Linear Encoders For Numerically Controlled Machine Tools-Books Pdf

Linear Encoders for Numerically Controlled Machine Tools
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Further information is available on the, Internet at www heidenhain de as well as. upon request, Brochures regarding, Exposed linear encoders. Angle encoders with integral bearing, Angle encoders without integral bearing. Rotary encoders, HEIDENHAIN subsequent electronics. HEIDENHAIN controls, Measuring devices for machine tool.
inspection and acceptance testing, Technical information regarding This brochure supersedes all previous. Interfaces of HEIDENHAIN encoders editions which thereby become invalid. Accuracy of feed axes, Further information, Safety related position measuring The basis for ordering from. systems HEIDENHAIN is always the brochure For comprehensive descriptions of all. EnDat 2 2 bidirectional interface for edition valid when the order is made available interfaces as well as general. position encoders electrical information please refer to the. Encoders for direct drives Standards ISO EN etc apply only Interfaces of HEIDENHAIN Encoders. where explicitly stated in the brochure brochure, Linear encoders 4. Selection guide 6, Technical features and mounting information. Measuring principles Measuring standard 8, Absolute measuring method 8.
Incremental measuring method 9, Photoelectric scanning principle 10. Measuring accuracy 12, Mechanical design types and mounting guidelines 14. General information 18, Functional safety 20, Specifications. Linear encoders Series or model, For absolute position measurement LC 400 series 22. LC 100 series 26, For absolute position measurement LC 200 series single section housing 30.
over large measuring lengths, LC 200 series multi section housing 32. For incremental linear measurement LF 485 34, with very high repeatability. For incremental linear measurement LS 400 series 38. LS 100 series 40, For incremental linear measurement LB 382 single section 42. over large measuring lengths, LB 382 multi section 44. Further information, Testing equipment and diagnostics 46.
Related documents 47, Linear encoders for numerically controlled machine tools. Linear encoders from HEIDENHAIN for Advantages of linear encoders Mechanical design. numerically controlled machine tools can If a linear encoder is used for Linear encoders for numerically controlled. be used nearly everywhere They are ideal measurement of the slide position the machine tools are sealed measuring. for machines and other equipment whose position control loop includes the complete devices an aluminum housing protects the. feed axes are in a closed loop such as feed mechanics This is referred to as scale the scanning carriage and its guide. milling machines machining centers Closed Loop operation Transfer errors from from chips dust and splashing water. boring mills lathes and grinding machines the mechanics can be detected by the Downward oriented elastic lips seal the. The beneficial dynamic behavior of linear linear encoder on the feed axis and housing. encoders their high permissible traversing corrected by the control electronics This. speed and their acceleration in the makes it possible to eliminate a number of The scanning carriage travels along the. direction of measurement predestine them potential error sources scale on a low friction guide A coupling. for use on highly dynamic conventional Positioning error due to heat generation connects the scanning carriage with the. axes as well as on direct drives in the recirculating ball screw mounting block and compensates the. Reversal error misalignment between the scale and the. HEIDENHAIN also supplies linear encoders Kinematic error through the ball screw machine slide. for other applications such as pitch error, Manual machine tools Depending on the encoder model lateral. Presses and bending machines Linear encoders are therefore and axial offsets of 0 2 mm to 0 3 mm. Automation and production equipment indispensable for machine tools on which between the scale and mounting block are. high positioning accuracy and a high permissible, machining rate are essential. Further information, Please request further documentation or. inform yourself on the Internet at, www heidenhain de.
