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Pages Design Considerations A-2 > to A-54 > A series > ( screw driven ) B-1 > to B-34130 > B & 110 series > ( screw driven ) and 120 series > ( belt driven ) C-1 > to C-52100 > C series > ( screw driven ) D-1 > to D-3290 > D & 170 series > ( screw driven ) and 180 series > ( belt driven ) E-1 > to E-54160 > E series > ( screw driven ) G-1 > to G-30150 > G series > ( screw driven ) H-1 > to H-28200 > H series > ( screw driven ) I-1 > to I-28250 > I series > ( belt driven ) K-1 > to K-30550 > K & 400 series > ( rotary tables ) L-1 > to L-11300 > L Terms of Sale > Inside Back Cover

Sometimes a standard positioning system is not the right choice for a particular motion control application. Nor is it possible,or practical, to have the system built in house by your own design team. Let > ECH take a look at your special require-ments. > ECH has been designing and building custom positioning systems for over 30 years. We can use our many yearsof experience to help you select the right approach to a unique motion control problem. Fill out our application guide on page A-45 and fax it to us. We stand ready to assist you. Two carriages (individually driven by two motors) on the...

X-Z visioninspection stationmounted on steel sub plate X-Y machine assemblyprocess with steel support structure Belt driven longtravel X-Y-Z inspection station with aluminum support structure A

X-Y-Z high accuracychemical coating process mounted on granite & aluminum support structure X-Y axiswater jet cutting process with open frame steel support structure Two individualX-Y axes for laser cuttingprocess supported by steel structure A-6

A X-Y belt driveninfared inspection stationsupported by movable aluminum structure X-Y laser marking assemblywith granite surface support structure X axis machining stationwith steel support structure

Rotary Positioning Tables use a precision machined wormgear assembly and either ball, cross roller, or angular contact bearings to support the table top load. Different gear ratios allow for either high resolution or high speed in a low profile package. The use of any step motor, or servo motor system to drive this rotary table is a key advantage. This allows the use of a preferred motion control system. Rotary Positioning Systems consist of mainly threedifferent major designs to choose from. These are mechani- cal tables, direct drive tables, and rotary positioning tables. Direct Driven Rotary...

When selecting a positioning table, each of the following items should be reviewed thoroughly by the user. Some itemswill not be of major importance for a specific application. However, by reviewing each and every item, a positioning table can be selected that will give the required performance over the life of the system. A Bearing Designs - Linear (ball, cross roller, round rail, square rail, and air) bearings, along with rotarybearings. (See pages A-10 to A-12) Drive Mechanisms (acme screws, ball screws, belt, and worm gears). See pages (A-13 to A-15) How to Select a Positioning Table which...

Cross roller linear bearing tables are very similar inoperation as the ball & rod bearing tables. The rolling balls are replaced with cylindrical rollers, and the steel rods are replaced with ground "V" ways. The larger surface contact between the rollers & "V" ways typically increases the table load capacity by up to 3 times more over a comparable ball & rod type system. These table designs also produce better flatness and straightness specifications over the ball & rod type. Thus they are typically used in higher accuracy type of applications. However, they have the same disadvantages as the...

Round rail linear bearings use four bushings with recircu-lating balls which are mounted within either two, or four pillow blocks. The pillow blocks are then mounted to the carriage, which rides on two round, hardened & ground shafts (which are mounted to the base). Travel lengths are only limited by the available shaft and base length. The point contact between the recirculating balls in the bushing and the round shaft produces a very low friction positioning table. The greater number of balls contacting the ground shaft over a ball & rod type table, provides for a larger load capacity system....

Air bearing linear tables create a small air cushion betweenthe table carriage and the table base (guide rail). This provides a non-contact linear bearing system that is rigid, friction free, and cog-free. Using a very accurate guide rail (rectangualr or square) can produce excellent flatness & straightness specifications. Typical drive mechanisms include high accuracy acme screws and linear motors. Using a high accuracy non-contact linear motor drive system, and a high accuracy non-contact linear encoder, can produce a very accurate positioning table, one that could virtually last forever. >...

Ball screws are the screw of choice for high duty cycle,high speed, and long life applications. The ball screw nut uses one or more circuits of recirculating steel balls which roll between the nut and ball screw grooves, providing an efficient low friction system. The nut, which is attached to the table carriage, moves back and forth with the linear bearing system as the screw rotates. Using a higher lead ball screw (for example a 0.500 inch lead instead of a 0.200 inch lead) will offer greater carriage speed for applications requiring rapid traverse, or fast, short incremental moves. Low wear...

Maximum speed of a screw driven > positioning tabledepends on the screw diameter, screw lead, screw length, and the screw end bearing supports. Preloading of an acme, or ball screw nut is the process ofeliminating backlash within the nut assembly. Eliminating the backlash in a nut becomes important for those applica- tions requiring good bidirectional positioning and repeat- ability. Also, eliminating nut backlash can help stabilize an electronic motion controller. Some assemblies use two nuts that are separated by a spring (or spacer) which provides a force between the two nuts. This process...