From: Brooks Bill
Sent: Tuesday, June 27, 2000 4:15 PM
To: [log in to unmask]
Subject: RE: [TN] Auto-insertion lead-to-hole ratios...


I remember those sort of limits being put on hole sizes due to the accuracy
of the positional tolerances of the machine, but more you had to have
certain lead clearances based on the body type of component to clear the
placement head and the 'cut and clinch' lead former heads on the bottom side
of the board. Also, the tooling fixture to pin the board down in the machine
would limit the edge clearances and require you to put the parts more
inboard than you can with SMT. I seem to remember something like .200 in.
clear all around the board? ... anyway it's all in the specs..
- Bill Brooks


-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Tuesday, June 27, 2000 4:08 PM
To: [log in to unmask]; [log in to unmask]
Subject: Re: [TN] Auto-insertion lead-to-hole ratios...


In a message dated 06/27/2000 6:00:12 PM Central Daylight Time,
[log in to unmask] writes:

> Hi Steve, I believe Universal published a guide for axial and radial
>  insertion using their machines back in the 1970's and 80's... I had to
use
>  it to do my boards from back then... Do you have access to that
>  documentation?  If not, I will look for it in my archives at home...
>  - Bill Brooks
>
>
>  Bill Brooks
>  Senior PCB Designer - [log in to unmask] <mailto:[log in to unmask]>
>
>  Zoneworx, Inc.
>  40925 County Center Drive, STE 200
>  Temecula, CA 92591
>  http://www.zoneworx.com    <http://www.zoneworx.com>
>  Tel: (909) 296-1226 x 1037
>  Co-Director / Education Officer / Webmaster
>  for the San Diego Chapter of the IPC Designers Council
>  http://www.ipc.org/SanDiego/index.html
>  <http://www.ipc.org/SanDiego/index.html>

Hi Bill!

Yeah, I got that...it's on their web page in an Adobe Acrobat file. They say

you should have a .019" +/- .003" larger hole than the lead diameter. What I

was trying to learn is if anybody has tried to push those limits and what
success they've had. Just so I can put to rest the notion of trying to run
this board on the VCD...

Thanks!

-Steve Gregory-

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