Re: which gauge? (long and a little theoretical)
Lyn J. Mangiameli
>There are basically two approaches to measurements and marking that correspond roughy to numeric and analog.
Numeric measurements are just what they sound like, one obtains or designates a number and then uses that number to layout (mark) the workpiece accordingly. So, I want a line 3/4" of an inch in from the edge.
The other approach takes the measurements directly from the another portion of the workpiece, and never bothers to convert that distance into a number. What you are usually doing is just transfering a distance. Story boards, bar guages and measuring sticks (see Bridge City Tools for the most expensive version, and Lee Valley for an inexpensive version of this simple device), and even Spider Dividers and pantographs are all devices that utilize this approach.
Traditionally, marking guages were used primarily as analog devices. You transfered a distance to your workpiece without numbers interceding. Yes, some would use a numbered rule from which to obtain the distance to be transfered, but basically you were never using your marking guage to determine a distance, it always came from somewhere else.
More recently, more marking guages have come with graduated sticks that allow you to the guage to a predetermined number, with no need for transfer. This is perceived as offering considerable precision and convenience (removing the transfer step), but the downside is that the woodpieces you are dealing with are rarely dimensioned to precise numeric dimesions, and it is easy to miscalculate or misread the dimesions desired. This is why storyboards and bar guages have long had such a following.
Bringing this back to your question on marking guages, what sort of marking guage you will prefer will largely depend on your prefered style of measurement, recognizing that one usually uses both approaches. I much prefer the analog story board/bar guage/unmarked marking guage approach. For me, it is faster, more precise, and far far less prone to error. Thus, though I have a half dozen marking guages ( including some very expensive ones), I almost invariably reach for my Veritas Standard Wheel guage. It does everything I ask for it to do and does so cheaply (which makes it easy to have two or three for keeping different measurements, rather than having to readjust one--with the added opportunity for error--when marking multiple distances). For transfering distances, I've never felt the need for microadjust as my exact adjustment was taken directly from the distance I'm trying to match.
For those who take more of a numeric approach to laying out distances, a marking guage with a graduated bar and microadjustment is nice. Here, if you decide you wish to increase a measurement by exactly 1/64, it can be easily achieved directly on the guage and directly with reference to the existing setting on the guage. I rarely work this way, so the guage I have that does this is equally rarely used.
Now a graduated, micro adjust guage can be used as an analog device, and a "plain jane" style of marking guage can be used numerically by transfering measurements from a rule, but one tends to gravitate to the one style or the other based on one's own primary approach to laying out dimensions.
Since I've gone on so long about analog vs numeric, I'll be overly brief on cutters/marking pins. The majority of the time, a round cutting wheel will be preferable. It is easier to sharpen, makes a finer line, works better across grain, has a cutting action which tears the grain less, and is unlikely to stab you. The traditional pin, when sharpened for a cutting action (there are lots of places that describe this), can sometimes be better for marking along the grain where it is less prone to follow the grain. It is also better for marking wider more visible lines.
Much more could be said about these rather simple but most useful devices. My recommendation is to start out with a basic Veritas Standard Wheel Guage, then later, if you desire more, obtain another that meets some need, if any, that you feel is not being met by the Veritas. It never hurts to have at least a couple marking guages.