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tanayhan 08-17-2005 04:20 AM

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
| \
| \
H1 | \ H2
| \
| \
| \

SteveB 08-17-2005 01:15 PM

Reducer layout
1 Attachment(s)
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.

bordontn 08-19-2005 12:47 PM

1 Attachment(s) might try this

R.CRAIG 09-09-2005 10:12 AM

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

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