Thermal characteristics Dynamic behavior Availability. Increasingly faster machining times with Efficiency and performance improvements The feed axes of machine tools travel quite. fully encapsulated machines cause ever in machine tools require ever higher feed large distances a typical value is 10 000 km. higher temperatures in the machine s rates and accelerations Of course they in three years This is why sturdy encoders. working space Therefore the thermal must not compromise machining accuracy with good long term stability are especially. behavior of the linear encoders used In order to transfer rapid and yet exact feed important they ensure the constant. becomes increasingly important since motions very high demands are placed on availability of the machine. it is an essential criterion for the working rigid machine design as well as on the linear. accuracy of the machine encoders used Due to the details of their design linear. encoders from HEIDENHAIN function, As a general rule the thermal behavior of Linear encoders from HEIDENHAIN are properly even after years of operation. the linear encoder should match that of characterized by their high rigidity in the A long service life is ensured by the contact. the workpiece or measured object During measuring direction This is a very important free photoelectric scanning of the measuring. temperature changes the linear encoder prerequisite for high quality contouring standard and by the ball bearing guidance of. must expand or contract in a defined accuracy of a machine tool In addition the scanning carriage in the scale housing. reproducible manner Linear encoders from the low mass of moving components Thanks to their enclosure special scanning. HEIDENHAIN are designed for this contributes to their excellent dynamic principles and if required a sealing air. behavior connection the linear encoders are, The graduation carriers of HEIDENHAIN particularly tolerant to contamination The. linear encoders have defined coefficients of complete shielding design ensures a high. linear thermal expansion see Specifications degree of electrical noise immunity. This makes it possible to select the linear, encoder whose thermal behavior is best. suited to the application, DIADUR Light, Scanning carriage linear scale source. Electronic, Sealing lips Mounting block, Schematic design of the LC 115 sealed linear encoder.
Selection guide, Linear encoders with slimline Cross Accuracy Max Measuring length. scale housing section grade interpolation ML, The linear encoders with slimline scale. housing are designed for limited Absolute position 5 m 0 1 m 70 mm to 1240 mm. installation space Larger measuring measurement 3 m With mounting spar. lengths and higher acceleration loads are Glass scale or clamping. possible through the use of a mounting elements, spar or clamping elements 70 mm to 2040 mm. Incremental linear 5 m 0 04 m 50 mm to, measurement with 3 m 1220 mm. very high repeatability, Steel scale, Small signal period.
Incremental linear 5 m 0 2 m 70 mm to 1240 mm, measurement 3 m With mounting spar. Glass scale 70 mm to 2040 mm, Linear encoders with full size Absolute position 5 m 0 1 m 140 mm to. measurement 3 m 4240 mm, scale housing, Glass scale. Linear encoders with full size scale, housing are characterized by their sturdy. design high resistance to vibration and, large measuring lengths As a connection.
between the scanning carriage and the, mounting block they have an oblique. web which permits vertical and, horizontal mounting with the same. degree of protection Absolute position 5 m 0 4 m 440 mm to. measurement 28 040 mm, For large measuring, Steel scale tape. Incremental linear 3 m 0 04 m 140 mm to, measurement with 2 m 3040 mm. very high repeatability, Steel scale, Small signal period.
Incremental linear 5 m 0 2 m 140 mm to, measurement 3 m 3040 mm. Glass scale, Incremental linear 5 m 0 8 m 440 mm to. measurement for large 30 040 mm, measuring lengths Up to 72 040 mm. Steel scale tape upon request, For measuring lengths 3040 mm 0 4 m at the butt joint at approx 3100 mm. Signal period Interface Model Page, EnDat 2 2 LC 4152 22 LC 415.
20 m EnDat 2 2 with 1 VPP LC 485, DRIVE CLiQ LC 495 S 24. Fanuc i LC 495 F, Mitsubishi LC 495 M, Panasonic LC 495 P. 4 m 1 VPP LF 485 34, 20 m 1 VPP LS 487 38, TTL LS 477. EnDat 2 2 LC 1152 26, 20 m EnDat 2 2 with 1 VPP LC 185. DRIVE CLiQ LC 195 S 28, Fanuc i LC 195 F, Mitsubishi LC 195 M.
