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Thread: Interesting vee blocks
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29th Jan 2020, 09:47 AM #1Most Valued Member
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Interesting vee blocks
Here's a different vee block design I haven't come across before. The blurb mentions using them for inspection, but I can't think of a particular application where they would be used.
https://www.industrialtool.com.au/pr...categoryId=845
Steve
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29th Jan 2020, 10:12 AM #2Gear expert in training
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The blurb mentions inspecting for roundness; the balls mean you can freely spin a shaft in the block without worrying about friction or scuffing as you would in a regular V block
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29th Jan 2020, 04:27 PM #3Philomath in training
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Not even sure about that - if the balls were in contact with a surface plate so a shaft was truly parallel then when you rotated the shaft, the block would want to roll across the plate. If the balls were not in contact, then you are no better than a couple of bearings on a support block - there is still the issue of how 'parallel' the bearing axis (or the rotational axis of each individual ball) is to the plate.
It's an interesting concept but I'm not sure what concrete advantages it offers.
Michael
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29th Jan 2020, 09:23 PM #4Gear expert in training
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When testing for roundness, it makes no difference how they sit relative to the surface plate (the balls are not in contact with the plate) because you're testing fixed points along the axis, not sweeping the entire length; all you're doing is spinning the shaft and seeing how much the needle on your indicator moves. All you need is the magnitude of the deviation, the absolute value is irrelevant. It would be no different to taking 20 measurements around the shaft, at the same point on its length, with a mic. The datum is the balls, not the plate.
Same goes for testing runout of one diameter relative to another, the diameter on the balls is the datum for the diameter being tested.
Bearing would work, but only if you have bearings that fit each job.
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