JD21

Projection 2M Length Measuring Machine

The Projection length measuring machine is a high precision optical instrument for measuring length. It can be used to determine the size of workpiece by means of direct and differential measurements. The chief uses of the machine are as follows:
. Differential measurements of the gauge block of 4th and 5th grade over 100 mm;
. Direct measurements of the calibration rods of the micrometer calipers, inside calipers micrometer and self-made measuring rods; Internal measurements of calipers gauge and bore diameter; Measurement of external thread pitch diameter. It can be used in inspection department of various factories and mines, scientific research institutes and the state metrological organizations.

The base of the instrumen
Ts, which is made of high quality cast iron, has enough strength and stability
Using measuring theory, real-time correct Abbe error.
Adopting a novel wax screen with magnifier as the projection reading screen, imaging clearly
The instrument has complete measuring accessories, it is easy to operate and its application is extensive

Main accessories:
1. V-type support
2. Block support
3. Gauge support
4. Large measuring arms
5. Small measuring arms
6. Circle of measuring standard
7. Center cradle
8. Three-wire supports' group
9. Φ 14 flat contact tip
10. Φ 2 small flat contact tip
11. Φ 8 middle flat contact tip
12. Spherical-end contact tip of RS20
13.1.5*8 knife-edge contact tip
14. Pads group
15. V-type iron
16. Sticking temperature gauge
* Measuring range
Type JD9A JD21 JD10A
External measurement without center cradle (mm) 0-1000 0-2000 0-3000
Internal measurement With measuring hooks (depth 5-50 mm) 13.5-900 13.5-1900 13.5-2900
External thread pitch diameter measurement up
To M140 To M140 To M140

* Instrument accuracy:
Minimum scale: 1 um
* Direct measurement of external dimension:
. 0-0.1mm Micron scale indication error 0.25 μ M
. 0.1-100mm Millimeter scale indication error (0.6+ L/200)μ M
. 100-1000mm Decimeter scale indication error (0.5+L/100) μ M
. Remark: L-Length measured in mm
* Fluctuation of instrument indication:
. External measurement 0.1μ M
. Internal measurement 0.5μ M
* Measuring pressure:
. External measurement 200± 20g
. Internal measurement 150-200g
* Universal table:
. Transverse travel 0-40 mm
. Vertical travel 0-70 mm
. Longitudinal motion in level position: 10mm
. Rotary motion: >± 3° Tilting motion: >± 3
. Transverse micrometers scale unit 0.01 mm
. Allowable load of the work table 10 Kg
* Maximum holding diameter of center cradle:
. Length 0-170mm: Φ 140mm
. Length 170-210: Φ 130mm
* V-type support:
. Height adjusting range: >28m
. Maximum diameter of supporting workpiece to: 30mm
* Block gauge support, supporting length to: 1000mm
* Ball gauge support, supporting length to: 1000mm
* Wringing length of block cradle to: 100mm
* Range of V-type to: Φ 45
* Dimension:
. JD9A 1980X450X750mm
. JD21 2980X450X800mm
. JD10A 4000X450X850mm

Model			JD21
measurement range (mm)	External size (mm)		0~2000
	Internal size (mm)		13.5~1900
	Depth of small and large measuring hooks		5~50
	Measurement of external thread mid-diameter		0~140
Minimum division value			0.001mm
Accuracy of outer size's measurement	Readout errors of division value in micrometer	within±60μm	≤±0.20μm
		beyond±60μm	≤±0.25μm
	Readout errors of division value in millimeter		±(0.6_L/200)μm
	Readout errors of division value in decimeter		±(0.5+L/100)μm
Readout transaction data of the gauging spindle		Measurement of external size	≤0.1μm
		Measurement of internal size	≤0.5μm
Measurement force	Measurement of external size		2N±0.4N
	Measurement of internal size		1.5N~2N
Universal worktable	Division value of horizontal micro-drum		0.01mm
	Horizontal stroke		0~70mm
	Vertical stroke		0~40mm
	Vertical floating stroke of horizontal position		10mm
Load capacity			10kg
Maximum diameter gripped by the tailstock		When the length between 0~170	φ140mm
		When the length between 170~210	φ130mm
V-type support	Adjustable range of height		>28mm
	Diameter range of the supporting member		up to φ30mm
Support frame for the measuring block			Its length up to 1000mm
Working range of V-type iron			Maximum to φ45mm
Ambient environment requirement		Room temperature	20 centigrade±1 centigrade
		Humidity	≤60%
Overall size (mm)			2980×450×800

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