Newsgroups: comp.robotics
Path: brunix!cat.cis.Brown.EDU!agate!howland.reston.ans.net!gatech!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!fs1.ee.ubc.ca!niallp
From: niallp@ee.ubc.ca (niall parker)
Subject: Re: STEPPER DRIVER INFO NEEDE
Message-ID: <1994Aug11.011112.22617@ee.ubc.ca>
Keywords: old parts, salvage
Sender: news@ee.ubc.ca (Usenet News)
Organization: University of BC, Electrical Engineering
References: <328nsb$h6c@handler.Eng.Sun.COM> <32aurf$7sm@lastactionhero.rs.itd.umich.edu>
Date: Thu, 11 Aug 1994 01:11:12 GMT
Lines: 36

In article <32aurf$7sm@lastactionhero.rs.itd.umich.edu>,
> 
> ...
>
>  I guess my main motive is to point to the thing and say "look what  I 
>built out of trash!".  The truth is, I cant figure out a practical way to 
>desolder glue logic, so I've already invested more in 74LS gates, 
>connectors and perfboard thatn the resurrected z80 chipset costs retail.
>I tried solder wick, solder sucker, oil bath and pliers, ans saws.
>It was the principle of resurrecting a "frankenputer" from discarded 
>logic . .
>
>I am using leds, ribbon cable, switches, ram and rom and complete 
>z80 chipset pulled out of trash.
>Yes, I'm utterly mad . .  just thought you might like to know . . .

A technique I used with quite a bit of success is a blow torch or
industrial hot air gun and a pair of needle nose pliers. Just stick
the board in a vise, grab each chip in turn and heat it till it 
comes out. The board can start smoking if you're not careful, but
usually it isn't that important (just get some reasonable ventilation).

The chips may need a little clean up (sometimes traces come up with
them) but they are usually OK.

Other method a friend said worked well was to heat the whole board
on a stove till the solder flowed, then quickly shaking out the 
parts.

					... Niall


-- 
-------
Niall Parker				niallp@ee.ubc.ca
UBC Electrical Engineering	    or	VE7HEX@VE7UBC.#VANC.BC.CAN.NOAM
