Compare LBM and EBM

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Electron Beam Machining (EBM)	Laser Beam Machining (LBM)
A high intensity beam of focused electrons is used to supply heat for material removal.	A high intensity beam of laser (coherent photons) is used to supply heat for material removal.
EBM process is always carried out in vacuum (very low pressure) chamber to avoid collision of electrons with air molecules. Such collision canundesirably reduce kinetic energy of electrons and spread them.	LBM does not require vacuum chamber. It can be carried out in open atmosphere. Sometimes shielding gas can be applied in machining zone to avoid high temperature oxidation of machinedsurface.
It is suitable for small components as workpiece is required to keep within the vacuum chamber.	Workpiece size does not pose any restriction as it can be carried out in open environment.
EBM process is time consuming mainly due to creating a low pressure vacuum chamber.	LBM process is time efficient.
X-Ray is generated during EBM process. This possesses serious health concern to the operator.	No X-Ray is generated in LBM process.
EBM is applicable to electrically conductive workpiece materials only as workpiece must be grounded to stay neutral by transmitting striking electrons to the ground.	LBM is independent of electrical conductivity of workpiece material. So it can be used for both conductive and non-conductive materials.
Optical properties of workpiece surface (such asreflectivity, absorptivity, etc.) don't influence EBM process capability.	LBM process capability relies on the opticalproperties of workpiece surfaçe. High reflectivity can severely affect process capability.

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