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Upset question
- Thread starter hatrabbit
- Start date
- Replies 18
- Views 2,804
DMF_TomB
Diamond
- Joined
- Dec 13, 2008
- Location
- Rochester, NY, USA
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?? you mean somebody holding the ball of a ballpeen hammer on the hole and beating on the hammer with another hammer to peen the hole smaller ??
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most would ream the hole smaller or use a oversize pin or use a flexible roll or spring pin, or just use some loctite on it
Marty Feldman
Titanium
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- Feb 21, 2005
- Location
- Falmouth, Maine
"Upset" is a somewhat loose term, but as we tended to use it blacksmithing it would, for the purpose of your application, commonly refer to an operation on the pin, not the hole. The end of the pin protruding from the hole would be hammered (peened over) to form enough of a mushroom head to prevent its backing out of the hole.
-Marty-
-Marty-
Gordon Heaton
Titanium
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- Feb 19, 2007
- Location
- St. George, Utah
One simple method often used is to place a round punch (much smaller than the hole) about halfway over the edge of the hole and smack it hard enough to bulge the ID a bit in several places. If its being done by machine, you can use a punch larger than the hole and squish the full rim in one pass.
Naturally, some materials don't respond well to this method, but you see it used often in things like carburetor and valve bodies which are usually non-ferrous, but it works fine in most steels too. Few cast irons are suitable.
Naturally, some materials don't respond well to this method, but you see it used often in things like carburetor and valve bodies which are usually non-ferrous, but it works fine in most steels too. Few cast irons are suitable.
Larry Dickman
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I think "Upsetting" the hole would be called "Staking"
When's your term paper due ?
If you have a real need, show some real dimensions on a real drawing.
That is the language of the practical machinist's.
Rob F.
Diamond
- Joined
- Aug 5, 2012
- Location
- California, Central Coast
I would think that staking would be done with the pin in the hole.
Maybe peening is a better word than upset to shrink the dia of the hole
As Marty pointed out it's a pretty loose term. Where I work "upsetting" a Machined feature is not permitted. Someone tries getting an O/S bearing bore to pass inspection by placing a ball bearing on top of the Diameter and hitting it with a hammer--thus upsetting the bore diameter.
R
R
TDegenhart
Diamond
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- Mar 26, 2011
- Location
- Geneva Illinois USA
Another possibility is for the pin to have a radial grove into which the outer material is staked into via a ring stake.
Tom
Tom
DMF_TomB
Diamond
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- Dec 13, 2008
- Location
- Rochester, NY, USA
obviously if you center punch a dozen times close to hole edge it will close up the diameter but that will be more noticeable.
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its similar if shaft is under size to knurl the shaft so top of knurl measures bigger diameter. BUT under heavy load it usually doesnt last long.
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most times those hammer mechanic type quick fixes dont work too well.
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its similar if shaft is under size to knurl the shaft so top of knurl measures bigger diameter. BUT under heavy load it usually doesnt last long.
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most times those hammer mechanic type quick fixes dont work too well.
wippin' boy
Diamond
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- Sep 14, 2005
- Location
- il.
upset forging "increase diameter by reducing length "
per wikipedia
per wikipedia
DMF_TomB
Diamond
- Joined
- Dec 13, 2008
- Location
- Rochester, NY, USA
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cold working is similar to hot forging to change part shape BUT when you cold work metal it gets a stronger tensile strength with less ductility. eventually it will crack rather than allow pushing or hammering the metal to a more different shape.
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take a stronger grade 8 bolt and bend it. normally it will easily snap or break under load cause its damaged from it being bent. a weaker grade 2 bolt maybe you can bend once and it is still ok.
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got to watch cold working parts. when they crack, snap or fail often its with little to no warning. what appears to be ok is not ok under load
Bill D
Diamond
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- Apr 1, 2004
- Location
- Modesto, CA USA
But he says to do this to the bottom of a blind hole. I think he means to mushroom out the bottom and push the pin in so the base flows out into the mushroomed region. You could do it with a boring bar if you offset the work once it is at full depth. If the hole is not too deep you could use along a slim punch and punch the corners out a bit.
Bill D.
Bill D.
Gordon Heaton
Titanium
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- Feb 19, 2007
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- St. George, Utah
Hmm. I didn't read that as being a blind hole, but I see now you got that impression. The OP's wording about 'reducing' the diameter doesn't fit with the word 'mushrooming' in my mind. So, hatrabbit, which is it - a blind hole or a through hole?
crossthread
Titanium
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- Aug 5, 2004
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- Richmond,VA,USA
One way to "upset" a pin in a blind hole is to saw a slot in the end of the pin and insert a small wedge. When you smack the crap out of the top of the pin it will be locked in.
Booze Daily
Titanium
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- Ohio
I only know how to upset my wife.
wippin' boy
Diamond
- Joined
- Sep 14, 2005
- Location
- il.
not sure how any of that relates to my description of upsetting
but get at it
if you need me to be the one talking shit out of this whole thread I'm cool.
I'll go back to sleep
constant need to be more smarter is one of the reasons I took up Twitter anyway, that and porn , but that's changin' too :-(
nice chattin' D
hope your doing good JohnO
see ya again sometime
wb
wippin' boy
Diamond
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- Sep 14, 2005
- Location
- il.
I lied
it's cause I got a different job
and porn
it's cause I got a different job
and porn
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