Exploding grinding wheel 😵. Repairing damaged live center.
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- Опубликовано: 15 окт 2024
- This week we repair a damaged but very well designed live center that was about to hit the trash can. We also have a very close call when one of my grinding wheel comes apart at 3600 RPM. Thanks goodness for wheel guards. You can do all the safety checks and try to do everything to the book but sometimes stuff happens. Stay Safe.. Happy Holidays
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My dad provided for our family as a machinist/tool & die maker. One day in the mid 60's, I was already home from elementary school and he surprised me by coming through the door much earlier than he normally would. He simply said, "You came really close to becoming an orphan today." Someone had changed a belt on the tool post grinder to the high speed position and my dad did not realize that he was not the last one to have used the lathe & grinder. The wheel lasted just long enough for my dad to understand it was spinning too fast. There was no time to shut the grinder off before the wheel exploded. He was bruised badly on his abdomen. His first reaction was to use his military training to treat himself for a possible chest wound, expecting to have a punctured chest cavity. Thankfully the injury was not a penetrating wound and we were able to have him with us until he passed at the age of 91. RIP Sam
This bloke is the Bob Ross of metal work
loading the stone up like that is usually unlikely to end well . Bloody lucky you had that guard ! Good warning for a lot of untrained hobby guys getting bigger machines , they bite & rarely give a second chance .
OMG YEEESSS that bearing setup is what you get when engineers are told "this has to be rigid but still move easily and yes also adjustable no compromises"
@@ralphgesler5110 the pnly time something is "over engineered" is when the functinality built in hampers the ease of use of the tool most multi tools walk this line
made in germany...
The Bob Ross of machining keep up the excellent content 👍👍👍👍👍👍😁😁
You know it's a good video when they pull out the "Old Spice" 🤣🤣🤣
When I was in the trade school phase, machine shop 101, an old guy came in to tell the story about his clothing getting caught in the lathe. Pulled him in right quick. We all rolled our eyes as kids do. Then he took off his shirt to show us the scars. These days I’m fairly safety conscious. So glad you’re ok Steve! Would you consider pulling out the hoodie strings? Happy holidays! ❤
This guy is the Bob Ross of Machining.
Underware changed....Very This Old Tony-like. I like that.
It scares the scrap out of me seeing people not showing grinders the respect they deserve/demand. That wheel guard you made is worth more then any other item in your shop. Merry Christmas to you and your loved ones.
And to think that wheel wasn't even a high speed wheel...imagine one that turns much faster coming apart in your face!!!!
A very relevant illustration of what can and does go wrong. I had a tool post grinding wheel shatter in almost identical circumstances a few years ago. Ring tested it and it shattered shortly after I had applied a slightly heavier load than normal. The broken chunks of wheel wedged and shattered the cast iron guard and pieces of wheel and guard hit me in the face and broke my safety glasses. I got a lot of facial bruising and lacerations and a fair quantity of wheel fragments in the left eye. I was working alone at the time and had to switch off and then grope my way to the house and first aid supplies. It was not fun. My left eye took over eighteen months to get back close to normal, which wasn't great to begin with. I consider myself lucky to have only suffered minor permanent damage. I strongly concur with Steve's advice re guards and standing out of the line of fire. I now also wear a face shield when grinding as it seems to be a natural human action to unconsciously align oneself with the grinding wheel.
Merry christmas and stay warm!
All the best for 2023 to you and yours Steve. Is it ever nice to work with a bench vice that has been cared for. All too often they have been beaten to death or worse. It is a rare thing when one of these stones that are designed to handle some side pressures come apart like that. Defiantly a tightener of ones toosh for sure. Side grinders that have been dropped are a different story. I have an one inch scar on my L knee from one of those. The belt did bring memories of me taking one of my Mary's plain cowboy boots for a needed seal repair. Even the new pair I acquired to replace it was met with distain, LOL. I am sure glad you are ok. Now you have a live center with lots of tool clearance for the tight fitting insert holders. Time well spent. Take care eh.
Safety equipment saved you that day Steve, others have correctly diagnosed the cause, every day a school day, remember to wear the school uniform.
