Product Features

The base is made of high-quality cast iron and has undergone long-term natural aging treatment to ensure sufficient rigidity and stability;

By utilizing the principle of Einstein optics, real-time correction of Abbe error ensures measurement accuracy;

The projection reading screen adopts a novel projection system with clear image quality;

The workbench can move, rotate, and tilt in multiple directions, facilitating the inspection of various shaped parts;

The measurement accessories are complete and have a wide range of applications.

Product Usage

Projection one meter, two meter, and three meter length measuring machines are large precision measuring instruments for length measurement. It can accurately measure the internal and external dimensions of some ultra long workpieces, and can be used to calibrate fourth and fifth order measuring blocks with dimensions greater than 100mm using comparative methods. It can directly measure the calibration rod of the outer diameter micrometer, the inner diameter micrometer, and self-made measuring rod. It can also measure the internal dimensions, inner hole diameter, and external thread pitch diameter of various card plates. Widely used in inspection stations and metrology departments in industries such as aerospace, machinery manufacturing, and research institutes.

technical parameter

Measurement range (mm)

External dimensions: 0-1000, 0-2000, 0-3000

Internal dimensions: 13.5-900 13.5-1900 13.5-2900

Size measuring hook depth: 5-50

Measurement of external thread diameter: 0-140mm

Minimum division value: 0.001mm

Accuracy index

Indication error of micrometer ruler:

Within the range of ± 60 μ m, ≤± 0.20 μ m

Within the range of ± 60 μ m, ≤± 0.25 μ m

The indication error of millimeter ruler is ≤± (0.6+L/200) μ m

The indication error of the micrometer ruler is ≤± (0.5+L/100) μ m

Where L is the measured value, in millimeters

Measurement axis indication variability

External dimension measurement: ≤ 0.1μm

Internal dimension measurement: ≤ 0.5μm

Measurement force (N)

External dimension measurement: 2 ± 0.4

Internal dimension measurement: 1.5-2

Universal workbench (mm)

Vertical travel: 0-70

Lateral travel: 0-40

Horizontal position and vertical floating stroke: 10

Horizontal micrometer drum division value: 0.01

Workbench load: 10kg

Maximum clamping diameter of top needle holder (mm)

When the length is between 0-170, ф 140

When the length is between 170-210, ф 130

V-shaped bracket

Height adjustment range (mm):>28

Supporting workpiece diameter range: up to ф 30mm

Gauge block bracket: supports gauge block length up to 1000mm

Measuring block grinding frame: The grinding length of the measuring block frame is up to 100mm

V-shaped iron working range: up to ф 45mm maximum

Environmental requirements: Indoor temperature of 20 ℃± 1 ℃, relative humidity less than 60%

Instrument dimensions (mm)

JD9A 1980×450×750

JD21 2980×450×800

JD10A 4000×450×850