OK... Few things here...
BB, you keep mentioning that commonly available Japanese saws aren't suitable for "hardwoods in this country". As far as I know UK timber isn't much different than what we have on my side of the pond, so what is the issue?
Looking at LV's saw offerings (of which many if not all, are sold in the UK by various retailers), I haven't seen a mention that a given saw is to be used only in softwoods, actually it is mentioned for many of these saws that they work with both softwoods and hardwoods. And my experience (I've had four of their Japanese saws) supports that. You might want to put this down to "retailer's hype", but I know LV enough to tell you that it's not the case. So I'm asking again, why are these saws unsuitable for hardwoods? The very high end Japanese saws, those that are hand-made and must be sent back for re-sharpening, are filed specifically for the type of wood used, but the mainstream saws are not.
Philipp, you raise one good point, Japanese saws are ready to use right out of the box. Western saw manufacturers are not, except for the high-end ones. Actually, not to put down the high-end makers, the quality of the sharpening is often what distinguishes their saws from more mundane ones (neglecting beauty and material quality for the moment). More on that later. As far as "unflat" cuts go, Rob Cosman told me something similar when I mentioned to him that I preferred my rip dozuki by far compared to the LN DT saw he had sold me. In practice this hasn't been an issue, even in thick stock (I made tests). One thing to remember about Japanese saws, one can't correct a cut once started, the blade is too thin.
Sparky, you said that you tried a dozuki for dovetails and were disappointed. Did you use a rip dozuki? It makes a world of difference... FWW did a review of dozukis a year or two ago, and the crosscut dozuki saws took up to five times more strokes to do the same endgrain cut as the rip dozukis. If you didn't use the proper saw no wonder you were disappointed.
A few months ago, one of our local association members purchased a DT saw made by Ed Paik, an up-and-coming Canadian saw maker, and wanted our (the other association members') opinion. It did well, somewhat better than the LN another member brought for comparison. Another member brought a Pax, and was quickly convinced to return it because it performed so poorly (I think sharpening was an issue here). But the best cutting saw was a cheap gent's saw sharpened by Tom Law (of sharpening video fame). I didn't want to kill the party so I didn't bring my rip dozuki. Maybe I should have, because it would have blown all these western saws in a New York minute...
In the end, coming back to Scrit's intended plans, if we look at dovetail and carcass saws, here's the lowdown:
- Western saws are sturdy, and can be used by a ham-fisted gorilla without too many dire consequences. They can be resharpened by the user (if proficient, and willing to spend the time), and their blade thickness allows them to correct a cut without too much deflection.
- Japanese saws are the opposite. They are fragile, and demand more proficiency from the user (on top of getting used to the pull stroke, I ruined my first dozuki by not handling it properly, good thing it was an inexpensive one). One important point is to let the saw do the work, i.e. not force it into the cut. I think that's what leads to unflat cuts. They also can't be sharpened (except the very high end ones), which is not necessarily a problem. Western saws blades have been hardened traditionally to Rc 38-42 (LN claims 50-51 on their DT saw); Japanese saws are much harder, my rip dozuki is Rc 61, and my Z Saw is quoted at Rc 70 (which honestly I find hard to believe). The bottom line is that Japanese blades last much longer between sharpenings than western saws, at that point replacing the blade isn't more expensive than having a western saw done a few times, unless you don't value your time.
The reward for using Japanese saws is speed, precision, and smoothness. But they are used differently from western saws, in my view the learning curve is more than worth it.
DC