Nice refurbishment.
Thanks for sharing
Dang! Steve,
Having read the title, I was watching for it as soon as you fired up the grinder.
& I still damn near needed a change of shorts myself.
Glad that's all you needed.
That's a great reminder everyone needs reminders for situations like this because it's better for one people to tell the story so others don't have to and I mean others with "consequences"
You did a great thing showing people that guard you made it may make them be creative and buy or build something their own and use it. 👍
One of the dangers of grinding without coolant. I have had similar happen to me. What happens is the work gets to the point where the heat makes it rapidly grow. With the work growing and the wheel growing it grabs and boom. The 2 times I have shot parts out of my surface grinder that is what happened. It is what made me change my coolant nozzle so that I was always getting the coolant to the grinding interface. Before on small parts which are the worst about changing size it just kind of sprinkled on the part as it passed by but really wasn’t cooling while the grinding was happening. Glad the incident was not too bad.
Glad you added this in a comment. I will put this in my memory bank for sure. Best too you over the Holidays Brain.
I considered heat being the issue but wrote it off due to not having ground but a very short time and it cutting free. It very well could have been heat build up and part growth. Very good point.
I don't know what happened unfortunately . I think it may have been a combo of both the wheel having a weak spot that me ringing it didn't catch and heat 🤔 .
Hope you are having a Merry Christmas and staying warm.
That cold start video you did was pretty good. If that rig will start at these temps it shouldn't ever have issue 😄👍
Cutting a radius with a grinding wheel introduces a side load to the wheel, which is one of the most common causes of grinding wheel failure. There are "cup" and "dish" wheels designed for a side load what will make this operation much safer. Having the correct wheel around for this type of operation may seem costly but well worth it for safety. I am glad you use guards - always a good call. Whenever side wheeling I always wear a safety face shield- save me more than once.
Hope you and Elizabeth have a very Merry Christmas! May God bless you and your family in the year to come!
I am glad you did not get injured. It warmed up to zero degrees today. It was -12 here yesterday. The wood stove in the shop was struggling to get the shop temp higher than 50.
I See 🐶 Puppy Got Gelis when you started spreading the Strawberry 🍓 Jam on the Bearings..
Beauty! Teterboro is said “Teeter-burrow” in case you were wondering.
I like the way you use your brain instead of your bill fold to fix things. A good lesson for all.
Sheeesh guys we can "armchair" that wheel forever... It happened, and things do happen often too FAST to react...
He was prepared for the unexpected ! He built a guard sometime in the past out of Schedule 80 ! ( do any of us have schedule 80 guards ? I'll be looking at ALL of mine and thinking about upgrading.)
Secondly he LEFT that in the video so we can ALL pay attention and learn in our own shops !
KUDOS Steve !! and
Merry Christmas to you and your family including all the furry ones too !
I had a 10” grinding wheel on a pedestal grinder explode on me a couple years ago. Still have a nice scar on my leg from it. A piece went clean through my shop pants. Big chunk of the wheel hit my steel toe boot. Pieces of the wheel went everywhere in the shop. Made a believer out of me. I do my grinding on a belt grinder when at all possible.
Its amazing what a little time and care can do to keep something working like it was designed to do. In this throw away world of to day its nice to see someone take the time to keep things working.
Merry Christmas and Happy New Year to the Summers family!!
Merry Christmas Steve, Noel, two- and four-legged kids! Thanks for this year's entertainment.
Wow… great that you had that guard!!
Thanks for sharing...well, the video but not the storm. We didn't have more than flurriies but did have a tick bellow zero yesterday and right at zero this morning. Good save on the center. Greg
Merry Christmas Steve, Elizabeth and family. Y'all take care.
Hey hey :) there is a new video up! I was already sad that this weekend is christmas,and we might not get a new video. Thanks for posting and merry merry christmas to you Steve and your whole family.I hope you have some wonderful days.
Stay warm. Be safe. Merry Christmas.
