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Making of Lead Screws |
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Ballscrews
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Internal Recirculation |
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High Speed Line |
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FAQ
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Lead screws are distinguished from other forms of linear transmission systems mainly by their reproducibility, their non-slip properties, high resolution and low installation dimensions. The precision of a transmission system depends largely on the quality of the drive screw and its nut. High efficiency, linearity, consistent torque and a long service life are factors which - although in principle mutually exclusive - together form the ideal characteristics of a perfect transmission system. |
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The static
properties of the screw and nut assembly itself are determined by
multiple, often conflicting factors: Minimal flank backlash between
the nut and screw means optimum reproducibility but at the same
time places increased demands on the screw thread geometry. A higher
bearing percentage on the screw flanks improves axial load-bearing
capacity and service life on the one hand, but is reflected on the
other hand by greater sensitivity of the screw-nut system to production
tolerances. |
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Our many years experience as a specialist in the production of highprecision lead screws plus the use of the very latest production and testing methods are the assurance of a substantial technological advantage for our customers. The screw blanks are normally formed on modern CNC machines. 4, 5 and 6-axis machines permit practically any complete machining process including slicing and finish |
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| machining of the second side. Automatic rod feed and an NC controlled tailstock permit the machines to work without operating staff - a saving which means a further economical advantage for our customers. The method of heat treatment is decisive in avoiding the distortion of the screw, and so plays an important part in the quality achieved during the precision machining process. STEINMEYER has not only the know-how it takes, but also the equipment. High and medium-frequency induction hardening, salt bath hardening, tempering and stress-free annealing are further processing stations in the production sequence of a screw, and are handled with the same professional competence at STEINMEYER as cylindrical grinding, which creates the conditions for optimum precision during the following thread production process. High-precision threads are produced at STEINMEYER exclusively by means of grinding. Profile accuracy, a constant flank diameter, precise pitch and optimum surface quality are all factors which determine the backlash-free interaction of a threaded screw and nut. STEINMEYER has its own fully airconditioned thread grinding shop with adjoining gauge room. The central supply of all the thread grinding machines with cooled and purified grinding oil is just as much a matter of course as the dressing of grinding wheels with CNC controlled diamond dressing devices. Continuous in-process controls ensure the quality of the end product right from the initial stages - whether for a first prototype or series production. For applications involving less stringent requirements as regards pitch accuracy or concentricity tolerances, thread rolling or cutting represent a cheaper alternative to grinding. Both production methods are increasing in popularity in applications where the threaded screw does not require subsequent hardening, such as for example in cases where a steel screw is combined with a nut in brass, bronze or a special plastic material. | |
| The production of nuts for your screw and nut assembly poses equally stringent quality requirements. Our own toolbuilding shop is evidence of our flexibility and commitment in the service of our customers - lead screw taps even in special forms are no obstacle, at least not for us. Complicated forms on screws or nuts in conjunction with a high accuracy requirement present as little of a problem as galvanization, |  |
| scale graduation or other markings. 70 years in the construction of measuring instruments result in a wealth of experience and know-how all to your advantage. The skill of our measuring instrument specialists once again proves decisive in ensuring easy running properties in high-precision screw and nut assemblies. Pairing a screw with a nut is far more than simply assembly work. Only when a screw and nut assembly - screwed between finger and thumb - has the same feel as a highgrade micrometer screw are we satisfied. And neither should you settle for less. Screw and nut assemblies differ as widely as their applications. There is no standard program to be stocked. The survey provided on the next page is intended to offer examples of possible execution types. Do not hesitate to ask us - let our experience help you answer your transmission problems. | |