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Questions tagged [drilling]

40 questions
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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…
Jodes
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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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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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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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Ascertain drill RPM analyzing striations

This question is about core drilling in granite. The pic below shows a granite formation that had core drilling performed on it. Is it possible to ascertain the RPM of the drill that drilled the core in this piece of granite, given the following…
Mars Sojourner
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Inconel drilling with titanium drill bits rpm

I am working on a hobby project and therefore I have to drill a total of 68 holes of 3mm in Inconel 625 plate of 0.4mm thickness. I bought some titanium drill bits: link, but I have trouble to find an appropriate RPM to drill with. Is there a way to…
Bart
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How to drill hole into thin plastic sheet?

Ok, don't know if such simple questions get asked here, but I have a plastic PP container and I'd like to drill a couple of 1/2 inch holes into it, both on the base and the wall. Was wondering how to do it and whether the thin material would be able…
DribbleNibble
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Question about length of commercial augers

I am planning on buying a 16mm auger for a project of mine. I was wondering if the length given (such as 460mm) included the shank and tang or if it just specified how long the business end of the auger was?
Guesty
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Pratt & Whitney lathe drill chuck

I have an old Pratt & Whitney lathe and I need a drill chuck for the spindle sleeve. Does anyone know what kind of cone I need? It's definitely not a morse cone, since I already tested it. Since I can only post two images, here are the dimensions of…
Bernd
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How much would a regular sized oil rig type platform cost to build?

How much would it cost to build an oil rig type platform, that floats like an oil rig, but doesn't have the functions of drilling oil and things like that? Basically what I'm trying to say is, how much would it cost to build a large, floating metal…
Ben
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