Merry Christmas and Happy New year to your whole family.
another great video Steve thank you
Thank you for sharing. A Merry Christmas and Happy New Year Steve and Family.🌲🌲🌲☃🎅☃🌲🌲🌲
As a retired safety advisor and engineer in the UK, I get very frustrated with the number of You-tubers that set a bad example to non-professional engineers by using angle grinders without the guard fitted. I hope that they learn something from your video and realise s just how dangerous grinding wheels can be. You set a good example of the care needed, examining and ringing the wheel and the use of a guard
There is a reason I refer to them as DOOM wheels, I always treat them as they are trying to kill me.
Most of the guys are using angle grinders like if they had universal healthcare. 😬
@@motivatedpeon no amount of universal healthcare can help a bloody great hole in the head lol
I am a retired engineer as well and I could not agree with you more!
ok safety sally
Merry Christmas Steve and family, stay safe, stay warm, have a good time, best wishe's to you all, Stuart Uk.
THANKS STEVE MERRY CHRISTMAS AND STAY WARM.
First time I have ever seen a grinding wheel come apart = SCARY.
Merry Christmas and have a great new year to you and the family.
Thanks Steve - the exploding grinding wheel is a good lesson for all your viewers! I'm pleased that the temperature today in south west England is 52 degrees F! Merry Christmas to you and your family.
In my safety video. Exactly that. Same thing happened. Norton disk.
Merry Christmas to you and Elizabeth. And a happy New Years.
Good morning Steve! Thanks for sharing and Merry Christmas to you and your family 👪
Best practice would be if you go back and regrind that 60deg point to the center line of all the bearings it naturally spins on while assembled. To repoint live centers we rarely disassembled them. We would use a 3/16 thick O-ring near the body as a belt on the exposed spinning member to slowly spin the center while sparking out against the grinding wheel. That could often make even cheap live centers better than new with zero detectable runout.
Better bury them grunders too. Those stains will never come out! 🤭🤣
Somebody like Steve, would compulsively want to disassemble, clean and re lubricate this potential trash bin center, discovering what made this Live Center "tick" before attempting any regrind.
That safety fender saved your ^$$. I literally know people who remove those guards on there grinders. Thanks for not editing that out.
Merry Christmas and Happy New Year to You and Your Family Steve.
The guard worked very well.
Merry Christmas! Looking forward to new adventures in '23
You are the poster child for why people despise hands!
Ok
Happy New Year and stay safe
Phew thank goodness for the guard. Looks to me like increased diameter due to the taper, applying too much side stress to the wheel. But I'm in my living room in England and you were the one observing.
Merry Christmas to to all in kentucky
Thanks for another good video. Good reminder for being safe. Merry Christmas: George from Indiana
Although I knew it was going to happen, I nearly jumped off of my chair when that wheel came apart. I'm glad it ended well. The centre came out very well. Thanks for the video and thanks for thinking of the animals in the extreme cold weather.
Wow. Nice work sir
Nice video Steve. I hope you are getting Elizabeth a new belt for Christmas. Happy Holidays to you and your family.
Nice center Steve and nice work saving it for continued service. Keep up the good work, Al
Birds and the furry denizens of your forest would also enjoy a nice bit of suet and nuts as well with that cold, plus some shelter as well, in the form of some nice boxes out of the wind to huddle in.
Hmmm. A how-to for a making a non-welded wheel guard for the typical stripped garage sale grinder might have wide interest. Glad you showed that near disaster!
Wow ,I really never saw a grinding wheel explode! I'm sure the numerous safety experts on this channel have their own explanations and admonitions on how to use grinders and tools (after the fact of course) You were totally honest showing the scene which you very well could have cut out.Glad you are ok and you've probably figured out what happened and moved on.Have a Merry Christmas ,Steve!:)
Not being but an old man with neophyte machining experience, especially with grinding equipment, the old timers always told me to never load the grinding wheel in two axes (directions) at the same time. I.E. cut the longitudinal to diameter before trying the radial cut-still scary. Those old hands had seen it all. Cheers!
@@geoffmorgan6059 That makes a lot of sense, especially after I had to think on it-and especially maybe little bit too much load from side -perhaps turn work for 'front on 'grind.
Good case for the guard!
I wish you and your family Merry Christmas and Happy New Year. Greetings from germany.
