DE3503661A1 - Prismatic measuring instrument for measuring outside diameters and keyway depths, and for measuring the cylindricity of round workpieces - Google Patents

Abstract

For the purpose of convenient, rapid and accurate measurement, the measuring surfaces of the prismatic measuring instruments are placed on the workpiece in such a way that the prism is at right angles to the workpiece. In this case, the measuring mandrel, which is guided in a bore through the apex of the angle alpha , transmits the length from the bearing point (F) of the workpiece up to the apex (S) onto the scale of the measuring instrument. The scale of the measuring instrument is tuned to the angle alpha and directly displays the diameter.

Description

description

Prism measuring device for measuring outside diameters, keyway depths and for measuring the cylindricity of round workpieces.

The subject of my invention is a prism measuring device with the help of which Measure the outside diameter, keyway depths and the cylindricity of round workpieces can.

All measuring devices known to me for measuring outside diameters work do not use the measuring method I have described, but measure the diameter of the round workpiece at the intersection of the centers with the periphery of the Circle.

Two-point measuring devices such as callipers, U-bolts, quick buttons, Thickness gauges and roll gauges have the following with respect to round workpieces Disadvantages: a) uncomfortable posture when measuring on the lathe; b) long expenditure of time with a lot of sense of measurement in order to be able to measure precisely; c) partially too small measuring range; d) the probe arms of the roller measuring device must be on the before the actual measurement Diameter can be adjusted.

The invention was based on the object of the above-described deficiencies to fix.

The theoretical method of the invention is based on the fact that - the legs of the angle (&) lie tangentially at points (A) and (B) on the workpiece, - the center line of the Measuring mandrel (5) runs as the bisector of the angle 6 through the vertex of 6, - the ratio (SF: FZ) only depends on the angle (d) and not on the diameter, - in the special case (α = 60 °) the ratio (SF: FZ = 1: 1) - by scanning the workpiece (1+) with the mandrel (5) at point (F) the diameter is determined if the scale of the measuring instrument (6) is adjusted to the angle (d), at = = 600) means that the scale of the measuring instrument (6) must show 2 mm when the measuring mandrel (S) covers a distance of 1 mm.

given: The circles with the radii b and c touch the legs of the Angles at points A, A ', B and B'.

Both circles touch at point F '. The contact radii AZ1 αH1Z2; BZ1 and B1Z2 are perpendicular to the legs of the angle (tangent theorem) Claim after claim for α = x arbitrary: special case α = 60 ° a: b = (a + 2b): c (a: b) = 1: 1 = (a + 2b): c Proof: II theorem of rays Proof: (a + b): b = (a + 2b + c): c sin (α: 2) = b: (a + b) (a + b) .c = (a + 2b + c) .b (a + b): ß = 1: (sin 300) ac + bc = ab + 2b2 + bc (Q: ß) + (b: b) = 1: 0.5 ac = ab + 2b2 (a: ß) + 1 = 2 ac = (a + 2b) .ba: b (a : b) = 1: 1 a: b = (a + 2b): c ======================= sin (α: 2) = c: (a + 2b + c) (a + 2b + c) : c = 1: (sin 30 °) (a: c) + (2b: c) + (c: c) = 1: 0.5 (a: c) + (2b: C) +1 = 2 (a : c) + (2b: c) = 1 (a + 2b): c = 1 As a practical solution to the theoretical procedure A prism measuring device is used to measure outside diameters, keyway depths and the cylindricity of round workpieces, consisting of a prism (1) with measuring surfaces (2) and (3), a collet (8), a clamping nut (7), a clamping thread (11), two heat protection handles (13) and a measuring device (6).

The measuring surfaces (2) and (3) are either attached to the prism (1) with the help the screws (9), or the prism (1) and the measuring surfaces (2) and (3) consist of one piece.

The measuring surfaces (2) and (3) are either made of hardened steel or made of hard metal and must either be lapped or ground.

The material of the prism (1) with measuring surfaces (2) and (3) should be free of tension so that the angle (di) does not change.

The width of the measuring surfaces (2) and (3) should be such that you can put them (2) and (3) on without much feeling of measurement.

A measuring device (6) is clamped into the clamping device (7), (8) and (11), with whose (mandrel (5) the diameter at point (F) is scanned.

Depending on the requirements, a caliper gauge is used as the measuring instrument (6), a micrometer, a dial gauge or an electronic position transducer with digital display in question.

