Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [drilling]

38 questions
7
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2 answers

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, which used laser drilling (20 micron holes) for…
Aditya
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6
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2 answers

How to drill larger bore in pipe?

I am trying to bore out a red brass pipe from 3/8" to 10mm using my drill press and a standard twist HSS bit. Running the drill at 600rpm I can't get more than half an inch in before the drill starts binding. I tried running first with cutting…
feetwet
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Can I use a wooden flat screw head with a washer to mimick a pan head screw?

For example - I am installing a fold up table from Ikea, it needs to hang from the wall, as shown below. It explicitly says to use pan head instead of flat screw heads like shown in the picture, I would drill into hollow concrete and will use nylon…
appwizcpl
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4
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1 answer

Why are drill bits always slightly undersized?

I have found that drill bits are always slightly undersized. For example, 10mm bits tend to be more like 9.8mm diameter. And in aluminium, the hole ends up being about 9.9mm. The same seems to be the case for conical stepped drill bits I've found it…
CL22
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4
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2 answers

What diameter hole will a twist drill bit of a given size actually make in a piece of metal?

I have a piston of diameter 0.7 mm exactly and a 0.7 mm drill bit. Let's call the diameter of the piston $r_1$, the diameter of a hole at the end of a tube $r_0$, and the final-actual diameter of the tube hole $r$. Then with fluid being pushed by…
D Left Adjoint to U
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4
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7 answers

How can I cheaply drill a 0.1 mm hole in a small piece of tungsten?

I have a 10 mm diameter rod of 99.5% pure tungsten that I want to drill a 0.1 mm hole in using my Grizzly G0768 lathe. The hole only needs to be between 0.1 mm and 1 mm deep and is for a 3D printer hot nozzle. I don't know if this will break the bit…
D Left Adjoint to U
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4
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Is constant force a useful parameter for correct drilling operation?

I'm trying to figure out a correlation between correct feed rating and the feed force. Can a specific feed force be declared to create the correct feed rate per material per tool speed?
ceremcem
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4
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2 answers

Is my aluminium drill swarf okay?

So I've been drilling standard 1/4" aluminium in a small (250W) consumer drill press. I've used a little oil to help, but I'm not sure if I'm doing it right. The holes seem okay though. They're 10mm diameter. Judging by the swarf coming off the…
Paul Uszak
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2
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1 answer

Meaning of "no mechanical delay required" in packer description (oil drilling)

This description of the Reflex Lite packer by Reactive states the following among its advantages: "No mechanical delay required" What could that mean? The packer has no built-in system of delayed activation or delayed swelling control? Or "there is…
CopperKettle
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2
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1 answer

designing a drill jig for manufacturing a finished product

what will be suitable drill jig for the given product? since the drill is not straight. so i'm not sure for the suitable design, kindly looking for kind help. thanks in advance! if it would have conventional product for drilling three holes, i would…
Satya
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2
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What type of drill bits are these?

https://drive.google.com/file/d/1JPV6dRqB6f__N1eCcmn6QkOStLpVdc-U/view?usp=drivesdk Here's an image for bits Head. https://photos.app.goo.gl/HS8hFqLeWn8jecka7 In the image above (Google Images & Drive) a bunch of drill bits I found in my father's…
Alaaj99
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2
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How do I calculate Pressure drop across relief valve and then force on piston?

So, I'm designing a basic downhole hydraulic tool cutter of an OD = 5 1/2 in., and my tool contains a relief valve and a piston. I am trying to calculate pressure drop across the relief valve so that I can calculate the force on piston that…
Karima Zafar
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2
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2 answers

In rock drilling, how does the drill pipe in horizontal directional drilling withstand the immense force?

Unlike vertical drills where the drill bit is weighted down by gravity, in horizontal drilling, the drill string is pushed into the rocks. How does the drill pipes not snap under the immense force, especially since the pipes can end up being curved?
Michael
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2
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1 answer

End mill vs Drill Bit Flute Geometry

What is the fundamental difference between the flute geometry of an end mill as opposed to a drill bit? Obviously drill bits are not intended to cut horizontally so what difference about them makes them unable to do this efficiently? Also, since…
Scrapper
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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?
user15441
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