Merry Christmas Steve & family and Happy New Year!
Miss seeing the other dogs...
Even expecting it, I still jumped. I had a 1/2" carbide endmill explode into hot little shards on me a couple of years back and ended up with a chunk embedded in my head and some dents in the safety glasses. These machines have a way of reminding you what's what.
Thanks for the safety reminder, glad to see nothing but your shorts got injured. MC&HNY
Merry Christmas and a Happy New Year happy Hanukkah and may you and yours have a wonderful time
Merry Christmas 🎄👍👍😎🎄
Merry Christmas to you and your family!
When the Old Spice came out, I automatically whistled the theme song. When I left for work Thursday morning, Dec 22, 2022, it was -8F with the wind blowing about 20 MPH. Brrrrr!
Whoa! That was an eyebrow raiser! Happy Holidays to all the Summers young and old. Stay safe and thanks for all the entertainment!
Very nice visual demo on the bearing !
Man I jumped when that wheel broke! And I'm sitting way over here, LOL! The slo-mo really showed the importance of a wheel guard. Glad you are safe! Merry Christmas! ⭐🙂👍
For your neck of the woods that’s pretty cold. I live ND we had -34 F and -57F wind chill. Stay safe.
Good stuff
Just the other day I was doing the lawns. I was not using a catcher because the grass was tall, but I was wearing eye protection gear as I always do. At some point the mower caught some loose dirt and flung it and hit me in the leg. I had overalls on but it was stinging painfull. A point to consider is the ricocheting debris have turned an angle, are still fast AND NOW SPINNING, so I strongly advocate a full face shield when working on any grinder.
Your grinding stone must have developed a hairline crack because of the temperatures hot with the heater, and then very cold cycles in the shop over time. And, when you were moving the work left to right the stone wheel was overloaded with impulses and the crack just gave in.
Great Repair..
Merry Christmas..
I caused a grinding room panic early on in my apprenticeship staying after work to true a new set of tires mounted on my 1/24 slot car rims. Had ground a CRS drop piece square on bottom and a corner adjoining then drilled and reamed a .250" diameter hole to press .125" dia SKF pair of precision ball bearings. Ran each threaded wheel rim on the axle ends locking against a nut. Went to a Boyer Schultz surface grinder, placed the block against the fence, turned the crossfeed down and wheel to just clear the tire. Then turned the switch on while holding the front rim/tire with my left hand gently cranking the down handwheel to just touch the tire on the opposite side. A slight rotation by my left hand produced a smooth radius on the tire! Success!
I then released the tire to get another grip to continue the radius. There was an immediate vacuum cleaner sound as both rims with 1 1/8" dia tires accelerated to very high rpms growing to 5" diameters as they came off the rims only to bounce off most of the walls as the night shift boys ducked for cover!
I improved the fixture by replacing the nearest rim/tire with a little crank handle and trueing the tires on an ax!e in 2 operations or a set in 4 operations. My tire diameters were +/- .002", had the smoothest car on the local track.
Merry Christmas to you and your family
Thank God that you had a wheel guard Steve. That was almost a really bad day
Railroad adjustable wrenches make the best adjustable pin spanners. Drill and ream holes in the side of the jaws. I have several size wrenches with several sizes in each.
I thought to myself I wonder if Steve has posted a video yet, pull up my subscription page... Nope okay I'll watch something else. Clicks another video, notification pops up. Now I'm watching your video. Sweet!
Merry Christmas to you and your family happy holidays
Good job. I had a 14 inch wheel come apart. It flew 100 feet across the shop and went thru a wall before it stopped. Not fun.
7:49 If you slide a heavy case or crate down a staircase, do it at a slight angle to prevent it bumping every step - a similar principle!
Happy Saturday Christmas Eve Steve, Cora, and Grits! Always informative and inspiring. I have become a much better amature machinist because of you and other U tubers. Merry Christmas to you and your family. Your guift to all of us is beyond measure. God Bless!
Merry Christmas 🎅 🎄
-10* here yesterday plus 35-40 wind gusts. cold is not the way to describe this weather. merry Christmas to you and family.
Merry Christmas and Happy New Year to you and yours!
