Timeline for Cartoon vs Real Life Bores?---(Pointy vs Flat kind)
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 21, 2019 at 1:04 | vote | accept | John Hon | ||
| Jan 25, 2017 at 12:44 | comment | added | Adwaenyth | On a side node, drill bits have a (slightly) conical shape more to keep the drill centered while drilling. Otherwise it would be rather hard to keep the drill in position when doing it manually. | |
| Jan 25, 2017 at 12:40 | comment | added | Adwaenyth | Also keep in mind pressure is force per area. You can get a much higher pressure when you press a flat borehead against bedrock than with a conical one. So it isn't only the cutting wheel that has to be made sturdy enough but the whole force the boring machine needs to exert on the rock would need to be higher due to the greater total surface area. With a 3:1 ratio for height to radius on the cone in the comic book, the area (and thus the force) would be more than three times greater than that of a flat disk. | |
| Jan 24, 2017 at 19:24 | comment | added | simpleuser | also note that most of the light blue parts on the real machine are replaceable (from inside the machine) and wear out quite regularly. and it runs at about 1/1000 th the speed of the cartoon drill | |
| Jan 24, 2017 at 19:14 | comment | added | kingledion | @JohnHon The pointy tip has less surface area, but to bore a hole of the desired diameter, you need then entire conical section of the cone to come into contact with the rock. In that case, the cone has a much greater surface area than the flat-faced circle. | |
| Jan 24, 2017 at 16:22 | comment | added | Shufflepants | @JohnHon The pointy one sure will have lower surface area when first getting started, but after you've drilled in at least the length of the cone, the entire cone will be in contact with the bore hole walls. | |
| Jan 24, 2017 at 13:32 | comment | added | Catalyst | Threads for fasteners (and leak-tight plumbing) use 'pointy' threads. Drill bits for harder materials tend to be obtuse. Suggest using images.google.com to look at masonry drills. | |
| Jan 24, 2017 at 13:30 | comment | added | John Hon | i do understand ur point but i guess i was thinking about the penertration point (the tip). I guess my logic oculd be a little foul | |
| Jan 24, 2017 at 13:28 | comment | added | Catalyst | Nope, the cone has more surface area. Search for the formulae and you'll see. Intuitively: for every narrow pie slice of the disc (say 1 degree), the corresponding area on the cone is a triangle with the same base, but a much longer height, via Pythagorean Th. Then integrate around the disk (or cone) to get total area. | |
| Jan 24, 2017 at 13:23 | comment | added | John Hon | "minimum area cutting surface is best" but the pointy one has WAYY less surface area right?? | |
| Jan 24, 2017 at 13:19 | history | answered | Catalyst | CC BY-SA 3.0 |