Previous in Forum: Star Delta Winding Motor   Next in Forum: Transformer Turn Ratio Deviation
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
8 comments
Rate Comments: Nested
J.SADASIVAM
Associate

Join Date: Sep 2009
Posts: 33

Stainless Steel Shaft of Blower Assy

01/23/2015 5:02 AM

Dear Sir

We wish to change S.S Shaft of blower assy fitted along with Motor 20 kw.

Motor side having M.S. EN8 Shaft and the same composite shaft which of SS is fitted in blower assy side.SS shaft is threaded inside MS Shaft.This blower assy used in annealing furnace 400 degree F to 500 Degree F.Customer is proposing SS Shaft of blower assy to extend to have one side of Motor bearing. Originally Motor used to have both bearing on MS shaft.The change in design of shaft will become SS shaft on one side bearing and other side MS shaft of motor.Whether it will affect Motor performance has one side of bearing is having SS Shaft

Which grade SS will be preferable for such application

Regards

Sadasivam
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Kulas
Power-User
Hobbies - Musician - New Member

Join Date: Dec 2014
Posts: 418
Good Answers: 3
#1

Re: Stainless Steel Shaft of Blower Assy

01/23/2015 11:29 AM

Talk to skf representative for high temp. and what service life you intend.

__________________
 "When I thought I exceeded to be wise but wisdom was far from me" -King Solomon
Register to Reply
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#2

Re: Stainless Steel Shaft of Blower Assy

01/23/2015 4:52 PM

Both the existing design and the proposed design seem very odd. A picture might help.

Since you are extending the fan shaft, why not extend it all the way through the motor, remounting the rotor?

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
yesyen
Guru
Popular Science - Evolution - New Member

Join Date: Jul 2006
Location: India-Chennai.
Posts: 722
Good Answers: 30
#3

Re: Stainless Steel Shaft of Blower Assy

01/23/2015 10:57 PM

Joining two pieces of shafts by a threaded joint is not good engineering practice, unless due cares are taken to ensure the trueness of the composite shaft. If the centres of both bearings are not established (like turning/skimming after the engagement of threads) premature bearing failure are likely to happen.

__________________
 A picture worth thousand words: needless to say if it is animated.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#4

Re: Stainless Steel Shaft of Blower Assy

01/24/2015 12:12 AM

This is a joke, right?

"Which grade SS will be preferable for such application"

So far, based on what you have said, any grade you can specify will do.

  • 201 Stainless Steel
  • 301 Stainless Steel
  • 301 Full Hard
  • 304 Stainless Steel
  • 304L Stainless Steel
  • 304 DDQ Stainless Steel
  • 305 Stainless Steel
  • 310/310S Stainless Steel
  • 316/316L Stainless Steel
  • 321 Stainless Steel
  • 347 Stainless Steel
  • 409 Stainless Steel
  • 409 UF Stainless Steel
  • 409 AL Stainless Steel
  • 410 Stainless Steel
  • 430 Stainless Steel
  • 439 Stainless Steel
  • 441 Stainless Steel
Register to Reply
suresh sharma
Guru

Join Date: Dec 2007
Location: Mumbai, India
Posts: 1983
Good Answers: 25
#5

Re: Stainless Steel Shaft of Blower Assy

01/24/2015 5:04 AM

I am hearing first time such arrangement, It wont last for long time as threading will wear out soon. Better have one shaft and ask motor mfr.

__________________
 "Engineers should not look for jobs but should create jobs for others" by Dr.Radhakrishnan Ex President of India during my college graduation day
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
James Stewart
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14331
Good Answers: 162
#6

Re: Stainless Steel Shaft of Blower Assy

01/24/2015 1:46 PM

For the purposes of being clear, I do not believe stainless steel to be useful or necessary in such an application. Especially when I learn that the part of the shaft(s) are being threaded together. Stainless steels typically have such a bad track record due to cohesive friction welding of the two metal surfaces together, I do not foresee a repeatable joining of the motor shaft and fan shaft. I would say abort this, and use some other form of coupling. Once that is done, then you will have equipment that is (a) serviceable and field repairable, and (b) you will not destroy fan or motor bearings so quickly.

__________________
 If it ain't broke, don't fix it. Just build a better one.
Register to Reply
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#7
In reply to #6

Re: Stainless Steel Shaft of Blower Assy

01/24/2015 2:39 PM

You are trying to apply logic, to an illogical request.
Register to Reply
Massey
Guru
Technical Fields - Project Managers & Project Engineers - New Member

Join Date: Jun 2014
Posts: 623
Good Answers: 33
#8

Re: Stainless Steel Shaft of Blower Assy

01/26/2015 8:11 AM

2250 Duplex SS is a good SS shaft material but I agree with others above that this 'sounds' like a bad idea.

__________________
 Hey Isaac, catch! ...oops, that's gonna leave a mark...
Register to Reply
Register to Reply
Have a Different Question?
8 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

James Stewart (1); Kulas (1); lyn (2); Massey (1); suresh sharma (1); Tornado (1); yesyen (1)

Previous in Forum: Star Delta Winding Motor   Next in Forum: Transformer Turn Ratio Deviation

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (47 right now)
Show Members
Advertisement