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Questions tagged [metals]

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1answer
41 views

Galvanized Steel (Zinc Plated Steel) vs Stainless Steel

Zinc Plating is known for its ability to prevent most corrosion, and it is done by just dipping a metal in hot pool of zinc and letting it cooldown. Meanwhile, stainless steel, an alloy that is ...
4
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2answers
66 views

What grade of titanium are “memory titanium” glasses made of?

I've worked with different grades of titanium. Mostly with grade 5, and also grade 1 which is ductile. I know that some glasses are made of titanium and are called "memory titanium", I guess because ...
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0answers
80 views

With which parameter can you specify whether a metal is ductile or brittle

I have to do a durability approval of feather key (shaft-hub connection) and the formulas are dependent if the shaft respectively the hub is ductile or brittle. But what is the decision about to say ...
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1answer
23 views

What is the most corrosion resistant 55HRC stainless steel?

55 HRC is a very high hardness, even for steels. Ideally the corrosion resistance of the steel would have to match AISI 316L or be even better. Qenched stainless steel can go to 55HRC. Even to 65 ...
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1answer
52 views

How to calculate the bending resistance of a square metal bar?

I have an old bend/twisted wooden door. It has some character to it so I want to keep it and add square metal bars to straighten it. I have provided a sample drawing of the door and where it is ...
3
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1answer
29 views

Can chemical vapor deposition chambers be used to lay down thick layers of metal?

Can CVD Chambers be used to lay down thick (~1 mm) layers of metal?
0
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1answer
66 views

Which materials we can use for storing liquid nitrogen?

What are the materials we can use for the long-term storage of 30~liters of liquid nitrogen with composition and grade, along with the thickness of the sheet and storage capacity? Can we use any ...
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6answers
154 views

How to create an airtight connection between Stainless Steel and PTFE?

I have these two parts shown below, the bottom cylindrical part is stainless steel, the rectangular upper piece is PTFE (Teflon). The SS prongs from the lower part need to insert into the holes of the ...
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2answers
158 views

What's the difference between tempering and aging?

The processes sound really similar; I'm asking with respect to Martensite processing. Essentially the difference between Tempered martensite and Aged martensite for Steels
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1answer
83 views

What is strain hardening exponent?

Hardening leads to a material being more brittle.However I can't understand what is strain hardening or strain hardening exponent.Please explain why hardening leads to brittleness also in this answer ...
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2answers
70 views

38CrNiMoAlA: Does it even exist?

I have some plungers made of 38CrNiMoAlA. Their required hardness to be achieved via quenching/tempering is 51 HRC. I've scoured our technical order for heat treatment of steel alloys but the material ...
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0answers
35 views

Find electronics in wilderness; or, “I dropped my cell phone in the woods!”

Imagine I was working in the woods and dropped my cell phone somewhere in a large area where it is now hidden beneath dense vegetation. By calling it I confirm that either it has powered off or its ...
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1answer
64 views

How Can I do punching of 0.22mm in stainless steel sheet (Sheet thickness 0.5mm)

Wanted to press punching of 0.22mm dia (Bottom) and on (top) 0.6mm dia Please suggest how can I make such die?
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0answers
40 views

Optimal size and shape for a steel target?

Problem I'm building a steel target for long-range rifle shooting. For those unfamiliar, the purpose of the steel is to produce a loud "PING" when the bullet strikes the target. It's very fun. Since ...
3
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3answers
35 views

Support columns inside metal tubing

Does structural metal tubing (e.g., either as HSS, or in space frames, or even motorcycle/bicycle frames) ever come with any small metal rods or columns inside of the tubing itself? While it might ...
2
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1answer
59 views

Coating gold on to sunglasses lenses?

Recently I have been trying to find out more about the process that is used to coat glasses lenses with gold. I asked about it in another forum last night and I was directed here. I initially thought ...
4
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1answer
94 views

Purpose and name of fine pitch marks on a cast metal part

I have seen this kind of mark on various cast metal parts. This is an image of the base casting of a hard disk drive made by HGST. What are these marks for? What are they called?
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2answers
58 views

Which materials can be used to make permanent casting molds for cast iron?

