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Old 05-30-2020, 03:28 PM
crystallographic crystallographic is offline
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Default Geometry - Sphere, Spheroid, Hemisphere

Making a sphere is all about making two half-spheres or hemispheres.
Cutting out the circular disc and hammering more in the center and then hammering more gradually out to the edge – but NOT hitting the edge – is the basic exercise to accomplish this shape.


P1110754 copy.jpg

This is student work from one of our metalworking trainings/workshops. (3003, annealed.)



P1110753 copy.jpg
This is a prototype lighting piece, made from a laser-cut blank. (6061 T6)


Then you only have to make a second half to match the first, and there – you have it!
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Again, student work from one of our trainings. (2024-0)


Aside from being a practical skill, making a sphere was used as a test for craftsmen to get hired into the metal shop at a very well-known carrozzeria, or auto coach builder, “Carrozzeria Touring” of Milano, Italy.


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They would take the aspiring workman out to the shop, show him a bench and a set of tools and the metal. If he succeeded he went back to the front office. If not, he left by the back door.


(Aside:

When I was a young pup metal-boy I would sit with the old craftsmen at lunch and-or coffee breaks each day and listen to their chat, stories, events. Our crew was 35 full-time guys, so there was a lot to catch up on. One favorite of mine was the brass one-piece hollow ball, 1914, for the Ahrens Fox fire engines. Everybody talked about that over the years. No one ever saw one or heard of anyone making one after the old man died in 1915. And he had apprentices that he taught all the metal work to, but never that ball. He took his method with him.)
P1110760 copy.jpg
After thinking for a few years and then visualizing different approaches some more, this one came up. The weld is only a 180 and in the photo comes over the top and down to the center.



I am no expert on this and have nothing more to add.


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Old 05-30-2020, 04:56 PM
Jaroslav Jaroslav is offline
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One favorite of mine was the brass one-piece hollow ball, 1914, for the Ahrens Fox fire engines. Everybody talked about that over the years. No one ever saw one or heard of anyone making one after the old man died in 1915. And he had apprentices that he taught all the metal work to, but never that ball. He took his method with him.)


Kent 35 experienced men. This is a good school. I had something similar in machining.
Although not everything was a good example to follow.

I tested a 1mm steel ball on an Eckold 400mm ? The ball is beautifully shaped to 2/3.
One-piece sphere .... I think know (I remotely suspect) the method. And you must need long time. But it is mastery and great patience. It is a pity that that knowledge is not passed on. In hell, knowledge is useless from all persons.
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Old 05-31-2020, 04:55 PM
crystallographic crystallographic is offline
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Default Carrozzeria Touring - additions

Quote:
Originally Posted by Jaroslav View Post

snip
.... In hell, knowledge is useless from all persons.

Very true, Jaro.


And there is no purpose for some articles, no usefulness, wastes of space.


...... Yet, if there is empty time ... ( )

... a) and the shop is clean ....

b) the wind is too high to throw rocks ...

c) too wet to plow ....

d) all drills are sharp ....

e) and ... perhaps something interesting can be learned -
Then, might as well give it a try.



More via Touring Carrozzeria:


sut1491_Anderloni_ copy.jpg
This is the son of the man who started Touring Superleggera, Mr. Anderloni.
(He is sitting in one of two Pegaso race cars, and the only surviving one. It is a variant of the Z-102B, but with supercharger. Body is aluminum.

(I was booked to do the body resto, but turned it down - too much work booked at that time + customer wanted to micro-manage contours-to-photos. No time to enhance his elucidation and also to perform the exacting tasks. Was on my "10 to do" list, after a 2900B or C. )


P1110776 c.jpg
For those building their own aluminum sports/race car bodies, here is a practical example of how the body covers the chassis and is supported by that chassis. (Alfa 2900C, supercharged 2.9 DOHC inline 8.)
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Old 06-01-2020, 01:34 AM
Jaroslav Jaroslav is offline
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Kent.

(and ... perhaps something interesting can be learned -
Then, might as well give it a try.)


I have a feeling that for the last 2 years I have been only testing. I don't see the end of those discovery paths.

My remark was that it is sad that secrets are not passed on in time. I think everyone has a duty to pass on their secrets. If he takes his secrets to hell, he should get punished there.

Many experts do not want give advice to stay the only ones who know.

But it is true that sometimes you want to give want advice and no one listens to you ..... Ok 50:50

I see in that car without a body a huge benzin tank.
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Old 06-01-2020, 03:01 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Jaroslav View Post
Kent.

(and ... perhaps something interesting can be learned -
Then, might as well give it a try.)


I have a feeling that for the last 2 years I have been only testing. I don't see the end of those discovery paths.

My remark was that it is sad that secrets are not passed on in time. I think everyone has a duty to pass on their secrets. If he takes his secrets to hell, he should get punished there.

Many experts do not want give advice to stay the only ones who know.

But it is true that sometimes you want to give want advice and no one listens to you ..... Ok 50:50

I see in that car without a body a huge benzin tank.

Like yourself, Jaro, I have received the benefit of help from the old senior craftsmen.
And to pay that back I have taught metalworking since 1994, teaching many each year. And some have become very good.
If we do our best then no good deed goes unpunished.


The long distance road race cars always had the big fuel tanks, even back in the PreWW2 years. This Alfa is similar to the Porsche T64 cars: slippery bodywork and lots of fuel for the Rome-Berlin open road runs across the mountains.
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Old 06-01-2020, 03:55 PM
Jaroslav Jaroslav is offline
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I pass on some ideas and consult some procedures. I know I can't take it with me. It is a damage to energy that is not transferred.

"If we do our best then no good deed goes unpunished."

I would not agree here. I have a negative experience. But in a positive attitude, it does not disturb me.


That tank. I am hearing gas splashing in the curves on the way to Rome in that giant tank .....
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Old 06-01-2020, 05:00 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by Jaroslav View Post
That tank. I am hearing gas splashing in the curves on the way to Rome in that giant tank .....

Baffles that limit sloshing are included inside, like this later 40gallon aluminum model:
W006 copy.jpg

W010 copy.jpg
W0727 copy.jpg
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Old 06-01-2020, 06:30 PM
Jaroslav Jaroslav is offline
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Kent. Beautiful work. What material is used as a seal under the rivets - sheet metal bends?
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Old 06-02-2020, 05:25 AM
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That tank is a work of art!
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  #10  
Old 06-02-2020, 09:50 AM
eaglefordracer eaglefordracer is offline
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Default Fountain

I built this a few years ago...not out of one piece though...
it's a fountain with pump in lower tank. Capillary action keeps water on surface of sphereoid...




2015-05-17 18.30.28.jpg

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2015-05-25 18.03.19.jpg
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