Diresta Bandsaw Restoration 20: Brazing a Broken Babbitt Bearing Casting
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- Опубліковано 14 кві 2022
- Diresta Bandsaw Restoration 20: Brazing a Broken Babbitt Bearing Casting
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Keith, Any progress on the DiResta Bandsaw project?
Looking forward to seeing it up and running.
Best regards,
Wayne
Hi Keith - really enjoying the Diresta bandsaw restoration- when will you be uploading more videos?
Keith, I'm 69 and I was taught by a much older guy that did nothing but work with cast iron his entire carreer, he taught me to always after the braze has been done imediately peen the entire braze with a peening hammer to relieve any of the stresses out of the joint, and back then he would cool it in box of sand. He said It always came out perfect. Just passing it along.
I was taught the same way. It seems to work.
Patiently waiting for you to finish up the bandsaw project.
I find that after you are up to temp, turn your pressure down some so that it is a more gentle flame. It doesn't blow the braze out quite so much. I'm not talking about neutral/rich settings. you still want to maintain the neutral flame just tun down the regulator (re-adjust the flame as needed) some so it isn't blowing as hard. I've also used a propane hot plate to braze on so that it keeps a good even fire on stuff while you're brazing so you aren't fighting to keep it hot....worked great. for smaller parts I put them in an old cast iron pan on the hotplate kept it good and hot, keeps the chill off then cover with a thick aluminum foil, post heat and let cool slowly. the iron skillet provided the mass to keep the small parts warm while it cooled. So the point of this is to say provide extra external heat, stop extra airflow and provide additional thermal mass. this allows a more gentle controlled flame in the puddle so the torch isn't trying to do double duty of keeping heat in the part and controlling the "weld"/braze bead. BTW 300 series stainless MIG wire (especially flux core rated for dissimilar metals) also make a very good cast iron weld which you can use with the torch or mig. It has a very high nickle content and works great on cast iron. I only ever had difficulty on a thin blower housing and a singer sewing machine treadle....this is where the external heat and mass again saved the day....cheers
I (and certainly many others) really appreciate you taking the time to share your experience. I found it very helpful 👍👍😎👍👍
Thanks for using a filter on the camera so we could see the actual brazing. I watch all of your videos. Thanks also for your help with keeping history of these wonderful machines!
Another great video! Tell all the experts to send you a short video of how it should be done! I'd say most have trouble making good coffee! You are the one doing the repair, you are the one that needs to be comfortable with the process.
The welding videos were excellent - the lower exposure to show the detail of the brazing process works nicely! Gorgeous detail of the stick melting, flowing, puddling. NOT trivial to capture. Always a superb repair!! Thank you Keith!!
Very enjoyable video of a difficult brazing job. While I was stationed with the US Army engineers in third echelon motor pool in Korea I once saw a large diesel flywheel that had been shattered into many pieces, expertly braised together and machined back to serviceable condition. Beside the flywheel was a hand painted sign with these words; “The difficult we do immediately, the impossible takes a little longer”.
My dad was a machinist for GE and I used to pull out metal shavings out of the bottom of his shoes as a kid with pliers. We used to fish at the nuclear plant cooling pond for bluegill and gig frogs. Were still alive but glow at night- a safety mechanism.
Haha
Hello. Thank you for the videos of the Diresta band saw. Are there going to be more or are you done. Would love to see it finished. Thank you.
5:25 ... cordless tools! ... I remember when we only used them when it was just to far away from power, you had to sign them out separately from regular tools and your brought three batteries :) Now? you rarely see extension cords weaved all over a job ... on smaller jobs plug in tools aren't even on the site! :)
I remember taping my company business card to each female male joint in the extension cords travels, so other trades would not unplug my line "just for a quick minute" you could feel the grinder had low power because of a total of, 150 foot 16 gauge extension cords :)
nice repair, Keith. Looking forward to a full reassembly of The Diresta Bandsaw.
Happy Easter. God Bless.
Good tip Keith the table is a huge heat sink! 7:14 I've set parts on top of a very hot wood stove, for a couple hours before brazing ... nice way to preheat
Any more Diresta bandsaw videos to come ?
I agree fully with the advantages of brazed repairs in cast iron. Have repaired cracks in main bearing webs that later withstood racing application (truck pulling). In fact, one of those old GM rat motors is currently powering a medium duty dump truck in the severest climate in North America (northern plains; canada is two hours north at 65 mph). Have no use for nickle electrodes, aside from making finger rings out of them.
Well that’s one I have not seen someone attempt to braze with a rosebud torch. I have a couple times used a cutting torch to braze because the mechanic truck I was using did not have any optional tips besides the cutting torch. Nice repair sometimes one just has to be flexible and McGiver compromise to get the job done with what is available. 👍
When I had brazed in the past I always thought of it as trying to make an icicle by controlling the dripping of water and blowing cold air on it. At first it was really frustrating to deal with a job where the bronze would start to flow out of some area I had just filled. It is definitely something you develop a "feel" for and is almost an art.
