DE467078C - Tester for twist drills - Google Patents

Tester for twist drills

Info

Publication number
DE467078C
DE467078C DEB130290D DEB0130290D DE467078C DE 467078 C DE467078 C DE 467078C DE B130290 D DEB130290 D DE B130290D DE B0130290 D DEB0130290 D DE B0130290D DE 467078 C DE467078 C DE 467078C
Authority
DE
Germany
Prior art keywords
prism
tester
twist drills
drill
twist drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEB130290D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JOSEPH BAAKES
Original Assignee
JOSEPH BAAKES
Publication date
Priority to DEB130290D priority Critical patent/DE467078C/en
Application granted granted Critical
Publication of DE467078C publication Critical patent/DE467078C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/09—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool
    • B23Q17/0904—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool before or after machining
    • B23Q17/0919—Arrangements for measuring or adjusting cutting-tool geometry in presetting devices
    • B23Q17/0938—Cutting angles of drills

Description

Um mit einem Spiralbohrer ein dem Nenndurchmesser des Spiralbohrers entsprechend großes Loch zu bohren, ist es erforderlich, daß die Querschneide c des Spiralbohrers, die durch die Schneidlippen b, b begrenzt wird, durch die Achse des Bohrers läuft (Abb. ι und 2). Ferner muß, damit ein Spiralbohrer die wirtschaftlich größte Leistung erzielt, die Zerspannungsarbeit gleichmäßig auf beide Schneidlippen b, b verteilt werden, d. h. es müssen die Winkel α, α, welche die Schneidlippen b, b mit der Bohrerachse bilden, gleich groß sein. Aus dieser Forderung folgt, daß die Schneidlippen b, b gleich lang sein müssen. Die Winkel α, α werden beim Schleifen des Spiralbohrers auf der Spiralbohrerschleifmaschine gleich groß, jedoch ist nicht die Mittellage der Querschneide c gewährleistet und somit auch nicht die gleiche Länge der Schneidlippen b, b. In order to drill a hole corresponding to the nominal diameter of the twist drill with a twist drill, it is necessary that the cutting edge c of the twist drill, which is delimited by the cutting lips b, b , runs through the axis of the drill (Fig. Ι and 2). Furthermore, so that a twist drill achieves the greatest economic performance, the machining work must be evenly distributed over both cutting lips b, b , ie the angles α, α which the cutting lips b, b form with the drill axis must be the same. It follows from this requirement that the cutting lips b, b must be of the same length. The angles α, α become the same when grinding the twist drill on the twist drill grinding machine, but the central position of the cross cutting edge c is not guaranteed and thus the same length of the cutting lips b, b is not guaranteed.

Gegenstand der Erfindung ist ein Prüfgerät, das im Vergleich zu den bekannten Einrichtungen den Vorzug einfacher Bauart mit großer Meßgenauigkeit verbindet. Ferner kann die Fehlergröße unmittelbar abgelesen werden, und das Prüfgerät ist zur Handhabung durch ungelernte Arbeiter geeignet.The invention relates to a test device, which compared to the known Facilities combine the advantage of a simple design with great measurement accuracy. Further the size of the defect can be read off immediately, and the test device is ready for use suitable by unskilled workers.

Die Abb. 3 und 4 veranschaulichen eine Ausführungsform des Prüfgerätes gemäß der Erfindung.FIGS. 3 and 4 illustrate an embodiment of the test device according to FIG Invention.

