JPH02228501A - Measurement of axial deviation of hole formed orthogonal to axis line of axial body - Google Patents

Abstract

PURPOSE:To enable quick measurement of a axial deviation without degrading a measuring accuracy by mounting a measuring element on a measuring device and then, setting an axial body with a pin inserted into a hole to be measured on a base. CONSTITUTION:A measuring element 5 is mounted at the tip of a slide rod 4 of a measuring device 3 which is provided on a stand 6 and a base 7 is provided on the stand 6 with a top plane thereof parallel to the bottom surface of the measuring element 5. An axial body 1 is set level on the base 7 and a pin 8 is inserted into a hole formed orthogonal to an axis line of the axial body 1 with both ends of the pin 8 sticking out of the hole. Moreover, the slide rod 4 is lowered and both ends of the pin 8 is pressed with the bottom surface of the measuring element 5. Then, the measuring device 3 is set to zero with the bottom surface of the measuring element 5 abutting both ends of the pin 8. Thereafter, the axial body 1 on the base 7 is inverted and with the measuring element 5 abutting the pin 8, a measurement is performed to calculate a half of an error from a reference value thereby measuring a core deviation of the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring misalignment of a hole formed perpendicularly to the axis of a shaft body to which a gear is attached, for example.

[Conventional technology]

Conventionally, the misalignment of a hole formed perpendicular to the axis of a shaft body has been measured using a method using an indexing table, a method using a three-dimensional measuring device, or the like.

[Problem to be solved]

As shown in Fig. 2, there are operational difficulties in both the method of measuring the misalignment of the hole 2, which is perpendicular to the axis of the shaft 1 and formed with a -C, using an indexing table and the method of measuring it with a three-dimensional measuring device. However, it was not something that anyone could easily measure.

Therefore, with this invention, anyone can easily reduce the measurement accuracy by attaching a new probe to a measuring device that measures linear distances, and setting a shaft with a pin inserted into the hole to be measured on the base. It is an object of the present invention to provide a method that can quickly measure misalignment without causing any damage.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a shaft body, which is a measuring object, in which a pin is inserted into a hole on a base provided opposite to the tip of a sliding rod of a measuring instrument for measuring linear distance. Set it on its side, attach a probe whose bottom surface is parallel to the base plane to both ends of the slide rod that protrudes from the pin hole, and press the pin from above with the probe. This is a reference value, and then the shaft is inverted and the measuring element is brought into contact with both ends of the pin to measure, and 1/2 of the error from the reference value is calculated.

[Effect]

In this invention, a measuring element is provided at the tip of a sliding rod of a measuring instrument such as a dial gauge or digital linear scale (D, L, S), and the shaft body with a pin inserted into a hole is laid down and set on a base. Lower the slide rod and bring the bottom of the probe into contact with both ends protruding from the hole in the pin. In this state, set the measurement value of the measuring device to zero. Next, turn the shaft over and apply the probe in the same way. 1/2 of the value is the misalignment.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

Attach the probe 5 to the tip of the slide rod 4 of a measuring device 3 such as a digital linear scale that measures linear distances, set the measuring device 3 on a stand 6, and place the measuring device 3 on the stand 6.
is a base 7 on which the bottom surface of the probe 5 and its upper plane are parallel.
will be established. The shaft 1 is laid down and set on the base 7, and a pin 8 is inserted into a hole 2 formed perpendicular to the axis of the shaft 1, and both ends of the pin 8 protrude from the hole 2. Let's do it like this. Slide rod 4 in the state shown in Figure 1.
, and press both ends of the pin 8 with the bottom of the probe 5. This state is as shown in FIG. 3, and the measuring device 3 is set to zero with the bottom surface of the measuring stylus 5 in contact with both ends of the pin 8. Next, the shaft body 1 on the base plate 7 is turned over, and the probe 5 is brought into contact with the pin 8 in the same manner as shown in FIG. The measured value at this time, 172, is the misalignment.

The parallelism between the bottom surface of the measuring head 5 used and the base 7 is 5.
Using a hole within micron, the measurement result and required time of a measurement object with a hole 2 with a φD of 1.5 mm compared to a hole 2 with a φD of 5M shown in Fig. 2 are average values with a misalignment of "0". .0
825 mm: 20 seconds/piece.

On the other hand, the results and required time using a conventional indexing table show that the average misalignment is 0.079 mm; 13 to 15 seconds/item, and the result using a three-dimensional measuring device is 0.077 mm;
7 minutes/piece.

This method was found to be short and extremely accurate.

In addition, when using a conventional indexing table, the pin 8 inserted into the hole 2 is one that does not play against the hole 2 (the difference between the diameter of the pin 8 and φd is small). However, in the present invention, even if the pin 8 has some wobbling relative to the hole 2, the measurement accuracy remains unchanged. Therefore, it is sufficient that the pins do not have to be prepared in small dimensional steps.

The measuring element 5 has a flat bottom surface at both ends, an arched depression in the center, and a screw 9 for attachment to the slide rod 4 at the upper part. It is desirable to prepare measuring stylus 5 of several different sizes to accommodate cases where the diameter of the shaft body 1, which is the object to be measured, is different.

A shaft body 1 as shown in FIG. 2 is used for attaching a volume knob, etc., or as a rotating shaft of various precision machines.

〔effect〕

As explained above, according to the present invention, a measuring element is attached to the sliding rod of a measuring instrument for measuring linear distance, and the shaft body is set by lying on a base having a plane parallel to the bottom surface of the measuring element. The error between the reference value and the value measured in the same manner with the shaft reversed, with the bottom of the probe in contact with both ends of the pin inserted in the hole as the reference value. By calculating 1/2 of , anyone can easily measure the misalignment of the hole in a short time and with high precision without requiring any special skill. Further, since there may be some play between the pin and the hole, this can be handled without preparing the pin in small dimensional steps.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the entire apparatus used in the measuring method of the present invention, FIG. 2 is a side view showing the shaft body which is the object to be measured, and FIG. 3 is a partially enlarged view of the measuring state. 1... Shaft body, 2... Hole, 3... Measuring device, 4... Slide rod, 5... Measuring head, T... Base, 8... Bin.

Claims (1)

[Claims] 1. A shaft body, which is an object to be measured, with a pin inserted into a hole, is laid down and set on a base provided opposite to the tip of a sliding rod of a measuring instrument for measuring linear distance. , Attach a probe whose bottom surface parallel to the base plane touches the tip of the slide rod at both ends protruding from the pin hole, and use the measurement value obtained by the measuring device when pressing the pin from above with this probe as the reference value. A hole formed perpendicular to the axis of the shaft, characterized in that the shaft is then inverted and the measurement head is brought into contact with both ends of the pin to measure and calculate 1/2 of the error from the reference value. How to measure misalignment.