Am I right in thinking the guard is missing?
If so £50
Hmm, if so not £50, scrap metal.
If the motor is in good order someone will no doubt have that for something
Hmm, maybe if they can be arsed, radial arms have by and large been replaced with more accurate safer kit.
But it's the so-called "portable" (lightweight) model which I believe were under £200 (street price) when new in the 1980s. My DW125 cost me about £250 back then (1981). As others have pointed-out, though, this one has no guard, so it's probably only fit for spares because DW just don't supply spares for them any more (the model didn't survive the transition from original DW, through Elu to yellow, current DW which probably makes it 30-odd years old)they are around £800 new so perhaps £200-250
The problem, though, is that with that particular model (the DW320) the saw was just too lightweight. The older hobby models (e.g. DW125, 1251, 1501, 1751, etc) are more suited, although DW stopped selling dado guards back in the 1970s which therefore restricted you to their 2-part 16mm wide trenching head in the standard saw guard. Good head, cuts well and far safer than a stacked saw set, but a tad restricted - and sadly long since discontinuedi must admit i had looked at buying one about ten years ago as the dado head sort off appealed as being ever flexible as well as trenching angle cuts and sheet material capacity
Guarding an RAS for a dado or trenching head tends to be a make-it-yourself thing, I reckon. On industrial machines there are appropriate guards available, as on this Maggi:but a dewalt 18v track saw a pull saw and decent collection off routers made a set up much lighter much more flexible and takes up far less space as well as far less danger in use as proper guarding in dado mode is nearly impossible without chain mail and gloves
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