# Questions tagged [metalwork]

Questions related to shaping and reshaping of metals or metallic items by processes like shearing, bending, piercing and other metal forming or cutting operations.

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43 views

### Running utilities into bomb shelter / bunker

In peace and disaster time, bomb shelters are utilised for living spaces. Hence, what are some considerations for drilling through the reinforced walls to run utilities such as water, petrol, ...
38 views

### Confusion in deriving von Karman equation for strip rolling

In the derivation for von Karman equation for metal strip rolling, an infinitesimal element is chosen as shown in the picture above. The equilibrium equation for the element is as follows: Upon ...
47 views

### What is the hole tolerance in hand tap guide?

What is the tolerance for through hole to match the UNC 1/4-20 tap ⌀ 6mm? (tap shaft diameter ⌀ = 6mm) I want to make the diameter of the hole such that the tap stands in the hole and doesn't fall ...
92 views

### How to go from a metal sheet to a metal box using (set of) dies only?

As a hobbyist, how to go from a metal sheet to a metal box (1 hollow side) by using (set of) dies only? All videos I watched involved : bending 1 side at 90° then A) cut twice and discard a square ...
1 vote
327 views

### Making hole in 1/8" Lead sheet with minimal dust/debris

I want to cut some 6" diameter holes in 1/8" thick lead sheet that is 12"x12" up to 12" x 24" but would like to minimize dust and debris. I was thinking that the best ...
39 views

### How to CAD: smooth width transition in sheet-metal bends

I am working with FreeCAD 0.20 and Sheet Metal work bench 0.2.63, but universal CAD tips are also welcomed. As shown in the image, I would like to bend sheet metal with smoothly chancing width along ...
48 views

### Fabricating a Strong Hub Shell for a Bicycle

I'd asked this question over at SE Bicycles but they think this is more an engineering question. The flange on my hub broke and I'm having to get one fabricated. The part is actually a cage that ...
29 views

### Fabricating a Strong Hub Shell for a Bicycle

I'd asked this question over at SE Bicycles but they think this is more an engineering question. The flange on my hub broke and I'm having to get one fabricated. The part is actually a cage that ...
69 views

### Making a basic sprung mechanism that can withstand moderate percussive force

I'm making a game where you have to hit targets, kind of like whack-a-mole except the targets aren't actively actuated. I'd still like an element of mechanical "feel" to it, so I'm aiming to ...
36 views

### Method to secure these two parts, with constraints

How should I complete this task? 2 aluminium discs, around 55mm diam x 20mm high. The top disc must; be able to rotate 360deg w.r.t the bottom disc once in desired rotational position, be secured to ...
1 vote
62 views

### What would this fairly bulky machined piece be doing in a missile?

Ria Novosti allegedly posted an image of this fairly bulky 10x10x4 cm (or so) machined piece with a hole in the middle, reportedly part of a Storm Shadow missile that hit Luhansk. I'm wondering ...
1 vote
252 views

### What is the definition of depth of cut in machining?

Calculate the machining time required to reduce the shaft diameter by 6 mm if the maximum depth of cut is 2 mm, and also the parting off (cut off) time for the shaft, knowing that: the shaft diameter =...
129 views

### How can I build propane torch burners that have a custom configuration?

For doing hard soldering I would like to have a propane burner with a custom configuration. The reason for this is that when soldering there is a region that ideally should be heated slowly, ...
878 views

### What is the strongest sheet metal screw for 1/16 inch aluminum sheet?

My objective is to join 1"x1" aluminum tubes (80/20 Quick Frame: https://8020.net/9000.html) with external plates. Trying M5 screws, I discovered that tapping 0.06" aluminum sheet ...
34 views

### Bend a metal strip to a different axis

How can I bend a metal strip (3 inches x 3 feet x 1/32th) in a different axis? I know it would need a few compound bends, but can't figure out the math. Preferably straight vends instead of just ...
20 views

### Cutting method, where shaving stays attached from one side

Usually shaving goes out in front of the tool, being connected only along the cutting tool width. Im interested in another case, when shaving is moved to one side and it stays connected to the ...
122 views

### Are rusty stains allowed to happen with hot dip galvanized steel construction?

I ordered a fence and the provider agreed to deliver it made from hot dip galvanized steel covered with powder painted finishing. The price was significantly bigger thank with the electro ...
236 views

### What material property (Young's modulus, HRC hardness, Max yield strength, etc) affects how easy it is to cut sheet metal?

Our team is looking for sheet metal that is easiest to cut (and paint over), so I was wondering if there was a specific material property (such as those listed in the title) that affected the ...
66 views

### Metal sheet forming - material properties when switching material

What does one have to look out in material properties when changing material grade in cold sheet forming operation (example: from DC04 to DC03 or to DC01). Operation is mostly made of 90°bends and ...
42 views

### Springback in carbon/HSLA steel - cold forming

What are the measurements denoted on top of the YS-t steel lines? Material thickness or bend radius? ...