Cheese
Member
Michael Kellough said:I still don’t understand how a straight smooth rod can be tightened non-concentrically. My technique is to do a quick twist to grasp the bit then open up the slightest amount that allows rotating the bit and then slowly re-tighten as I continue rotating the bit until it’s really tight.
When I realized that could happen and got it to run true (the multiple function buttons help, I set one to slow speed and can easily see how the bit spins) I marked the rod and chuck so I could get it straight again later but that trick for minimizing runout in bent tooling and crummy chucks didn’t work with a straight rod and a good chuck.
I feel for you Michael... [sad] [sad]...that's an awful lot of dinging around to do just to chuck up a drill bit.
I agree that it's a completely random issue, otherwise when you aligned the previous marked parts, the runout should be the same as it was, it shouldn't change.