Dado (joinery)

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Ginkgo Scarf with Stub Tenons The shape of this joint echos the Ginko tree leaf and demonstrates the casino st ismier with which the CNC can cut complex curves into joinery. When routing plywood contour cuts are usually machined with a compression bit.

Corner Joints Corner joints, as the name implies, are used in joining pieces at a corner. Halving with Elliptical Tenon A halving joint is one where the two parts are each thinned by half and overlap one another.

Once fully through they hook above and below the mortises to lock them into place.

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In this case the hook extends fully through the piece providing some tensile resistance. This plywood is specified as mmxmmx18mm. Refers to joinery with mating surfaces not protruding through the visible faces of the pieces being joined.

The toolpath programming will be done for a certain thickness. This is a fairly tight fit but will work if the machine is very accurate and the tools are sharp.

It also has three movable shelves. Rather than moving the work piece over the tool, the work must be held securely while the tool moves.

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A gap needs to exist between the parts for them to slide by one another and provide a small space for glue. For this reason using "Stock to leave" and "Floor to leave" parameters in the CAM software can provide offsets to compensate for the variation.

In learning about CNC cut joinery it is well worth looking at the types of wood joints that have been cut with traditional tools saws, chisels, tablesaws, bandsaws, etc.

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When you see a deviation in thickness in some of the joints it is usually this material thickness difference which is the cause. Most of the joints shown below were cut with 0. Here the key is partially removed showing the grooved in each piece.

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That is, the details of the joint are only visible from one side. The joint is fully exposed at the corner. Here sistemi roulette hollywood narrower tenons are referred to as "fingertip" rather than "finger". This was done to allow the pieces to slide apart easily for demonstration purposes.

The ellipse comment jouer au blackjack a gratter in this joint provides mechanical resistance to pulling apart. In hardwood this often involves double-sided tape holding the parts to a spoilboard.

Thus the joint resists forces in all directions. Here's an example from the bookcase - the trim board on the edge of the shelf is joined along its length to the shelf: Shouldered Dovetail Halving Another half-lap variation with a dovetail. A joinery technique noted for its resistance to being pulled apart.

A cavity or hole in a workpiece, meant to receive a tenon. This joint is decorative compared to a normal half-lap but is also stable. In this joint the dovetails appear on both sides.

Clip Tenons The following joint is detachable. They are usually half-laps. Traditionally Machined Wood Joints Wood joints can be categorized in many different ways.

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The parts are identical. In actuality, the material thickness varies from as thin as 0. Butterfly keys are similar to this although they are symmetrical about their centerline these are asymmetric. The extension could be used as a hook: That is, it is set into a flat bottomed slot cut into the side panel. Tear out on the edge of pieces is more problematic with router bits.

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In a tight fitting joint this is very difficult to take apart so it can't be considered knock-down. Housing Joints Housing joints are often used in case construction. Fingertip Tenons with Key The lengthened tenons of this joint have a notch which accepts a key which secures the joint against tension.

Double Lapped Dovetail Double dovetails in this version. Later we'll see that the constraints of using CNC routers make clear that joints which are specifically designed or adapted to the process are the most suitable.

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A dado or groove is cut into each workpiece to half their thickness to allow the parts to overlap one another. Note also that the joint above uses a drill bit to clear the corner material.