MD 180 Broken Mast
 

Here's something that's worth posting about....

Was out fishing this weekend and broke another mast, this time on my MD180. I always carry spare parts and tools with me but unfortunately since I upgraded to the newer style drive my spare parts don't fit the new drive minus the drive cables. In this case spare parts would have done me no good as the threaded portion of the mast snapped off inside the sprocket. On the older versions of the Mirage Drive you could just swap out the sprocket on the water with not too much difficulty. With the newer style drive you can't really do that. The correct way to fix this problem would be the warranty route, in that case I would have had to replace the entire spine, which includes the entire mechanism and sprockets and what not, and also waiting a couple of weeks to process.

A couple weeks without my drive...? No... that will not do...

So this is how I was able to fix it up!

Here is the moment I confirmed my broken mast! DAMN! It's going to be a looooonnnng paddle back...

http://www.bigwatersedge.com/bwegall...703839_iOS.jpg


Yep...

http://www.bigwatersedge.com/bwegall...621006_iOS.jpg


So on the way home, I gave Andy a call at OEX Sunset Beach. I told him about my broken mast and asked if he had a replacement mast available....and he did! While I was there I noticed that the broken mast that came off of the drive was in fact not the correct turbo fin mast but was the standard size st mast, which is at least an 1.5 or 2"s, short. I bought the drive new with the turbo fins installed too. I guess it was a mix-up at the factory...In any case I walked out the door with 2 new masts and a new project.

http://www.bigwatersedge.com/bwegall...727976_iOS.jpg

Broken fin removed from the drive.

http://www.bigwatersedge.com/bwegall...717568_iOS.jpg

Here was the task at hand...1/2" of broken mast at the bottom of this hole. UGH!

http://www.bigwatersedge.com/bwegall...752861_iOS.jpg

Here are the tools I used to get the broken mast out.

And the procedure was to center punch the broken piece as close to center as possible...check. Start drilling with a smaller sized drill bit and drill thru the broken piece....check. Step up the size of the drill bit to fit the size of the easy out....check. Insert easy out into correct sized hole and back broken piece out. Check.

http://www.bigwatersedge.com/bwegall...33510_iOS1.jpg

Here it comes!

http://www.bigwatersedge.com/bwegall...408901_iOS.jpg

Close up.
http://www.bigwatersedge.com/bwegall...414339_iOS.jpg

Voila!

http://www.bigwatersedge.com/bwegall...518715_iOS.jpg

New masts from Andy, screwed right into place! :luxhello: :cheers1:

http://www.bigwatersedge.com/bwegall...646701_iOS.jpg

Back in Business!

http://www.bigwatersedge.com/bwegall...951614_iOS.jpg


Thanks Andy for the spare parts, as you can see everything worked out just fine :cheers1:.

Impressive wrenching! I have had to do similar on snapped bolts on my son's moto bike. Glad this ended up working. The wrong sized masts were a surprise. This was one of the very first 180 drives, it had come with a Pro Angler, before I could even order separate drives.

Diggin' the new light and flakey carpet kit!

Looks like
 

That is nice carpet....Same color as the underside of a halibut, and fringe that looks like fins!

was failure result
 

of mast being shorter? or is this just one one the failures that comes with usage?

I would say it's a failure that comes with usage. I noticed that they have an updated version of the 180 drive that eliminates the screw and nut mechanism on the fin. Looks like they are calling it the MD180 V2. Looks like the style I have has now, since july has been discontinued.

https://static.hobiecat.com/web_uplo...07/MD180V2.jpg

nice fish
 

How many others feel this way?

"A couple weeks without my drive...? No... that will not do..."

Very resourceful! mad props!

I doubt warranty would let you go "a couple weeks" without your drive. That being said, nice work getting that out. Screw extractors are a life saver and a must have in everyone's garage.

Are the shafts stainless steel?

If so drilling SS is very difficult.

Unless they are less grade of SS.

Regardless, good job on repairs.

Absolutely looks like i need one of those thingamagies.

