Yes, you can straighten a bent or dished diamond saw blade but it
takes some practise. You may initially warp it worse but (looking on
the bright side) the worse it gets the more practise you’ll get and
chances are eventually it will come right. That, in essence, is how I
Consider a metalsmith rasing a bowl. He’ll hammer a disc of silver or
copper, starting in the middle. The hammer blows thin and spread the
metal in the middle. But it’s surrounded by the rest of the unhammered
disc, so the stretched metal has nowhere to go with its added "length"
except up. In short, it bulges.
You want to do the exact opposite - get rid of a bulge. Therefore you
need to put the centre part of the blade into tension, so that the
raised area pops back down. You do that by putting the blade on an
anvil & lightly hammering all round the rim, trying to hit close to
but not right on the dimond bearing surface, and then spiralling
inward, but concentrating the blows on the rim to stretch that area
Keep checking your progress with a straight edge across the blade.
With practise you can true up the most amazingly bent blades that way.
Cheers & good luck