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Technical Introduction of ZSN Series Intelligent Double-Flank Internal Gear Roll Testers
I     Instrument Description
ZSN series intelligent double-flank internal gearroll tester (hereinafter referred to as ‘instrument’) is a novel double-flank internal gear roll tester developed on the basis of the original JS series double-flank internal gear roll tester. It has been improved by Harbin Zhida in various aspects according to userrequirements. It adopts the computerized numerical control (CNC) technology and is capable of automatic acquisition and intelligent processing of the measuring data. It automatically measures the total radial composite deviation Fi”, tooth-to-tooth radial composite deviation fi” and runout Fr”. Additionally, it can quickly obtain the location and magnitude of burrs, enabling online deburring processes. Furthermore, given the theoretical center distance, the instrument is able to calculate the two-ball measurement (M) and the base tangent length (W) of the measured internal gear.
1. Main Technical Parameters 
Model ZSN20 ZSN30 ZSN40
Min. module of the internal gear (mm) 0.5 to 8 0.5 to 8 0.5 to 8
Max. outer diameter of the internal gear (mm) 200 300 400
Max. height of the internal gear (mm) 100 120 150
Min. resolution of the indication system (mm) 0.0001
Overall dimension of the instrument
(length*width*height, mm)
1290 * 650 * 1960
Supply voltage / frequency AC 210 to 230V/ 50Hz
2. Main Precision Indices: See attached Table 1
3. Measuring Functions
1. Total radial composite deviation: (Fi”)
2. Tooth-to-tooth radial composite deviation: (fi”)
3. Runout: (Fr”)    
4. Two-ball measurement: (M)
5. Base tangent length: (W)
4. Instrument Structure
1. A left layout is adopted that facilitatesthe loading and unloading of the measured internal gear, thereby achieving the maximum balance between convenience andstability. The measurementis of high efficiency. The quickadvancement and retreating control before and after a measurement is enabled by a handle, thereby simplifying the control of measurement process.
2. The rotation axis of the master gear adopts the mature precision ball bearing structure and is driven by a Japan PANASONIC digital AC servo unit. The measurement control is realized through the combination of a computer and a DMC3400 motion controller (Shenzhen Raiser). The deviations are measured through a high precision digital encoder (Britain Renishaw RGH24). All measurements are fully automatic.
3. Special loading tooling is designed according to different positioning ways of internal gears (internal hole basedor excircle based).
5. Software Introduction
1. A measuring software under Windows 7 is adopted. Basic parameters (tooth number, module, pressure angle and addendum modification factor) of the measured gear and master gear as well as the precision grade or free tolerance parameters can be input for error evaluation. There are two measuring modes to choose from: the normal double-flank mode and the center distance deviation mode.
2. The measuring speed and meshingrotation direction can be adjusted in the software;
3. The professionally designed internal gear axis eccentricity compensationsoftware effectively solves the problem of gear clamping eccentricity;
4.Measurement results can be output through a laser printer. Various common international formats can be applied to the measurement reports.
5. Measurement data are automatically saved. Quality indicators (Cp and Cpk values) can be automatically calculated with respect to product models and measuring dates. The saving format is compatible with Microsoft office.
II Standard Configuration
The standard configuration includes the following contents:
1. Measuring machine -------------------------------- 1 set
2. Special workbench --------------------------------- 1 piece
3. Computer -------------------------------------------- 1 suite
4.Master gear tooling ---------------------------------- 1 suite
5. Operation manuals ---------------------------------- 1 share
6. Packing list ------------------------------------------- 1 share
III Optional Accessories  
1. Internal gear clamping tools           
2. Master gear  
IV Requirements on the Instrument Installation Environment         
1. The instrument installation foundation should be solid and flat;
2. Two-phase AC power supply 220V/50HZ (±5%) should be used for the instrument. The supply voltage should be stable;
3. The environment should be free from electromagnetic interference.
V. Installation, Acceptance and After-Sales Service
1. Instrument packing box can only be opened under the supervision and approval of the technical personnel of the manufacturer;
2. After the completion of the instrument installation and adjustment, both parties should be jointly responsible for the on-site acceptance according to the technical agreement. A Final Acceptance Report should be signed by both parties upon completion of the acceptance;
3. In order to ensure normal operations of the instrument, in case of problems in the use of the instrument, the manufacturer should propose solutions to the user within eight hours after receiving a notice hereof. If the problems are not eliminated, the manufacturer should send technicians to the site to solve the problems within three working days.
 VI Quality Assurance
1. The warranty period of the instrument is one year. If any quality problem is discovered in the instrument itself within the warranty period, the manufacturer should provide maintenance service for the instrument for free; If the quality problem is caused by the user’s improper use, costs of maintenance shall be charged from the user;
2. An after-sales service system including regular return visits and telephone consultations is adopted to timely discover and solve problems and difficulties in the use of the instrument;
3. Original software functions of the instrument can be upgraded for free over the lifetime of the instrument.
 Attached Table1: Main Precision Indices
No. Item Verification Requirements Verification Tools
1 Workpiece shaft runout Axial runout: 3μm
Radial runout: 3μm
a.  Dial indicator
b.  Level 1 gauge block
2 Measurement shaft runout Axial runout: 3μm a.  Dial indicator
b.  Level 1 gauge block