sheet metal

Which is the most frequently failed ';sheet-metal'; part in the car?

Do you mean rusting through? Front and rear fenders right behind the wheels.

These areas tend to hold moist salty dirt from the road and receive a constant sandblasting from the wheels.

The same for the bottoms of doors and tailgates, the drain holes get clogged and moisture stays in there and works 24/7 rusting the metal.

Rear bumper covers tend to hold dirt and salt in them and rust the metal underneath.Which is the most frequently failed ';sheet-metal'; part in the car?
You'll have to be much more specific as to area and what you mean by a failure. If you're talking about rust floorboards, cab corners, wheel wells, and any other place where gunk sprays up and can't easily get out of.Which is the most frequently failed ';sheet-metal'; part in the car?
i would say the floor board because it gets the most water from your shoes. water on the outside can run off but the floor, it stays there.
That darn heat shield on the exhaust (iff that counts)

sell makeup

How to calculate required force, to achieve secondary (open type) hemming operation (in sheet metal Indus.)?

Usualy Hemming operation is done in two stages on press brake.

1) 30 Degree Bend (Primary Hemming = Flanging)

2) Hemming Itself (secondary Hemming.)How to calculate required force, to achieve secondary (open type) hemming operation (in sheet metal Indus.)?
There are some charts on:

http://www.krausco.biz/tonagechart.html

which give a tonnage based on several factors. Once you have a method for actually calculating, you could check your answer against this site:

exerpt:

';RULE OF THUMB formula for making multiple bends on a press brake. For shape shown, in mild steel with radii equal to metal thickness unless otherwise noted.

Multiply Metal Thickness by factor = Tons per Foot

Example for bottom bending

16ga (.062) Mild Steel. .062 x 150 = 9.3 tons per foot.';

Hope this helps!

Hi i'm looking for sheet metal duct work jobs in montreal canada?

Ha! This is what my husband from South Florida did his whole life in Broward County, married me from Montreal, and we eventually came to Montreal to live. What is most important here, is that you can work legally. I don't know your situation, but once that is established, you need to apply to air conditioning companies. Look for work, meaning all sorts of sites on the web and the yellow pages in Montreal. Call the a/c companies and ask to speak to the boss. Everything on large construction sites are unionized, this is not the best time for construction but there is still commercial and residential going up. just not as much as previous times. My husband found work. Good luck.Hi i'm looking for sheet metal duct work jobs in montreal canada?
http://www.workopolis.ca

http://www.monster.ca

With regards to the rolling direction, which gives the strongest strength to sheet metal?

Rolling perpendicular to the direction of grain.

An 800 cubic meter cylindrical container made of sheet metal, including top and bottom is to be designed.?

What dimensions for h(height) and r (radius) will use the least material? Use calculus methodAn 800 cubic meter cylindrical container made of sheet metal, including top and bottom is to be designed.?
The top and bottom each use 蟺 * r^2 of material

The cylindrical portion uses 2 * 蟺 * r * h of material

Together,

A = 2 * 蟺 * r^2 + 2 * 蟺 * r * h of material

Also,

800 = 蟺 * r^2 * h

h = 800 / (蟺 * r^2)

A = 2 * 蟺 * r^2 + 2 * 蟺 * r * 800 / (蟺 * r^2)

A = 2 * 蟺 * r^2 + 1600 / r

Take the first derivative of A:

A' = 4 * 蟺 * r - 1600 / r^2 = 0

0 = 蟺 * r - 400 / r^2

0 = 蟺 * r^3 - 400

400/蟺 = r^3

r = cube root(400/蟺)

How do you determine the surface roughness on sheet metal?

Yes a surface profilometer is one instrument for measuring roughness. It also depends on how rough is rough. If you are dealing with very smooth surfaces (like Si wafers used to make computer chips), you need instruments that are much more sensitive than a typical profilometer. If you are dealing with very rough surfaces for example %26gt;700 microinch Ra roughness, (like very coarse sand paper, 60 or 80 grit), you need a profilometer rated for very rough surfaces.

hope this helpsHow do you determine the surface roughness on sheet metal?
By use of a surface roughness measuring machine or by use of a comparator. The machine can give you values for Ra, Rz etc. The comparator will have several sample surfaces of varying roughness and you have to decide by touch and sight where the surface you are interested in falls.How do you determine the surface roughness on sheet metal?
? I guess you can feel it. What are you trying to do, paint it? Fresh sheet metal is not rough at all. It's very smooth.

Can u make a sub box for a car out of sheet metal?

or does a box just have to be wood because the wood conveys the sound betterCan u make a sub box for a car out of sheet metal?
I don't mean to sound like a dick when I say this but they way you asked the question the simple answer is yes. You can do what ever you want if you really want to. Is it advisable? That all depends as well.

The tricky thing about metal is that it produces resonance because it is going to be so thin. Think of those cars that have all those speakers in the trunk and it sounds like they have tin cans rattling in their trunk everytime the bass hits.

You could make a box out of metal but you would need to do everything you could in order to make the box as solid and resonance free (viboration free) as possible.

If you are set on building a metal boxyou need to do whatever you can do dampen the interior of the box to reduce the reflecting frequencies of the bass.

I would highly suggest that you make the box a sealed enclosure.

If they can make boxes out of concrete they can make boxes out of ';pretty much'; anything. As I said before. Every material has a different resonant frequency so the material of the box can play a role in the output of your sub.

If you were to use 1/2'; thick metal and weld all of the pieces together compared to using 1/16'; sheet metal you would be able to tell a major difference.

Honestly, I think it would be more effort that it is worth...

Post up some pictures if you decide to do it anyway....Can u make a sub box for a car out of sheet metal?
Here you go, full on tips and tricks to enclosure construction and other stuff http://spkrbox1.spaces.live.com

The metal will be too heavy and make too much noise.
make it out of wood. if it the look your going for make the box out of wood and put some sheetmetal on the outside.
Make a flat pattern allowing at least one and one half the thickness if the metal for the bends, preferably more.

When you get your pattern done it should allow one to bend

all sides so the the finished produce can be sealed at the corners.

You have to line the interior with foam and egg cartons.

Bass has to be in compression or the speaker blows out.

Also the bass energy need to be reflected of a vertical surface

that can handle the sound energy without vibrating to much.

there should be a 10 to 15 degree angle for reflection of the sound.

Use Gorrilla tape if you cannot afford to have housing welded.
Teh acoustics would be horrible. I would look to cover a wood one made of MDF with sheet metal if you wanted that look.
No to the sheet metal. Use wood or ultra thick plexi-glass. The sound will be alot better.
Yes you can!!! BUT- it will take proper tools,and you will need to protect the contacts from hitting the metal. The box will work, but will produce a hollow, tinny effect (not good) A way around this is to line the metal with carpet or rubber,or even fiberglass insulation......

It sounds easier and simpler to use wood, but I think outside the box too!!! You can make it work, and besides--how many ppl can claim they have a meal sub enclosure???

ALSO--USE RUBBER WASHERS AT SCREWHOLES TO DAMPEN THE SHOCK BETWEEN THE FRONT SIDE OF THE SPEAKER AND THE CONTACT POINTS ON THE METAL

Good luck to ya!!!
I think you can.