Great video/discussion and yikes!!!
Happy Christmas to you and your family Steve.. you have a great channel, been following you for years now.. Glenn 🇬🇧🇬🇧🇬🇧
Thanks!
Thank you very much for the support. We all appreciate it
Steve- You were side-loading the wheel. By the sound, I knew you were using too heavy a feed, and my gut tightened up instantly. Then BAM ! Side wheeling is quite dangerous. Only use the lightest of feeds. And LISTEN to the wheel. Now you know the sound, right before the super nova. When the wheel sounds, tingy tingy tingy, then STOP and go super easy with the feed. Glad you are OK, and now you know how the wheel acts and what to listen for. I do side wheel occasionally, but it is as dicey as walking an I-beam, 100 feet up. I am NOT a safety Sally, but I do pay attention to the important points, and grinding is one of them. Peace. -----Doozer
Wasn't side wheeling. Table was locked tight . You can see me locking it before I started grinding with that wheel. 👍
@@SteveSummers If you are using a radius dressed wheel, straight plunge infeed puts a side load on the wheel. This is the case, unless you have a full 180° radius where the side forces balance and do not create a side component force when doing a straight infeed. You do not have to feed the wheel sideways to allow it to encounter sideways forces. A radius dressed wheel is a good example of this.
Sounded like the wheel started to load hence a heat build up. What material was the arbor bushing, lead or plastic?
Did years of surface grinding but the boss removed me after the required 2 weeks on our 24 inch Landis cylindrical grinder. I kept raming the convenient mounted diamond dresser through the oil level sight glass lense, my focus was in the feed and grinding areas.
Sweet video!
Steve I think the reason your grinding wheel exploded on you is because you're climb grinding, in other terms the center of your wheel is below the center of the part you're grinding. Under those circumstances if the wheel grabs on the part, there is no room for it to go anywhere. Similarly to what you do when you dress the wheel, you never put the diamond dresser before the wheel but always ahead of it. I think the fact you where actually form grinding with a large surface area to grind increased the forces to the point that the wheel tried to climb, and as soon as it happens things get worse and worse. Glad it didn't happen with the second wheel but I wouldn't be surprised if it happened again. Good job on the regrinding 👍
Wheel breakage is no joke.Where I worked in the 1960s, 1 man injured, 1 man dead in separate incidents of cylindrical grinder wheel breakage. Both were attributed to drive dogs coming loose. Each happened in a split second. Both had wheel guards in place. the death occurred when the machinist was struck in the head by the work part and arbor. The injury was to the shoulder and arm by a diesel engine camshaft.
Hey Steve, very nice job to saving a very nice piece of machinery. Both my Dad a his brother where excellent machinists and toolmakers. I learnt a lot from them and still love watching skilled people like you saving old but beautiful tools! So happy you are caring for safety also! Take care and have a pleasant time with your family 👋
Changed JUST the underwear not the pants too? Respect. 🤪 I'm glad you had the guard. There is no need for another channel to sell "Just put a thumb in" T-shirts! 😬
Happy Holidays for you and your two and four legged family!
Respect your equipment. Doesn't matter what you're using. Abrasives let go. Wheels shatter. Parts get pulled out of the vice. Saws will kick back. Power tools will bite you if you're not careful or act like a ding ding. Don't put yourself in the target line if at all possible and respect the spinny bits. My story about shop safety went like this.
I had an ax bite into a polishing wheel, and the wheel kicked it into my face. After an ER visit, 7 stitches, and a concussion I a lot more careful. My safety glasses saved my vision, and probably my life by deflecting the ax head just enough it hit on the flat, and not the edge.
It was not a fun day.
Be safe out there this weekend and Merry Christmas.
Always have to look at any job from the perspective of the worst case scenario failure, and then act accordingly. IOW, what might happen if the SHTF. Might save your life…..
Ouch, scary! Circular grinding gives me chillings...
I had a bench grinder wheel burst at work and I can confirm that my underpants looked like the starting grid at Brands Hatch. Not a pleasant experience.
Merry Christmas from Dean at Retromeccanica, Oxfordshire, UK.