DC motor repair. Generator repair. School balance. Carbon brush. Shanghai Nanyang Motor Guangdong repair factory. Diesel generator repair. The factory is advanced motor maintenance by Xiangtan Motor Factory, Jiangxi Motor Factory, Shanghai Motor Factory, Guangzhou Motor Factory A large motor repair shop consisting of technicians. The factory has advanced testing instruments and testing equipment, 2T and 5T dynamic balancing machine, F-class and H-class vacuum pressure dip coating device, motor failure analysis machine, high pressure withstand table; 5/10 ton driving crane; high and low pressure Motor no-load test station; DC motor test bench. The repair business covers the power, metallurgy, building materials, plastics, chemical fiber, paper, printing, mining and other industries. The factory specializes in repairing large and medium-sized generators, DC motors, speed control motors, multi-speed motors, three-phase commutator motors, explosion-proof motors, printing machine motors, traction motors, transformers, servo motors, synchronous motors, high and low voltage, AC and DC, Speed ​​regulation, imported motor repair, motor calibration and other services. The factory specializes in repairing imported motors around the world. Including ABB, the United States GE, Germany SIEMENS, Japan's Mitsubishi Corporation, Taiwan's Dongyuan, Datong and other imported direct AC motor, commutator motor. And become their special maintenance unit in the Guangdong area. The company specializes in various types of machining, mold processing, and non-standard parts processing.
Spherical lenses often used for aiming and focusing of monochromatic light source.Plano-Concave Lenses have a negative focal length and is typically used to cause a collimated beam to diverge as in a Galilean type beam expander or Telescope. Because the spherical aberration of thePlano-Concave is negative, it can be used to balance the aberration of other lenses. This lens is widely use in optical display systems, projection optics systems, imaging and laser measureemnt systerms.
We supply kinds of Plano-Convex Spherical Lens,plano-concave Spherical Lens,bi-convex spherical lens,bi-concave spherical lens,Meniscus Spherical Lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.
Specification of our spherical lens as follow:
Sales: imported motor carbon brush, imported DC motor carbon brush, French Roland carbon brush, British Morgan carbon brush, Germany Chongde carbon brush, Japan Fuji carbon brush 
*Material: BK7,fused silica,MgF2,BaF2,CaF2,ZnSe,ZnS,Ge or other optical crystals
*Dimension Tolerance +0.0 -- -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional
Plano-Concave Spherical Lens,Optical Plano-Concave Lens,Double-Concave Lens Kit,Simple Double-Concave Lens Kit
China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com