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Explain this without saying it can't be done.

Permanently deleted user
Can you explain whether a round 3 inch diameter plug will fit into a 3 inch diameter hole. This is theoretical so we assume the hole and plug can exist.

If you do not think it would fit please explain why?

Sage 1
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Comments

35 comments

Date Votes
  • badsbsnf81
    Depends on the type of material the plug is made of and the material that makes up the hole.
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  • burn1bob
    of course it will fit. the 3" plug came out of a 3" hole to begin with.
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  • guns-n-painthorses
    If the plug is a material that will compress, it will fit. If we are talking 3" right down to microns, in hard steel, then not without cooling the plug and heating the hole.

    Got Guns?
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  • oldgunner
    In theory it might, but the hole and plug would have to be absolutely perfect. I don't believe that's practical. There are problems to consider such as friction and surface tension. Also air has to escape from the hole, which requires an outlet around the plug(if the hole is bottomed out).
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  • Maalox
    If the materials are non compressible than a 3" peg should not fit in a 3" the hole. I would think there should be some clearance between the two items for your scenario to work.
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  • fastcarsgofast
    KY will do it.[:D]
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  • FrancF
    Without getting off track Pipe is measured in ID.. and tube is measured OD.
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  • Marc1301
    It would fit.
    The plug being 3" OD, and the hole being 3" ID,.........assuming perfect machining, and a hard enough material.
    Would require a press fit, unless perfection existed, and some lubrication, either way to overcome friction from the angle of entry.
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  • JamesRK
    Need a bigger hammer.
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  • shoff14
    No. If both plug and hole are 3.00000000 and the bore of the hole is straight and the plug is concentric and the axis straight it will not fit. Its considered a slight press fit in the manufacturing world. Now if the hole was 3.001" and the plug 2.998" it would be a slip fit if the plug was prefect. Now you could have a plug that has a diameter of 2.998, but its axis may not be straight and could differ by .005 it would become a press fit.

    Machinery's handbook talks extensively about fits, there is probably 50 or more pages on the subject and charts for different types of fits.
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  • shoff14
    quote:Originally posted by Marc1301
    lubrication, either way to overcome friction from the angle of entry.



    Even with perfection there is nothing you can do to get the plug in without force. If lubrication is added, you will effectively make the plug larger and the hole smaller.
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  • shoff14
    Also look up stuff about GD & T.
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  • Spider7115
    Getting ready for a hot date, are ya? [}:)]
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  • Marc1301
    quote:Originally posted by shoff14
    quote:Originally posted by Marc1301
    lubrication, either way to overcome friction from the angle of entry.



    Even with perfection there is nothing you can do to get the plug in without force. If lubrication is added, you will effectively make the plug larger and the hole smaller.

    That is why I mentioned a press fit,......but no arguement from me.
    I don't claim to be a machinist![;)]
    I guess close only counts for hand grenades![:o)]
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  • AZEX
    with enough Astroglide, one can put a road cone through the eye of a needle.

    D.
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  • fideau
    If they are both the same size exactly then how could one fit into the other?
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  • LaidbackDan
    Doesnt really matter, that's why they invented duct tape.
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  • TooBig
    ID to OD
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  • FrancF
    quote:Originally posted by AZEX
    with enough Astroglide, one can put a road cone through the eye of a needle.

    D.


    ROFLMAO[:D][:D][:D]
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  • D1
    quote:Originally posted by FrancF
    quote:Originally posted by AZEX
    with enough Astroglide, one can put a road cone through the eye of a needle.

    D.


    ROFLMAO[:D][:D][:D]


    Sounds like first hand knowledge to me. Huh?
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  • fishkiller41
    As my pop says... With enough "KY" you can get a "light-pole in a gnats ass".
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  • iceracerx
    quote:Originally posted by shoff14
    Also look up stuff about GD & T.


    I'm not sure what GD & T has to do with the original question, but it is an "interesting" topic. I'm not sure what you would use for your "Datums". Are we going to assume chamfers on the "plug" amd "hole" to aide assembly? I like "it" when such a "simple" question requires a complex answer.
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  • rong
    As long as the material isn't too
    thick the hole can be 5 tenths
    smaller than the "plug"
    without "deforming" either
    and with select material
    the hole can even be
    smaller than that.
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  • tccox
    Some of youse guys have way too much time on your hands. Where is DANO when we need him? Tom
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  • Permanently deleted user
    Just to add something here.

    May or may not help to answer the question.

    If we had a 6 inch diameter bar there would be an exact 3 inch diameter element within the 6 inch bar as well as an exact 3 inch diameter hole if the 3 inch plug were removed.

    It appears they occupy the same space.


    Sage1
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  • cce1302
    heat the hole, cool the plug. stick the plug in the hole.
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  • frog21
    Sure it will fit,with enough powder behind it.My .277 bullets, fit my.270 rifle just fine.
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  • spryor
    quote:Originally posted by cce1302
    heat the hole, cool the plug. stick the plug in the hole.
    Yep, "shrink fitting". A common proctice in some machine applications, and some very good knife makers use this when fitting finger guards.
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  • mrseatle
    any rifling in said hole?
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  • FEENIX
    Yep, esp. with a little "hammer"-ly persuasion [}:)]!
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