Dial gauges and electronic position transducers with an ejection spring for the measuring pin (5) have the advantage that the measuring pin (5) always has almost the same measuring pressure rests on the workpiece.

The scale of the respective measuring instrument (6) must correspond to the ratio (: FZ), which depends on (dC), must be matched.

The angle (α = 60 °) seems to me to be the most favorable, because then (SF: FZ = 1: 1) is.

The two heat protection handles (13) are intended to prevent body heat is transferred to the prism measuring device.

They are made of rubber or plastic and are because of the grip grooved on the surface.

The adjusting screws (10) have when the measuring surfaces (2) and (3) the task of changing the angle (d) slightly to avoid inaccuracies of the measuring device (6).

With prism measuring devices for larger diameters it is not necessary that the measuring surfaces (2) and (3) converge at point (S) (Fig. II).

The screw-in feet (12) are intended for stationary operation, in which the prism measuring device is upside down.

The prism measuring device can also be used as a roller measuring device if the measuring surfaces (2) and (3) by four ball-bearing, hardened and ground Rollers (15), (16), (17) and (18) must be replaced. With this roller fitted A prism measuring device is moved over the roller and the diameter is measured at any given Job.

The keyway depth of a round workpiece is measured by using the mandrel (g) is inserted perpendicularly into the keyway and scans the base.

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Claims (4)

Claims 1. The prism measuring device for measuring outside diameters, Keyway depths and for measuring the cylindricity of round workpieces is characterized by that on the inside of the prism (1) are measuring surfaces (2) and (3), the (2) and (3) touching the workpiece (14) tangentially as the leg of the angle (dt) is thereby characterized in that in the clamping device, consisting of a collet (8), a clamping thread (11) and a clamping nut (7), a measuring instrument (6) with movable Measuring mandrel (Q) is clamped, is characterized in that the center line (FS beyond S) of the measuring mandrel (5) as the bisector of the angle (dC) through the The vertex of (di)) runs, the measuring mandrel is in a hole that goes through the vertex of the angle (&) goes, is characterized in that the ratio (SF: FZ) depends on the angle (dt), is characterized in that SF: FZ = 1: 1, .ifs 600 is, is characterized in that the movable mandrel (5) by a The spring built into the measuring instrument (6) always applies the same measuring pressure to the workpiece (14) rests at point (F) and scans the diameter, is characterized by that the distance SF to the diameter of the workpiece in a certain ratio stands, this ratio is dependent on the angle (α), characterized by that the diameter of the workpiece (1+) is (SF) + (SF) when the angle = 600, is characterized in that the scale of the measuring instrument (6) is matched to the ratio SF: FZ, is characterized in that the The scale of the measuring instrument (C) shows 2 mm when the measuring mandrel (5) has a path of 1 mm and the angle is 600. 2. The prism measuring device for measuring outside diameters, keyway depths and for measuring the cylindricity of round workpieces is characterized according to claim 1, that the prism (1) with measuring surfaces (2) and (3) either consists of one piece, or that the measuring surfaces (2) and (3) with the help of the screws (9) on the inner surfaces of the prism (1) are attached, is characterized in that the measuring surfaces (2) and (3) made of hardened steel or cemented carbide and ground or lapped are, is characterized in that the material of the prism (1) with measuring surfaces (2) and (3) is relaxed, is characterized in that with the adjusting screws (10) the angle (d8) can be changed with the measuring surfaces (2) and (3) screwed on can, in order to compensate for inaccuracies in the measuring instrument (6), is characterized in that the measuring surfaces (2) and (3) in prism measuring devices for larger diameters are not converge at point (S), is characterized in that on the outer surfaces of the prism (1) two grooved heat protection handles (13) are attached, is thereby characterized that in the prism (1) brackets for exchangeable feet (12) available. 3. The prism measuring device for measuring outside diameters, keyway depths and for measuring the cylindricity of round workpieces as a roller measuring device according to the Claims 1 and 2, characterized in that instead of the measuring surfaces (2) and (3) four ball-bearing, hardened and ground rollers (15) (16) (17) (18) attached are, on each leg of the angle (tod) two pieces. 4. The prism measuring device for measuring outside diameters, keyway depths and for measuring the cylindricity of round workpieces is characterized in that the measuring instrument (6) either a caliper or a micrometer or a dial gauge or an electronic position transducer with digital display.