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Grinding a railroad rail profile after thermite welding.
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Previously:
https://www.homemadetools.net/forum/...144#post120921
https://www.homemadetools.net/forum/...121#post115609
How many thou was that adjustment at 0:11 ?
"Give it a good spin until it feels right."
I guess if he has been doing it long enough, that is exactly what he did.
Around here they use a car that follows the welding process that crowns the entire length of rail and the new joints all in one process. There's a rail yard 1 mile from our house so we get to see all the cool toys!