Now it varied by 1.5 thou -I was NOT happy. Before the regrind the indicator varied by almost 3 thou over the length of the bed. Once home I did some indicator measurements by using the tailstock as a sliding base and contacting the underside dovetail. It looked great when I loaded it up and drove home. Only 0.002" were removed (according to his measuring) from the top and about the same from the sides. He ground the top first and patiently let things cool between passes (2 days total). His grinder was old but looked well maintained and I think called blanchard.
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There is only about 2 places that will do this work that I could find -and they were a 7 hour drive away! The one I picked insisted on bringing the bedway and base together so that any warpage due to it's 33 year previous life would not be a factor. I had my bedway reground here in Ontario. I need to have this done to my lathe and I haven't researched the cost yet, but as with all things Hardinge it will be expensive! Since this is such a critical thing to get right I'm going to go with an experinced Haridnge shop on the bed regrindÄon, Thanks for that information. Over the years I've read a few horror stories about grinding shops ruining the bed plate to high temperature damage and other ways they were damaged. Since the carriage follows that angled edge, if that gets out of wack then you'll have problems. It is also critical that the angled sides of the bed plate are parallel to each other and the center line of the lathe. If there are existing shims under the bed plate then you know it's been reground at least once, and you'll need to factor that in. You will need to keep track of how much material you take off and add the same amout in shim stock under the bed He's a friendly guy who has freely shared information with me, and I know to a lot of other Hardinge lathe owners as well - you might want to give him a call. I've learned a few things about that topic from talking to Paul at Babin Machine.
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Jim - I forgot to mention some things about the bed grind question you asked.