JPH05231802A - Relative measurement type centering bar - Google Patents

Abstract

PURPOSE:To accurately search a datum plane without relying on the sixth sense by attaching a lever type dial gauge, etc., to a cylinder having a prefixed diameter and changing the diameter of the cylinder to the movement of a pointer by utilizing a stool. CONSTITUTION:After a hole 2 is provided through the center of a cylinder 1 having a certain prefixed diameter, the fixing bar 4 of a lever type dial gauge 3 is inserted into the hole 2 and fixed with a screw 5. The cylinder 1 is placed on a stool 6 and a probe is brought into contact with the stool 6. Then, while the cylinder 1 is rolled leftward and rightward, the maximum value indicated by the pointer of the gauge 3 is read. The maximum value indicated by the pointer of the gauge 3 is equal to the diameter of the cylinder 1. Various bases can be searched by utilizing this principle. Thus the diameter of the cylinder 1 is changed to the movement of the pointer of the gauge 3. By attaching such relative measurement type centering bar to the collet chuck of a milling machine, etc., and rolling a work leftward and rightward while a probe is brought into contact with the end face of the work, the work is moved to the position where the pointer of the gauge 3 indicates the diameter of the centering bar. The position is the datum plane of the work.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Milling, Horizontal boring machine, etc.
To quickly and accurately find the work reference plane of a machine tool,
To use.

[0002]

2. Description of the Related Art A conventional centering bar is one in which a light bulb attached to the centering bar body lights up when a measurement portion hits a workpiece reference surface. The measuring part of the centering bar is separated up and down,
When the upper part is attached to the collet chuck of a milling machine, etc., and the lower part is slowly brought into contact with the workpiece reference surface, the amount of eccentricity between the upper part and the lower part disappears and the upper and lower parts are aligned in a straight line. Become. For example, there is an object whose processing reference surface is that time.

[0003]

The conventional centering bar often depends on the intuition of the operator. With the electric centering bar, it is difficult to know when it was hit by dust on the measurement surface, and when the objects that were separated from each other were the same, it was difficult to see when they were aligned in a straight line. The issue to be solved is how to find an accurate reference plane with peace of mind without relying on the intuition of the operator.

[0004]

[Means for solving the problem] To find the work reference plane without relying on intuition, attach a lever type dial gauge to the centering bar and change the diameter of the centering bar to the movement of the pointer of the lever type dial gauge. Let It is sufficient to visually check the changed movement of the pointer. A hole for fixing the lever type dial gauge of FIG. 1 is provided at the axial center of the cylinder having a certain diameter. Insert the lever bar (1) of the lever type dial (1) into the hole and fix it with the screw (1). Place the cylinder with the lever type dial gauge fixed on the surface plate of Figure 2 parallel to the axis of the cylinder as shown in Figure 2.
Put the probe of the lever type dial gauge attached to the cylinder on the surface plate in the figure. At that time, adjust the contact point so that the pointer of the lever type dial gauge moves. To remove the mounting error of the lever type dial gauge, roll it on the surface plate left and right as shown in Fig. 3, and read the maximum index of the pointer of the lever type dial gauge. That is, the maximum index of the pointer of the lever type dial gauge is the same as the diameter of the cylinder. You can use it to search for various criteria. As explained above, in the comparative measurement type centering bar, first attach the lever type dial gauge to the cylinder of the specified diameter and use the surface plate to measure the diameter of the cylinder and the movement of the pointer of the lever type dial gauge. Change to. Then read the diameter of the cylinder at the position of the scale pointed by the pointer of the lever dial.

[0005]

[Example] The comparative measurement type centering bar is attached to the collet chuck of a milling machine or the like by attaching the comparative measurement type centering bar to the diameter of the cylinder at the position of the scale indicated by the lever dial gauge and attaching it to the end surface of the workpiece. Apply the tip of a lever type dial gauge and slightly rotate the spindle on which the collet chuck is attached to the left and right to remove the error in the direction of concentricity and place the workpiece up to the position of the scale that indicates the diameter of the comparative measurement type centering bar. move. The position is the outer shape of the comparative measurement type centering bar. That is, the radius of the comparative measurement type centering bar is the reference surface of the workpiece.

[Brief description of drawings]

FIG. 1 is a plan view showing a comparative measurement type centering bar main body and a lever type dial gauge.

FIG. 2 is a plan view showing a place where a lever type dial gauge is assembled to a comparative measurement type centering bar main body and is placed on a surface plate.

FIG. 3 is an operation diagram showing a place where rollers are left and right around a shaft center on a surface plate in order to remove a mounting error of a lever type dial gauge mounted on a comparative measurement type centering bar.

[Explanation of symbols]

1 Comparative measurement type centering bar main body 2 Lever type dial gauge mounting hole 3 Lever type dial gauge main body 4 Lever type dial gauge fixing rod 5 Lever type dial gauge fixing screw 6 Surface plate 7 Lever type dial gauge attached, comparative measurement The figure with the centering bar on the surface plate and the roller on the left. 8 A diagram that shows the maximum scale index of the lever of the lever type dial gauge, with the contact point of the lever type dial gauge touching the surface plate with the comparative measurement type centering bar with the lever type dial gauge mounted on the surface plate. 9 A figure with a comparative measurement type centering bar with a lever type dial gauge mounted on a surface plate and a roller on the right.

Claims (2)

[Claims] 1. This comparative measurement type centering bar (hereinafter referred to as "centering bar") is a lever type dial gauge centered in the axial direction of the finishing centering bar up to the gauge allowable value of accuracy of diameter and accuracy of circularity. Etc. are assembled and used. this is,
This is because the lever type dial gauge attached to the centering bar measures the accuracy of diameter and circularity of the centering bar. Place it on the surface plate so that the outer diameter of the centering bar with the lever type dial gauge attached contacts the surface plate surface. Apply the tip of the lever type dial gauge attached to the centering bar placed on the surface plate.
At that time, adjust the contact point so that the pointer of the lever type dial gauge moves. After adjustment, roll to the left and right with the axial center as the starting point, and search for the mounting error of the lever type dial gauge. Then, the maximum deflection index of the pointer found by the maximum deflection of the pointer of the lever type dial gauge becomes the diameter of the centering bar. That is, in the comparative measurement type centering bar, a lever type dial gauge or the like is attached to a cylinder having a predetermined diameter, and the diameter of the cylinder is changed to a movement of a pointer of the lever type dial gauge or the like using a surface plate. The position of the scale indicated by the pointer is used to determine the diameter of the cylinder. This comparative type centering bar has this feature. Utilizing this fact, the reference surface of the work piece is compared with the conventional one by looking at the pointer such as a lever type dial gauge, etc. It's a bar. 2. The diameter of the cylinder can be changed by inserting a block gauge or the like between the contact of the lever type dial gauge and the surface plate.