Dremel 9901 Tungsten Carbide Cutter

I needed to remove about 1/8-3/16 inch of steel from a 1 inch slot so a disk grinder would not work. The steel was about 3/16 inch thick. There were four slots to do in total. I also had never used a Dremel to remove steel. If you keep the speed no higher than medium and be patient, you will get the job done. If you try going to fast, the Dremel may overheat and you may get bouncing on the bit. The bits did the job. I bought two expecting to either break one or wear one out, but I never used the second bit. Did it with one bit. The job took just about 15-20 minutes. I would definitely recommend the bits.

Amazing Bit !!!

It definitely help me to get thru some work fast.

quality

I bought this cutter to make a square hole in a metal stud - the type of metal studs used to hold up drywall in high-rise apartments/offices. The cutter worked great, it moved through the metal stud no problem. I did however have 2 problems that I'm writing this review so that others can benefit from my experience:1.) The cutter is relatively short. I was trying to cut metal that was behind some drywall. So the cutter had to be long enough to get through the drywall and through the metal. Because of an obstruction on the wall surface, I had to hold the tool about 1.25" away from the metal. This made it so that only the very tip of the cutter would contact the metal. While it worked I can comment that the tool is very short, so consider you application before buying.2.) The cutter is very brittle. I actually cracked the shaft of this tool and could not complete my job. Because of my particular use, the cutter was bouncing around a bit in the slot I was cutting. This caused the bit to break. After it broke, i used the remaining portion to try to cut again. It broke a second time.Final recommendations: This cutter is good for controlled cuts in mild metals where you can brace/secure the work and the tool. This tool is not very good for free-hand cutting as I was doing. Make sure that you control the tool well to prevent bouncing and cracking of the bit. I think I will re-try with a thicker-shanked bit. Perhaps 3/8" if I can find one.

I was adding some new gear to the outside of my Jeep and ended up with two pieces of heavy gauge steel pieces from two different accessories that overlapped each other and didn't mate up properly on one side. Nothing huge, but enough that a couple of bolts weren't quite lining up where they needed to go. A few rounds of loosening and tightening the other bolts involved and trying some "percussive persuasion" didn't change the situation, so I decided to try extending the recalcitrant bolt slots a little bit. Tried a set of metal files I had without much luck - they were too fine and only removed an infinitesimal amount of metal each stroke - so I decided to see if Dremel had something that could speed things up. Not something I'd use to remove serious amounts of metal, at least not from the heavy-gauge stuff I was dealing with, but for extending the slots the extra 1/4 inch or so that they needed, the 9904 cutter got things done quickly and with good control. Hindsight being 20/20, if I had to do this over again I'd wear some light work gloves or even just latex ones since the metal comes off in a spray of small particles that took repeated washings to get off my hands afterwards. Ah well, live and learn.

Used it to trim intricate curves on sheet metal. Stayed sharp the whole time.

It can make some interesting designs with a little practice , I like it , experiment with the angal you approach the wood ( or what ever your carving ) and you'll discover different patterns you can make . Like all carving tools they can jump on you and you don't want that , so don't be shy with it because your grip on the Dremel will loosen as well ,( I dont know why that happens ) keep a good grip on the Dremel and you will have the best control over it , your boss , artist, crafter you can make something really nice with bits like these . 5 stars