sheet metal
Home | Library | Buyers' Guide | Sheet Metal Industry Ads | Support | Forum Home Page


Go Back   The Sheet Metal Shop > Sheet Metal Forums > Sheet Metal Talk

Sheet Metal Talk
General discussion for fabrication and layout work. No advertising on forums, it will be deleted.
       


Share This Forum!  
 
 
     

 

Reply
 
Thread Tools Display Modes
  #1  
Old 08-17-2005, 03:20 AM
tanayhan tanayhan is offline
Junior Member
 
Join Date: Jul 2005
Location: Turkey
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default eccentric reducer layout

I want to learn how to draft the sheet metal layout (flat pattern development on a sheet) of the eccentric reducer below. A=200 mm, B=300 mm, H1=400 mm. Angle of H1 and B is 90 Degrees and angle of H2 and B is 76 degrees.
The eccentric reducer is like this
A
|---------\
| \
| \
H1 | \ H2
| \
| \
| \
|----------------\
B
Thanks
Reply With Quote
  #2  
Old 08-17-2005, 12:15 PM
SteveB SteveB is offline
Professional Member
 
Join Date: Jul 2003
Location: West side of no man's land
Posts: 173
Thanks: 0
Thanked 0 Times in 0 Posts
Default Reducer layout

Tanayhan,
There are two ways to accomplish this.
The least time consuming way is to do what we call Rollation, or roll-out layout.
The way to accomplish this is to layout your eccentric side-- 1/2 of the total.
As shown in the image below.
Then, at the location where the circle/ellipse ends, bend that at 90 degrees.
This can be done to handle a dual eccentric/ellipse fitting, as well as a circle/ellipse fitting. You can set your slope angles accordingly as well.
Once you make this, you'll have a piece of metal that will allow you to "roll out" the two piece stretch out you're asking for. As you're rolling out the piece, have a helper, or another mechanic scribing onto the flat for you. I.e., it's a little challenging to do it by one's self.
Then, make sure you add for your connection flanges/acme/ etc... to make up the fitting.
As for layout of the eccentric/ellipse itself, Bud has that posted in his library. Go there and you can find it.
Attached Thumbnails
eccfitting_165.jpg  
Reply With Quote
  #3  
Old 08-19-2005, 11:47 AM
bordontn bordontn is offline
Professional Member
 
Join Date: Sep 2003
Location: McEwen, TN.
Posts: 213
Thanks: 0
Thanked 1 Time in 1 Post
Default

Tanayhan....you might try this
Attached Thumbnails
eccentric_fttg__2__174.jpg  
Reply With Quote
  #4  
Old 09-09-2005, 09:12 AM
R.CRAIG R.CRAIG is offline
Junior Member
 
Join Date: Sep 2005
Location: NORTHERN MINNESOTA
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Help, need info for laying out a stretchout for an eccentric reducer, rolation method won't work
for what I need.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


production products inc. ShopRPMachine
Show Your Banner Here?


All times are GMT -6. The time now is 09:40 PM.

Forum Supporters
production products inc.
ShopRPMachine
Any Industry Business
Can Display a Company Banner!
Click Here for Details

Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.