Pneumatic Chamfering Machine Mini Carpenter Chamfering Tool Portable Handheld Grind Chamfer Tool Deburring Trimming Machine (Black + 6pcs C-Blades for Metal Beveling

This pneumatic chamfering machine is a compact and lightweight tool that offers adjustable speed and chamfer size. It appears well-made and easy to use. I have only used it sparingly to test the functionality of the tool, but unfortunately I don't have a need to use it very often at all and can't say much in regards to longevity or extended use scenarios. For what I've done with it so far, it seems to be a good tool. I'd stay in the realm of DIY.

This hand chamfering tool comes with everything you need, including two types of air inlets. Everything that is, except instructions. There *is* an exploded drawing showing all the parts and how the tool is assembled, but no explanations.There are six inserts included, and the cutter uses two at a time. None were installed in the tool as received, so you'll have to remove the head (see below) and install them before use.There are styles of quick-change air inlet included, so they are not installed either. Even with teflon tape there would be no hope of sealing these. There was a single o-ring included in the kit, so I guessed that it was the seal and installed it on my inlet - that worked. The inlet has a thread relief at its base, so I'm comfortable believing this is how it's supposed to go together. The inlets are not part of the exploded view included.There are two "rings" if you will that you need to negotiate. One is the base, the part that is pressed against the part to be chamfered. The other is the graduated dial to indicate how much adjustment you're making to the size of the chamfer. Both have set screws. IIRC, the dial only has one, but the base has two. To install the inserts (cutters) you need to loosen (but do not need to remove) the two screws securing the base. It can then be unscrewed. The graduated ring will come off with it. The cutter holder is then exposed and you can install two inserts using the tiny torx screws provided. The operation is a bit fiddly with everything being so small and there's no spindle lock, so you need to hold the cutter holder while securing the inserts.Re-attach the "base" and it's ready to go. When adjusting, mine hangs up slightly as the graduated ring passes over part of the spindle. At first it seemed like I was out of adjustment range, but it just took slightly more turning pressure to and then it continued spinning easily.The screw on the graduated dial can be loosed and the dial spun to set "zero". Even without zeroing, the dial can be used to determine how much more or less you're changing the chamfer.It's worth noting that this tool needs at least 1/2" or so of space on the edge where the bearing runs, and quite a bit more on the edge the base engages, so there are some areas you just can't reach.Some chatter marks seem inevitable with a tool like this, but I found that running the cutter back and forth a few times really helped. Changing the speed didn't make much of a difference.In the photo you can see a piece of steel (top) which I chamfered somewhat heavily, and below it, a piece of aluminum. The aluminum was chamfered at two settings - fairly deep to the left of the corner of the piece of steel, and only to break the edge to the right of said corner. This is an extreme close up, but all chamfers look pretty good to the eye.I can't consider this a precision chamfer tool, but you can get good chamfers out of it, and it will chamfer edges that would be difficult to do on a manual machine. And it's quick and convenient!Other than the lack of instructions, I think this tool is about as good an example of its type as you're likely to find.