In general, a blade with a positive hook angle is a faster-feeding blade and one with a negative hook is less aggressive.

"HSS" is the standard material used for all ICS HSS cutting tools. M2 has good red-hardness and retains its cutting edge longer than other general purpose high ...

Silver steel is not hard it is VERY tough. As such it is not easy to machine, but may be cut and filed easily.

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The rake or hook angle is the amount of forward or backward lean each tooth has. A hook angle can be thought of as the angle at which the tip enters the material. If the saw tip enters the material at an angle it will be more efficient than if it slaps down flat.

I had previously been doing all my slab flattening on a home made sled. It worked ok and it got the job done, but it had many limitations, some of which I didn't even realize until I started using the SpeTool sled. The first issue was that it had too much flex in the wood rails and would sag when I tried flatting slabs larger than about 20" wide. The second issue was the mess it made in the shop. It was actually so bad that I would have to use it outside. The biggest draw back however, wasn't realized until I started using the SpeTool sled. With the SpeTool sled I was able to work the router with the grain down the long side of the Slab This was something that I couldn't really do with my homemade sled. Working with the grain produces a smoother surface and is less work in my opinion. Then when you add in the dust collection, I was able to work in my shop again. Now I am not going to say you won't need to vacuum when you are done, but the mess is drastically less than with no dust collection. Also, the aluminum rails are much stiffer than my wood ones and don't flex nearly as much over larger spans. I would absolutely put this kit at the top of my list if I was setting a small garage shop up for slab flattening. Rob @ RM Woodcraft llc

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Using a saw blade with a positive hook angle to cut metal, such as aluminum sheet & extrusion as well as steel sheet, can be dangerous unless the stock is clamped both sides of the cut because the blade will have a strong tendency to grab the material causing the operator to lose control; therefore hook angles of 5° - 6° negative hook and between 0° and 5° positive hook are commonly used. However, if it is clamped both sides of the cut, the positive rake blade will give you a clean and fast cut. To prevent self-feeding, sliding miter saws and radial-arm saws require a blade with a negative tooth angle.

This is an investment! That being said, if you only doing one slab, I would recommend DIY build or having someone professionally flatten your project. I would hazard a guess that you would be saving for a fifth of the cost of this rig. I bought the dust shield with vacuum hose attachment and was disappointed on a few levels. Firstly, it's a gimmick that falls short of its intended purpose and although it may cut down a little of the waste being scattered in the shop, it does not work as advertised. Do your slab flattening outside or you'llbe vacuuming for days. Secondly the hose port fit is not standard for any shop vac, so you'll be needing some type of adapter. As for the router sled itself, the build is sturdy, and it does work as intended. However there is the minimal clearance issue. Even at its lowest setting, I still had to raise the work piece as the plunge depth of routers are limited. Also expect to clear debris (constantly) from wheel path as it collects and will hinder the smoorh and level tracking of the wheels Overall, it works. But I'm thinking I should have opted for the bearing rail system. I gave it 3 stars because that's where it falls in the overall rating. Average! These are my opinions from my experience. Your millage may vary. If I could send it back without the hassle. I probably would. I don't have the box, and the return policy says everything has to be in original unused condition, which is impossible after use.

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Diamond Coated Carbide is highly effective for machining most composite materials, ideal where tool cost is import or a special geometry is required. V.R. ...

I used the 1/8 x 1" compression bit for cutting 3/4 inch hardwood for wooden toys on my cnc. These bits outcut most of my other 1/8" bits by far with less heat problems and slippage in the chuck. I will order more when needed for sure. Great bits

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For cutting timber, a 20 degree positive hook angle is used on rip blades to pull the wood into the blade. Standard hook angles range from 5 to 15 degrees positive. Steeper angles, from 18 to 22 degrees, are most effective for ripping and cutting softer materials. Harder materials require a shallow angle such as 6 degrees. Cross-cutting is often best accomplished using with 5° to 10° hook.