The Hammer A3 41A jointer is the only jointer in the Hammer A3 jointers and planers series. It is essentially the same machine as the Hammer A3 41, but with the planing unit removed.
It can be combined with the Hammer A3 41D planer if you prefer to have two separate machines rather than a single combination machine. It is, however, about 40-50% more expensive to have the two machines than one Hammer A3 41.
In its base form it comes with a 3-knife, quick-change, self-adjusting cutter block. This can be upgrade to a so-called ‘Silent-Power’ cutter block, which has spiral cutters and is — as the name suggests — much quieter. In this video you can see the difference in sound it makes.
The Silent-Power block has spiral cutters, which is actually 62 small blades lined up in a spiral form. These blades have four sharp sides, meaning you can simply unscrew them, turn them around 90 degrees and use the next sharp edge. Another benefit of this is that when you nick the blade, you don’t have to resharpen the entire blade, just turn around one small one.