Bolt fit/interference fit/light drive fit
Posted: Sat Feb 18, 2012 10:31 am
Thanks Ken,
So that's for a close tolerance fit where you might have to bang the bolt in
with a 14 ounce hammer. A light drive fit is defined in the Standard
Aircraft Handbook as a .0015 max clearance between bolt and hole, where the
bolt will move when a hammer handle is held against the head and pressed
with the weight of the body. This seems to contradict what I read earlier
that up to .006 is acceptable, but sounds more reasonable anyway.
So if most of my 1/4 bolts mic out at .247-.248, what size reamer should I
get to end up with a "light drive fit". I would think getting 2 more at .247
and .248 would be pretty good, along with the ones I already have at .2495,
or should I go slightly undersize, say .2465 and .2475? I found in the
archives a link to KBC tools, which has a nearly infinite range of sizes for
about $15.00 (US) each.
Jesse
Exactly. An interference fit means that the hole should be smaller than
the bolt and the bolt has to be pushed or lightly tapped in.
Ken
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So that's for a close tolerance fit where you might have to bang the bolt in
with a 14 ounce hammer. A light drive fit is defined in the Standard
Aircraft Handbook as a .0015 max clearance between bolt and hole, where the
bolt will move when a hammer handle is held against the head and pressed
with the weight of the body. This seems to contradict what I read earlier
that up to .006 is acceptable, but sounds more reasonable anyway.
So if most of my 1/4 bolts mic out at .247-.248, what size reamer should I
get to end up with a "light drive fit". I would think getting 2 more at .247
and .248 would be pretty good, along with the ones I already have at .2495,
or should I go slightly undersize, say .2465 and .2475? I found in the
archives a link to KBC tools, which has a nearly infinite range of sizes for
about $15.00 (US) each.
Jesse
Exactly. An interference fit means that the hole should be smaller than
the bolt and the bolt has to be pushed or lightly tapped in.
Ken
I am confused about the meaning of "interference fit". When reading about
close tolerance bolts and reamers designed for them, I saw where a .5 to
1.5 thou interference fit was specified. Does that mean the hole is
supposed to be that much smaller than the bolt, or the other way round?
Jesse
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