It might seem that setting a dial bore gauge is a difficult task, however, with the right kind of instruments, it’s actually a lot easier than you would imagine.
Check out the 5 stages below:
- Set the micrometer to the size bore you wish to test
- Prepare the dial bore gauge with the required extensions for the bore diameter
- Put the bore gauge between the micrometer’s spindle and anvil
- Move the dial bore gauge back and forth and from side to side in the micrometer.
- Take note of the lowest reading and zero the dial indicator to that reading
It sounds easy enough, doesn’t it? And with the appropriate tools it is.
One of the hardest ways of setting up a dial bore gauge is manually, where you hold a micrometer in one hand and the dial bore gauge in the other. You’d think that’s easy enough, but it’s actually hard to zero the dial reading if both hands are already busy. And the Creator never gave us a third hand!
Using a Little Help
And because there’s no chance of growing one, someone had to come up with some tricks. The majority of workshops have a vice on the bench that is used for holding the micrometer nice and steady. (Ensure that you wrap the mic in a towel or use a vice with rubber pads so that the micrometer isn’t damaged)
- This makes the whole process that much easier due to the vice acting as that needed third hand.
- You’ll still have to do a little bit of a balancing act to zero that dial due to the round point on the gauge extension will want to slide off of the micrometer spindle.
One more tip is to mount the dial bore gauge in the vice and then employ the micrometer. By using this method, you’ll be rocking the micrometer rather than the dial bore gauge, but you just may find that this works even better. Once again, make sure to safeguard the shaft of the dial bore gauge from any possible damage when fitting it in the vice.
Enter the Micrometer Stand
Styled on the same precept is the micrometer stand, AKA “third hand”. This instrument has been specially developed to hold practically any sort of micrometer. Just make sure that you tighten the knob firmly and the micrometer will stay in place.
The great benefit of using such a stand is that you can easily adjust the angle of the jaws so as to make it that much easier to see the micrometer and at the same time work with the dial bore gauge.
Prior to using this fixture to set up your bore gauge, you’ll have to first set up the settings and away you go.