WHEN IT COMES TO THE HORIA TOOL, YOU NEED TO ADD 0.01MM TO THE CORRECTION

Yes, you read that right. Let me give you an example. If a part has an endshake of 0.08MM and you need to adjust it so that it is within tolerance (0.02MM to 0.06MM), you’ll need to push the jewel down. Now, let’s say I want to get my endshake down to 0.04MM. How many hundredths of a millimeter do I need to push the jewel down? You might think in your head that you need to push the jewel down 0.04MM (0.08MM - 0.04MM = 0.04MM) to achieve a 0.04MM.

WRONG

When it comes to the Horia tool, you need to add 0.01MM to the correction. So if I need to achieve a 0.04MM endshake from my current 0.08MM endshake, I will need to actually push the jewel down 0.05MM to achieve a true endshake of 0.04MM.

WHY DO I NEED TO ADD 0.01MM TO MY CORRECTION?

This is because the Horia tool itself has an error in it. Within the gears of the Horia tool, there’s a certain amount of slack. The slack actually adds up to 0.01MM in cumulative error. So if you use the Horia tool and move a jewel down 0.02MM, you actually moved it 0.01MM because of the 0.01MM in slack the tool has. If you need to make a 0.04MM correction, you actually need to move the Horia tool 0.05MM. If you need to make a 0.06MM correction, you need to move the Horia tool 0.07MM. So on and so forth. Whatever the correction may be, add 0.01MM to the correction.