JD20 Length measuring instrumentDetailed product description：

Characteristics of JD20 length measuring instrument:
1. High precision and reliable measurement data.
2. Using optical projection reading, the brightness on the screen is high, uniform, the image plane is clear, and the operation is convenient.
3. The workbench structure adopts an interchangeable design, which is extremely convenient for assembly, disassembly, and adjustment.
4. The lighting adjustment is sensitive and reliable.

2、 Purpose: This instrument is a high-precision comparative length measuring instrument widely used in factory metrology rooms and metrology testing institutes to measure the external dimensions of three - and four gauge blocks and precision parts (such as steel balls, rollers, stepped precision parts, plug gauges).

3、 Specification parameters of JD20 length measuring instrument:

1. Comparison measurement range (mm): 0-180
2. Minimum division value: 0.2 μ m
3. Dividing range of the dividing board: ± 100 divisions
4. Measurement force (N): 1.20 ± 0.2
5. Fine tuning range of dividing line image: ± 5 divisions
6. Visual width of each partition: 1.7mm
7. The outer diameter dimension of the measuring shaft and the inner diameter of the measuring cap: φ 6g6
8. Measuring the inner diameter of the cap and fitting size: φ 6H7
9. Indication error: (0.05+△ L/400) μ m, where △ L represents the measurement range during comparison (μ m)
10. Stability of indication: 0.02 μ m
11. Dimensions of the instrument (mm): 320 × 230 × 820
12. Instrument weight: 30kg
4、 Attachments (including standard accessories and optional parts):
Ball bar workbench measuring cap lifter
Flat workbench R20 spherical measuring cap
Seven bar workbench with a diameter of 2 and a flat measuring cap
High volume block moving frame with a diameter of 8 for flat measuring cap
Low volume block mobile rack 1.5 × 8 blade shaped measuring cap
Flat parallel crystal 1 × 2 blade shaped measuring cap