Surgical Torch

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Some places plasma just won't goGot a bad bearing.Need to pull the gear to get to it (14" gear).  Need heat to pull it (first strike against plasma)The bearing revealed.All of the surrounding crap cut/pulled/pried off the bearingNow to cut it off.  Two matching cuts on opposite sides so that it falls off in two pieces.more to follow..........................."Any day above ground is a good day"http://www.farmersamm.com/
Reply:The idea is to leave the shaft undamaged.Both sides.The two halvesSome things are beyond plasma, and always will be"Any day above ground is a good day"http://www.farmersamm.com/
Reply:To do this you preheat the entire length of the anticipated cut.Then start the cut at the outer diameter of the bearing on the end of the shaft.Cut from outside diameter to inside diameter.The oxygen stream will cut the entire 2 1/2" bearing race in one cut without much trouble once the cut is started.  The torch never leaves the outermost side of the race, the stream is merely directed inwards and downwards."Any day above ground is a good day"http://www.farmersamm.com/
Reply:Good job Samm, that is why I hardly use a plasma, at work or at home. They cut, they don't wash. I always start for the most part at the side of the whatever furthest from the torch and just feather the oxygen, kinda in a push pull motion a lot further back than cutting and try to lay that torch as flat as possible and look for that golden black line which is your base metal, and just follow it back to home free! Good work there! I hate being bi-polar it's awsomeMy Heroes Have Always Been Cowboys
Reply:Samm, it's like the old descriptions I've see for washing off rivet heads and the like, leaving the plate intact.  The heat doesn't conduct enough to cut between the interface of the two pieces if you are quick enough."USMCPOP" First-born son: KIA  Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:Run a bead of 7018 across the race that's froze on the shaft, most of the time you can tap them right off.
Reply:Nice work Samm. It's great to be able to learn a few tricks from the guys with a lot of experience.Miller Challenger 172Miller Thunderbolt AC/DC 225/150Miller Maxstar 150 STLVictor 100CVictor JourneymanOxweld OAHarris O/ASmith O/A little torchNo, that's not my car.
Reply:That beats the heck out of the way I had to do it.  I was broken down 8 hours from home and only had a file to get a seized wheel bearing off.It only took one hour of filing.  Glad I had a good file. Attached Images
Reply:Good job, Samm!! A scarfing tip works real good for inner races. I have to beg to differ w/ old skool on the bead on an inside race. Works great all the way around the circumference on an outside one.                                            MikeOl' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:Wouldn't a sawzall be quicker and less chance of cutting the shaft?
Reply:Originally Posted by ShortbusWelderWouldn't a sawzall be quicker and less chance of cutting the shaft?
Reply:I have used a torch,sawzall,grinder,and plasma. Best results with torch followed by plasma and grinder. If I cant pull it with my posi lock puller I get the torchMillermatic 252millermatic 175miller 300 Thunderboltlincoln ranger 250smith torcheslots of bfh'sIf it dont fit get a bigger hammer
Reply:Originally Posted by OxfordLet me know before you try, I am going to buy some stock in blades.
Reply:Originally Posted by farmshopI have used a torch,sawzall,grinder,and plasma. Best results with torch followed by plasma and grinder. If I cant pull it with my posi lock puller I get the torch
Reply:Originally Posted by ShortbusWelderWouldn't a sawzall be quicker and less chance of cutting the shaft?
Reply:Originally Posted by CraboBearings are hardened.  Very hard to cut with a blade.
Reply:Oxy/acetelyene is the only way to go for that type of job. We use it for cutting frozen bearings off axles, machinery etc. I even took a frozen pilot bearing off a truck transmission without damaging the shaft. It will always cut the first layer of steel, unless somehow you preheat the second piece red hot. You can wash a nut off a bolt, a head off a rivet. I've seen more experienced guys cut track pins out of dozer links without hurting the link.    Plasma, Arcair , or saws will cut everything, but they all have there place.
Reply:Kudos Sam.  Some of the farmers I've done work for would have both nicked the shaft and welded the race on.  Then brought it to me needing it done before noon yesterday.   They would have also mushroomed the shaft with a hammer and/or chewed it up with a pipe wrench.My name's not Jim....
Reply:good repair!Dynasty 200DXPassport plus w/ spoolmate 100victor 315c oxy/(act and prop)Miller digital elitemilwaukee power tools
Reply:I worked at a farm equipment dealership when I was in high school, and that is the #1 way to remove a bad bearing.  We cut hundreds of them clean and fast like that.  Anything else is just wishful thinking!Hemi-T"Ignorance can be fixed, but stupid is forever."Hobart BetaMig 2510Everlast PowerPro 256 TigMiller Radiator-1 Tig cooler