bevel (or polished section)
Explanation:
Anschliff and anschleifen is quite far away from "whet", "to whet" (wetzen), or from "polishing" as Leo pretends. It means tro chamfer or to bevel or to start cutting.
polished section der Anschliff
http://dict.leo.org/ende?lp=ende&lang=de&searchLoc=0&cmpType...
tech. V-bevel [med. cannulae] Fünfflächen-Anschliff {m} [med. Kanülen]
http://www.dict.cc/?s=anschliff
In fact the bit has bevelled sufaces, while the "Zapfen" (pin, shank, cone) is polished (not bevelled with bits, but with other tools).
As I am not sure, which part of the bit is "angeschliffen", I offer both possibilities to translate. It's up to you to elect (or to provide more details).
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Note added at 1 hr (2012-06-20 07:13:13 GMT)
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The following Wikipedia article shows diffents shapes for bits:
Unter einem Bit als Werkzeug versteht man eine kurze, auswechselbare Schraubendreherklinge ohne Griff für ein bestimmtes Schraubenkopfprofil (siehe links). Die meist sechseckige Aufnahme ist so geformt, dass man es in einen entsprechend genormten Bithalter einsetzen kann.
http://de.wikipedia.org/wiki/Bit_(Werkzeug).
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Note added at 1 hr (2012-06-20 07:31:49 GMT)
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see also
http://en.wikipedia.org/wiki/Torx
(Unfortunately no detailed description)
Some bit types can be found on this page:
http://www.boschtools.com/Products/accessories/Pages/BoschPr...
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Note added at 4 hrs (2012-06-20 10:32:51 GMT)
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From the pictures I learned that we do not deal with scrwedriver bits, but with drill bits:
Drill bits are cutting tools used to create cylindrical holes, almost always of circular cross-section. Bits are held in a tool called a drill, which rotates them and provides torque and axial force to create the hole. Specialized bits are also available for non-cylindrical-shaped holes.
The shank is the part of the drill bit grasped by the chuck of a drill. The cutting edges of the drill bit are at one end, and the shank is at the other
:
Center drill bits are used in metalworking to provide a starting hole for a larger-sized drill bit or to make a conical indentation in the end of a workpiece in which to mount a lathe center. In either use, the name seems appropriate, as the bit is either establishing the center of a hole or making a conical hole for a lathe center. However, the true purpose of a center drill bit is the latter task, while the former task is best done with a spotting drill bit (as explained in detail below).
:
http://en.wikipedia.org/wiki/Drill_bit
So my first approach is "center" for "Zapfen".
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Note added at 5 hrs (2012-06-20 11:33:13 GMT)
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Now I want you to learn another aspect of tool grinding. It's important to know when you have ground the surface up to the cutting edge, especially when resharpening lathe tools.
http://www.sherline.com/grinding.htm
Double bevel or compound bevel—A back bevel, similar to a sabre or flat grind, is put on the blade behind the edge bevel (the bevel which is the foremost cutting surface). This back bevel keeps the section of blade behind the edge thinner which improves cutting ability. Being less acute at the edge than a single bevel, sharpness is sacrificed for resilience: such a grind is much less prone to chipping or rolling than a single bevel blade. In practice, double bevels are common in a variety of edge angles and back bevel angles, and Western kitchen knives generally have a double bevel, with an edge angle of 20–22° (included angle of 40–44°).
http://en.wikipedia.org/wiki/Grind
1 Grind off the dull tip of the drill in order to grind a new edge on it. Using a bench grinder, push the tip of the drill into a diamond wheel until the tip is completely flat. This will allow you to put a new edge on the drill for use in a manual mill or CNC machine. You can also use a cut-off saw to remove the end of the drill.
2 Turn the drill 45 degrees while also tipping it 45 degrees downward toward the floor. You need to create the relief, which is the area just behind the tip; it supports the edge while cutting the material and will cause excessive loads on the drill while cutting. Removing the relief is the most important aspect of grinding a drill edge.
3 Push the drill into the grinder with moderate force while sweeping the drill upwards away from the grinder but only grind the side you are working on. Make sure you only grind half the drill as you need a defined point on the end for the drill to cut material at its center.
