Jan 7 2016

power tool replaced for Hobby CNC drilling

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power tool replaced for Hobby CNC drilling

Using a CNC machine for drilling is fairly common for projects that hobbyists or professionals intend to mass produce. Drilling will be something that those of you with a mill, router or lathe can use your power tool for. While any CAD/CAM software can be used to accurately control the feed and depth rate you will need to choose the right drill bit for your project before you get started on anything else. For your power tool there are two primary categories of bits that you can work with and some bits are specifically made to be the best when working with metal or wood on your CNC machine.

CNC drill  power tool

CNC drilling bit

Insert drill bits tend to be cheap, making them easily replaceable when they wear down and saving you the time you would otherwise need to sharpen them. They are also easy to use, having a ground structural point to help center the drilling operation and not needing to rely on a grind wheel. On the downside, insert bits can leave a burr in the exit hole so you will frequently need to smooth your material over after drilling. With the bits being so cheap you also run the risk of damage to your tool holder if the bits break, which could result in your tool holder needing to be replaced.
Twist drill bits are a common alternative to insert bits. Twist bits use a corkscrew flute pattern with the shape and sharpness of the flutes determining how each bit is best used. Due to this twist bits will require re-sharpening on a power tool grinder from time to time. Individually twist bits tend to be cheaper than insert bits, baring the cost of the grinder and the sharpening. They also have a lower chance of causing burring through exit holes so you will spend less time smoothing your material over after drilling.

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Metal drilling can be done with a large variety of different drill bits whether they are insert, twist or another configuration. The exact bit you will want to use is going to depend on what type of metal you are working with, how thick the material is and how fast you need to get your work done. However, there are a few drill bits that are commonly used for drilling through metal. Indexable bits are used very commonly with CNC drilling. They feature ceramic inserts that serve as cutting edges and a hardened cutting tip that lessens the frequency of needing to re-sharpen the bit. Indexable bits can drill very quickly and can make holes that are up to five times the diameter of the drill shaft. Spade bits are two part devices consisting of a metal body and a removable bit clamped into a slot. Usually spade bits are twist bits with notches along the cutting edge that are designed to eliminate long chips from clogging the drilling area. Do not get this confused with a woodworking spade bit; in woodworking a spade bit is used with hand tools, not power tools or CNC machines. Ejector bits are used for deep hole drilling and can be equipped with a single head or multiple heads. Single head ejector bits have a single cutting edge on the side that creates large holes while multiple head bits are used to make even larger holes. Multiple head bits also tend to have brazed carbide tips to improve cutting balance.

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Wood drilling, like metal drilling, can be done with generic bits or more specialized options. Because wood is softer than metal you will not need as much force while drilling and will not have to re-sharpen your bits as often. Flat bits use a flat cutting edge and a sharp center point to drill holes quickly. To avoid wandering while drilling thick materials many people use a pump to blow away excess sawdust when using this type of bit. Dowel bits are a variation of standard twist bits. They have a sharp center point for increased precision and a pair of adjoining cutting spurs for making accurate holes quickly. Augur bits are also twist bits but they have a wider cutting edge and only one outer spur, which cuts into the wood ahead of the edge. They also use coiled threads to keep sawdust away from the cutting point. Augur bits are slower than flat bits but they have much better accuracy.


Mar 17 2014

Wood jigsaw puzzle bi-plane 3d

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Wood jigsaw puzzle bi-plane 3d

biplane from Wood jigsaw puzzle website

biplane from Wood jigsaw puzzle website

The bi-plane 3d Wood jigsaw puzzle

 

Well this is the first post of many and i plan to post a new model every week or so with a free dxf wood plan for the project in our free downloads section. The bi-plane wood jigsaw puzzle is the first model that i am showing and to be honest i just found it in one of my drawers and thought that if i had to start somewhere, this would give me the motivation to do it!

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