Material Question

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I have a question regarding types of aluminium. I am in search of a tougher aluminium grade for the front gaurd of a unlimited hotsaw I built a couple of years go.  As per picture the front gaurd rides against the log keeping the pipes away.  The aluminium I used seems somewhat soft as the material stretches bending the 1 1/4 x .125 tube back towards the pipes.  I have since put a gusset behind but the material just seems to soft.  I think it is 6061 but not sure.  I will post a few other pics also.  I will be limited to staying with my design due to the drive setup etc.Robert AndrewsPredator Unlimited Hotsaw Attached Images
Reply:The tube in ? slides over the end of the bar mount and bolts through the front face. Attached ImagesLast edited by Rotax Robert; 03-06-2007 at 10:13 PM.
Reply:here are a couple of links, one is a comercial so I hope it is ok as the company don't exist anymore. the second video real shows how hard we hit the log and also shows the bar bending.  Never mind my yappin in the video, good footage at the end of what I am up against.Robert AndrewsPredator Unlimited HotsawLast edited by Rotax Robert; 03-06-2007 at 10:17 PM.
Reply:Holy crap!  What a saw!  You might have to use a harder aluminum like 7075 and bolt it together (cant weld 7075) or, this is the expensive route, weld it up and have the 6061 hardened to like t9 (I think this can be done).  The only danger here is it may become too brittle.Another idea is to maybe go chrome moly.  It wont be as light, but its not gonna be soft either.Various GrindersVictor Journeyman torch200cf Acet. 250cf oxygenLincoln 175 plus/alpha2 gunLincoln v205t tigLincoln 350mpEsab 650 plasmaWhen you can get up in the morning, Its a good day.Live each day like its your last.
Reply:HOLY SH!T!!!!OK, doolittle has some good suggestions.Looking at the pics of the saw, I would find a way to triangulate that gaurd.Can you either go from the top of the gaurd and tie down into the bar that goes through for the handles?......or, make the headers like an old set of zoomies with the support between all of the tubes and tie the gaurd into that support so it can't bend back?I think a stronger material will only be a temporary solution to the problem. I think you need a little more engineering in how it's attached.- Paulhttp://all-a-cart.comWelding Cart Kits and accessories
Reply:We don't take kindly to slugs from AS at this site
Reply:Slugs ???  great site, go there all the time, they just don't know it.  Anyway the bar lasts about 20 runs or so then I build/bolt on another.  I thought 7075 was weldable  hmmm.  Im pretty new to heliarc though.Rotax RobertPredator Unlimited Hotsaw
Reply:Titanium is weldable...
Reply:wow now thats a chainsaw sure your names not tim  Creative metal Creative metal Facebook
Reply:holy sh!t, I thought this was a joke at first.  You are very serious about your wood cutting, but why.  Is this something you did just because you could or does it serve a greater purpose?DewayneDixieland WeldingMM350PLincoln 100Some torchesOther misc. tools
Reply:Whattamachine!ThanksReal world weldin.  When I grow up I want to be a tig weldor.
Reply:what kind of v8 s it by the way(sorry 'm not too familiar with the american muscle powerplants)?I'd go Titanium btw.Idealarc 300\300 TIG AC\DC
Reply:might be a toyota or buick motor ya think?  Dont they make all aluminum jobbies?Various GrindersVictor Journeyman torch200cf Acet. 250cf oxygenLincoln 175 plus/alpha2 gunLincoln v205t tigLincoln 350mpEsab 650 plasmaWhen you can get up in the morning, Its a good day.Live each day like its your last.
Reply:It's got to be one of those Rover 3.9L all alumium v8's.
Reply:It isn't going to matter what material you use with that design... Tube that size is going to bend from the impact at dropthrough. Simple (overly so) analysis:The working lever arm is however far up the bar you bump the log, and the resisting arm is 1.25". Call this 12.5" to 1.25". Call the impact force 500 pounds minimum (figuring the saw to be in the ballpark of 250 from watchig the film), this puts about 5000 pounds over 1/4 square inch of material (<- oversimplifying.... the loading will likely be more than this in some cases, less in many) for 20000PSI. Once the bar begins to bend, any distortion is going to make the resisting arm effectively shorter, increasing the bending load. Several good hits and it lets go, even with KSI steel tube (yeild in the ballpark of 50KSI), though that may hold up longer. Solid aluminum may do it, but a etter profile and/or bracing is probably a better choice. Maybe replace the 1.25X1.25X0.125 with 1X2X0.187, hitting it the hard way?BTW: I am TRULY impressed with the machine.
Reply:Your saw rocks. But I witnessed a saw accident personally a few years back and I won't go near a running saw without a bomb squad suit. But that's me.Howd'd you come to choose "rotax" as part of your name?Craftsman 230a Buzz-box,  Lincoln 140T & 180T, Century K2789, PUROX W202 O/A14" cheapo chop saw that cuts straight and square!A toolbox of the cheapest Chinese tools money can buy"Real" tools all old reliable Husky/Craftsman/Proto stuff
Reply:Very nice, very nice, but can you miter with it?  Looks like a nice kit for the Boyscouts...ThermalArc 185MillerMatic 180 w/ AutosetVictor Cutskill Oxy/AcetyleneThermal Dynamics Cutmaster 38and spite!
Reply:Holy Sh**t thats a chain saw plus some!! What was your question? All I seen was that saw, lol.Patriot Performance AutoLincoln Power Mig 255CLincoln AC-225 StickVictor Journeyman O/AQuincy QT-5 Compressor
Reply:Someones gonna get hurt!!!Miller blue star 2eLincoln 175
Reply:A few specs on the saw.1963 Buick 215 cid507 lbshorse power  secret but way,way over stockruns 3/4 pitch harvester saw chainfastest cut  0.88 seconds through a 30" diameter log (world record)undefeated in 2006 Attached Images
Reply:SWEET MOTHER OF GOD!!!!!! thats a man size chainsawChuckASME Pressure Vessel welder
Reply:I have seen the small block Ford one you have... My guess would be a Ballistic Material..Lets face it...Any kind of metal would be a hazard in this application..You would need a "Blanket" of some kind...Love your work...And I thought my Stihls were the balls... ...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Holy COW!!!! That Thing is amazing--I have seen the two cylinder bike motors but nothing like that!!!  If your the record holder how many of these v8 chainsaws are out thereTime to rev up my toaster oven!