![]() Most MAAG gear shapers are also capable of cutting precision spur and helical racks, with the addition of a table mounted rack-holding device or fixture. Utilizing the “HV-type” internal cutter head, internal helical gears can also be cut, using an appropriate helical guide. When fitted with type “JV” or “JVE” internal cutting attachments, internal spur gears can be shaped using conventional disc-type, or pinion-shaper, cutters, and/or “single-point” cutters (JV and JVE, Figure 4 and Figure 5 ). All MAAG gear-shaping machines are capable of both external spur and helical cutting, and with an “unlimited” maximum helix angle. Actually, the same cutter can produce spur gears or right- or left-hand helical gears, no matter the number of teeth or the helix angle.Īlso, the rack-type tools - combined with today’s new coating and carbide technologies–make the later-generation, larger-diameter capacity MAAG gear shapers formidable enough to finish shape-hardened gears, and capable of achieving precision parameters that can sometimes eliminate the need for an additional grinding operation (MAAG machine series SH-250, SH-250/300, SH-450, SH-450/500, and larger models).Īt the same time, it’s important to point out that even the older-vintage MAAG machines, if properly maintained, have been found capable of delivering almost unbelievable accuracy when compared to other types of gear-cutting machines - including some more-modern models. Since a “backing-plate” takes up forces when cutting, the rack-type cutter can be ground and reground until it’s only a few millimeters thick. ![]() Also, when sharpening the cutter by regrinding the face, the cutting-edge profile remains unchanged. these advantages are not to be underestimated. ![]() Especially for coarse-pitched and/or profile-corrected teeth - with tip relief, crest chamfer, protuberance, etc. The rack-type cutters are also relatively inexpensive to maintain, with their simplicity of design permitting precision in their manufacture and reliability in their inspection. Figure 1: Standard Cutters with straight teeth: roughing cutters finishing cutters pre-grinding cutters. The step-type cutters are normally used after the tooth spaces are gashed out with a single-tooth cutter. Special “step-type” cutters, which usually have just three teeth, are utilized for coarse-pitch, heavy-duty “plunge” cutting (scheme sketches, Figure 2 and Figure 3 ). In a great many instances, gear houses have actually learned to manufacture their own cutters (typical MAAG cutters, Figure 1 ). They are also easier to manufacture, and with relatively quick delivery. The rack-type tools are significantly less expensive than hobs especially heavy-pitch, large-diameter hobs. It can probably be said that the basic simplicity of the MAAG gear-cutting methodology–generating gears utilizing “rack-type” tools–factors most importantly in realizing this versatility and economy. For both small- and larger-diameter gears, the MAAG gear-cutting or gear-shaping machines soon became even better known as one of the most versatile and economical machines to be found. The very name soon became synonymous with the highest degree of precision, and many machine-tool builders actually began touting the fact that their particular machines incorporated MAAG-cut and ground change gears in each of their machine’s respective drives and mechanisms. Needless to say, his efforts led to the development and subsequent introduction of the world-famous MAAG gear-cutting and grinding machines. Initially, Maag’s principal aim was to produce gears of superior quality and precision than those being manufactured at the time. Max Maag of the MAAG Gear-Wheel Company of Zurich, Switzerland, in 1913. The well-known MAAG gear-cutting machine, as well as the MAAG gear-cutting methodology itself, were developed by Dr. ![]() Those not totally familiar with the MAAG series of gear-cutting machines may not understand why they are still highly valued for many gear-manufacturing applications. However, the great number of MAAG gear-cutting machines in worldwide operation - along with intermittent opportunities to purchase them as used machines–has resulted in a certain amount of invention borne of necessity. Since the last MAAG gear-shaping machine was built and delivered in 1990, it’s safe to say that the many outstanding advantages and capabilities that these machines provide are known and appreciated by only a few people in the gear industry.
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