Rutland 913 Yaw repair

[Joeboy]

It is the bit circled in blue.
If i could reomve the yaw bearing assembly i could drill through from the other side as the other removed bolt is 180 degress.
The cable in the center is the problem.
Just a thought i wonder if i could sleeve the drill bit so it didnt chew the wire ??

I think I'd be trying to flatten off, centre punch & then drill out with cobalt drill bits then a decent quality screw extractor. Stainless is a bugger to deal with. Silver goop or a less expensive stand in can be a thread friend for reassembly.

Also a few go's in the freezer beforehand and mild heat with just a heatgun over a few days can work wonders for siezed threads as will 3 in 1 oil to break up aluminium 'rust' too..Can take a hell of a bite on the threads.

Combine all those and you'll be a onto a winner.

[Tinbum]

I try to weld a nut on as I hate easy outs etc as you end up in the predicament you are in!

Core drill, drill and tap to a bigger size

[openspaceman]

Stainless is a bugger to deal with.

Yes because it work hardens so easily, you need a constant feed so bit does not skid.

Core drill is a nice Idea if the part can be fixed in the vice of a pillar drill.

[ecogeorge]

Thank you all for suggestions.......
Think i'm going to look at drilling from the other side with a sleeved (new) drill bit . We stock bosch bits at work and they are quite good. Sure if i use a say 5mm drill bit sleeved in a short piece of pipe ?? i may be able to drill right through from the reverse side.
Once i have a hole in the correct place i could drill from the correct side with a larger drill bit.??
The practice of using stainless allen key bolts in aluminium without a bit of copperslip on the thread .grrr
There must somewhere be a guide to removing Yaw bearings which would seperate the piece i'm trying to drill out ..........

[Joeboy]

Thank you all for suggestions.......
Think i'm going to look at drilling from the other side with a sleeved (new) drill bit . We stock bosch bits at work and they are quite good. Sure if i use a say 5mm drill bit sleeved in a short piece of pipe ?? i may be able to drill right through from the reverse side.
Once i have a hole in the correct place i could drill from the correct side with a larger drill bit.??
The practice of using stainless allen key bolts in aluminium without a bit of copperslip on the thread .grrr
There must somewhere be a guide to removing Yaw bearings which would seperate the piece i'm trying to drill out ..........

I worked with stainless & aluminium for donkeys years in harsh subsea conditions. They are both great right up until they aren't. I applaud your ballsiness in wishing to drill through into a dry material from the other side blind. I would say that on average you'll be onto plums for a result.

I don't want to speak about oversizing from the outside and the use of helicoils as that's a couple of swearing days away. Genuinely, try freezing/heating then go in from the outside withe decent drill bits at slow speed and lots of cutting oil.

What is the unit price for a replacement assy? Gives a perspective maybe?

[Gareth J]

Can you get it to a competent welder? With a snapped off easy out in it too, your options for DIY are really limited. Even with the broken bit, welding *may* work. Especially if you can Dremel away a bit of the snapped bit with a diamond burr first.

Happy to offer but am sure you'd be able to find someone closer for less than the cost of shipping.

I don't mean to be rude but forget drilling it. If you've not got good experience drilling stainless (someone said it was stainless?) and a set of specialist drill bits + rig to clamp/drill rigidly, it'll end up in a bigger mess! I've got most of the above mentioned but wouldn't attempt drilling it out.

If you want to keep it in house, you could, maybe, core it our oversized and fit a rivnut. If the application suits that

[Gareth J]

Timesert is a better thread repair to aim towards than a rivnut

https://www.ebay.co.uk/itm/335297993253 ... media=COPY

Might as well keep in mind a good last resort option whatever repair/s you try first