Roughness on the surface of the treated wood surface details of the timber is always bumps of various shapes and heights, formed during the processing. On the resulting surface finish timber, the following irregularities of different origin: the risks of destruction bumps, bumps. elastic recovery, structural irregularities. Risks are the traces left on the treated surface of the working bodies of the cutting tools. The risks are shaped crests and grooves caused by geometrical shape of the teeth saws.
Irregularities elastic recovery are formed as a result of unequal size elastic buckling cutting tool surface layer of wood in areas of varying density. Different density and hardness of the annual rings of wood recovered after passage of the tool is not the same, resulting in which the surface treatment produces uneven. Structural irregularities are different in shape, size and location of the basin, obtained on the surfaces of products molded from wood particles, and due to the method of manufacture of these products and the arrangement of the particles. Hairiness – a presence on the surface treatment is often located partially separated fibers. In the shop floor to Comparative visual assessment of surface roughness polzuyuteya specially manufactured standards.
Each model is made from the same wood species and process issues. same kind of cutting, and controlled by that part. shop conditions for a comparative visual assessment of surface roughness polzuyuteya specially manufactured standards. Each model is made from the same wood species and process issues. same type of cut, and that controlled items.
For large volume production of metal products, containing fittings is advisable to use automatic lathes poluavtomatov.S their help is provided by an increase in the rate of production of parts and accuracy specifications of the products compared to manually processing workpieces on lathes stankah.Rezbonareznye work has been done with the dice, thread-heads, taps and cutters. Condition threading cutter requires kinematic dependence spindle speed of longitudinal feed reztsa.Na turning cam and a number of software to control (CNC) machines and semi-automatic kinematic schemes such dependence is not provided, so threading cutters can only be done when applying for these special extras and ustroystv.Dopolnitelnye devices are driven by gear, is placed on the rear end of the spindle, the movement from which a replacement guitar gear ring is transmitted to a special cam or screw, carrying out a longitudinal flow koretki Crusade supporta.Pri tapping is necessary that for one revolution of the spindle cutter shifted by an amount shaga.Taka as one operation by the tool in one revolution of the lead cam, the spindle speed is related to speed cam gear ratio, which is ensured by the selection of replacement wheels. Preservation of the equal and favorable conditions for cutting the left and right surfaces of the screw relative to the tool requires that face of tool coincides with the normal to each of the helical surfaces rezby.Eto a cut condition is met when the front face is inclined at an angle equal to the angle to create lift rezby.S on the tool back angle of the axis of the tool have higher axis workpiece when cutting threads and lower right – when cutting the left. These conditions provide a normal quality of thread-cutters work on automatic lathes and semiautomatic.