Device for angularly precise machining of a workpiece by a tool guided on a guide rail

A device for the machining of a workpiece by a hand-operated tool guided along a guide rail, the device comprising:

• at least a work-plate, a guide rail configured to mount the hand-operated tool thereon, and a set of at least three position devices, wherein the work-plate comprises a plurality of holes and is configured to mount said at least three position devices substantially free of play at least partially within the plurality of holes in the work-plate,
• wherein a first position device of the at least three position devices is received in a first hole of the plurality of holes, a second position device of the at least three position devices is received in a second hole of the plurality of holes, and a third position device of the at least three position devices is received in a third hole of the plurality of holes;
• wherein the first and the second position device of the at least three position devices are in direct contact and abutting an outer edge of the guide rail such that a position of the guide rail is defined;
• and wherein the second position device and the third position device of the at least three position devices or the third and a fourth position device are configured for direct contact with an outer edge of the workpiece such that a position of the workpiece is defined;
• whereas the locations of the first, second, and third holes define a definite and reproducible machining angle between the guide rail and the outer edge of the workpiece;
• whereas the first, second, and third position devices can be located in respective ones of the plurality of holes to select the reproducible machining angle, said machining angle being one of a plurality of preset machining angles that includes 45 degrees, 90 degrees, and at least one angle therebetween;
• whereas the machining angle can be varied by relocating at least one position device of the set of at least three position devices by using a fourth hole or by using at least one position device of the set of at least three position devices of a different dimension or shape or by using rotatable position devices which are lockable in rotation and are out-of-round shaped or mounted eccentrically.