Glossary entry (derived from question below)
English term or phrase:
ball bearings
English answer:
round steel balls as used in ball bearings
Added to glossary by
Ken Cox
Nov 26, 2008 16:34
15 yrs ago
1 viewer *
English term
ball bearings
English
Tech/Engineering
Ships, Sailing, Maritime
keel measurement/regatta inspection
For the Yngling class the positions of the keel templates are specified by distances along the leading and trailing edges from the base of the keel (despite the fact that the templates are labelled by the height above the base plane, as is the rule for the Soling Class). In practice the two halves of the keel templates should be joined by end plates which are pinned. It is much more convenient to provide a horizontal plate on which the keel rests and then support the template at the correct height by three precision pillars. This allows the template centreline to be aligned with that of the keel, and for the front of the template to touch the leading edge. In the case of the Yngling the pillars were made so as to comply with the distances along the leading and trailing edges. This system makes it easy to align the template, which is then wedged in place for gap measurement.
Care should be taken to ensure that the gap measurement is made at the appropriate edge of the template, and ideally ball bearings of the appropriate minimum and maximum sizes should be used to test the gap.
What does it mean in this context?
Care should be taken to ensure that the gap measurement is made at the appropriate edge of the template, and ideally ball bearings of the appropriate minimum and maximum sizes should be used to test the gap.
What does it mean in this context?
Responses
4 +2 | round steel balls as used in ball bearings | Ken Cox |
5 | rollers | José J. Martínez |
Change log
Dec 10, 2008 07:43: Ken Cox Created KOG entry
Responses
+2
9 mins
Selected
round steel balls as used in ball bearings
The balls used in ball bearings are manufactured to very tight tolerances and are in principle perfectly round, which means they have the same 'thickness' (diameter) regardless of their orientation. This makes them ideally suited to checking the width of a gap between two curved objects (in this case, the keel and the gauge template).
For instance, if the allowable width of the gap is specified to be 'no less than X and no more than Y', the inspector can check this reliably with four balls: one slightly larger X, one slightly smaller than X, one slightly smaller than Y, and one slightly larger than Y.
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Note added at 13 mins (2008-11-26 16:48:15 GMT)
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Another relevant aspect here is that due to the curvature of the surfaces, the balls will contact each surface at one point only unless the radius of curvature of the contact surface is smaller than the radius of the ball. This is very convenient in the described situation.
For instance, if the allowable width of the gap is specified to be 'no less than X and no more than Y', the inspector can check this reliably with four balls: one slightly larger X, one slightly smaller than X, one slightly smaller than Y, and one slightly larger than Y.
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Note added at 13 mins (2008-11-26 16:48:15 GMT)
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Another relevant aspect here is that due to the curvature of the surfaces, the balls will contact each surface at one point only unless the radius of curvature of the contact surface is smaller than the radius of the ball. This is very convenient in the described situation.
Note from asker:
Sorry I meant to award this answer - it makes sense. Unfortunately I clicked the other one by mistake. Sorry for that. |
Peer comment(s):
agree |
Jennifer Levey
: Yes - it's by far the easiest and most accurate way to measure the gap.
38 mins
|
agree |
Polangmar
1 day 8 hrs
|
4 KudoZ points awarded for this answer.
Comment: "Selected automatically based on peer agreement."
4 mins
rollers
Mechanical items. See your dictionary please.
Discussion
Yngling ) Yawling ?? or is it all about making shoes??
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