First electrical power output from a Pyramid

[skywatcher]

To find center I was thinking of making a small hole in center of plates then using a laser pointer, to shoot through the hole, might be better than rods, we see.

I think the best way to find the center is not fiddling around with rods or laser pointers, but to calculate and measure it.   

The center of the pyramid has to be exactly on the middle axis, so draw the diagonals of the base, and the center is where they intersect each other. So we have the x and y coordinates. For the z coordinate we have to know which kind of center we are looking for. I thought it was clear until i tried to construct it on paper, and also looked at Thomas' sketches.

There are 2 possibilities:

You could take the side planes of the pyramid, which are equal-sides triangles, and construct the middle point of each side plane, which is approx. 29 cm above the base (measured on the plane). When the plane is slanted (mounted on the pyramid) then this point is approx. 23.5 cm above the base plane. When you now construct a line perpendicular to the side plane through this point, it will not even reach the line going from the center of the base upwards to the top of the pyramid.

Thomas has drawn a sketch where he constructed the perpendicular lines from half the height of the pyramid. Then they intersect with the center line, but his sketch is not plausible because he sketched a equal-sides triangle as side-view of the pyramid, which it is not (in the side view the base is 1 m and the two other sides are 0.86 m).

Mounting the converter:

I would suggest not hanging it from the top of the pyramid, but placing it on a stick which is mounted on the base plane.
This gives more flexibility for finding the exact location and orientation (in my opinion).

[Walter Hofmann]

hi skywaker,
I did the construction and the centerline of the side planes and the midle axis intercept exactly at a hight of 180mm from the base.
greetings
walt

To find center I was thinking of making a small hole in center of plates then using a laser pointer, to shoot through the hole, might be better than rods, we see.

I think the best way to find the center is not fiddling around with rods or laser pointers, but to calculate and measure it.   

The center of the pyramid has to be exactly on the middle axis, so draw the diagonals of the base, and the center is where they intersect each other. So we have the x and y coordinates. For the z coordinate we have to know which kind of center we are looking for. I thought it was clear until i tried to construct it on paper, and also looked at Thomas' sketches.

There are 2 possibilities:

You could take the side planes of the pyramid, which are equal-sides triangles, and construct the middle point of each side plane, which is approx. 29 cm above the base (measured on the plane). When the plane is slanted (mounted on the pyramid) then this point is approx. 23.5 cm above the base plane. When you now construct a line perpendicular to the side plane through this point, it will not even reach the line going from the center of the base upwards to the top of the pyramid.

Thomas has drawn a sketch where he constructed the perpendicular lines from half the height of the pyramid. Then they intersect with the center line, but his sketch is not plausible because he sketched a equal-sides triangle as side-view of the pyramid, which it is not (in the side view the base is 1 m and the two other sides are 0.86 m).

Mounting the converter:

I would suggest not hanging it from the top of the pyramid, but placing it on a stick which is mounted on the base plane.
This gives more flexibility for finding the exact location and orientation (in my opinion).

[skywatcher]

I did the construction and the centerline of the side planes and the midle axis intercept exactly at a hight of 180mm from the base.

Yes, this was also my result. But then you didn't use the center points of the side planes, but the middle of the line drawn from the middle of the baseline up to the top. From there, the perpendicular line intersects the center line of the pyramid 180 mm above the base plane.

[skywatcher]

The Air Carbon-Gouging Electrodes are not as rare or unknown in Germany as stated by skywatcher.
Try looking up "Kohleelektrode" in Google!
You can even get them via www.ebay.de (a little bit thick though, item number 120195729622).
Here are only a few examples and links for "Kohlelektrode" which are the same copper coated air carbon-gouging electrodes as stated by Walter Hofmann:

http://www.muehlmeier.de/schweisskat/katalog_039.php

http://www.rehm-schweisstechnik.de/index.php?xC=Kohleelektroden&sessID=39f4a45c89c12b7429808e8177798f17

http://www.produkte24.com/ctp/2813/1/normal/

Greetings, Pontifex

Thanks for the info. 

I have ordered a pack of 50 electrodes (4 mm x 305 mm) which will be more than enough for me so if anybody (in Germany or sorrounding countries) will need carbon rods, maybe i could send him some... i hope i will get the stuff before christmas.   

[vipond50]

Hello Group
Looking at different types of Gypsum board.
Was there a spec. of board thickness or type of board? Considering this
http://www.nationalgypsum.com/products/product8.aspx

It is a 1/4"(6mm+) high flex drywall board for final construction.

Comments?

Thanks
Bill