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Laminated Rotors
By daleh007, Section Wind Posted on Wed Mar 23, 2005 at 03:21:56 AM MST
What do you think about grain orientation?

I carved several blades from solid pieces of Doug fir (green that have dried a couple of months). In all but 1 case I get some serious warpage (of course in the wrong direction). I took some 2x8's that have been drying for several months and cut them into 1.5" squares which I then laminated together. When I laminated the strips together I alternated the grain vert hor vert etc. thinking that this would help to eliminate the warpage issue. Any comments regarding the alternating of the grain orientation? Oh, and what about end for end alternation in addition to the vert hor orientation?
Daleh007

Laminated Rotors | 7 comments (7 topical)

Re: Laminated Rotors (3.00 / 0) (#1)
by Radomike on Tue Mar 22, 2005 at 09:15:28 PM MST

daleh007:
Check out the end grain of your boards, and see which way the annular rings curve.
With moisture change, wood expands and contracts like a fan unfolding and folding in this direction.
If you glue up like so: (end-grain view)
(
)
(
) each piece counteracts its neighbor's warp.
You probably have a bunch of quarter circles in end grain, rather than half circles, which is even more stable. Whenever possible avoid the centers of trees--hence the preference for quarter sawn wood--as it is the hinge of the 'fan'.
Experiment will tell you more than I know.

Don't you mean "laminated blades"? (3.00 / 0) (#2)
by Ungrounded Lightning Rod on Tue Mar 22, 2005 at 09:45:36 PM MST

I was under the impression that "rotors" referred to the moving part of the generator, not to the turbine.

Re: Don't you mean "laminated blades"? (3.00 / 0) (#3)
by TomW on Wed Mar 23, 2005 at 05:19:23 AM MST

Rod;

Well, I think we have a semantics problem here.

Sure seems like we have Magnet Rotor and Wind Rotor being referred to as "Rotor".

I find it hard to believe that anyone would seriously consider a cast iron blade set but on this forum no crazy suggestion would really surprise me at all.

Plus its like a game of Post Office in these threads. A question about rectifiers can easily end up a discussion on septic tanks and sewer systems. Just the joy of diversity I guess.

End of rant!

Cheers.

TomW

The Truth is the Truth, even if no one believes it; and a lie is a lie even if everyone believes it

[ Parent ]

Re: Don't you mean "laminated blades"? (3.00 / 0) (#4)
by daleh007 on Wed Mar 23, 2005 at 02:31:26 PM MST

What has this comment to do with the post? And yes, the term applies to both.

[ Parent ]

Re: Don't you mean "laminated blades"? (3.00 / 0) (#5)
by TomW on Wed Mar 23, 2005 at 02:59:37 PM MST

dale;

Nothing. Thats the "point". Was actually relevent to another story / thread where the terms get used out of context.

Chill out don't take it personally.

The Truth is the Truth, even if no one believes it; and a lie is a lie even if everyone believes it

[ Parent ]

Re: Don't you mean "laminated blades"? (3.00 / 0) (#6)
by Ungrounded Lightning Rod on Wed Mar 23, 2005 at 08:13:07 PM MST

Hi, Dale.

I just came from a post where we were talking about
building a (magneto) rotor out of a stack of steel
laminations and the relative merits of steel versus
cast iron.

I saw the title of this one, "Laminated Rotors",
thought it was on the same subject, then found
you were talking about the turbine blades. This
derailed my brain.

Up to this point I'd only seen "rotor" used for the
rotor of the generator/magneto, and had been carefully
not using that term for the turbine in my own postings.

It was clear you were not going with that convention,
so I was asking if your usage was common.

Implied questions:

- If using "rotor" for the turbine is uncommon, do we
want to try to reserve it for the genny part to keep
the confusion down?

- If using "rotor" for the turbine is common - elsewhere
if not here - or otherwise proper, do we want to use it
that way more often, so other newbies don't suffer from
the confusion I just experienced?

- Or, what the hell, should we all just do as we please?

Battling entropy for almost 60 years - and losing...
Rod

[ Parent ]

Re: Don't you mean "laminated blades"? (3.00 / 0) (#7)
by daleh007 on Thu Mar 24, 2005 at 03:14:36 AM MST

Points taken. I read quite a few of these posts myself and find that the content is not always what I am after either and quickly move on. Sorry that you had to read the first few words of the post which immediately started talking about wood or that you didn't see in the subtitle reference to grain orientation and figure it out. My point here is that too much time and space is spent on ratholes like this. If the posting isn't what you thought move on. If you have constructive information regarding the post by all means add it. Let's try to stay on topic and provide useful information and I promise not to call blades rotors any more.
Daleh

[ Parent ]

Laminated Rotors | 7 comments (7 topical)

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