×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Stainless material for output gear

Stainless material for output gear

Stainless material for output gear

(OP)
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.

RE: Stainless material for output gear

If it must be stainless steel, why can the
pinion be something other than SS?

I think a high nickle steel like 8620
or 4320 may be helpful if you are allowed
to use these for the pinions.

RE: Stainless material for output gear

Diamondjim - thank you for your suggestions for pinion material.

The ouptut shaft is exposed to harsh environments; the pinion is not.  The pinion should not be SS because SS against SS has a strong tendancy to gall.

Any thoughts on which SS for the output shaft / gear?

RE: Stainless material for output gear

Have to plead ingnorance on both ss materials.

RE: Stainless material for output gear

Custom 455 is a standard cres gear material.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources