One method of accurately checking the...

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Question 1 of 205eccef9bbacbc34ba4d452e6

One method of accurately checking the alignment of lathe centers is by moving a dial indicator, securely mounted on compound rest, between the two positions indicated on the test bar. If the dial indicator reading on the tailstock end of the test bar shows a higher (+) reading than the dial indicator reading at the headstock end, you should move the tailstock __________. See illustration GS-0141.

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🔍 Key Concepts

• Relationship between dial indicator direction of travel and the sign (+ / -) of the reading • How a higher (+) reading at the tailstock end means that end of the test bar is closer to the indicator contact point than the headstock end • Distinguishing between correcting side-to-side (toward/away from you) alignment versus along-the-bed (closer to/away from headstock) offset

💭 Think About

• Picture the indicator tip on the test bar: if the needle moves in the positive direction, did the test bar move toward or away from the indicator tip? • If the tailstock end gives a higher (+) reading than the headstock end, which end of the bar is closer to the indicator? To correct, do you move the tailstock toward the indicator or away from it? • Look at the answer choices: which pair (A/B or C/D) adjusts the tailstock sideways across the bed, which is what this test is checking?

✅ Before You Answer

• Be clear on which way the dial needle moves when the contact point is pushed in vs. released on a standard indicator • Confirm that a higher (+) reading at the tailstock end means that end of the bar is farther into the indicator tip (closer to you, if the indicator is on the front side) • Verify that you are choosing the option that adjusts the tailstock side-to-side (toward/away from you) rather than longitudinally (toward/away from headstock), since the test bar is already between the centers

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