bent shaft

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   How many thousenths is acceptable on a bent shaft before it is scrap? Does it have to be completly straight. Would you say 22 thou is acceptable at the end of the shaft. Can this be straightend out or should I buy new ? 

Thanks

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p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Topic: bent shaft Posted: April-19-2009 at 2:02am
	How many thousenths is acceptable on a bent shaft before it is scrap? Does it have to be completly straight. Would you say 22 thou is acceptable at the end of the shaft. Can this be straightend out or should I buy new ? Thanks
	Pat My 72 Skier Rock River Dixon,ILL.

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 9:50am
	Pat, 22 is pretty bad!! New ground round stock for shafting tolerance max's out at .002" in 24". Are you measuring on the boat or in V blocks? On the prop taper? Not that it really matters as you'll get the same ether way. Yes shafts can be straightened but if bent at or just aft of the strut it's a bad spot. Lots of stress right there. Also it's been bent once now it needs to be bent back straight and it will be weaker. No guarantees from the machine shop!!
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 1:41pm
	Pete Thanks . Measuring on v blocks, supported at hull seal and cutless bearing with dial indicater at the end of shaft after nut and at back of taper . inbetween supports is about 8 thou.
	Pat My 72 Skier Rock River Dixon,ILL.

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 3:58pm
	Pat, Sure sounds like the prop took a hit at one time with the bend at the strut. Why don't you take it to work with you one day. You guys must have a press down there. See what happens. All you have to loose is the PITA job of putting it in and taking it out!!
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 5:35pm
	Is that all they do to make it straight . Just use a press to bend it back? I kind of thought their was something a little more difficult than that . So how many thou is acceptable ? Pete , in your first post you said 2 thou tollerance on mill specs . Would that be what I need to shoot for ?
	Pat My 72 Skier Rock River Dixon,ILL.

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 6:43pm
	Pat, The worst bend is at the strut. If .002" in 24" is the norm, you can appreciate what .022" in about 4" is. Concentrate there as the .008" in the middle may just be the result of the bend near the strut. It's going to be lots of "trial and error" work in the press. You will get spring back so the shaft needs to be over bent. Even the pros who straighten shafts don't really know how much to give it. Have your V block/indicator set up next to the press and take it slow. Locate the high spot with the dial, mark it and press there. If I remember correctly, the .002 tolerance is the max anywhere between 24" centers. Place the shaft in the V block with 12" of the tapered end sticking out from the V block and measure on the taper like you already did. Shoot for the .002"
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 8:06pm
	Thanks Pete I think I will give it a try. I have a machine shop guy that may be willing to help . Should I try to straighten the bend after the strut first ?
	Pat My 72 Skier Rock River Dixon,ILL.

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 9:27pm
	Pat, Yes, I'd go after the bend at the strut first because the .008 in the middle may be coming from that bend too.
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Posted: April-19-2009 at 9:28pm
	thanks again
	Pat My 72 Skier Rock River Dixon,ILL.

p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Posted: April-21-2009 at 1:22am
	Pete thanks for the boost . I think I have it close now .1 thou at taper end , 5 in middle and 2 at trans .
	Pat My 72 Skier Rock River Dixon,ILL.

Gary S Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096	Post Options Post Reply Quote Gary S Report Post Thanks(0) Quote Reply Posted: April-21-2009 at 1:25am
	Is this on your Skier,Pat?
	69 Mustang HM SS 95 Nautique Super Sport

p/allen Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: March-14-2006 Location: Dixon Illinois Status: Offline Points: 942	Post Options Post Reply Quote p/allen Report Post Thanks(0) Quote Reply Posted: April-21-2009 at 1:46am
	Yes I bent it a couple of years ago . It always irritated me .But I never fixed it .I just ran the engine slower so it wouldnt vibrate as much . I think I will be ok now .
	Pat My 72 Skier Rock River Dixon,ILL.

Gary S Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096	Post Options Post Reply Quote Gary S Report Post Thanks(0) Quote Reply Posted: April-21-2009 at 2:01am
	Well nows the time to do it Pat.I have been in the garage the last couple of weeks getting mine ready,still got a few things more to go.One of which is checking my shaft. My strut was bent at one time and I never checked my rudder.It looks a little off and it figures I can't get the press at work to work right. It seems when it's cold it don't work right,maybe by the end of the week it will.
	69 Mustang HM SS 95 Nautique Super Sport

bent shaft

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