I am interested in comparing the different materials that can be used to make castings of cast irons, and therefore was wondering which material is commonly used/which materials can be used to make ...
2
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1answer
264 views

Sheet Metal Bending: stuck on calculating the minimum radius required

I'm used to calculate the minimum radius required for bending operations on both aluminum and steel sheets, given the following parameters: https://imgur.com/a/7akHC Problem statement: For a sheet ...
1
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1answer
43 views

What considerations should I take when flame-hardening a wheel?

I'm currently trying to figure out whether or not we can flame-harden a steel wheel which was supplied with a lower hardness than expected. I'm worried, however, that flame-hardening can either deform ...
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3answers
53 views

I am looking for some basic mechanical parts to build structures(prototypes)?

I am looking for something like this to make my robot ideas as prototype. But I don't know it's name! Also if there are better options I will happy to know.
0
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1answer
63 views

Can a Plasma Cutter use for melt metals?

Can a Plasma Cutter use for melt metals like Iron, Brass, Stainless Steel ect, ?. Particularly for molding purposes. If can't, is there any other electric item that doesn't use gases (Acetylene, ...
2
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2answers
98 views

Is there a drill adaptor or attachment tool for cut a metal solid cylinder

I need to cut a 7mm solid Aluminium plug (Non-hollow and non-threaded) to replace a part in my car. Is there a simple drill adapter tool to cut a solid metal cylinder (Plug) from an Aluminium mass ? ...
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1answer
30 views

Should we use ELF or ULF for very deep metal detection and which specific frequency?

We are trying to design a metal mineral deposit detection system using low frequency radio waves. I am not sure on the physics of why the ultra low frequency electromagnetic radiation can penetrate ...
2
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1answer
772 views

Is a metal Prince Rupert's drop possible?

Can a Prince Rupert's drop be made of metal instead of glass?
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2answers
253 views

Pouring aluminum into another block of Aluminum

I have a 120mmx120mm brushless fan with an Aluminum frame, which as you can imagine, isn't very thick. I want to thread the base, so I can mount it with a fairly large screw. For that I need to add ...
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0answers
52 views

Can coating tungsten to stop oxidation?

A patent that I read that stated: " Coating tungsten with nickel then with aluminum, will stop oxidation in open air environments. And even pass the melting points of both the tungsten and nickel, ...
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2answers
463 views

What is the proper screwdriver for a M2 counter-sunk hex screw?

I have many M2 flush-mount, counter-sunk hex screws ordered from a variety of sources, including McMaster Carr, Ebay, etc. The Wiha 263 1.5x50 screwdriver I have does not drive any of these properly, ...
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0answers
31 views

Attachable/Removable Table Leg

So I am having a welder make a 24'x48' frame, on the bottom of the frame I would like to have 3'x3' metal plate about .25cm to 1cm thick on each corner to act as areas for legs. If i had him leave it ...
0
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2answers
70 views

Strechable object that can transfer current

Does some material/metal exist that can be stretched and still transfer current? For example: Say I have a rectangular item made of some metal or material(unknown to me at the time). On both ends, I ...
0
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1answer
53 views

How to create intersected conical copper coils?

I'm looking to create something like this: But the problem with solid copper wires is it tends to spring back into it's original shape and this construction will flatten. I've tried creating a ...
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1answer
27 views

Materion Bulk Metalic Glass

Materion sells 4 types of amorphous metal alloys,it cost huge amount of money,1000 dollar per kilogram.My question is,why would anybody choose it over lets say titanium 6al-4v?
0
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1answer
37 views

How is this aluminum heater mounted to the stainless plate?

I'm looking for a way to mount a 1000W electric heater to a stainless base. Electric kettle heaters could fit my requirements, but I'm wondering how the Aluminium heater is mounted to the stainless ...
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2answers
123 views

What is the rated tensile strength of 2000 kcmil stranded copper conductor?

