[SI-LIST] Re: question about connectors and PCB manufacturers

Anand,

PCB manufactures usually have a standard drill and pad/route tolerances.  I
have seen a specification of +/- 0.005" for pad/route placement and similar
numbers for hole location.  Tighter tolerances cost money and it is hard to
imagine that there is not enough slop for the connectors to bolt together
using the default tolerances.  A more critical item may be the placement at
the assembly vendor.

Charlie Anderson
PPT Vision, Inc.
(952) 996-9500


-----Original Message-----
From: Anand Kulkarni [mailto:anand287@xxxxxxxxx]
Sent: Thursday, December 19, 2002 10:16 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] question about connectors and PCB manufacturers



Hi everybody,
I have a question about the capability of PCB manufacturers.

I have a surface mount SCSI connector with 68 pads .

050 inch x .100 inch Center - SCSI 3 Compatible - Shrouded Straight -
Surface Mount Socket 

example : 2 identical connectors :
_________________________________________
|       _________________________        |
| o    /                         \    o  | 
|      ---------------------------       |
-----------------------------------------
Connector 1

_________________________________________
|       _________________________        |
| o    /                         \    o  | 
|      ---------------------------       |
-----------------------------------------

Connector 2


Now this connector has got 2 holes , 1 on each end , apparently for screwing
to the board.

Now, I want to place these connectors on opposite sides of the board.
i.e, one connector on the top surface and the other connector on the bottom
surface ;
and I want them be perfectly aligned to each other , as seen in the top
view.

further ,I want to  screw them "TOGETHER" through the board.
i.e, nuts on both the top and bottom surface and the thread passing through
the vertically 
aligned holes. Again the holes have to be perfectly aligned.

Also , the pads have to be prefectly aligned.

Is this "alignment" something that I can expect the PCB manufacturer to
easily achieve ?

Please do reply with your suggestions,

thanks very much,

regards

Anand Kulkarni



------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu
  
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: