Can X-Rays Find the Crack in our Chainplates?

Can X-Rays Find the Crack in our Chainplates? | Sailing Wisdom [S6 Ep9]

Рет қаралды 4,919

Күн бұрын

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The best way to check for cracks inside a chainplate is to look at them under X-Ray. Being a dentist, Herby zaps the old chainplates to look for any sign of a problem lurking beneath the surface.
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0:00 Intro
0:16 Why the channel is called Rigging Doctor
0:35 How to look at an X-Ray
1:25 Where most cracks happen
2:55 Finding a problem under X-Ray
4:28 Crevice Corrosion on different metals
6:16 Bedding Compound with Good Intentions and Bad Results
7:32 Beveling the Chainplate Holes with a Dental Drill
9:05 Next Steps
10:14 Outro
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Пікірлер: 75

@RiggingDoctor 7 күн бұрын

If you have a cracked chainplate, let me know and mail it to: Benavent Dental 5820 Clarksville Square Dr Suite 100 Clarksville MD 21029 I will X-Ray it for a follow up video

@h2oslider242 4 күн бұрын

Always entertaining watching people who nothing about testing or working with metals try to reinvent the wheel, good stuff. 🤣

@anthonyrstrawbridge 7 күн бұрын

Non destructive imaging/inspection. Early on busting knuckles I would inspect cylinder heads for cracks by simply cleaning the surfaces with solvent, wiping dry, then spraying with a podiatrist solution called athletes foot spray. As the powder dries white the crack will be wet and dark. At the machine shop they would do magnetic particle particle inspection which is simply passing current through the metal while dousing it with a ferrous powder to see where the voidd are. My favorite was when overhauling Lycoming/ Continental engines I learned to inspect with Zyglo. It is super duper thin die that will remain in any void after drying the part. It kinda blows which makes it easy on the eye but not the waste water treatment equipment. My last job involved maintaining large turbine power Thrush airplanes. Twice a year I would disassemble the wing root and an engineer would use a diamond tip stylus (ink pen sized) to measure wing attachment cracks. It was called Eddy Current Inspection. Apparently it can see tiny cracks somehow by measuring electron flow. A couple hundred bucks every time X 3 airplanes. 😊

@RiggingDoctor 7 күн бұрын

The technologies out there to test for failure before they happen is amazing!

@nomehdrider 7 күн бұрын

I was an NDE tech, Quality Manager for a small firm, now retired. A dentist is far more qualified to speak to many things, and no doubt has a great deal more experience with X-Rays than I, we mainly used source radiography with film, this doesn't typically have the sensitivity of X-Ray using a tube head with a CR plate. However, radiography inspection was not recommended for cracks, although with proper orientation and/or loss of material it does show up. The method for volumetric (internal) crack detection, in a plate like this, is shear wave ultrasonic testing. If you had the piece out like in the video, find a good lab in your area and have them UT it. But if you had it out, have a new one fabricated like the Rigging Dr, did.

@wonderboy6511 7 күн бұрын

For non-engineers, NDE is non-destructive evaluation.

@nomehdrider 7 күн бұрын

@@wonderboy6511 thanks

@feshfeshsailing 6 күн бұрын

Also refered to as NDT (non destructive testing). Dye penetretant method can also help identify cracks to a certain degree.

@RiggingDoctor 5 күн бұрын

@@wonderboy6511thank you for the explanation

@robertscholz4486 7 күн бұрын

If i might make a suggestion ... what you did with the dental drill will work, but if you used a a carbon steel fostner bit you could create an actual shoulder to fill with Butyl tape with an even circular shape and a flat bottom. This would in effect create a natural Butyl washer once the chainplate was attached and tightened to correct specifications. You can order the bits through Grainger.

@Pocketfarmer1 6 күн бұрын

Hard corners may lead to cracks .

@RiggingDoctor 5 күн бұрын

Good to know!

@nutsandbolts432 5 күн бұрын

Leave it to a dentist to use a very expensive drill to do the same thing the rest of us would do with a chamfering bit on the end of a cordless drill. I might have even used a deburring tool on bronze to get the same results in a fraction of the time. But, those shots and music with the dental drill looked a lot cooler than what I could have done.

@RiggingDoctor 4 күн бұрын

It’s where my mind goes when I need to make something small 🤓 I use those burs when I prepare a tooth for a crown so to me it’s like second nature to use it. I did end up getting a countersink bit and it did the same result in a fraction of the time.

@andrasferencz7948 2 күн бұрын

Exactly my thoughts as well! 😂 Having said that, this is a super-cool video!

@sailingaccidentalgybe 7 күн бұрын

Alas but I tossed my cracked chain plates. They would have been perfect for you to test. My father was a professor of metallurgy and he suggested to ring each piece. Hang it by a fine thread and tap with a hammer or similar. A good piece will ring nicely. Anything with a crack will sound dull. I'm curious if your one suspect chainplate might ring differently than the others. Mine did.

@robertlitman2661 4 күн бұрын

A valid test for grinding wheels too. I’d love to see it tried here.

@samholmessailing 5 күн бұрын

I recommend chamfering the bottom edge and using countersunk bolts. I didn’t when I switched to external chainplates and the sheets catching on them is so annoying. I ended up fairing over them with epoxy but its ugly.

@RiggingDoctor 5 күн бұрын

That is a good point with the sheets getting hooked under the chainplate. I hope that the way the sheets are routed will prevent them from fouling on it, but we shall see! If it becomes an issue, I know what to do. As for the bolts, my choices are very limited by the size of the fastener. Not much variety is available in 5/8”. I wanted to do a nice countersunk Phillips or Allen head but all I could find was the clunky Hex bolt. What size of bolt did you use on your boat? When I do this on Windpuff, I will probably get away with a smaller fastener since it’s a smaller boat. BTW, I love the carbon fiber reinforcement you put in your hull to beef up the structure when you did your chainplates!

@samholmessailing 4 күн бұрын

@@RiggingDoctor Good point, It might just be the way my sheets are run. mine bolts are 1/2”. Ive also seen people use carriage bolts and thought that might have been a good option too. It looks like you’ve also got a rub rail that might keep them from fouling.

@goneswimming5636 6 күн бұрын

Great video. I have been following your progress on the chain plates with great interest

@frednedgold4636 4 күн бұрын

Great show very interesting

@davidseslar5798 7 күн бұрын

I certainly hope *my* dentist doesn't chamfer chainplates between patients! 😬

@RiggingDoctor 7 күн бұрын

Only after hours 😎

@sailingavemar 6 күн бұрын

This was awesome. I'll have 8 bad chainplates to play with in a few months.

@RiggingDoctor 6 күн бұрын

If you want to mail them to me I will x-ray them for you ;)

@bobdodge6727 6 күн бұрын

Bevel and polish the edges of the drilled holes to reduce sharp edges. Sharp edges are stress risers in metal for cracking. The bevel will also retain Butyl bedding compound around the bolt and plate interface.

@todddunn945 6 күн бұрын

Of course since your stainless chainplates lasted around 40 years or more, you could have simply replaced them with new stainless and likely gotten another 30-40 years out of them. Presumably the original chainplates were made from 304 stainless. In that case upgrading to 316 would give them a even longer life since 316 is significantly less susceptible to crevice corrosion and corrosion in general than 304.. Even though 316 stainless is more expensive than 304, 316 is significantly cheaper than silicone bronze (likely less than half the cost of bronze) and generally much easier to find. Then there are the fasteners. 316 stainless bolts are much cheaper than silicon bronze bolts.

@Andyfunsail 6 күн бұрын

Aren't the new chain plates external so better made out of bronze?

@todddunn945 6 күн бұрын

@@Andyfunsail No stainless, particularly 316, is fine outside the boat. As long as the stainless is exposed to air it will maintain its protective oxide coating and suffer very little corrosion. The old chainplates were very susceptible to corrosion where they passed through the deck because that was likely to be both a wet and anoxic (without oxygen) environment.

@RiggingDoctor 5 күн бұрын

@@todddunn945you are correct, external stainless steel chainplates work very well. They can still develop issues on the face that attaches to the boat, but you can still see them much better to check on them. I did bronze for two reasons: 1. It can’t get any crevice corrosion 2. I like the look of it.

@liamstone3437 6 күн бұрын

A cheap counter sink bit would make perfect bevels around your holes and would take one second per bevel.

@peterhagen7258 5 күн бұрын

Yup, quick, easy & neater. But I did like the cinematography & lighting with the dental gear!

@clivestainlesssteelwomble7665 5 күн бұрын

For bronze you can use a plumbers tank cutter bit it's like a giant countersink bit but a longer cone taper and more cutting edges on the spiral.

@melinda5777 12 күн бұрын

Herby........ the best instructor. .....and dyi on the water!! ❤❤

@RiggingDoctor 11 күн бұрын

😎

@bobdodge6727 6 күн бұрын

Your new chain plates do not have the rigging attachment end angled to align with the standing rigging. Won’t this put a misalignment between the chain plate and standing rigging?

@RiggingDoctor 6 күн бұрын

It would, and in the next episode we will be bending them to the necessary angle

@davidross5291 6 күн бұрын

Always wondered if x-ray would show chainplate issues. They use it to inspect the spars on the Beech 18. Another idea might be eddy current testing. They use it on aircraft propellers to find micro cracks. I like the idea of beveling the holes to better bed the butyl but a counter sink would make nicer work of it.

@OMIF1 6 күн бұрын

Just use a little trig to find the angles Herbie. Right angle(ish) from the base of the mast. You have mast height. Angle will not change (similar triangles). You will be +/_ a a degree or 2, should be fine.

