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gbwillson

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Reply with quote  #111 
Thanks for testing Bert. It may not be easy or fast, but once you have the timing and recipes for various foods, you can save a little money and a lot of heat from your kitchen.

Greg in MN


Bert

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Reply with quote  #112 
It does save money especially since we have an electric oven.
Made chili in the sun oven today. That takes several hours in the sun oven or the electric stove.

I have to make some improvements on it yet. The center of gravity changes depending on if the reflectors or on or not. This oven is heavy too. Have an idea how to fix that.

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Bert K.
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Bert

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Reply with quote  #113 
I redid the pivot point. Here is the original.

old-pivot.jpg 
I added a T-track.

t-track-oven.jpg 

Now I can balance it out to the best position like this.

new-pivot-on-stand.jpg 

That's a lot of weight on an aluminum T-track and a quarter inch bolt. Would like to upgrade to steel and a larger bolt one day.

It is hard to slide with the weight but at least I could dial in the position I wanted. It beats taking off the old pivot which includes two 3/4 boards and drilling new holes for the bolt. Put it all back on hoping it's in the right position.

Now it's much easier to adjust the angle throughout the day. Before I could barely lift it.



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Bert K.
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gbwillson

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Reply with quote  #114 
How smoothly does it pivot and rotate? I'm wondering if this would be a good project for an automated sun tracker. It would be a heck of a lot easier than a large solar heater!

Greg in MN
Bert

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Reply with quote  #115 
It pivots pretty smoothly now. It rotates easy enough but not as smooth. The big bearings I used seem strong but are a bit rough with movement.
Of course this oven weighs a ton.



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Bert K.
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gbwillson

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Reply with quote  #116 
Could ball bearing drawer glides be used for a smother rotation?
Bert

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Reply with quote  #117 
Do you mean like drawer guides? Heavy duty ones may work like the T track for initial balance point but would have to figure to attached everything and lock it into place once it's set.
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Bert K.
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gbwillson

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Reply with quote  #118 
Yes, drawer guides. Maybe some sort of locking pins could hold the unit in place. Even a clamp of some sort could be used. 


stmbtwle

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Reply with quote  #119 
Just a thought, suppose you fixed the position of the oven and made the reflectors moveable?
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gbwillson

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Reply with quote  #120 
I'm sure this has been thought of, but what if the top AND sides were clear? While you might lose the use of reflectors, the simplicity and the fact that there are no settings or angles needed might well offset any directed solar loss. You could also start warming very early in the day, as soon as the sun hits the cooker.

Greg in MN
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