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Brad Albing

Rolling Your Own

Brad Albing
Brad Albing
Brad Albing
7/6/2013 1:19:22 PM
User Rank
Blogger
Re: custom tools
@Derek - I've done that same trick for your #3 for screw-eye installation.

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Brad Albing
Brad Albing
7/6/2013 1:17:28 PM
User Rank
Blogger
Re: Preamp for guitar
@DaeJ - Guitar preamps are pretty easy to design  - there are lots of schematics published showing many ways to do what you need. Let us know what you end up with.

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antedeluvian2
antedeluvian2
7/4/2013 12:18:02 PM
User Rank
Newbie
Re: custom tools
RedDerek

There are screwdrivers that will hold the screw on and up here in Canada we have the robertson screw that is designed so that it won't fall off. There was a discussion recently that covered this topic (screwdrivers) and other tools on the Connecting Edge. Rather than re-hash the topic here is one blog and here is the other.

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RedDerek
RedDerek
7/4/2013 12:10:10 PM
User Rank
Master
Re: custom tools
I actually have a jeweler's screwdriver and the barrel is long. The original intent of the tool was to reach down into an old box of electronics (I was doing repair), and unscrew some connectors that had a similar shape for the screw. The regular screwdriver kept falling off. The tool is all metal and will not wear out easily. I can post a picture, but the Bourns is the concept - did not know that was around many years ago. Besides, with a machine shop at your call it sometimes is faster to ask someone to whip one up in 30 minutes or less.

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antedeluvian2
antedeluvian2
7/4/2013 9:49:01 AM
User Rank
Newbie
Re: custom tools
RedDerek

2. Adjusting the small trim pots with a flat screw driver is difficult as the screwdriver tends to slip off frequently. I had one jewlers screwdriver modified to have a small barrell added to it. The barrell fits over the screw and thus keeps the screwdriver tip in the slot.

These are commercially available. Take a look at this page, bottom right hand corner.

I also have one from Bourns. Look at the H-90 on page 165 of their catalog.

The problem with both is that one side has an exposed blade and I find it cuts into the skin if you have a number of adjustments to make.

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Vishal Prajapati
Vishal Prajapati
7/4/2013 5:19:13 AM
User Rank
Master
Re: custom tools
Derek I like the screw driver with berrel idea. It is nice to have tools custom built for our own use with samllest change in it. I generally use plastic boxes that generally come with the packaging of sample ICs to hold the resistors of different values.

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RedDerek
RedDerek
7/3/2013 12:10:17 PM
User Rank
Master
custom tools
The company I do much work for now is a machine shop with 3-d mills, lathes, water jet, etc. Quite nice to have access to. Some of things I have had built...

1. Took that chunk of granite that was cut out for the cook-top was water jetted into smaller pieces that are assembled as a puzzle. Lighter segements for small trivets on the table. Or assemble up as a jigsaw puzzle for a larger one.

2. Adjusting the small trim pots with a flat screw driver is difficult as the screwdriver tends to slip off frequently. I had one jewlers screwdriver modified to have a small barrell added to it. The barrell fits over the screw and thus keeps the screwdriver tip in the slot.

3. I had many screw hooks to put in the eves around the house to hold Christmas lights - easy to put up and pull down. I had a custom tool made that I can fit into a battery powered drill. Clip in the hook, let the drill do all the work. Cut the time down to installing a hook from a minute to seconds.

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Brad Albing
Brad Albing
7/2/2013 11:44:09 PM
User Rank
Blogger
Re: Extra hands
Not bad - especially for working with coax which is typically prone to melting and shorting when being soldered.

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eafpres1
eafpres1
7/2/2013 12:23:28 PM
User Rank
Blogger
Extra hands
Most of the fixtures I've used for soldering small stuff involved some kind of base with adjustable position and some small clamps, especially alligator clips used as small spring loaded grippers.  Here is a photo of the general class of thing I've used and seen:

Handy Work Station

Back in my production days, we had an RF assembly that was part of an active antenna module for cars (i.e., it was one of those black fin modules you see on cars everywhere now).  The circuit board was assembled mainly by SMT, but typically there were two ceramically loaded patch antennas added whose feed pin had to be hand soldered, and 2 or 3 coaxial cables that had to be hand soldered.  These were all issues in production.

For the coaxial cables, we had aluminum fixtures where the board was inserted, then a hinged cover came down with a slot to align the cable and an opening where soldering was to occur.  There was some kind of spring clamp that held the cable once the operator placed it.  Cables arrived to the station pre-tinned.

This whole setup made it easier for the operators to solder well without damaging other areas.  Once fixtured, they would insert the tip of the (digitally controlled) soldering iron, then feed wire solder to get a fillet, then remove the iron.  Worked pretty well; one factory I was involved in did about 10M coax to PCB solder joints a year this way and the total end of line reject rate was < 10 ppm.

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DaeJ
DaeJ
7/2/2013 10:02:26 AM
User Rank
Master
Preamp for guitar
Some guitar circuitry is very much impressive as circuit is working properly without any short circuit.  Recently, we bought two guitars for my son and daughter. I might consider the design of preamp for their guitars as using old fashion of PCB design. I hope that my family has no complain for my design. But, it will be exciting for engineering education.

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