@MrOne925 5 күн бұрын

Another awesome video Herbie, could you share the company you got your bronze from in PA? I'm replacing my rudder gudgeons this year....

@RiggingDoctor 5 күн бұрын

I sadly do not know the company. One of my patrons has worked with this company his entire career and to get “his pricing” as opposed to “regular customer pricing” he did the whole transaction. I really wish I knew but I’m sure I will be using them again in the future with Windpuff and all his bronze needs. Maybe with time, my patron will loosen his lips and tell me who the foundry is. All I know is it is in Pennsylvania. Maybe a google search of foundries In Pennsylvania will help narrow the search.

@redwood1957 6 күн бұрын

Did you xray the bronze ones for a benchmark? Thank you

@Bimmertech4u 3 күн бұрын

It would be interesting if you could tell the difference in ringing between the SS chain plate with the suspected crack, and the ring of one that looked like it's not cracked. Theoretically, a crack would make the plate sound flatter. Probably would have to be clean though...

@RiggingDoctor Күн бұрын

That’s a great idea! If someone sends me some that have bigger or more obvious cracks on X-ray, I will be sure to give them a tap and listen to the ringing

@DowneastThunderCreations 6 күн бұрын

👍👍👍

@chhindz 7 күн бұрын

Hey Herbie. What if when looking at the X-rays I am on my MacBook which has a cracked screen. Might I needlessly replace all my expensive chainplates.

@RiggingDoctor 7 күн бұрын

Haha!

@webheadusa9377 6 күн бұрын

The closeup work with your dental drill is fascinating. What is the RPM of the drill? What metal is the bit? Was the bit a standard bit used when drilling a tooth? Thanks for your time. :¬) Webhead USA

@ted2704 7 күн бұрын

Good video. When you getting back to work on that fibreglass stern extension?

@RiggingDoctor 7 күн бұрын

Right after we get back from sailing this summer.

@ted2704 6 күн бұрын

@@RiggingDoctor I can't wait ! In the meantime, might I interest you in a bite guard and teeth whitening?.............lol

@Ron-zr6se 6 күн бұрын

Personally, I would never have chamfered the bolt holes by hand with a dental drill. The chamfering is uneven and produced sharp edges, both of which are highly undesirable.

@jonathanwetherell3609 3 күн бұрын

First rule of Engineering - No one knows if it is too strong.

@RiggingDoctor 2 күн бұрын

Second rule of Engineering - Another engineer knows it’s not strong enough 🤣

@Cheers_Warren 13 күн бұрын

Very cool! We need to find a chain plate with some hidden crevice corrosion cracks to X-ray!!!

@RiggingDoctor 7 күн бұрын

I made a pinned comment for people to mail them to me so I can x ray them. I had one that I kept as a sample years ago but I tossed it when I went Cruising.

@bryrensexton4618 7 күн бұрын

👍!!!

@brownnoise357 7 күн бұрын

Actually you need Crack Testing Fluid under UV Light to find Cracks in Metals, such as Cracks in Steering Racks for Car Steering Components. 🤔 Bob eta - who used to work on a Power steering Production line. 👍🌟🌟🌟❤️

@jonathanrichard1919 3 күн бұрын

What was your kvp and mas if you don't mind me asking

@RiggingDoctor 2 күн бұрын

The exposure settings were: 70kVp 7mA 60ms

@jonathanrichard1919 2 күн бұрын

@@RiggingDoctor thanks doc 🤙

@bfett68 4 күн бұрын

the humankind lost a remarkable dentist

@RiggingDoctor 4 күн бұрын

I still work a few days a week unless I’m sailing somewhere

@Building_Bluebird 13 күн бұрын

Interesting and fun video Herby.

@RiggingDoctor 7 күн бұрын

Thank you

@CraigOverend 6 күн бұрын

Doc, why do my teeth taste like copper after getting a filling?

@RiggingDoctor 6 күн бұрын

No idea 😗🤫

@pontoonrob7948 6 күн бұрын

Thanks for muting the sound of the drill😅

@RiggingDoctor 5 күн бұрын

You are very welcome. No one wants to listen to that 🎧

@JonMadsen70 9 күн бұрын

@RiggingDoctor 7 күн бұрын

Thanks!

@Ranchpig67 7 күн бұрын

Love what you do, but didn't you kind of negate your whole effort? Could have taken off all the chain plates, tested, when realized they were in pretty good shape, just replaced them? I mean they were in good shape for 20+ years, so replacements should have worked just fine. What am i missing or are you just one of those that enjoy projects? Which i understand, lol

@RiggingDoctor 7 күн бұрын

The stainless steel was in pretty good shape but they connected to an iron frame that was rusting away. The whole structure needed to be replaced so we simply switched to external chainplates.