HHIP 2007 0021: Advanced Interchangeable Counterbore Set for Precision Machining Review

It was rusty inside and the set screw holding the rail didn't go deep enough to hold the rail in place. Either the threads are not fully cut or rust has blocked the threads. Attempting to drive the set screw deep enough to engage the rail resulted in the screw becoming irreversibly wedged. Also, the guides, bits, and holder seemed to be of acceptable quality, but I couldn't cut anything with them.

the quality here is doubtful. I don't see any markings, but I suspect they were made in a densely populated country in the Far East. I had to drill out the bit holder to fit the individual bits. They were a few thousandths too small and they didn't fit. In addition, the fit between the guide shafts and cutting tools is imprecise and can allow for eccentric holes. I haven't tried them on any significant quality materials like steel, but I'm not optimistic. I would look at auctions for a set of…

Same problems as others. The tool holder was rusty on the inside, the socket head of the lead screw was stripped and stuck in the tool holder body. And the tracks weren't deep enough to pinch the pilot. Luckily I have a lot of machines and equipment. I was able to drill out the stripped/stuck set screw and tapped the hole. I had to buy a new grub screw M4x0.7. I was able to use this cutter, but not without repairing it first. If it was something Harbor Freight was selling, it would probably be…