Based upon my experiences, I've written up some notes for both vendors (job shops) and RFQ writers. Please see:

http://jeffalbro.net/cnc/rfqs/

http://jeffalbro.net/cnc/vendors/

I'd love to hear comments and suggestions.

Thanks!

-Jeff

Thanks for helping this site out with these tips.

Very helpful

Here is some more tips

http://www.jeffalbro.net/cnc/2d-comparison/

These look really helpful!

I would point out that dial calipers should not be considered acurate closer than .005" and that a good tenths indicating Mic is accurate to within .0001". Of course that depends on the skill of the user...

Thanks Jeff, I found your suggestions helpful.