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Questions tagged [metals]

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Will expanding metal disrupt my motion sensor?

I am trying to install a door motion sensor in a environment that will get very hot for our work. So the door could heat up to temperature of 150-200°F. We built the frames and door to handle the ...
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1answer
22 views

what design features allow a milling machine to withstand lateral pressures against the bit

I need to cut a slot 4mm wide by 25mm long in aluminum tube with a 2.2mm wall thickness and a 35mm O.D. The tube is 250mm in length. It seemed a drill press with a fluting bit might suffice for this ...
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1answer
22 views

Effect of annealing on the defects

What is the effect of annealing on the defects present in the sample? Does it remove defects in the sample? Is there any chance that due to annealing the point defects present in the sample combine to ...
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2answers
27 views

Mounting an antenna base on a roof using only double sided tape?

I want to put a vertical antenna on top of my roof. The antenna is basically 4 meters of PVC pipe and 5 meters of 19mm aluminium tubing. The roof at my house is corrugated sheet metal, and I want to ...
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1answer
29 views

Creep behavior in metals

If creep behavior can begin at 0.6T(melting) but, hot working for a pure metal starts at 0.4Tm, what is the explanation for this?
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1answer
53 views

What mechanism is available to rotate a metal piece on another metal piece?

I am trying to find some type of mechanism where I can have a smooth but not too stiff rotation between two metal pieces. I was thinking of putting a shoulder screw through the pieces (the pieces will ...
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0answers
27 views

How to produce aluminium powder by E. J. Hall method

I have watched videos on YouTube producing Aluminum powder by mechanical methods. Like this one. It uses Aluminum foil and coffee grinder: There are similar videos which use the same basic method but ...
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1answer
63 views

Arc-welding 2mm thick steel at an angle without burning-through

I'm learning a bit of stick welding since I keep needing it for certain projects. Total beginner. The latest thing I decided to make is a table similar to this one: The material is 2mm thick ...
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0answers
30 views

Factors for Rope Elasticity

What factors, given the same material, change the elasticity of a rope? For instance, nylon rope can be configured to stretch elastically anywhere between 5% and 30% under a specific load. This is ...
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0answers
21 views

Steel Worm/Steel Wheel vs Steel Worm/Bronze Wheel

I have a question regarding worm drives, specifically double-enveloping types: Do steel worm/steel wheel combinations last longer than steel worm/bronze wheel or steel worm/brass wheel combinations? ...
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1answer
71 views

What are these metal cylinders often found in the streets of London?

I often find these metal cylinders in the streets of London: a silver-colored tube with a sphere tapering at one end and a hole with no thread at the other. What are they?
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2answers
44 views

Best way to dent a pipe from the inside?

I am currently trying to redesign a pipe with 2 dents from the inside. What is the best way to manufacture something like this, also how would i go about describing this process in a drawing? In the ...
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1answer
41 views

What's the best material to use for my project

I need to get a piece of stiff material cut and drilled for a project I'm working on. It has the following requirements: 1.6mm thick should be stiff (similar to PCB material, aluminum, fiberglass) ...
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2answers
109 views

Why not build container ships from plastic?

This may sound crazy but bear with me. I was thinking about why cargo ships are built from such heavy material as steel, while smaller boats are often made of plastics. I know cargo ships carry a lot ...
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2answers
81 views

What metal thickness and/or type is needed to support 100kg load?

I'm making a prototype that will have some load cells mounted approximately where the arrows are pointed in the image. The prototype will hold up to 100kg of load/force in the marked location thus I ...
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0answers
45 views

Calculating diameter of steel rod required to not bend over a given length

I want to use steel (or other material) rods to support weight over a 900mm cavity. The weight that needs to be supported is technically unknown, but I'd specify some rough guidelines as: 100KG (max) ...
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2answers
93 views

How to increase maximum rotational speed limit of a reduction gearbox?

Reduction gearboxes made of machine steel gear have a maximum limit to prevent changing their physical properties (softening). They change their properties as a result of the temperature increase ...
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1answer
33 views

Glue metal bolt to nylon hole [closed]

What type of glue is best used to glue stainless steel bolt (not screw) used as self tapping to a hole (no thread) in a 3d printed nylon (polyamide) part? It will be an M2 metric bolt.
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1answer
414 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 ...
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2answers
92 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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1answer
138 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
141 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
112 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 ...
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1answer
36 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?
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1answer
110 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
428 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
966 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
368 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
93 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
39 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
88 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
63 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 ...
2
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3answers
56 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
63 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 ...
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1answer
114 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
108 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 ...
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1answer
1k 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 ...
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1answer
47 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
119 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.
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1answer
227 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, ...
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2answers
107 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
57 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 ...
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1answer
1k 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
655 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
80 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
1k 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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2answers
73 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 ...
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1answer
79 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
29 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?
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1answer
52 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 ...