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

Millingspeeds and Feeds chartMetric

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The basic edge shapes of carbide end mills has two types: straight shape and spiral shape. The helix angle can be divided into 30°, 45°, 50°, etc., and there are various types. Compared with the straight edge, the spiral edge end mill has the advantages of light cutting, smooth cutting, high efficiency and wide application range, so it has been widely used in milling processing. Now let’s introduce how to distinguish between use.

Aluminum milling speedchart

Jul 15, 2020 — Solved: When miling this out on my CNC, operation "contour1" and "packet" are cutting deeper than it should. The depth in the.

Lathespeeds and feeds chart

Due to their superior durability and cutting capabilities, cobalt drill bits are the premier choice for drilling stainless steel, regardless of its form. As ...

Only having used this tool a couple of times, I am completely satisfied with it's performance. I have used the bit to flush trim a few patterns in walnut and white oak. This bit moved right through the wood. The cut was very smooth. I am also happy that I will be able to turn / swap out the cutters.

Lathe cutting speedchartPDF

The choice of helix angle: for difficult-to-cut materials with low thermal conductivity of stainless steel and greater heat impact on the cutting edge, a large helix angle end mill is used for cutting, which helps to extend the life of the tool.

Carbide end Mill RPMchart

The role of helix angle: the greater the helix angle of the end mill, the longer the contact length between the workpiece and the cutting edge. This can reduce the load per unit length of the cutting edge, so the tool life can be extended. But at the same time, the cutting resistance will increase, so it is necessary to consider the use of a tool holder with high clamping rigidity.

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Why do these carbide drills for aluminium have such a small helix angle even though drills for soft materials should have a much larger helix ...

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Speeds and feedsformula

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2. Adopting multi-edge design, the tool has good rigidity, which can minimize the amount of tool letting in during side cutting.

Okay, above is the whole article for helix angel choice for end mill, hope it will benefit for you. For more information, please feel free to contact Melody!

Millingspeeds and feeds chartpdf

2. For difficult-to-cut materials whose thermal conductivity is low and the tip temperature rises easily during cutting, the unique shape of the blade can suppress the effect of cutting heat on the tip.

Cutting speedchart

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.

1. With 45° helix angle and unique groove shape, high-speed processing and high wear resistance are realized at the same time.

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Finally, the helix angle is one of the main parameters of the helix edge end mill. The change of the helix angle has a great influence on the cutting performance of the tool. With the development of CNC machining technology, the helix angle has been changed in the tool manufacturing process become possible. If we further study the various influences of the helix angle on the cutting performance of spiral-edge end mills, when manufacturing and selecting spiral-edge end mills, combine the performance of the machine tool and tooling fixtures, according to the performance of the processed material and the processing accuracy, Comprehensive consideration of factors such as machining efficiency, tool material and tool life, and optimizing the size of the helix angle will undoubtedly play an important role in promoting efficient and high-precision milling.

In addition, the characteristics of the finished surface change due to the helix angle. For example, when smooth finishing is required, sometimes a large helix angle type end mill can be used. However, when using a large helix angle end mill, the cutting resistance will increase, and the force of the right helix angle tool will also increase, so corresponding measures must be taken, such as using a tool holder with high clamping rigidity. Although the rigidity of the tool can be ensured, the small helix angle type end mill bits is sometimes used when the rigidity of the workpiece is low, such as thin plate processing.