Ein offenes Prisma 1, das zweckmäßig mindestens die Länge der Spiralsteigung des zu prüfenden Spiralbohrers hat, trägt an einer Stirnwand zwei Meßkörper 2, 3, die rechts und links von der vertikalen Mittelebene α, α des Prismas gleich weit entfernt sind. Der Meßkörper 3, der in Richtung der Prismenlängsachse verschiebbar ist, kann mit einer Maßteilung oder Meßuhr 4 versehen werden. Die Verschiebung des Meßkörpers 3 in Richtung der Prismenlängsachse ist durch einen festen Anschlag 5 begrenzt und erfolgt gegen Federdruck. Der zu prüfende Spiralbohrer wird in das Prisma 1 gelegt und mit den Schneidlippen b, b an die Meßkörper 2, 3 herangeschoben, wobei der bewegliche Meßkörper 3 axial vorgeschoben wird, so daß eine ungleiche Lage der beiden Schneiden b, b bei falschem Schliff des Bohrers an der Maßteilung oder Meßuhr abgelesen werden kann.An open prism 1, which expediently has at least the length of the spiral pitch of the twist drill to be tested, has two measuring bodies 2, 3 on one end wall, which are equidistant to the right and left of the vertical center plane α, α of the prism. The measuring body 3, which can be displaced in the direction of the longitudinal axis of the prism, can be provided with a graduation or a dial gauge 4. The displacement of the measuring body 3 in the direction of the prism longitudinal axis is limited by a fixed stop 5 and takes place against spring pressure. The twist drill to be tested is placed in the prism 1 and pushed with the cutting lips b, b against the measuring body 2, 3, the movable measuring body 3 being advanced axially, so that an unequal position of the two cutting edges b, b in the case of an incorrect grinding of the drill can be read on the graduation or dial gauge.

Claims (1)

Patentanspruch:Claim: Prüfgerät für Spiralbohrer, dadurch gekennzeichnet, daß an der Innenseite der Stirnwand eines offenen Prismas (1) zwei Meßkörper (2, 3) angeordnet sind, die von der vertikalen Mittelebene (a, a) des offenen Prismas gleich weit rechts und links entfernt sind, und daß einer (3) der beiden Meßkörper in Richtung der Prismenachse so verschiebbar ist, daß die Größe der Verschiebung auf einer Maßteilung (4) oder Meßuhr abzulesen ist.Testing device for twist drills, characterized in that two measuring bodies (2, 3) are arranged on the inside of the end wall of an open prism (1) which are equidistant to the right and left of the vertical center plane (a, a) of the open prism, and that one (3) of the two measuring bodies can be displaced in the direction of the prism axis so that the magnitude of the displacement can be read off on a graduation (4) or dial gauge. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DEB130290D Tester for twist drills Expired DE467078C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB130290D DE467078C (en) Tester for twist drills

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB130290D DE467078C (en) Tester for twist drills

Publications (1)

Publication Number Publication Date
DE467078C true DE467078C (en) 1928-10-18

Family

ID=6997578

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB130290D Expired DE467078C (en) Tester for twist drills

Country Status (1)

Country Link
DE (1) DE467078C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608767A (en) * 1946-03-06 1952-09-02 George E Hall Gauge for cone tipped tools
US2626465A (en) * 1946-11-08 1953-01-27 Coventry Gauge & Tool Co Ltd Angle measuring device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608767A (en) * 1946-03-06 1952-09-02 George E Hall Gauge for cone tipped tools
US2626465A (en) * 1946-11-08 1953-01-27 Coventry Gauge & Tool Co Ltd Angle measuring device

Similar Documents

Publication Publication Date Title
CH665022A5 (en) Caliper.
DE467078C (en) Tester for twist drills
DE591332C (en) Device for increasing the measuring accuracy of dial indicators
DE745950C (en) Device for testing the tip of drills
DE859811C (en) Plug gauge
CH662647A5 (en) MEASURING SPIN FOR MEASURING THE INTERNAL DIAMETER OF HOLES.
DE321630C (en) Thread measuring device
DE523504C (en) Thread measuring device in the form of a caliper
DE524857C (en) Fountain pen
DE622379C (en) Device for the exact central clamping of shafts between tips
DE420526C (en) Device for testing cones
DE847205C (en) Dial indicator
DE710032C (en) Device for clamping the measuring stick of length measuring devices
CH240633A (en) Throat gauge.
AT94767B (en) Compasses for length measurements.
DE322859C (en) Device for testing and training people for their usefulness for fine measurements
DE355061C (en) Probe measuring device for checking the outside, flank and core diameter of threads, in particular of taps with an uneven number of flutes
DE327995C (en) Micrometer for inside measurement
DE815551C (en) Dynamometer
DE325348C (en) Teaching for taper pins
DE854098C (en) Teaching for testing inner cones
DE422675C (en) A device with dial indicator, especially intended for checking the pitch of internal threads
DE745881C (en) Device for the reference-free measurement of the pitch diameter of internal threads
CH214425A (en) Measuring device.
DE936235C (en) Carrier for the buttons of gear test devices