Nice work Tony... working like a surgeon.

They are stainless but it can be drilled if done properly. Drilling stainless requires high pressure, low speed and lots of oil. If you overheat it, it will blue and break your bits.

Nice work Tony, drilling out a broken bolt or stud is not easy because it's hard to drill centered and large enough to use an easy out that will bite well and hold the amount of pressure needed. In this case it helps that it's in a brass bushing and not rusted in. Even though this is a good post on a possible weak area. I wish you had told us about the nice Hali on board. I think the broken mast is because that mast had a defect other wise it would not have broken in that spot and not had stretch signs on the metal post instead of a clean break.

The mast was pretty hard, but like Shane said low speed, and also taking your time to get your drill centered as close as possible really helps. Starting with a small bit and stepping it up to a larger bit several times takes time so you have to be patient. At least it wasn't as bad as an exhaust stud...compared to one of those this one was a piece of cake...

...another thing that made this project challenging, is that the broken piece was recessed back into the sprocket about an 1" or 1 1/2...

Makes me wonder if Hobie were to score the mast an inch or so below the end of the sprocket to make a point where if the mast were to fail it would fail in a manner in which you could replace it without the use of special tools....Of course that would make a weak point...but that is the point...just a thought. It's alot cheaper replacing a mast as opposed to replacing complete spine assemblies...

Flawed Part
 

If the threads start that deep in the sprocket, it should reduce the cyclic stress where it broke, so I agree that there was something wrong with the part from the factory.

Or there is too much play between the mast and housing, or the housing flexes too much, and there isn't enough support past the threads. Or, Tony is just a beast.

Well said.


Sent from my iPhone using Tapatalk

No covered under warranty?

I gave Tony the masts...............on me.

Yes, Andy did supply me with the new masts. Hobie and Andy (OEX) have stepped up and taken care of me many times before, as well as all other Hobie owners.

...Good reason to buy your Hobie from OEX!

+1

Andy runs a glass operation.

REMEMBER guys TONY is Hobies stress tester, he is HARD on drives and other equiptment. Great job on the repair Tony. NOW go molest some moore BUTT.

Great job. One thing I have started doing is when I have to remove broken bolts is use a left hand drill bit. Most of the time it will remove the broken bolt or at least not tighten it up more.

Now go catch some more fish!!!

Def not a lesser grade stainless
The mast are made with Ph 17-4 SS which is heat treatable and is magnetic
The mast are much stiffer than 303, 304 or 316 SS of the same size.
As others have already said. Slow RPM with lots of pressure and cutting oil

Hobie probably thought that jumping up to .312 instead of .281 would eliminate the chance of breaking a fin mast :hmmmm2:

Good job on keeping the drill centered:notworthy:
I used a vice and a vertical mill to remove a broken one on a V2 drive last year
http://www.bigwatersedge.com/bwegall...0/P1060313.JPG
In our shop, we have better luck using square drive extractors instead of the spiral type
http://www.bigwatersedge.com/bwegall...0/P1060315.JPG

Tools used
http://www.bigwatersedge.com/bwegall...0/P1060321.JPG

Something to be on the lookout for
 

After I broke a mast fin, ful-rac pointed out that it probably broke due to corrosion.
After close examination, shureasshit he was right
This drive was 3 yrs. old at the time. If you notice, the corrosion extends deep into the fracture. And yes, I do rinse everything off after every trip
http://www.bigwatersedge.com/bwegall...0/P1060303.JPG

This was the other mast that hasn't broken yet

http://www.bigwatersedge.com/bwegall...0/P1050979.JPG
http://www.bigwatersedge.com/bwegall...0/P1050983.JPG

Keep an eye on your masts on the drives that have been used in the salt for a few years

You know we can't see your pictures?

Anybody else not seeing my pictures?
Using photobucket as the host

Photobucket is now a paid service and if you don't pay you can't use your photos on 3rd party websites. So upload your pictures to BWE instead.

Thanks
Let me see what I can do
I have always just used PB... until now