A power saw comprising: an electric motor including an output shaft; a reciprocating assembly including a wobble shaft connected to said anvil member and a slide shaft connected to said wobble shaft and configured for reciprocating movement in response to rotation of said wobble shaft; a blade retaining assembly coupled to said slide shaft of said reciprocating assembly, said blade retaining assembly including a blade coupling configured to fixedly connect a saw blade to the slide shaft for reciprocating movement; characterised by: an impact assembly coupled to said output shaft, said impact assembly including a hammer member configured for rotation by said output shaft and an anvil member configured for rotation by said hammer member, wherein said impact assembly is configured to operate in a first mode when a mechanical load on said blade retaining assembly is below a threshold value, wherein said impact assembly is configured to operate in a second mode when said mechanical load on said blade retaining assembly is greater than or equal to said threshold value, wherein said hammer member is maintained in a fixed position relative to said anvil member when said impact assembly operates in said first mode, and wherein said hammer member intermittently impacts said anvil member when said impact assembly operates in said second mode. Robert Bosch GmbH an electric motor including an output shaft; a reciprocating assembly including a wobble shaft connected to said anvil member and a slide shaft connected to said wobble shaft and configured for reciprocating movement in response to rotation of said wobble shaft; a blade retaining assembly coupled to said slide shaft of said reciprocating assembly, said blade retaining assembly including a blade coupling configured to fixedly connect a saw blade to the slide shaft for reciprocating movement; characterised by: an impact assembly coupled to said output shaft, said impact assembly including a hammer member configured for rotation by said output shaft and an anvil member configured for rotation by said hammer member, wherein said impact assembly is configured to operate in a first mode when a mechanical load on said blade retaining assembly is below a threshold value, wherein said impact assembly is configured to operate in a second mode when said mechanical load on said blade retaining assembly is greater than or equal to said threshold value, wherein said hammer member is maintained in a fixed position relative to said anvil member when said impact assembly operates in said first mode, and wherein said hammer member intermittently impacts said anvil member when said impact assembly operates in said second mode. Robert Bosch GmbH an impact assembly coupled to said output shaft, said impact assembly including a hammer member configured for rotation by said output shaft and an anvil member configured for rotation by said hammer member, wherein said impact assembly is configured to operate in a first mode when a mechanical load on said blade retaining assembly is below a threshold value, wherein said impact assembly is configured to operate in a second mode when said mechanical load on said blade retaining assembly is greater than or equal to said threshold value, wherein said hammer member is maintained in a fixed position relative to said anvil member when said impact assembly operates in said first mode, and wherein said hammer member intermittently impacts said anvil member when said impact assembly operates in said second mode. Robert Bosch GmbH