×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Vendor creates additional drawings for approval - Standard?

Vendor creates additional drawings for approval - Standard?

Vendor creates additional drawings for approval - Standard?

(OP)
I have been working with an injection molding company in Taiwan for several years. They are not ISO so I am curious as to the reasoning for the additional drawings they create. We send them 3D models and drawings of injection molded parts as well as 2D drawings of overmolded cables. They recreate these drawings to include their part numbers and then send the drawings to me for approval before they continue with the PO. No additional dimensions are added, and tolerances are sometimes missing or exaggerated. There is not another vendor I work with who does this, but since I am still young in my career, I am curious if this is standard anywhere else. I have little control of who we do business with, otherwise I would love to work local and get this question answered the 1st time I asked them. This is time consuming and unnecessary in my opinion.

Thanks for any input!!

RE: Vendor creates additional drawings for approval - Standard?

Some vendors will do this - especially if they are using non standard processes or exotic materials...

Some of our precision ceramic vendors for instance do this.

Often it's translating the drawings to local 'standards', and possibly tweaking them to suit their process etc. Not sure this is the case here.

Do they actually ask for design/tolerance changes to suit their process or just make mistakes when recreating your drawings?

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: Vendor creates additional drawings for approval - Standard?

(OP)
On cables they would ask for tolerance changes at times. On the molded parts, material & tolerances are just missing from the block. Trailing zeros removed (metric). This company makes products extremely similar to the ones I send them, and it uses the same material.

I am less opposed to reviewing them knowing that other vendors also do this, but will continue to ask for a reason. Thanks!

RE: Vendor creates additional drawings for approval - Standard?

If you are using trailing zeros for tolerance specs on metric drawings, that violates ASME Y14.5.
They are removing them to give them more tolerance and be in complaince with the spec.

I think they want you to approve their retoleranced prints to give themselves an out if the parts meet their print but not yours.

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources