Joiner Cad

[Shane Rouse]

Iwanted to share a recurring problem in Knime, and how you think about solving it. Example: When I do a joiner between two tables with two columns in common, the number of rows increases significantly. A simple duplicate row filter is not ideal for this type of treatment because it eliminates many sensitive rows. I know that a groupby can often be viable, what else do you guys suggest or use in this case?

I would add that the columns brought in the group are also fundamental for this. Depending on, if you passed something like list and then had to pass the ungroup to pass it to the column, the groupby might have been irrelevant. But, bringing in the right columns can definitely solve this problem.

Joinery is a part of woodworking that involves joining pieces of wood, engineered lumber, or synthetic substitutes (such as laminate), to produce more complex items. Some woodworking joints employ mechanical fasteners, bindings, or adhesives, while others use only wood elements (such as dowels or plain mortise and tenon fittings).

Many traditional wood joinery techniques use the distinctive material properties of wood, often without resorting to mechanical fasteners or adhesives. While every culture of woodworking has a joinery tradition, wood joinery techniques have been especially well-documented, and are celebrated, in the Indian, Chinese, European, and Japanese traditions. Because of the physical existence of Indian and Egyptian examples, we know that furniture from the first several dynasties show the use of complex joints, like the Dovetail, over 5,000 years ago. This tradition continued to other later Western styles. The 18th-century writer Diderot included over 90 detailed illustrations of wood joints for building structures alone, in his comprehensive encyclopedia published in 1765.[2] While Western techniques focused on concealment of joinery, the Eastern societies, though later, did not attempt to "hide" their joints. The Japanese and Chinese traditions in particular required the use of hundreds of types of joints. The reason was that nails and glues used did not stand up well to the vastly fluctuating temperatures and humid weather conditions in most of Central and South-East Asia.[3] As well, the highly resinous woods used in traditional Chinese furniture do not glue well, even if they are cleaned with solvents and attached using modern glues.

As the trade modernized new developments have evolved to help speed, simplify, or improve joinery. Alongside the integration of different glue formulations, newer mechanical joinery techniques include "biscuit" and "domino" joints, and pocket screw joinery.

This must be taken into account when joining wood parts together, otherwise the joint is destined to fail. Gluing boards with the grain running perpendicular to each other is often the reason for split boards, or broken joints. Some furniture from the 18th century, while made by master craftsmen, did not take this into account. The result is a masterful work that may suffer from broken bracket feet, which was often attached with a glued block, which ran perpendicular to the base pieces. The glue blocks were fastened with both glue and nails, resulting in unequal expansion and contraction between the pieces. This was also the cause of splitting of wide boards, which were commonly available and used during that period.

In modern woodworking it is even more critical, as heating and air conditioning causes more severe respiration demands between the environment and the wood's interior fibers. All woodworking joints must take these changes into account, and allow for the resulting movement.[4] Each wood species has a general respiration rate; a generally-assumed time length for acclimating a board to its locale is 1 year per inch of thickness. In preparing raw wood for eventual usage as furniture or structures, one must account for uneven respiration and changes in the wood's dimensions, as well as cracking or checking.[5][6]

Wood is stronger when stressed along the grain (longitudinally) than it is when stressed across the grain (radially and tangentially). Wood is a natural composite material; parallel strands of cellulose fibers are held together by a lignin binder. These long chains of fibers make the wood exceptionally strong by resisting stress and spreading the load over the length of the board. Furthermore, cellulose is tougher than lignin, a fact demonstrated by the relative ease with which wood can be split along the grain compared to across it.

Different species of wood have different strength levels, and the exact strength may vary from sample to sample. Species also may differ on their length, density and parallelism of their cellulose strands.