I've seen people use a piece of graphite, to act as a dam wall, to contain the brazing material.
It's an art.
@@BedsitBob When trying to 'add' a contact to a gold crown or cast gold dental restoration, the graphite pencil is key to helping/saving some build ups.
audio is really good around the angle grinding, voice isn't getting quiet 👍
Any idea when the next episode of this will be ready really enjoyed them so far
Really appreciated the "brazing cam" footage, as always thanks for taking the time and effort of making and sharing Your excellent videos.
Best regards.
You always do great brazing. I think you have made me a believer in brazing. Thanks for the video.
Thank you for the vid. Half a world away and no longer own any gas bottles. Good to see some brazing work. The darker filter allowed a good clear sight to the molten pool. Jim Bell (Australia)
For Aussie hobbyists, it really hurts being raped by (mandatory) CIG bottle rental charges. We could never own them, currently I pay over $200 per year just to rent one D-size bottle!
Now days there are a few cheaper ways of dealing with the bottles, but it's still hugely expensive - especially if you need Oxy, Acetylene, and some MIG and TIG gasses..
This restoration still happening? Great video on your brazing!!!
Video appears to be working well - especially the filtered shots that show the detail - I for one appreciate your skill set :-)
Great Job!
Awesomeness Extreme
This is when Keith should of made his own DIY steel trash can oven on a stand lined with refractory wool and a weed torch in the bottom to heat those big parts. 🤔😉👍
A pit outside and charcoal works a lot better. And after welding yo just put the part back in, Cover it with more charcoal, and cover the whole thing with fiberglass insulation.Stick a piece of sheet metal over it if the weatherman calls for rain,,,,,and leave it until it;s dead out and totally cooled.
I am very impressed that you figureed a way to aim the cameera through your welding glasses! That is quite a complex repair on the cast iron part!
I have picked up old caste iron welding where they built FIRES over the damage and then welded.
It's nice of you to put John Babbit's shaft back together again.
Keith, did you ever finish the Diresta bandsaw project?
Your video on brazing was excellent! Thank you and Happy Easter to you.
Are there more Diresta bandsaw restoration videos yet to be released?
You are an artist with a brazing torch!
Nice job Keith. As usual. Thanks.
This repair, is the one which really shows the difference or reason that bronze will work better than the other types of process repairs. There may be other men that can use the nickle on the electric welder, but this sure does a good repair
Keith- I taught myself to braze at the ripe old age of 13. Worked at a used car lot ( later used as a stage for the movie “ Used Cars”) fittingly? Part of the pay was use of the limited tools that were on site. Got so I could run brazeing rod uphill. Heat is definitely the key. Just right makes it so easy, too cold and it just puddles on the surface, too hot it runs off, just right it really looks like a welder did the deed. Really came to enjoy the process and found it very suitable for joining metals of different thickness and or makeup. Never tackled such a large casting as what you were working with, but the process is still the same, just more flame to compensate for the mass. Great example!
Wow. That looked really difficult to do . Great job as always !!!
Good job thanks for sharing
You might want to see if you can get a flexible ceramic heater you can hookup to an electrode welder.
Helps alot with pre heating parts like this, use them alot when it comes to pre heating thick aluminum before tig welding it.
Lay the heating mat on the firebricks, part ontop of it and then a welding blanket over it and let it soak while you have a cup of coffee/tea.
Electricity is also cheaper then oxy/acetylene in the long run.
that was some great footage of brazing. Love it. please keep the videos coming
good video keith
I have fusion welded cast iron with an red flux and a cast rod, the look of the previous repair look similar to cast weld. Cast weldments have a very sluggish puddle and if the weld prep was not wide enough it will not flow and or fuse in to the bottom of its prep.
Great video Keith, keep'um coming.
Thanks for sharing! Great work.
Really liked the filter on the camera sir. Very nice being able to see kinda the same thing your seeing.
Great video Keith!
Great video work on the brazing.
At a glance, it looks like brazing a gusset between the Babbett-holding part and the "L"-arm that sticks out may be called for to add support.
I'm a long time fan. Since the beginning. I've been digging the Packistani Manufacturing on youtube. I feel like it would be good for you to commentary those vids. tell us what you're seeing. what's good. whats bad. etc.
Happy Good Friday Keith.
Thanks, Keith.
Thanks for sharing
Hiya Keith
Happy Easter, Keith..
Pretty obvious the pattern maker needed the cast-in gusset to be twice as big. I'd even add a gusset after the brazing job.
Happy easter to you and your family. Greetings from germany.
Hey, lots of flux, you are the only one who knows, you were running the torch. Brazing can be a very good method of cast iron repair. Hey Keith keep up the goodwork.
I like the new cameras nice job
so far, the most useful metalworking to me as far as filling in my skill list is adam and the three keiths, my own equipment needs an upgrade, looking for cnc stuff now. the comments on this video have some useful ideas.
looks great !
