2 months ago
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SNS 300: Spray Welding a Blower Shaft

#pump shaft #shaft repair #abom79 #thermal spray welding #Science & Technology
Pretty crazy we've made it to 300 episodes! It's been great bringing you a weekly video for so long to share not only work but activities around the shop I get into. Lets hope we can keep this going!
This week's episode to share with you a shaft that was sent to me to be repaired using my Eutectic spray welding process. The shaft had a badly worn bearing journal. Metalizing is a great way to repair shaft fits like these and save the customer money and time..
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#welding process #micro 100 #micrometer #machine tools #4 jaw chuck #thermal spray #machine shop #lathe work #machinery repair #dial indiactor #job shop #monarch lathe #machines #eutectic #lathe #indicating #spray welding #positive displacment diffuser #blower shaft #welding #positive displacement pump #bearing fit #welding overlay #buildup #gas pump #masking compound #metalizing #bearing journal #rototec #brazed on tool bit

Abom79 photo 1 SNS 300: Spray Welding a... Abom79 photo 2 SNS 300: Spray Welding a... Abom79 photo 3 SNS 300: Spray Welding a... Abom79 photo 4 SNS 300: Spray Welding a...

I’ve come to a conclusion; watching people at the top of their game doing what they do is somewhat soothing

by Henchman67 2 weeks ago

Am I a welder? No.
Am I a machinist? No.
Am I under the quarantine spell, watching random awesome videos for hours on end? Yes.

by Emperor 2 months ago

when i was a kid i took machine shop in high school. I have now watched several Abom79 vids. I dont watch to become a machinist, or learn cool techniques. I watch because it is always cool to watch a professional at work and do a quality job. I will always appreciate that. thanks for the vid Abom79, great work as always.

by Mno buzzz 4 months ago


by kram sdrawde 4 days ago

Back in the late 1970's the Aussie army was using this method to repair worm drive sprockets on M113 APCs and the finished repair was harder and wore better than the brand new replacement parts. If i remember the repaired parts would last 3 times the brand new ones this was because they were able to put a harder build up on the wear area of the sprocket to the cast hardness

by B Beck 5 months ago

Hi, I am a retired Eutectic Sales Manager. I thoroughly enjoyed your video and it brought back a lot of memories, especially the one's where I trained engineers in Africa on the benefit's of investing in this technology. We live in a throw away world, and when we see a worn part it's easy to go and buy a new one. Invariably, the part that's worn only represents 5% of the total part, so we are actually throwing away our own money! It really is a simple piece of kit to use, and like you say, just follow the instructions. Glad to see someone still using the Rototec system.

by Philip Rooney 4 months ago

Her: Is that how hot I am?
Him: huh?!?

by Jonas A 2 months ago

As of today 803 thumbs down. I am amazed at how many people that are so gifted that they can be so critical of his effort to give useful information and entertainment. I just wish there was more accountability in these comments. KEEP UP THE GREAT WORK

by Lyle Tiahrt 2 months ago

When you stumble across this and really have no reason to check it out, but watching the precision work keeps you interested. Truly nice work!

by WeekndNomad 2 weeks ago

me " wth is spray welding?"
me after 20 mins " I LOVE SPRAY WELDING"

by Franco Buzzetti 5 months ago


by Chico Reyes 1 day ago

i like this, never heard of it before, pretty interesting

by no body 1 day ago

Thought I would scan through it quickly , however I was quickly hooked, and ended up watching every minute. Fascinating. Thank you for sharing.

by DaddyFix 4 months ago

Why am I thinking about how much fun that thing would be with some magnesium powder?...

by Migraine Gainn 2 months ago

3.9369 in = 100 mm +/- 0.003 mm
Whatever it is, it was designed in metric

by Igor Borisov 4 months ago

Thanks for demonstrating this very interesting process and kudos to your skills and knowledge, the praise is well deserved - but I must ask, please, please please, don't polish rotating shafts by holding abrasive paper loops against it with your fingers. I work in Australia as a safety professional. I have attended an incident where a machinist with 30 yrs experience, very careful, regarded as all his colleagues as being one of the safest operators they know was doing this and it grabbed - his arm was pulled in and twisted around the shaft resulting in multiple breaks and many, many months of recovery. He said he was holding by just the fingertips, believing it would just pull free from his fingers; it doesn't. Before you can react it can pull your arm into the lathe. He is unable to return to work and was lucky not to have had his arm amputated. I know of two others who did lose their arms, torn off by the incident. One of them unfortunately died from his injuries. I know many machinists use this method and luckily do so for many years without injury - but it only has to go wrong once........... and I've also seen over many years and many incidents, the lasting impact such an event has on family and colleagues of injured workers. I suggest one method you could use is a frame to hold the abrasive, you can still control the pressure applied and if it catches, the paper just comes loose - you're left holding the frame, with no injury. I'm not saying this to put a downer on your work, quite the opposite - I just want to be able to continue to enjoy watching you do your thing well into the future. You (rightly) should be proud of the care and expertise you clearly put into your work; because your channel is popular, I hope it would also be an opportunity to educate others in the safest techniques possible.

by Brian Hughes 1 month ago

Randomly found this but was fascinated and loved every minute till the end. Thank you

by Jake Steel 1 month ago

This is the stuff about machining I always enjoyed, fixing random stuff. Maybe someday when I'm too stoved up to keep logging I'll get me a mill and lathe and spend my retirement tinkering with stuff. 25 years machining, did it all, but they don't want experience anymore they wan't grunt labor, so back to the woods I go

by northman logging 2 months ago

I love watching someone who loves his work and takes pride in it.

by kenthatfr 1 month ago

Hi, really enjoy watching your videos here in Scotland! Hope you don't mind me making a couple of comments - I worked for Castolin Eutectic for 30+ years and trained oxy fuel thermal spray system users. First observation relates to use of screw threading for preparation - I have never used this as a prep method for a couple of reasons.

The potential benefit of screw threading is to increase the effective surface area available for the coating, but there are some factors that can limit this effectiveness.

1. unless the threading is done correctly (ie. rounded tip and root profiles) there is a risk of heat oxidising the tips of the threads which will reduce or prevent effective adhesion of the bond coat.

2. If the thread pitch is too narrow in the root there may be voids, again reducing the effective area available for adhesion.

3. Threading preparation normally omits what for me is another vital step (which may answer questions raised by some of your other viewers regarding causes of coatings shelling) - oxidation forming during the preheat stage.

One of the key reasons for coating failure at the initial stage in my experience is applying bond coat on top of a surface that became oxidised during preheat. This is normally indicated by surface discolouration, usually evidenced immediately on applying heat. This is diffucult to see on a screw threaded surface, but becomes very visible if alternative preparation methods are used. So, I normally advise preheating, then final preparation. This is easier to do if it is possible to a, grit blast or b. random grind with a small grinder (with a clean disk). Step b. is usually easier since the initial set up of the part doesn't need to be disturbed. The clean, random ground surface is ideal for applying the bond coat to - but preheat, final light grind back to clean metal and immediately apply the bond coat.

It would be worth trying this method, what you should see on applying heat is the formation of a brown discolouration on the surface - coating on top of this (as is likely happening) is most likely compromising the coating bond effectiveness. Just give a final light grind back to bright metal and proceed from there. Hope this helps!

by Petros 55 5 months ago

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