I just purchased a 3 inch boring head for my mill /drill.
I wanted to check the accuracy to determine if I advance the dial to say .0010, what amount of stock am I actually removing. Well it turns out
that the graduations indicate the exact amount of stock being removed. So advance .0010, the head moves .005.
In checking this I noticed that in order to set the head for zero stock removal, the dial indicated .050, and not zero. I checked the run out with a dial gauge,
and adjusted the dial till zero deflection. The dial lined up with witness mark at the .050 line.
Now this is an offshore manufactured head, so I expected it would not have a very high accuracy, but .050 off is a lot. I can compensate for the discrepancy, but
I'd like to have the dial set at zero and get zero.
Is this normal for a boring head? Has anyone run into this, and how did you correct it?
I do understand that in boring a hole you'd probably scratch the id of the hole first then advance the required amount, so maybe this isn't an issue.
I have a couple of ideas to remake the dial so it can be adjusted to zero, but is there an easier way?
Any suggestions would be appreciated.
Thanks
I wanted to check the accuracy to determine if I advance the dial to say .0010, what amount of stock am I actually removing. Well it turns out
that the graduations indicate the exact amount of stock being removed. So advance .0010, the head moves .005.
In checking this I noticed that in order to set the head for zero stock removal, the dial indicated .050, and not zero. I checked the run out with a dial gauge,
and adjusted the dial till zero deflection. The dial lined up with witness mark at the .050 line.
Now this is an offshore manufactured head, so I expected it would not have a very high accuracy, but .050 off is a lot. I can compensate for the discrepancy, but
I'd like to have the dial set at zero and get zero.
Is this normal for a boring head? Has anyone run into this, and how did you correct it?
I do understand that in boring a hole you'd probably scratch the id of the hole first then advance the required amount, so maybe this isn't an issue.
I have a couple of ideas to remake the dial so it can be adjusted to zero, but is there an easier way?
Any suggestions would be appreciated.
Thanks