SpeTool Spiral Router Bits with UpCut 4 inch Extra Long1/4 inch Cutting Diameter 2 inch Cutting Length CNC Router Bit Carving Tool

I have used two and broke two of these. Total time on bit one was 15 minutes, bit 2 lasted only 8 inches. These were used at a very slow feed rate. I will not buy another one of these bits. I needed the long length but unfortunately the bits did not survive.

I have never used a bit this long before. I was having some problems controlling it. I suspect control would come with time.

Worked great on the 1 1/2 inch mdf. Got the done. After the job the operator tried it on some 1 1/2 inch oak with out changing speed/feed. He got 2 of the 6 3/4 thru holes before the bit snapped.

Needed to create several 2 deep, 1/4 wide dados and thought this bit would do the job. Because this bit is so long I was concerned that the bit would be prone to breaking as some have reported. I tried a 1/4 deep pass (typical for shorter bits) but the chatter was too great. I reduce the cutting depth to 1/8 and chattering was still unacceptable and the dado cut was not clean. I finally decided, using 1/8 depth of cut to do a series of multiple plunges (ie used the bit like a drill bit) across the length of the dado (roughly every 1/4). This serves to hog out a lot of the material but puts no lateral stress on the bit. I then came back after the drill cuts and used the bit normally to remove the rest of the material. There was little to no chatter at this point as much of the wood had already been removed. It was slow and tedious but the resulting dados were flawless.

Went to make a test cut on a half inch thick piece of wood and the bit snapped within 30 seconds.

Even taking very shallow cuts (~ 1/8) this bit did nothing but chatter. This left a horrible shoulder on my mortise. I switched to using a shorter bit from whiteside for the first portion of the cut, and it cut like butter. I am glad this mortise will be hidden, because otherwise this bit would have ruined my project.

Bought this bit for my circle jig and it did not last at all. Got about half ways of a circle (17”) and it snapped.

Managed to cut out 21 pieces for a custom order of corbels. Had to do conservative cuts due to the length of the bit but was able to complete all the cuts with just one bit. 33 in/min, 18k spindle speed, .125 depth of cut.

Quick tip: There is No 1/4 bit at a 2 cutting depth should be taken full-pass, unless its foam. Pretty much any bit at that side-load will stress and break at full depth. Easy pass depths and slow feed rates are the only hope. I consider this a specialty bit when working on deeper materials, just for the reach- never full depth. For XPS Foam (80% air), works great!

Use in my cnc for 1.5 inch pine and while cutting multiple passes all stayed aligned.