4 Hold the drill horizontal to put the cutting edge on this side of the drill. Keep it turned at the same 45 degree angle to follow the new edge but make sure the drill is no longer pointed downwards. Push moderately until a knife edge is created.
5 Turn the drill 90 degrees from the angle you are holding it at and grind the other side of the drill in the same way you ground the first side, making sure to remove the material behind the edge you will soon create. The process should create a center point for the drill to center-cut naturally.
6 Repeat step 4 for the other side to complete the drill grinding process. You can also use a grinding wheel on a stand-up grinder rather than a bench grinder.
http://www.ehow.com/how_5651924_grind-drill-bit.html
Grinding of an end mill tip is shown on
http://www.youtube.com/watch?v=Dv_uxAsvxOI
The following instruction for a grinding machine explains the drill bit terminology: shank, flute, pióint angle, cutting edge or lip, chisel edge, web and relief.
http://cdn0.grizzly.com/manuals/g0686_m.pdf
So I will still go with bevelled center (faces).
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Note added at 10 hrs (2012-06-20 16:02:17 GMT)
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What is a Four-facet point?
4-Facet Point
(2012-08-16) Typically the optimal clearance angle are set accoding for you to every different drilling requirement to 7, 9, 11, or 14 degrees. 4.-facet point brings all the matter to a new chisel edge that won't walk and bores round, right away holes equipped with shut tolerances.
:
The two bit higher as compared with 1/8-inch consists of a patented Pilot Point Tip to prevent walking intended for improved accuracy and better finished products. Black friday drill bit sharpener sales online. Pilot Point starts along contact.
http://www.drillbitsharpening.info/drill-doctor-da02105pf-le...
Note: The foto shows cutting edge and chisel edge of a standard drill without any pilot point. Each of the 4 facets is located in one of four quadrants. On the other hand, such surface can be called "facet", too.
facet ground [tech.] der Flächenanschliff [Werkzeuge]
ground facet angeschliffene Fläche
surface burnishing facet [tech.] die Facette http://dict.leo.org/ende?lp=ende&lang=de&searchLoc=0&cmpType...
The term "pilot point tip" (2nd. approach) should work better for "Zapfen" (My 1st approach was center).
Pilot Point® Tip starts on contact for clean, accurate holes and reduces lock-up on breakthrough
http://www.faucetuniverse.com/drill-bits/dewalt-dw1169-pilot...
Multi-facet point drill bits.
Super self-centering ability
Due to its very short chisel edge, Multi-facet point has quite small "drill walk", therefore, the accuracy of the hole location is better than traditional twist drills. In drilling a surface with a incline angle of 10 degree, it could still cut.
http://www.weiku.com/products/2479068/Multi_face_Point_Drill...
Note: As shown the term does not depend on the number of facets.
I had some Pilot Point (Black & Decker/DeWalt) drill bits years ago but these became unavailable for some reason and I now have none left. I would like to get some now as I thought they were a much better drill bit than the standard type. I'd be interested in others opinions on this type of drill bit and also some advice on how to go about resharpening them.
:
The small diameter (pilot) can be sharpened in the normal manner. The large diameter (step) requires some expertise with an endmill/cutter grinder I would think
:
I'm not too sure that the term "pilot point" is one that is still used today. However it does bring to mind two types of drills. A multidiameter drill, also known as a subland or step drill (not the sheet metal kind), is used for countersinking screws and/or chamfering but not for through drilling.
Then there is the center drill which has what looks like a short pilot that is used for making a center hole or for starting a regular drill.
http://www.chaski.com/homemachinist/viewtopic.php?f=4&t=7516...
Conclusion: The pilot point is sometimes called "center pin". Its facets can be reground by experienced operators as well as the cutting edge.
The phrase "Anschliff des Zapfens: 4-Flächen Anschliff" may be translated as follows:
"Grinding of center pin face(t)s: 4-facets ground, Incline angle 10° ±2°"
or
"Grinding of pilot point pin face(t)s: 4-facets ground", Relief angle 10° ±2°"
| Johannes Gleim
Local time: 15:35
Specializes in field
Native speaker of: German
PRO pts in category: 205
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peer agreement (net): +1
