Amana Tool Spektra Coated Solid Carbide CNC Spiral Single O-Flute Router Bit, 51411-K, 1/8 D x 1/2 CH x 1/4 SHK x 2 Inch L Up-Cut with Mirror Finish

Great products at a competitive price

Since the pandemic, I've not been able to use my local makerspace which had a laser cutter. Laser cutting acrylic gets very smooth lines but I was also a little concerned at burning the plastic more than necessary. Combine those concerns, and cutting with a CNC at home was an obvious alternative. I thought $40 was very expensive for a cutting bit, but so far it's performed extremely well. After sanding it's possible to get smooth crystal clear edges.Also... on only the second or third use, I accidentally dropped the bit on the cement floor. I don't think the cutting side is what hit the floor, but in most cases, this would've broken a carbide bit. I picked it up and it looked totally fine! I can't say for sure if i'm endorsing for amana's rainbow tool hardening, but if I am, it sure worked.

I was an idiot. I made one test cut with it, and was so blown away by the quality of the cut, I completely lost my mind -- because I forgot to lower the router before moving the fence and the fence broke the bit off. Nothing was spinning, I was just a moron and was distracted by the quality of the results (which was a perfect satin finish on 1/4" cast acrylic after a single pass). Now I am sad every time I look at this bit in my collection. I can't even bring myself to throw it away. I will replace it one day, hopefully.

I have only used this for cutting cast acrylic cnc vacuum attachments so far. however, it has done a perfect job every time. It cut fast, and, was as smooth as butter. I was completely satisfied with the finish after words as well. I had no chipping or hairline cracks at all. As far as tool life goes, I can't really say yet. Although it doesn't feel like it lost any of its sharpness. And, I have cut over 30 sets of these now. So, it is safe to say that once this one wears out, I'll be buying it again.

While I don't machine carbon daily, when I do I won't use any other bits. The finish is near perfect on the material and seems to last when others don't. Buy 4 of something else or one of these.

Great bit for small detail work. But bit is super fragile and broke before I could finish my first project.First bit came broken company quickly sent replacement.

Used to cut cast acrylic 3/16” edge smooth like glass. I will be ordering more soon.Update: 9-9-2019 quality of these bits has dropped a lot. I will be looking into another brand. What happened Amana, these bits were awesome and now not so much.

Cuts well until it doesn't. I've had two break cutting copper. Recommended speed for my device both in RPM and feed rate. both bits broke cutting 2mm copper.

Excelente

Nice bit works well on styrene and acrylic