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In lugnet.lego, Ross Crawford wrote:
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In lugnet.lego, Mark Bellis wrote:
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I believe that over the years the tolerance has been widened, with the aim
of reducing production cost.
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OK so I just went to my box of childhood LEGO (circa 1970-80) to check this
out. Discounting the CA bricks which have known deterioration problems, I put
together 4 stacks of 10 ABS bricks, 2 red and 2 white. I made sure I picked
out the “best looking” ones to avoid damaged edges etc which may have had an
effect. I noted 2 things:
- Several of the bricks had significantly less “clutch power”, though obviously this could also be from deterioration;
- The stacks ranged from 95.9 to 96.6 mm. It would be interesting to know if the brick tolerance is +/- 0.1 or 0.3 mm, either way they were all inside it. But there was still significant difference even with these old bricks.
So I would invite others who think the tolerance has widened to do similar
tests on older bricks to back up their claim.
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If exact brick size variation tends towards(1) a normal distribution there will
be equal numbers of oversized and undersized bricks. Measuring the length of a
“stack” of bricks will basically cancel out any error.
Scott A
(1) I say “tends towards” as I understand the ND is a theoretical construct.
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Message has 2 Replies:
 | | Re: Quality issue - update
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| (...) Have you accounted for common mode error? Many bricks are produced by the same mold. If 12 2x4s are produced per machine cycle, then 1 in 12 will be from the same part of the mold. The randomness of the distribution depends how many machines (...) (20 years ago, 5-Jul-04, to lugnet.lego, lugnet.color, lugnet.general, FTX)
| | | Re: Quality issue - update
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| (...) Agreed, with a large enough sample size. I hardly think 10 bricks (or even 40) would be enough to cancel out all such errors. Besides, if my stacks reduced the error, doesn't that mean the older bricks are actually likely to have worse (...) (20 years ago, 6-Jul-04, to lugnet.lego, lugnet.color, lugnet.general, FTX)
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Message is in Reply To:
| | Re: Quality issue - update
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| (...) OK so I just went to my box of childhood LEGO (circa 1970-80) to check this out. Discounting the CA bricks which have known deterioration problems, I put together 4 stacks of 10 ABS bricks, 2 red and 2 white. I made sure I picked out the "best (...) (20 years ago, 4-Jul-04, to lugnet.lego, lugnet.color, lugnet.general, FTX)
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