Title: enlarged operating pitch dia Post by: Ricwin on November 13, 2020, 04:40:48 PM I have a gear to cut that has an enlarged operating pitch diameter.
I input into gearotic the following data: no of teeth 18 DP 7 pressure angle 20 deg left hand helix angle 30 deg tooth form involute face width 1.25" Gearotic calculate s a pitch diameter 2.969" the part print calls for "operating pitch diameter 2.686(enlarged)" In gearotic do I need to adjust pitch shift, height stub, tooth width? Title: Re: enlarged operating pitch dia Post by: ArtF on November 13, 2020, 05:05:07 PM Hi:
>>operating pitch diameter 2.686(enlarged) This could have a few meanings. Normally, this only means the pitch shift should be used, but that means typically the pinion to this gear should have a negative pitch shift of an equal amount. Do you have a photo or picture of the original part? The pitch shift is usually obvious in shape. It sounds as if your pitch diameter is already larger than you spec even before shifting? Art Title: Re: enlarged operating pitch dia Post by: ArtF on November 13, 2020, 05:15:49 PM Hi:
Checking the operation, it appears your looking for a Pitch shift of 0.87 on that wheel to match the intended diameter of pitch. Gearotic is reporting 2.57 diamter on the base helical spur of 18 tooth DP 7 Art Title: Re: enlarged operating pitch dia Post by: Ricwin on December 01, 2020, 04:39:21 PM Thanks Art. I will give this a try.
Sorry just getting back to you. I have been out of the office. Thanks, Greg |