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The heating system in our large old house is a ground source heat pump feeding a mixture of old cast iron and slightly more modern (but still old) pressed steel radiators. The pipework is iron. There is no zoning, and I am not even sure if this is a single or twin pipe system. All the pipe runs...

I have a table saw that I use a lot, but I am puzzled how to do non-parallel cuts. It is possible to fix a guide at an angle to the blade, but then of course I can't just slide the wood along the guide because it would need pass across the blade at an angle. For example, how can I cut a...