Happy Easter from Dresden!
Happy Easter from Dresden Ontario!
Happy Easter from Dresden (Saxony) to Dresden (Ontario)! The best wishes to all of you!
Rumor has it Keith is the best brazzer in the country!
The video picture quality is great 👌
In the 1960/70s we used to braze rust under cars we havnt even dreamt of mig and tig. It sure makes you good at filling holes
Yep, I've brazed a lot of car repairs, and you get good at shrinking the panels afterwards. Then again, the steel was thicker and softer back in those days.
Thanks for sharing 👍
Thank you for sharing.👍👀
Thank You !
Job well done👍👍👌👌
22:46 if you sand blast the surface it blends better with the porous structure of a cast piece under paint
You're right. I don't believe a properly brazed job ever failed. Old school techniques sometimes are the best.
I just stick stuff together and hope for the best! In the end it is whatever works for you to get the job done. 😀
Great job as usual and with all Keith's wonderful successes brazing, why would anyone question his torch flame? It only needs to work for him, not any of us.
A needle scaler works really slick for removing flux residue. It also leaves a good peened finish. If done well, when painted, it's hard to tell where the repair is.
For this size weld a finer needle gauge would work best.
The higher temperature of welding tends to cause cast iron to crystallize along the weld. Combined with the higher contraction of the weld bead as it cools, this makes welding cast iron very tricky and often the result is brittle.
love the shows! i personally would make a brace for this part it has failed many times already
i needed this info, and process.. thanks..
It’s like watching the old Batman serials. If you want to see the inside surface repair you’ll have to tune in next week. Outside looks good though👍.
I learned to position the valves on the torch in the downward position, permits adjustment of the flame
19:38 I've used a big box of Vermiculite for this as well .. works pretty good
Bentonite (cat litter) works also.
Tanks for the brazing lesson. Not likely to take place in a shop kept in a kitchen...
ANOTHER GREAT video! thank you - I am curious about that casting with TWO breaks in it. IT seems to be designed as a cantilever, is that right? If so, and I understand this would not necessarily be "period correct" what would you do if you were more concerned with the viability of the machine and "Trouble free" function? (thinking gusset and weld, or ???)
Great job Sir. You did a excellent job on this repair.
I have to say that I would love to see a collaboration with you and Adam Booth, and it seems that the two of you have the same opinion on brazing cast iron.
Hey Keith, any updates on the Diresta bandsaw project? Really looking forward to it
Whenever I work with cast I use insulated heat blankets. Any welding supply store should have some. My experience is more leaned towards welding, but I've had to chase enough cracks that I don't take any chances. A good preheat and post heat is important on cast.
Edit: I posted before you got to the blanket.
Nice job I've done alot of brazing I will guarantee cast iron is no joke
From a voyeur, great improvement in the sound and picture while brazing. I would have liked to see the places you were brazing in regular light so I could interpret the brazing picture. Thanks for the video.
TELL ALL HELLO, GREAT JOB, GREAT VIDEO, SEE YOU NEXT TIME...
So much easier with a Puddle Torch, best thing i ever bought.
4:29 As a Provincially Licensed Millwright and welder of 45 years? I fully agree with Keith here .. (and we do not agree on everything LOL)
Thanks for a truly good video. Very enjoyable. It's appreciated. A couple of random thoughts: On the inside surface cracks I'd have thought to grind them out a bit with a Dremel grind wheel, and, have you ever considered using a Flir gun to monitor the temperature of the piece that you are welding? Just curious....
They make little "crayon" sticks that melt at particular temperatures. You just wipe them on there as you heat, to check what temps the part is up to.
No need for temp monitoring while brazing- you can tell the temp from the color of the metal. The real trick on large pieces is remembering to hit the rest of the casting with a bit of heat every now and then to keep the heat as uniform as possible. Before cooling, I like to post-heat the extremities a little so cooling is even across the part.
Just an idea. Put part in molding sand. After the weld .sand will hold heat. Pull out and cast that sucker .
Fascinating series. One thing that does strike me is how much easier those taper calculations would have been in metric. Obviously, I understand that it was made in imperial so that's what you have to stick with.
Did you open up the cracks and braze them on the inside Keith? Thanks for the video.
And cleaning up the weld leak in the inside - which possibly didn’t matter because it would be buried in the Babbitt.
Hi Keith, any clues in the design/manufacture/use of that part indicating why it broke in the first place.
7:21- Easy to do in a NG fired oven. Get an old one which doesn't require an owner's manual.
10:47 - Brazing well probably took more time to learn than gas welding, stick welding and TIG welding; controlling the heat and the pressure took time to learn.
Repair it then cast a new one or two. It has more than four cracks. Bad shape !
Use it for a pattern and re-cast .Make extras. Hoppy Easter 🐰.
Wonder if babbit material supply scarcity are what's holding up the pour?
Felices pascuas