Double end tenoners are just extensions of single end tenoners as they are double sided machines. Doing two sides at once, as in double-sided edgebanders, they have a chain drive on both sides of the machine. The operator places the part onto the chain and it takes the piece through the machine. The part can either be a solid wood piece, for example, a rail which can be as narrow as 1" x 1" or a panel. Certain operations will be done to the ends of these parts as they pass the different heads. In the panel industry, it could be used for squaring up a door or any other part before certain other operations have to be done to the panel. The double end tenoner could put a groove into the panel or a shape on the edge or a tenon for chair parts. These machines will do repetitive work so all parts are exactly the same as each other when edge work or two sides of a part (be it solid or panel) are required.
The chain normally has attached to it in some form, a part called "dogs" which pushes the piece through the machine so that the part rests against these metal "dogs". When the double end tenoner is properly set up, the "dogs" travel at 90° to the fence being perfectly lined up on both chains on both sides. Some of these machines are very sophisticated and complicated, and could have possibly up to 15 heads on each side. Traditionally, however, three, four and five heads on each side is most common. In most cases, the configuration would be: first a scoring head, just to pre-score so that the piece on the underside does not chip; the second head is a hogging head, which would cut the part down to size and square and hog off excess material; and the third head could be a tenoning head or a universal head (universal heads in any machine will tilt through 90 to 180° plane). These heads will all be for different operations and can cut the part from different angles, top, bottom and at 45°. These types of machines could also have jumping heads to do "blind" cuts, that is cuts that do not go all the way through the panel, or corner rounding heads for table tops for office furniture. In certain large companies, two double end tenoners can be placed in line with each other with a panel turner so that all four sides of the material can be worked on in one pass. Normally used for squaring the panel. Some of these machines might have top driven pressures, which will allow the part to be fed behind the "dog" instead of in front of it, which becomes relevant if long pieces are needed to go through these machines. Some of these machines might also have jump routing or some type of drilling attachment. Some newer more expensive machines are being made with C.N.C. controls to speed the set up of the machine, as these machines often take long to set up.
MANUFACTURERS OF THESE MACHINES INCLUDE:
Activa, Argemi, Celaschi, Challoner, Fletcher Tolbert, Friulmac, Gabbiani, GMC, Greenlee, Homag, IDM, Jenkins, Mereen Johnson, SCM, Torwegge, Tos, Wadkin, Wehrmann.
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