Posted by Ross Marley on June 05, 2024 at 14:11:11:
Hi everyone
To save money on jobs we manufacture racks which insert into a holder like a hob. These are ground accurately to the stated size over pins and angle. These blades/racks also have lead angles. We regularly cut gears that have a different module or pressure angle to the cutter (as long as the base pitch is very similar). I wondered if there was an equation that stated the difference in base pitch between the cutter and the gear what would that equate to in profile error of the gear. I am guessing the tooth depth plays a big role as the larger the more error will occur.
For example if I cut a gear with a 7.5 base pitch and use a cutter that was 7.48 base pitch what profile error would that equate too over whatever distance ?
Thanks