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

This bit has served me well, use it on my cnc router. The price is very cheap for bits but the quality is there.

This tool is a great way to get your idea onto a piece of wood and make it look great.

I needed something with some length so I can use with my router and templates and this works great

Needed this to cut multi later birch plywood 1.5 thick. Just went down in 1/4 steps and it cut fine. Because of its long length just go slower than you usually would with a short bit . Longer bits tend to break if you apply too much force. Great bit for the price and cut better than I expected very clean edges.

I needed this to CNC 1.75 inch thick glue up panels. At the time of this review probably have 100 hours on this but and its still working as well as the first day I used it.

This was much sharper and much more high quality than anticipated for the price. Ive used it now to cut several table tops with a router jig and it performed flawlessly.

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.

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!

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.

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.