Questions tagged [cutting]

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1answer
23 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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0answers
30 views

Cutting lego “+” cross-axle holes, lego knobs?

In short, I'm looking for ways to reasonably precisely machine a "+"-axle hole, Lego compatible sockets, Lego compatible knobs, Lego compatible round peg/axle holes, and other cutouts for Lego-...
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1answer
25 views

Laser engravers and focal points

If I understand it correctly in a CO2 laser engraver/cutter the laser itself is fixed in position and mirrors are used to redirect the laser to the material. Is there some mechanism used to keep the ...
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1answer
46 views

How do you determine the apt cutting speed of a hot wire foam cutter?

I am designing an automated hot wire foam cutter for my project, and I am stuck on the computation for the most viable cutting speed of my design. The cutting tool used is a nichrome wire and the ...
3
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1answer
38 views

Speed and Feed values for log slitting of paper

Context: I have a paper roll of about 8 in (20 cm) diameter mounted in a 3 inches core (7.62cm). Its length is about 1.2 m. The paper is bond of 95 g/m2. I have to cut slices of it of about 10-18 cm ...
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1answer
64 views

Flap disc vs sand paper vs grinding disc

Assuming a notional 4.5" disc, on a common 4.5" angle grinder: Which abrasive cuts faster, a flap disc, a sanding disc or a grinding wheel of common grit (I believe 36 or 40)? Assume, at least for ...
4
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4answers
1k views

How should I go about adding holes to laser or water jet cut sheet metal?

I’ve been working on an electric Dirtsurfer project that has many parts to be made from folded sheet aluminium. Obviously the sheet metal needs holes in it for bolts. The sheet aluminium will be ...
9
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2answers
3k views

How can a knife cut through butter?

How does anything actually cut anything, since we all know stuff is made up of atoms and molecules, which can't be touched together (It Requires Binding Energy). So how come we see things all around ...
4
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2answers
111 views

How does water flow in the water jet cutter nozzle?

Here is a schematic cross-section of a water jet cutter nozzle design: As it is shown, the thin water jet grabs abrasive particles in the mixing chamber and the mix flows through the nozzle. My ...
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2answers
81 views

Cutting tool for hollow tubes [closed]

We have steel hollow tubes of 80 mm length and 0.5 mm cross section, that we need to cut in smaller pieces of 10.1 and 10.5 mm length. We have been using utility knifes with very poor results. I am ...
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1answer
42 views

Calculating the angles for gear cutters

I need to design some custom involute gears for a project that I am working on and this is my first dive into gears. I worked out how to calculate the size of gears by the required numbers of teeth ...
2
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1answer
43 views

Gear cutting books in metric system

I am learning about gears, hobs and things of this sort. The main book is the machinist handbook which does a pretty good job of explaining things but things are in imperial scale. This causes me a ...
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2answers
139 views

How to cut Silicone and leave smooth edges?

We've got drawings for a prototype that we're trying to mimic by altering an original mold of the product. For us to mold it would be quite expensive to just test it to see if it works or not. We're ...
3
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2answers
155 views

Why is there no heat-affected zone with water jet cutting?

On Wikipedia it states that the main benefit of a water jet cutter is that there is no heat-affected zone. I am wondering about the physics behind this. I have found experiments supporting this, but ...
2
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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 ? ...
4
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2answers
299 views

Laser Cutting backing material instead of grid?

My research group recently purchased a 40W CO2 laser cutter. We work in the biosensing field and some of the materials we wish to cut are very thin nano/micro fibers that will be cut into relatively ...
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1answer
424 views

Disadvantages of wire cut cnc edm

Before purchasing Wire cut cnc edm I just wants to know about disadvantages of it over using mechanical lathe machine.
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2answers
1k views

Difference between an angle grinder and an abrasive saw

It seems to me that abrasive saw is a term mainly used in the US (the Wikipedia article on it has no links to pages in any other languages), whereas angle grinder has some 20+ translations. So, can ...
2
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2answers
279 views

How to handle reflections when cutting metal with a laser?

I have heard of lasers being used to cut metal, however all laser cutting machines I've found can't cut metal, I'm guessing because it reflects the light? What is different in the designs of such ...
2
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5answers
2k views

How can I cut a thin (1mm) sheet of stainless steel with high precision?

I have a circular puck of stainless steel that is 9.5 mm in diameter. In the center, there is already a 5 um pinhole. My objective is to basically cut the steel along the dotted line, approximately ...
4
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1answer
4k views

Difference between continuous wave laser and a pulsed laser

I understand the difference between the two in terms of how they function; one will release all of it's energy in small pulses with the other creates a constant stream of radiation. My question is ...
3
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5answers
396 views

What would be a practical way for removing thousands of padlocks from valuable bridge railings?

Inspired by this story about Paris authorities ordering removal of thousands of "love lock" padlocks from bridge railings. This is not a DIY SE question because it's not DIY scale in the first place. ...
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2answers
10k views

Force required to crop/cut a mild steel bar

I have cropping/cutting wedges with a thickness of 4 mm cutting either side of a round mild steel bar (17.5 mm). Imagine two wedges being driven together with a round mild steel bar in the middle (...
6
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2answers
207 views

Cutting mechanism for a robot in confined spaces

I'd like to build an exploratory robot that can fit within confined spaces1. As the robot moves along the inside of a 4" pipe, it's likely to encounter some obstacles that need to be removed. ...