Measuring Finished Chamber Dimensions

[Jud96]

Please post if you figure out a solution. My OCD now wants to measure chamber!

I have just been putting the finish reamer in the finished chamber and checking for wobble and measuring any perceived movement with a .0001 indicator. I also used an inside mic to check the .200 line and compare it to what the reamer measures. I think I’ll be ordering some pin gauges too for a quick reference to see if it’s oversize by at least .0005.

 

[jackieschmidt]

Yes, but how do you know you're on the .200 line?


Either way... this is one of those "probably don't need to overthink it" things.

^^^^^^^^^

 

[FireMedic]

If you want to do it in the lathe….a quick way would be to use your DRO in conjunction with a indicator mounted in your tool post. Touch one side of the chamber and set zero, go to other side until it just touches and then add the ball tip thickness of the indicator. This will give you the diameter. It should be easy to find .200 on z axis also. You will need to adjust indicator up and down to find the center of the chamber first though.