Timber expands and contracts in response to humidity, usually much less so longitudinally than in the radial and tangential directions. As tracheophytes, trees have lignified tissues which transport resources such as water, minerals and photosynthetic products up and down the plant. While lumber from a harvested tree is no longer alive, these tissues still absorb and expel water causing swelling and shrinkage of the wood in kind with change in humidity.[7] When the dimensional stability of the wood is paramount, quarter-sawn or rift-sawn lumber is preferred because its grain pattern is consistent and thus reacts less to humidity.

All reinforcements using wood as the introduced spanning material make use of the item's cellulose fibers to resist breakage. Biscuits or dominos may provide only slight strength improvement while still forming a strong alignment guide for the joint's pieces.[9]

A joiner is an artisan and tradesperson who builds things by joining pieces of wood, particularly lighter and more ornamental work than that done by a carpenter, including furniture and the "fittings" of a house, ship, etc.[16] Joiners may work in a workshop, because the formation of various joints is made easier by the use of non-portable, powered machinery, or on job site. A joiner usually produces items such as interior and exterior doors, windows, stairs, tables, bookshelves, cabinets, furniture, etc. In shipbuilding a marine joiner may work with materials other than wood such as linoleum, fibreglass, hardware, and gaskets.[17]

The terms joinery and joiner are in common use in Canada, UK, Australia, and New Zealand. The term is not in common use in America, although the main trade union for American carpenters is called the United Brotherhood of Carpenters and Joiners of America.

In the UK, an apprentice of wood occupations could choose to study bench joinery or site carpentry and joinery. Bench joinery is the preparation, setting out, and manufacture of joinery components while site carpentry and joinery focus on the installation of the joinery components, and on the setting out and fabrication of timber elements used in construction.

In the history of technology in Europe, joinery was the medieval development of frame and panel construction, as a means of coping with timber's movement owing to moisture changes. Framed panel construction was utilised in furniture making. The development of joinery gave rise to "joyners", a group of woodworkers distinct from the carpenters and arkwrights (arks were an intermediate stage between a carpenter's boarded chest and a framed chest).

The original sense of joinery is only distantly related to the modern practice of woodworking joints, which are the work of carpenters. This new technique developed over several centuries and joiners started making more complex furniture and panelled rooms. Cabinetmaking became its own distinct furniture-making trade too, so joiners (under that name) became more associated with the room panelling trade.

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's get placed here -->XReplies esch5995 Jul 19, 2022 11:23pm #1Although biscuit jointers have their place for alignment and other light duty tasks and I still occasionally breakout my Porter Cable if you want a truly easy way to get the strength of a mortise and tenon joint there is only one answer but it comes at a cost and that's a Domino.

I have a biscuit jointer and use it often for alignment.

If I could have only one, it would be the Domino.

If I bought a Domino, I would probably still use my biscuit jointer. Biscuits are cheap.

Domino. Better, faster, stronger. Easier glueups with no slop. A fave move is to carefully align one domino with the slots cut for zero clearance and dry fit. If the side to side alignment is perfect I can put in the others with one side cut wider, if it's not I try again until I have one perfect and just widen the other attempts. No more worry about side-to-side alignment.

Well if you find a Domino at an estate sale cheap, then by all means buy it. But you probably wont. Thats a high-end tool (for me) that wouldn't be worth buying new for the low-end hobby woodworking I do. They have a different purpose than a biscuit joiner. I use biscuits for panel glue-ups (alignment as was mentioned above) and maybe reinforcing small joints. But they're not a substitute for the mortise-tenon joints used in larger furniture, for which a domino can be. Now, if money is not a problem, go for it.

First of all, I use M & T joints for things like table legs to apron joints. I use biscuits for things like miter joints on things like chess board frames and small table table tops. The miter joints could be damaged by impact loads by dropping so that is why I use them there, no data to support this.

For the future guys, who will look for answer after 2017:As for now, you actually can re-create joiner with the same name, by issuing % set comma = joiner(", ") % again and again. In this case the joiner is reset every time and behave in the way you expecting. Checked with Ansible 2.8

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