Customer Reviews
Seem to work . . just OK. 
2008-08-12
Is it me, or what? Once I router cut a door-hinge mortise using a Porter-Cable hinge mortise jig, I can't seem to get the Porter-Cable corner chisel far enough back in the corner of the router cut to get the edges lined-up. After I use the corner chisel, I still need to a wood chisel to take out a little more in order to make a perfect corner. It almost looks like I need to do a little grinding work on the corner chisel with the bench grinder to make it align properly.
cornerchisselreview 
2008-06-29
You won't be disappointed. It is well designed, does not require instructions, and has few moving parts to break. Mine is still working after 2+ years. I haven't even had to sharpen it-yet. You won't find it at Harbor Freight. It is worth it. Just buy the dumb thing! Tom
What you see is what you get - it actually works! 2008-02-06
I picked this chisel up because I have watched Norm Abram of 'The New Yankee Workshop' use one for years and it just looked too good to be true. It seemed so much faster and easier than using a regular chisel to clean up the corners after running a router in a jig, but in this case what you see is exactly what you get.
I have used this to install some hinges on a door as well as cleaning up the corners of some recessed jamb switches and it works just as I would expect. I can't speak for some others who claim they received one with a dull cutting edge, but in my case the edge was sharp enough to easily cut a person if they aren't careful.
This corner chisel isn't fancy by any means, but it does what is was designed to do, and it does it well. One simple hit from the hammer and the corner is cleaned up with a straight sharp corner and in rare occasions it may be necessary to lift up the chip with a straight chisel, but the hard part, and the crisp corner, is done.
One note to new users, depending upon the density of the wood and the depth of the cut they are looking for it might take a few tries to get a feel for how hard you need to strike this with a hammer.
The only negative I can see is that this is fairly small, so if you drop it into a tool pouch you might have to go digging for it later. Since this isn't a tool I use often, I have retained the factory packaging and just put it back into the plastic package after each use to keep it clean and make it easier to find.
Corner Chisel 2007-09-22
This corner chisel worked very well. I use it for many things but the main reason for the corner chisel is I convert old wood window screens into windows by routing a rabbit for the new glass to go into but I need to square the corners. That is were the corner chisel comes in, it just takes seconds.
It works ok... 
2007-05-10
This product works ok. You still need to check and clean up with a chisle to make your corners sharp.
GREAT LITTLE TOOL 2007-04-10
Porter Cable 42234 This corner chisel is used for squaring corners to accept lock face. Just place this self-aligning chisel on corner and hit lightly with a hammer, and lift the chip out with a chisel, for a perfect 90 degree square corner. It will save
cornered 2007-01-07
This corner chisel has served me well since I bought it. It is high quality easy to use, and with care makes a nice clean corner cut. I don't know why I didn't have one of these before with all the uses I found for it.
Great! 2006-08-13
What more can one ask for? Works as promised. Makes 90 degree corners out of round ones!
If I lost, it I would buy the same one again 2006-06-28
I am a professional handyman and I find using a hand chisel to square the router made radius type corners to be a minor annoyance. Simply put; this tool does what it is designed to do and it does it well. I've only used it on a few doors but I think it is built to last and has a little more design to it that one would think at first glance or even after using it a couple of times. I actually found myself turning the thing up side down and looking at how it works; it's cool, it works, it's built to last and the price is right...buy it; I think you will like it.
It's almost too good to be true, but it is ! 2003-06-18
When I first looked at this I thought, "How can it know the exact corner?" But it does. When routing out a template guided area for example, leaving a rounded corner, you park this in the corner, one decent whack with the hammer, and to my surprise, a perfect corner. It is a very simple device. It's a 90 degree blade that slides along a very thin outer shell-guide.
No more chisel-chisel-chisel, and difficulty getting the exact angles. It works as advertised. Saves a lot of time, and does a superb job. Highly recommended.
