Homebrew PCBs

On Thu, 22 Sep 2005 10:34:23 +0200, turbojet <turbojet@...>  
wrote:

> You are reffering to a completely different type of equipment!
> There are a clampingbar at the shear that ST showed....


Maybe we can clarify the definitions.
Let's use some photos:

<http://www-me.mit.edu/Lectures/MachineTools/sheet/shear.gif>
This is what you apparently call just "shear". This is the type that often  
comes combined with a bending brake and or roller. It can be powered by  
hand, foot, air, electricity, ...

<http://www.fablamp.com/cmf-mid.jpg>
This is what you apparently call a lever shear (note that a lever shear  
(Hebelschere) in German is the next thing, not this one). It's natural  
habitat is apparenly the middle of the desert ;-)


<http://vansantent.com/images/slittingshear.gif>
This is apparently called a slitting shear, not a lever shear. This is  
what i meant.


<http://www.geodetic.com.au/images/hawml08296.jpg>
http://www.bloomertool.com/sitebuilder/images/Picture_024-250x168.jpg
These are tinsnips i think.
You'd want left cutting offset snips for PCBs if you are right handed, if  
i have decoded your nomenclature correctly (second photo). Offset because  
it doesn't require so much bending of the material and left handed so you  
can hold the shear in your right hand, and cut along the right edge whith  
the board outline visible. If you have a right handed shear (like i do)  
you either don't see the line or you must hold your arms at impossible  
angles and cut towards you.


<http://www.samstagsales.com/Gedore/gd426026t.jpg>
<http://www.bloomertool.com/sitebuilder/images/Picture_058-250x168.jpg>
This is a nibbler, a very useful too too! For cutting out indents etc..
Take note that there are closed and open nibblers, the open ones do not  
cut off the metal strip at the front, and are not really much use. The  
first image shows closed ones.

<http://www.us.trumpf-powertools.com/32.img-cust/N700-2_bluegrey2.jpg>
There's motorised nibblers too, but take care there are large differences  
in construction and application.


If you know additional names for one of the mentioned shears, or know  
another type (like what is the type with cutting wheel called??), please  
let me know.

ST