Moment Weighing Scales for Jet-Engine Blades Series WM

Precision measurement of jet-engine blade moments
Simple balancing of bladed rotors
Single-axis type for narrow blades and bi-axial type for wide chord fan blades
Optional software for optimized blade distribution

Design

Electronic scale on a base plate with built-in levelling device.

Weigh-beam mounted on knifeedges for friction-free operation, including oil damping, measuring system with load-cell and microprocessor-controlled measuring unit (digital display), thus, ensuring high weighing accuracy and repeatability. An adapter flange is provided for mounting the blade adapter.

Single-axis or dual-axis types according to the application and blade form.

Design

Range of application

Determining the radial, axial and tangential moments of jet-engine blades for evaluation of mass and position of center of gravity.

Application of the scale in testing, inspection and quality control.

With the use of the optional BLADIS Net blade-distribution system, the exact position of the blade in the assembly can be determined.

Technical data

Technical data at a glance		WM 02	WM 01	WM 00	WM 0	WM 1	WM 2	WM 0 BA	WM 1 BA	WM 2 BA
Measuring unit		Digital	Digital	Digital	Digital	Digital	Digital	Digital	Digital	Digital
Single-axis measurement		•	•	•	•	•	•
Triple-axis measurement							•	•	•
Jet-engine blade
Weight	[kg]	0,1	0,3	1	3	10	30	3	10	20
Radial moment	[kgm]	0,02	0,1	0,5	2	10	40	2	10	30
Tangential moment	[kgm]	-	-	-	-	-	-	0,25	1,25	2,5
Axial moment	[kgm]	-	-	-	-	-	-	0,25	1,25	2,5
Root radius, min. ¹⁾	[mm]	30	30	80	80	125	275	100	165	200
Machine
Width A ³⁾	[mm]	1000	1000	1200	1200	1500	2000	800	1500	1500
Depth B ³⁾	[mm]	800	800	1000	1000	1200	1500	800	1000	1000
Height C ³⁾	[mm]	300	300	500	500	600	800	600	1000	1000
Flange radius ¹⁾	(mm)	30	30	80	80	125	275	100	165	200
Sensitivity	(gmm)	0,1	1	10	20	100	1000	20	100	500
Power requirement	[V]	230	230	230	230	230	230	230	230	230

Basic machine	Order No.	R0710100.01	R0710200.01	R0710300.01	R0710400.01	R0710500.01	R0710600.01	R0710700.01	R0710800.01	R0710900.01
Options
BLADIS Net 2)	Order No.	R0710101.01	R0710101.01	R0710101.01	R0710101.01	R0710101.01	R0710101.01	-	-	-
BLADIS 3D 2)	Order No.	-	-	-	-	-	-	R0710201.01	R0710201.01	R0710201.01
Revolving flange	Order No.	-	-	-	-	-	-	-	R0710802.01	R0710902.01
Calibration Master	Order No.	R0710103.01	R0710203.01	R0710303.01	R0710403.01	R0710503.01	R0710603.01	R0710703.01	R0710803.01	R0710903.01

1) Distance from axis of rotation to blade root
2) Blade distribution system (software and hardware)
3) Data non-binding, dependent on the respective equipment

If the mass distribution of the blades is known, the blades can be installed on the turbine disc in a sequence that will result in the lowest possible residual unbalance. This may become a difficult task, even in standard applications, and in particular when the unbalance of the disc is to be compensated for by the blade positions.Complex tasks of mass and radial moment processing are completed quickly, efficiently and cost-effectively by the blade optimization program BLADIS Net. This runs on an IBM-compatible PC directly connected to the moment weighing scale.For multi-axis evaluations BLADIS 3D is available.
The central element of the Schenck RoTec moment weighing scale is a solid, horizontal beam mounted friction-free on knife-edges. With a blade mounted on the adapter flange, the moment is determined by a precision loadcell and the lever-arm. In the case of singleaxial scales, the important radial moment is determined.A digital measurement and display instrument ensures a broad measurement range along with high display sensitivity.
With multi-axis equipment, the axial and tangential moments can also be measured. This is especially necessary for wide chord, heavy blades. With the single-axis scale only the radial moment is determined.

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