Tools and methods for making and using tools, blades and methods of making and using blades, and machines for working on work pieces

A saw with fluid regulation, wherein the saw comprises:

• a housing;
• a drive assembly supported by the housing;
• a fluid supply supported relative to the housing;
• a cutting blade assembly supported relative to the drive assembly, wherein the cutting blade assembly includes a support structure and at least one cutting element supported by the support structure for cutting a work piece, wherein the support structure includes at least one internal flow passage way for fluid communication with the fluid supply;
• and
• a changeable flow element between the at least one cutting element and the at least one internal flow passage way and in fluid communication with the fluid supply and the at least one internal flow passage way, said changeable flow element configured to change the fluid flow exiting from the least one internal flow passage way to the at least one cutting element in response to changes in a fluid flow characteristic, wherein the changeable flow element is configured to open when a fluid pressure increases beyond a selected pressure.

A saw with fluid regulation comprising:

• a drive assembly;
• a frame supporting the drive assembly;
• a cutting blade assembly supported by the frame and including an internal fluid flow passage in at least part of the cutting blade assembly and at least one cutting element;
• and
• a pressure relief valve positioned on the cutting blade assembly and in fluid communication with the internal fluid flow passage and configured to be responsive to fluid flow changes in the internal fluid flow passage.

A concrete saw with fluid regulation comprising:

• a frame;
• a drive assembly supported by the frame;
• a blade drive shaft supported by the frame and driven by the drive assembly;
• a blade flange on the blade drive shaft;
• a concrete saw blade mounted to the blade flange, wherein the blade includes internal fluid flow passages and at least one cutting element;
• and
• a pressure relief valve upstream from the blade internal fluid flow passages and configured to change the fluid flow exiting the internal fluid flow passages to the at least one cutting element in response to changes in the fluid flow in the blade.

A machine for operating on work pieces and having with fluid regulation comprising:

• a drive assembly;
• a frame supporting the drive assembly;
• a working assembly supported by the frame and including an internal fluid flow passage in at least part of the working assembly and at least one cutting element;
• and
• a pressure relief valve in fluid communication with the internal fluid flow passage and configured to be responsive to fluid flow changes in the internal fluid flow passage and to chance fluid flow exiting from the internal fluid flow passage to the at least one cutting element.