Can you explain why it is important not to use the full deviation in both directions? Why wouldn't the machinist correct the full amount of X and Y to bring the holes back to nominal?
Good point...this methodology is for rough calculations of true position!
Machinists should adjust to full deviations in both directions.
Can you explain why it is important not to use the full deviation in both directions? Why wouldn't the machinist correct the full amount of X and Y to bring the holes back to nominal?
Thought I explained that above? Treat your hole as 2 Radii. If you move your Center point in the worst case direction, Draw a Radius with a protractor in the plus Direction lets say your X is your worst, and you draw a Radius in X minus, Your circle is complete. But you haven't accounted your Y, But YOUR CIRCLE IS COMPLETE, so the only thing your circle or your 2 Radii have in common is a center point, so you already accounted for the 2 Radii in each direction of X and you can't create 2 more Radii in the Y direction, You'll end up with a wollered hole or circle. Now if you shift the 2 Radii equally from the center, again because your circle is complete. if you move it half the deviation, Then the 2 radii will move equally in the Y direction, without distorting the circle, because It was already created in the X direction. If this is to complicated for you. I would strongly urge you not use this. <<<< not being rude, just don't know if I'm explaining my theory good enough, I'm stating it works for me.
I'm with Buck on this one. Why would you tell a machinist to only adjust half the deviation in one direction? No need for calculations when making adjustments to nominal...
MetsoMetrology commented Today, 02:32 PM I'm with Buck on this one. Why would you tell a machinist to only adjust half the deviation in one direction? No need for calculations when making adjustments to nominal...
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Can't count the times I have told the machinist to move in both directions the deviation, Just to tell him or her on the next piece to move it back Half of what I told him or her in the first place. again it's 2 Radii Not 2 parallel sides like a square, that I would understand. Anyway maybe your Machinist or Machines are magnificent. I have yet to come across any, "Even though it looks good on paper don't always mean it's good," So far My batting average, Probably about 98% spot on. One move and done. Don't know why, but it works
MetsoMetrology commented Today, 02:32 PM I'm with Buck on this one. Why would you tell a machinist to only adjust half the deviation in one direction? No need for calculations when making adjustments to nominal...
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Can't count the times I have told the machinist to move in both directions the deviation, Just to tell him or her on the next piece to move it back Half of what I told him or her in the first place. again it's 2 Radii Not 2 parallel sides like a square, that I would understand. Anyway maybe your Machinist or Machines are magnificent. I have yet to come across any, "Even though it looks good on paper don't always mean it's good," So far My batting average, Probably about 98% spot on. One move and done. Don't know why, but it works
Oh and just to add, Let's say a hole is out .0012 in one direction. I'll tell them to move .0007 or .0008, boom within a .0001 Doesn't make sense but I leave error for tool wear or just any type of error. I think it has been more about trial and error.
Not being a smart azz, I'm mean yeah I am a smartazz, but, it just never seemed to work, I want to get these guys as close to Zero as possible, so they don't feel like I'm babysitting them, so the less I see them about parts the better we get along.
