Howdy
11-22-2012, 08:36 AM
For those who don't know I am a Presision Grinder at my Job. I grind and Polish Hydralic Rams for Fork lifts. The rams vary from 1" to 3 3/8" in diameter and from 12 inches long to over 28 feet long. We have a tollerance of + / - .0003 ( 3/10ths of a thousands ) from end to end.
Started my day at work yesterday running our big Cincinnati centerless Grinder ( over 28,000 lb machine ). This grinder uses a grinding wheel 24" in diameter and 20" wide and runs at 1064 RPM. The aprox weight of the wheel is 400-600 lbs.
I started out the day running 1 3/4" material and everything was running great. The 8th part of the day was 1/2 way through the machine and all of a sudden "KABOOM!!!!!!!". The part stopped and a error message came up on the computer screen. Upon opening up the guards and the mist rags ( to contain the coolant spray ) I found the center part of the Grinding wheel ( 3 part wheel ) had violently exploded. The explosion and resulting carnage was VERY loud. The boss and group leader came running to see what happened. None of us could believe what we found. The boss took some pictures and printed a few out for me. It took almost 7 hours to replace the wheel and to fix the damage enough to get it back up and running. I ended up working over 4 hours just to try and get caught up on production. We run a on time delivery style set up.
In these pictures. The main cover that protects the wheel / operator is 1/2 thick steel with a 3" lip on it ( 1/2 thick ). You can see in the one picture that in less than a blink of an eye the cover was bent. Oh, and the grinder went from 1064 rpm to dead stop in less than a sec.
The Picture of the whole machine is a machine that is Very simular to the one we have at work. It's just the basic machine ( same model ), It don't have the outriggers, rollers, control panel, and such.
I am VERY Thankfull today as things could have been a lot worse yesterday.
Howdy
Started my day at work yesterday running our big Cincinnati centerless Grinder ( over 28,000 lb machine ). This grinder uses a grinding wheel 24" in diameter and 20" wide and runs at 1064 RPM. The aprox weight of the wheel is 400-600 lbs.
I started out the day running 1 3/4" material and everything was running great. The 8th part of the day was 1/2 way through the machine and all of a sudden "KABOOM!!!!!!!". The part stopped and a error message came up on the computer screen. Upon opening up the guards and the mist rags ( to contain the coolant spray ) I found the center part of the Grinding wheel ( 3 part wheel ) had violently exploded. The explosion and resulting carnage was VERY loud. The boss and group leader came running to see what happened. None of us could believe what we found. The boss took some pictures and printed a few out for me. It took almost 7 hours to replace the wheel and to fix the damage enough to get it back up and running. I ended up working over 4 hours just to try and get caught up on production. We run a on time delivery style set up.
In these pictures. The main cover that protects the wheel / operator is 1/2 thick steel with a 3" lip on it ( 1/2 thick ). You can see in the one picture that in less than a blink of an eye the cover was bent. Oh, and the grinder went from 1064 rpm to dead stop in less than a sec.
The Picture of the whole machine is a machine that is Very simular to the one we have at work. It's just the basic machine ( same model ), It don't have the outriggers, rollers, control panel, and such.
I am VERY Thankfull today as things could have been a lot worse yesterday.
Howdy