MrClean
Mechanical
- Feb 15, 2006
- 6
I am designing a spur gear set to be used in a remote controlled device. The output shaft gets exposed to nasty environments (salt water, grit, etc.) so must be SS. In the interest of reliability, keeping number of operations down, etc., I’m planning to make the output shaft/gear from a single piece of metal. Gear o.d. about 1.5”. Shaft about 3/8” dia x 3” long. AGMA 2000-A88 Q8. Couple of questions:
1. I’m considering 13-8 PH vs. 17-4 PH for the output shaft/gear. The obvious goals are to keep performance up and cost down. Toward that end, I was thinking of simply buying material in the heat treated condition – Rc 33-38, machine the blank, cut the teeth, check over-pin measurement, ship the part. No grinding of bearing journals or teeth. Which material would you recommend – 13-8 or 17-4?
2. Pinion material: I know stainless against stainless is a bad combination for gears. How about SAE 4140 for the pinion?
Any other comments or suggestions would be appreciated.
1. I’m considering 13-8 PH vs. 17-4 PH for the output shaft/gear. The obvious goals are to keep performance up and cost down. Toward that end, I was thinking of simply buying material in the heat treated condition – Rc 33-38, machine the blank, cut the teeth, check over-pin measurement, ship the part. No grinding of bearing journals or teeth. Which material would you recommend – 13-8 or 17-4?
2. Pinion material: I know stainless against stainless is a bad combination for gears. How about SAE 4140 for the pinion?
Any other comments or suggestions would be appreciated.