
When you come right down to it, firmer chisels are pretty darn simple tools; however, for a chisel to work very well, several criteria must be satisfied simultaneously in one tool:
(1) the thickness should not be an impediment to work;
(2) the back should be as flat as possible, preferably fine-ground or polished;
(3) the metal should be hard enough to hold an edge, but not so hard as to make the tool hard to sharpen;
(4) the blade and the handle should be integrally bound together;
(5) the center of the handle should coincide with the center of the cutting edge;
(6) the handle should be tough and durable and faithfully transmit force to the cutting edge.
(7) the tool should balance toward the top of the useable end of the handle.
I recently purchased the Diefenbacher chisel set directly from Diefenbacher.I have used a set of Marples chisels of the pre-Irwin era for years, and it is useful to compare them with the Diefenbachers.The Marples have a hard rubber handle with a metal striking cap, and look very much like a black-and-blue version of the Pro-Touch chisels currently available on Amazon.
(1) At equivalent width, the Diefenbachers are as thick as the Marples through the blade, but thinner along the bevel edges.This improves control in tight work, e.g., dovetails.
(2) The backs of the Marples chisels were all slightly convex, and it took a lot of work to get them flat.A couple still have rounded surfaces away from the cutting edges.All six of the Diefenbachers are dead flat out of the box, but require some polishing to obtain a smooth surface.
(3) The Marples chisels are allegedly RC 58, but I have read that 54-58 is more accurate.The Diefenbachers claim to be RC59, and either this is an overwhelming improvement in edge retention or the Marples chisels are a lot softer.
(4) Both chisels have thick tangs that (apparently) run the length of the handles.The Diefenbachers have some sort of retention cap around the tang that presumably serves to keep the wood handle from splitting.
(5) The Diefenbacher cutting edges are colinear with the center line of the handle, and the back is at a slight angle to the center line of the handle.This means the whole chisel must be at a slight angle to cut straight up and down (not good) but puts the cutting edge along the putative line of force when you strike the chisel.The Marples backs are parallel to the center line, putting the cutting edge off-center.This makes it fairly simple to align the tool for a straight cut, but can effectively transmit force at an angle.I find that without care, I often cut inside a line with the Marples chisels, but do not with the Diefenbacher.
(6) The Marples chisel handles are incredibly tough--the blade would surely deform before the handle.The wood handles of the Diefenbacher tools are asthetically much nicer, and are made of a very tough hardwood.The striking surface is wood as well (though darker, so perhaps a different species), and the centerline is yet another piece of wood, in this case a plug.I would think twice before using a metal or heavy wood mallet on one of these.More expensive wood handled chisels come with some sort of cap to sidestep this problem.It is a shame that the Diefenbachers do not.
(7) This is a personal criterion arising from experience with several types of chisels.The balance point for the Marples chisels is well back into the handle, particularly for the narrowest blades.As a result, it can be a challenge to hold the handle the way it seems to be designed and accurately place the cutting edge.This seems like a picky point until you have to cut 20 dovetails in a single session: about the 10th time you have to use two hands to position the blade, you will be ready to pack it in.The Diefenbacher chisels are all balanced very close to the bottom of the tang, the place you are most likely to hold it during positioning and work.This must be due in part to a shorter shaft within the wood handle, because the Diefenbachers are all somewhat lighter than the corresponding Marples.In any case, in my biased world this makes for much improved control.
With this in mind, and with the choices available on Amazon, here is my summary:
For about $10 more than a set of Irwin/Marples blue chips (missing the striking surface of the Pro-touch), and for about $5 less than a set of six Marples Pro Touch chisels, you will get superior tools in every regard but the striking surface of the handles.If you do woodworking as a hobby, and use your chisels no more than a few hours a week on average, you will not find a better value than the Diefenbacher set.If you are concerned about the all-wood handles, you could instead purchase Two Cherries, Hirsch, Sorby, etc., premium brands.You will get similar or slightly higher hardness, uncompromising quality, excellent handle designs, and astronomic prices.I'd rather buy a second set of Diefenbachers if and when the current set wears out--I'll spend no more, and perhaps by then the handles will have an upgrade.
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6 Pc Firmer Chisel SetProduct Description: Firmer Chisels can be worked by hand or with a mallet. The chisels have a 3" long high-carbon steel blade (bevel edge) with a stout "tang" firmly embedded in a handsome hardwood handle. These tools are fitted with a beautifully lacquered 6" harwood handle finished with a leather cap to withstand mallet impact. We brand these tools with our Diefenbacher label. Made for us in the USA by Buck Bros.
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