Hi guys,
I use the same Delta belt/disk sander. It's not great by any stretch, but with practice I've been able to grind all my turnout parts pretty successfully.
I have homemade milled aluminum fixtures for points and frog rails, which are used to grind these parts using the disk part of the sander. I freehand cutting the notches in the stock rails using the belt. Other than squaring up the ends of the rails, that's all I use the belt part of the sander for.
In short, it is all technique... It isn't a very well made sander so you need to try different things and practice to make it work for you.
JeffB
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