All the documentations I could find goes upto only 1000 kcmil. Please direct to a reference for larger cables. Is there a method to extrapolate from smaller cable sizes?
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1answer
543 views

Hand-pressed metal stamping - fishing spinner blades [closed]

I want to stamp my own fishing spinner blades. They look like this: http://lurepartsonline.com/Online-Store/Colorado-Blades/Premium-Finish-Colorado-Blades.html Specs are usually 1mm thick, 3x2" ...
1
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1answer
84 views

No increase in temperature during bending?

Good day, I am a mechanical engineering student, we conducted three-point bending test for a metal specimen and I am wondering why the temperature of the specimen did not increase as the UTM certainly ...
3
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2answers
3k views

Difference between Precipitation Hardening and Tempered Martensite

The textbook "Materials Science and Engineering An Introduction" mentions that: "Precipitation hardening and the treating of steel to form tempered martensite are totally different phenomena, even ...
0
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1answer
483 views

Chamber Wall Thickness for Liquid Fuel Rocket

In, How to Design, Build, and Test Small Liquid-Fuel Rocket Engines, by Krzycki, page 18 has the following equation: $$t_w = \dfrac{PD}{16000}$$ Assuming the following: Pressure ($P$) in combustion ...
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1answer
149 views

Design a composite material with good wear resistance and electrical conductivity

For a electrical switching device which opens and closes frequently and forcefully. Would a combination of a soft polymer matrix and a conductive metal fibre be a good choice for this? While polymer ...
7
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2answers
674 views

Metal micro perforation

I'm trying to design a metal surface with micro-perforation for a product and light it from other side with LED, such that the perforated pattern appears only when lit. In my previous prototype, ...
3
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1answer
66 views

What paint/spray on material should I use to insulate a metal pole?

I am not entirely sure if this is the correct forum to ask this question so please refer me on if there is a better arena. I am creating a small weather station and I wish to measure soil ...
1
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1answer
911 views

How can I find the amount of force needed to bend and break a magnesium cylinder?

I want to determine how much force in Newtons will be need to bend a solid cylinder of magnesium. The cylinder is (x) cm in diameter, and it is (l) cm long. The density of normal magnesium alloy is ...
8
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1answer
112 views

Material selection for weight scale

I am looking to test the FlexiForce sensor in measure force, however for accurate readings the load needs to be disturbed evenly over the sensing area. As such I am having "discs" made to cover the ...
6
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2answers
3k views

How metal fittings seal connection without rubber gaskets?

I am well familiar with the concept of gasket. From my non-mechanical engineer perspective, I can understand how a standard rubber gasket works in various plumbing ...
8
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1answer
136 views

Weldability of Pure Tin

The site states that Tin cannot be welded, but after I made some research, I discovered that tin, when alloyed with copper or used as a protective coating for steel, can be welded. My question is why ...
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2answers
82 views

Frequency dependence of electromagnetic shield metal

I know that the effectiveness of metals used for electromagnetic shields heavily depends on the used frequency or frequency range. I could not find a resource in the web (tables or graphs) that give ...
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2answers
552 views

How can I finish a round hole so it has 90 degree corners (flat bottom)?

I have a 10 mm depth x 5 cm length 99% Tungsten rod. How can I machine the described hole so that instead of having a bevel from the tip of the main drill-hole bit, it has a perfect 90 degree corner ...
4
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1answer
182 views

How small can you get a stream of molten steel to be at low pressure?

I'm designing a crucible / extruder, and right now it has a .6mm hole to extrude from. Will this work? A chart with various metals listed would be nice. Pictures: Click to expand
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1answer
263 views

How thick does an aluminium vacuum cylinder have to be?

Take a hollow aluminium cylinder with outer radius $r$ and length $h$, capped with two circular endcaps. How thick does the aluminium have to be, that is what is the inner diameter of the cylinder, ...
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1answer
123 views

What is the ideal metal sheet thickness used in a 1 tonne atv/tractor dump trailer?

What would the ideal thickness of the dump trailer bed be, so it can withstand loading rock from a height of 1 meter? The spacing of ribs is yet to be decided. The goal is that the trailer be as ...