JD18 Projection Universal Length Measuring InstrumentDetailed product description：

JD18 projection universal length measuring instrument

1、 Characteristics:
Using a projection screen for reading makes it more convenient to use. The projection screen adopts wax screen technology, with clear imaging and uniform field of view brightness. High quality cast iron base, strong rigidity, high stability, double line set single line reading system, high aiming accuracy. Multiple accessory configurations to meet various measurement requirements.

2、 Purpose:
Projection universal length measuring instrument is a length measuring instrument that combines precision mechanical, optical system, and electrical components. This instrument can be used not only for direct measurement and comparative measurement of the external dimensions of parts, but also for various special measurement tasks using the specialized equipment attached to the instrument.
External dimensions: Measurement of parallel plane objects, such as measuring blocks. Measurement of spherical flat objects, such as steel balls. The measurement of a cylindrical plane specimen, such as the diameter of a cylinder.
Internal dimensions: Measurement of parallel plane test pieces, such as pallets. Measurement of aperture, such as ring gauge.
Thread: Measurement of the pitch diameter of internal and external threads
Comparative measurement: Choose a horizontal projection optical tube (or visual horizontal optical tube) and a size adjustable measuring hook for comparative measurement.

3、 Instrument specifications and parameters:
measurement range
Direct measurement (mm): 0-100
Comparative measurement (mm): 0-500 (external dimensions)
Internal dimensions: When using a size measuring hook with a depth ranging from 4 to 50 mm, the range is 10 to 200 mm
When using an electric eye measuring device (mm): 1-20
When measuring the pitch diameter of external threads, up to 180 mm
When measuring the inner diameter of the internal thread at a depth of 10-50mm: 14-2 × (70 arm thickness) mm
Minimum division value (mm): 0.001
Measurement force: generally 1.5-2.5N
Instrument indication stability:
When measuring external dimensions, instrument stability: 0.3 μ m; When measuring internal dimensions, when the instrument is stable: 0.5 μ m
Accuracy of the instrument during direct measurement:
When measuring external dimensions:<(1+L/200) μ m; When measuring internal dimensions:<(1.5+L/200) μ m
(L is the length of the test piece, unit: mm)
Universal Workbench
(1) Scale division value of micrometer drum: 0.01mm (2) Lateral travel: 25mm
(3) Vertical travel: 100mm (4) Load capacity: 10kg
Maximum clamping diameter of the top needle holder: when the length is less than 85mm, it is 180mm in diameter; When the length is equal to 200mm: φ 20mm
Inner diameter fitting size of nut: φ 6H7; The outer diameter dimension of the measuring rod and the inner diameter of the measuring cap matching: φ 6g6

4、 Main attachments:
(1) Electric eye hole measuring device (2) internal measuring device
(3) Internal thread diameter measuring device (4) ejector pin holder
(5) Measuring head, measuring cap, etc. (6) Floating Workbench

5、 Instrument dimensions:
Length x width x height: 100 x 370 x 620 mm; Instrument weight: 127kg