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Thanks for your help. We have been using this combination of rack and pinion for many years and had no real problems, its just now we have found that sub contracted racks have a chamfer along each tooth and we are not adding one. Clearly the chamfer or a radius on the rack tooth tip makes a...

Hi israelkk We are using a dedicated rack cutting machine, a Sykes vertical hobbing m/c. The rack and pinion are 2.5 module, pinion has 20 teeth. Pinion is hardened and ground to ISO 1328 grade 6, rack is to ISO 1328 grade 10. Pressure angle 20deg

Thanks dimjim for your reply. I guess you could refer to it as tip radius, I'm not really sure whats its called. We are using a 20deg pressure angle. To give you a little more detail, we have in the past sub contracted some rack cutting and they have come in with a small chamfer on each rack...

Does anyone know if there is a standard for the amount of tip relief required on a metric 2.5 module rack we are using this with a 20 tooth pinion.

Can anyone suggest to good text book, with suitable calculations for working out the capacity of a helical rack and pinion for different materials?