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Piggot 8 foot turbine - yaw bearing
By David HK, Section Mechanical Posted on Sun Sep 7th, 2008 at 06:20:52 PM MST
Another concept

I have often wondered why the yaw pivot cosnoists of the beanpole taking the entire weight of the turbine on what is basically a flat piece of metal. Its an accident waiting to happen until the beanpole has worn its way through the cap. I am sure I have read posts on this subject.
To get around this my yaw pivot is a solid block of stainless steel bored out to accept a thrust bearing which should solve the problem.
I hope the following photographs are self explanatory. Please comment as you wish.

David HK

Piggot 8 foot turbine - yaw bearing | 4 comments (4 topical, 0 editorial)

Re: Piggot 8 foot turbine - yaw bearing (3.00 / 0) (#1)
by electronbaby (roy<at>windsine.org) on Sun Sep 7th, 2008 at 12:59:47 PM MST
(User Info) http://www.windsine.org

Yes, it is a concern of many. I guess it is done this way for simplicity, but what you have done will certainly work. It is a possibility that you can now decrease the tail surface area SLIGHTLY. Basically what you have done is decrease the wear and tear on the yaw bushing, while also decreasing the force required to yaw the machine. Pay close attention to what your furling speed is, if you leave all the measurements the same, and use your yaw bearing, it might furl slightly earlier than the plans state.

Just a side note. :-)

Looks good. I have used a stainless lower bushing turned down to fit the ID of the tower stub. On top of this I use a greased teflon bushing. The turbine would sit on the teflon bushing, and although not as refined as a bearing, it will last a VERY long time. There are holes drilled in both the stainless bushing, and the teflon to facilitate the passing of the feed line down through the tower stub as normal.
Have Fun!! RoyR KB2UHF

Re: Piggot 8 foot turbine - yaw bearing (3.00 / 0) (#2)
by Flux on Sun Sep 7th, 2008 at 02:21:12 PM MST
(User Info)

For those with the facilities this is a good idea, it will last longer, it will not in fact work any better and the tail may wag a bit more but it will be fine.

I wouldn't mess with the tail area, you will find that it runs at a fair angle to the wind now and if you reduce tail area it will make it worse.

These machines are kept simple so that the majority can build them without full engineering facilities, you can improve some things if you are better equipped.

Flux

[ Parent ]

Re: Piggot 8 foot turbine - yaw bearing (3.00 / 0) (#3)
by SparWeb (sparweb at ANTISPAM_hotmail_com) on Sun Sep 7th, 2008 at 03:38:34 PM MST
(User Info)

Stainless always makes stuff look nicer doesn't it?
I opted for a yaw bearing, although I just sandwiched a tapered bearing set between the top of the tower tube and the cap of the windmill mount. You've got the grease nipple on it, too, so you're "good to go". How big is the ID of the spigot?
Steven Fahey

Re: Piggot 8 foot turbine - yaw bearing (3.00 / 0) (#4)
by blueyonder (windwoodgood at yahoo dot co dot uk) on Sun Sep 7th, 2008 at 04:07:17 PM MST
(User Info)

hi david your a lucky guy in the fact you can use stainless steel.
what your doing now looks great.
i love to play with s/s. but only use it on my boat.
but saying that i have done sum bits to the stator bracket with 316.

now you said in another post about locking up all the nuts and bolts.
there's not many nuts and bolts on mine. but as yet haven't locked every thing up
yet.
so maybe if i say what i am thinking you might help.
first i am getting ny-loc s/s nuts.
i also have split washers. for locking up.
but i am wondering about serrated washers. all in s/s.
then there is two nuts locked together.
this all concerns the stater mounts .

and also lock-tite . a mild type. i did wonder about super glue as a lock on threads
as you know i have a big big nut on the back of my rotors.
i will make a locking tab for that. i will enjoy that.

now i need to be honest. with most things i just tighten it up as hard
as i can. more concerned with getting it undone later than it coming undone.
if the mill was at ground level i could check on lose bits.
so unless i hear something making a noise like rubbing.
or laying on the ground underneath. or mill not putting out power.
i am going to do my best here. but just what is the best way to hold a fibre
glass stater .
must get sum movement due to heat and cold.
so any tips here will help much. blueyonder.

its a ill wind that dos no good

Piggot 8 foot turbine - yaw bearing | 4 comments (4 topical, 0 editorial)

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