, etc. Other items to consider are costs. If the new changes significantly increase cost of the part, you should consider if you wish to apply that cost increase to all areas where the old part will continue to be used. Creating a new part number could be as simple as adding a new dash number to an existing "root" part number, or you may require a completely new drawing depending upon you doc control system.

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