Panasonic LC 195 P, EnDat 2 2 LC 211 30, 40 m EnDat 2 2 with 1 VPP LC 281 LF 185. Fanuc i LC 291 F, Mitsubishi LC 291 M, 4 m 1 VPP LF 185 36. 20 m 1 VPP LS 187 40, TTL LS 177, 40 m 1 VPP LB 382 42. Connectable to Yaskawa interface via EIB 3391Y, Measuring principles. Measuring standard Absolute measuring method, HEIDENHAIN encoders with optical With the absolute measuring method.
scanning incorporate measuring standards the position value is immediately available. of periodic structures known as graduations upon switch on of the encoder and can be. requested at any time by the subsequent, These graduations are applied to a carrier electronics There is no need to jog the axes. substrate made of glass or steel For to find the reference position The absolute. encoders with large measuring lengths position information is read from the scale. steel tape is used as the scale substrate graduation which is designed as a serial. absolute code structure A separate, HEIDENHAIN manufactures the precision incremental track is interpolated for the. graduations in the following specially position value and is simultaneously used. developed photolithographic processes to generate an optional incremental signal. AURODUR matte etched lines on a, gold plated steel tape typical grating. period 40 m, METALLUR contamination tolerant, graduation consisting of metal lines on. gold typical grating period 20 m, DIADUR extremely robust chromium.
lines on glass typical grating period, 20 m or three dimensional chromium. structures typical grating period 8 m, SUPRADUR phase grating optically. three dimensional planar structure, particularly tolerant to contamination. typical grating period 8 m and finer, OPTODUR phase grating optically. three dimensional planar structure with, particularly high reflectance typical.
grating period 2 m and finer, Along with the very fine grating periods. these processes permit high edge definition, and excellent homogeneity of the graduation. Together with the photoelectric scanning, method this high edge definition is critical. for the high quality of the output signals, The master graduations are manufactured. by HEIDENHAIN on custom built high, precision dividing engines.
Graduations of absolute linear encoders, Schematic representation of an absolute code structure with an additional. incremental track LC 485 as example, Incremental measuring method. With the incremental measuring method In the most unfavorable case machine. the graduation is arranged as a periodic movements over sizeable sections of the. grating structure The position information is measuring range may be necessary To. obtained through the counting of individual speed up and simplify such reference runs. increments measuring steps from any set many HEIDENHAIN encoders feature. point of origin Since the ascertainment of distance coded reference marks multiple. positions requires an absolute reference the reference marks that are individually spaced. scales or scale tapes feature an additional in accordance with a mathematical. track bearing a reference mark The absolute algorithm The subsequent electronics find. position on the scale established by the the absolute reference after traversing two. reference mark is gated with exactly one successive reference marks thus after a. signal period traverse path of only a few millimeters see. table below, The reference mark must therefore be, traversed before an absolute reference can Encoders with distance coded reference. be established or before the most recently marks are identified with a C following. selected reference point is found the model designation e g LS 487 C. With distance coded reference marks, the absolute reference is calculated by. counting the increments between two, reference marks and by applying the.
following formula, P1 abs R sgn R 1 N sgn R sgn D abs MRR. P1 Position of the first traversed N Nominal increment between two. reference mark in signal periods fixed reference marks in signal. periods see table below, abs Absolute value, D Direction of traverse 1 or 1. sgn Algebraic sign function Traverse of scanning unit to the. 1 or 1 right when properly installed, MRR Number of signal periods between. the traversed reference marks, Graduations of incremental linear encoders. Signal period Nominal Maximum, increment N in traverse.
signal periods, LF 4 m 5000 20 mm, LS 20 m 1000 20 mm. LB 40 m 2000 80 mm, Schematic representation of an incremental graduation with distance coded. reference marks LS encoder as example, Photoelectric scanning. Most HEIDENHAIN encoders utilize Imaging scanning principle. the photoelectric scanning principle Put simply the imaging scanning principle. Linear encoders for numerically controlled machine tools Linear encoders from HEIDENHAIN for numerically controlled machine tools can be used nearly everywhere They are ideal for machines and other equipment whose feed axes are in a closed loop such as milling machines machining centers boring mills lathes and grinding machines

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