The Deformaton of The Gear Hob’s Generating Surfaces Due to Re-Sharpening

Open access


The side relief faces of the monolithic involute gear hob are machined through relieving. The resulting surfaces are bevel helical surfaces in which the side cutting edges result from the intersection of these with the helical rake face. Theoretically, the gear hob is derived from an involute worm. Resharpening decreases the diameter of the hob, thus the edges became closer to the axis, and as a consequence they will be situated on a smaller worm than the original. The present paper analyses the deviation of the re-sharpened gear hob’s carrying worm from the theoretically perfect involute worm whose characteristic dimensions were adjusted considering the re-sharpened gear hob characteristic diameters. It was proven that the evolution of the errors is significantly different from that described in the literature. Thus, increasing the new gear hob diameters in comparison with the calculated dimensions is unnecessary, because it cannot reduce the error to half with this procedure. The mathematical model was built up accepting that the edges result from the intersection of an involute worm with a helical rake face and the side relief faces result from the rototranslation of the edges on a bevel helix leading curve dressed by the relieving parameter.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] Radzevich S. P.: Dudley’s Handbook of Practical Gear Design. CRC-Press London 2016 368–379.

  • [2] Litvin F. L.: A fogaskerékkapcsolás elmélete. Műszaki Könyvkiadó Budapest 1972 187–190.

  • [3] Hollanda D.: Bazele așchierii și generării suprafețelor. Petru Maior University Târgu-Mureș 1994.

  • [4] Máté M.: Hengeres fogaskerekek gyártószerszámai Erdélyi Múzeum-Egyesület Cluj-Napoca 2016 187–206.

  • [5] Dudás I.: The Theory and Practice of Gear Worm Drives Penton Press London 2000.

  • [6] Radzevich P. S.: Gear Cutting Tools. Fundamentals of design and computation CRCPress London 2010.

  • [7] Gyenge Cs.: Lefejtőmarók oldalhátszögének pontos meghatározása és optimálása Gép 48/10. (1996) 38–40.

  • [8] Máté M.: A hengeres fogaskerék-lefejtő csigamaró működő élgeometriájának vizsgálata. In: A XVII. Műszaki tudományos ülésszak előadásai MTK6. (2016) 137–147.

  • [9] Szeniczei L.: Általános fogazás. Nehézipari Műszaki Könyvkiadó Budapest 1957.

Journal information
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 76 76 46
PDF Downloads 20 20 0