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Jay Martin Profile
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Registered: 04-2010
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Re: Jay.... how much to repair???


Yes the addy is correct. I'll change the other..lol...

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www.jaymartinpropellers.com
Jun/2/2010, 6:13 pm Link to this post Email Jay Martin   PM Jay Martin
 
Bullet20dc Profile
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Re: Jay.... how much to repair???


bend them all like that one just say its a new design you're workin on emoticon

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Charlie B
Bullet20dc / 250XS
Politically correct impaired

Jun/3/2010, 5:53 am Link to this post Email Bullet20dc   PM Bullet20dc
 
1FASTLASER Profile
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Registered: 02-2010
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Re: Jay.... how much to repair???


Dont want to step on Jays toes but I do want to lend a hand here if Jay says its ok.......Since I have more cerifications than carters got pills if anyone needs a prop welded up before beeing repaired let me know. I know jay doesnt like to do any more welding on props than small up to 1.2 inch welds but I can lend a hand here if needed. Just wanted to pass this on. I am also certified in aluminum,titanium,A20 stainless.......you name it I have welded it and cerified in it.

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LASER'S n MERCS....SETTIN THE WATER ON FIRE
Jun/3/2010, 6:11 am Link to this post Email 1FASTLASER   PM 1FASTLASER
 
Jay Martin Profile
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Re: Jay.... how much to repair???


Welding it is not a problem, it's just them long cracks like coming back. I've repaired cracks as long as 4 inchs but they just won't stay. emoticon ..

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www.jaymartinpropellers.com
Jun/3/2010, 7:40 am Link to this post Email Jay Martin   PM Jay Martin
 
dougw Profile
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Re: Jay.... how much to repair???


According to UPS the prop should be at your shop sometime Monday.
Jun/3/2010, 6:52 pm Link to this post Email dougw   PM dougw
 
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Re: Jay.... how much to repair???


 Jay sometime when you got a minute give me a call and I will explain the procedure that you need to use to stop the crack from reappearing......I have repaired cracked blocks and never had a problem......in fact just last February I had to repair a rotor that had a crack in it that was being spun at 10,000rpms. The rotor goes into what they call a hydro pulper which is nothing more than a high speed mulcher.......but the thing has to be balanced and when we get through dialing it in the run out can be no more than .0002 or it will self destruct.

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LASER'S n MERCS....SETTIN THE WATER ON FIRE
Jun/3/2010, 8:32 pm Link to this post Email 1FASTLASER   PM 1FASTLASER
 
wevel2 Profile
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Re: Jay.... how much to repair???


im gona throw my penys in the well here im cert in serveral precias metals that boeing has tought me to weld. and yes theres some stuff u can do to make the weld stronger but if stress enough i dont care if i take it to work and friction stir weld it it will break again any time the molelecular sture of the metal has been changed after the pour it will be fatiqed and yes you can realive some fatiqe but unless you melt the prop down or by a 20 million dollar nitride borax dipper some stress will stay plus the fact that almost every prop ive seen has been treated by one process to another which adds to the problem of weld or haz area blade falure. i doubt if jays weld failed proly the haz around the blade cracked out which as stated above it is imposible to achive 100 percent strength on heat treated metals unless u can detreat for the lack of a better word which is usually a oven for a couple hours to a chemical bath followed by a 6 day trip in the furnace slowly bringing the metal tempture down then welding it with the exact alloy rods then having it reated then it would by far be cheaper to buy a new one... but for the most part if the prop guy says its liable to break it proly could if the edge has a nick and he says no problem not much strees on the edge then itl be allright i just wanted to state a little knowledge of metalurgy and how it goes hand and hand with props.... when i welded the pvs holes up on my beat up raker that was some soft metal i doubt it had been treated if it had it was a soft facet treating.

Last edited by wevel2, Jun/4/2010, 9:05 pm


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its almost done..wait... awl he!!..it will never be done
Jun/4/2010, 9:01 pm Link to this post Email wevel2   PM wevel2
 
Jay Martin Profile
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Re: Jay.... how much to repair???


Thats some very interesting info.
Heres the way it is, I know shops that would all but put there life on the line and say that his weld would not break and have seen the crack come back like majic. Welding large cracks are not as critical on props that never see the surface, but the minute you pop that prop above the surface it's like a ticking time bomb. The only real trick to stopping the crack from getting longer is to drill a hole at the end of the crack then weld.

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www.jaymartinpropellers.com
Jun/5/2010, 7:47 am Link to this post Email Jay Martin   PM Jay Martin
 
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Re: Jay.... how much to repair???


Well I'll be damn......WEVEL you suprised me at your knowledge. You and me would get along like 2 peas in a pod. I have always been the type if I am gonna specialize in something that I find all the RIGHT information and make sure I have the right knowledge before I say or do something and I see your the same type of person.

JAY

You are
EXACTLY
correct. That was the procedure I was going to tell you about. If a person takes the time to examine the crack and do it under magnification and find the end of it.....then you drill a small hole and reweld it from that point. But as Wevel pointed out the WAY that you weld it is the trick. TEMPERATURE and ATMOSPHERE conditions are so vitally important to a weld. Alot of people think that just cause they melted the metal that its correct....WRONG.......I wish I had a dollar for every pound of purge gas that I have used be it ARgon or Nitrogen or Helium or whatever. Also what Jay has said about the surfacing its not "If its gonna happen its WHEN"....Correct me if I am wrong jay....The reason its so hard on props when you surface one is due to Harmonics and the Stress factor. When surfacing a prop it needs to be perfectly balanced to even begin surfacing one. Then the stress factor comes in......its like this 2 blades are in the water and under an extreme load and the 3rd ear is out of the water and has ...I will use the term "Relaxed"....then when it reenters the water it is "loaded up again" and of course thhis is all happening at whatever RPM's your turning. That is why its so critical about either a weld or a prop that has or is being used in a surface application in all reality needs to be as NEAR PERFECT as possible in the "REAL WORLD"

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LASER'S n MERCS....SETTIN THE WATER ON FIRE
Jun/6/2010, 8:37 am Link to this post Email 1FASTLASER   PM 1FASTLASER
 
Jay Martin Profile
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Registered: 04-2010
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Re: Jay.... how much to repair???


You are correct, Having one B&B will aid the life of the prop but like you said, it's a matter of when it will crack, not if...This falls back to the old saying "If you want to play, you gota pay".



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www.jaymartinpropellers.com
Jun/6/2010, 9:07 am Link to this post Email Jay Martin   PM Jay Martin
 


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