Most modern cabinet saws lack rigidity and have been value engineered down to a price. A compromise is struck between performance and cost. The heavier the saw in general the better the quality of the cut. Mass damps down vibration which results in a better quality of cut. However, heavy saws are difficult to move around in a small shop. So lightweight is often seen as an advantage. A paradox! To reduce weight the trunions are often scaled back. Instead of big beefy castings they can be pressed steel or very light weight. Equally the thickness of the cast iron top can be scaled back, often with the result that unless flawlessly stress relieved before machining will move and bend.
The accuracy of the main fence is paramount. All too often modern saws have very light weight fences that don’t lock properly / hold their longitudinal accuracy compared to the blade.
Under powered motors, smaller motors are lighter.
New:
For the money I don’t think you can beat a Sedgwick TA315. Good saw, very capable, made to last and be very accurate. The only thing I don’t like about them is that they are not easy to service.......which you would need to do extremely rarely.
Secondhand
Sedgwick TA315, LK
Wadkin BGS12
Startrite DS275.
A few photos help to show the build quality of these saws. Sorry I can’t find any any of the TA315......if I find them I will add them.
trunnions of a Startrite 275
this is the lightest trunnion assembly. However, all cast iron, and very stiff. The rise and fall / angle are on standard screws rather than either Acme thread or better still worm drive. The single trunion can be adjusted for any wear.
Startrite DS275
Wadkin Trunnion
all cast iron construction. Worm drives in rise and fall and angle adjustment. Double trunnions, no adjustment, but I’ve yet to find one worn to cause problems. The rise and fall has a grib that can be adjusted to reduced any lateral play due to wear.
Wadkin BGS
all cast iron sliding table Assembly.
Sedgwick LK Trunion
this is the second generation LK, the first is slightly different, but no less robust. Very heavily built, big bearings, easy adjustment of the belts. It’s all pinned for accuracy. height adjustment on a standard screw thread.
sedgwick LK