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Slow Grinder Problems

2K views 13 replies 10 participants last post by  TomHintz 
#1 · (Edited by Moderator)
Morning, So, I purchased a used Lathe and it came with many tools. Of course the tools were dull, so I purchased a slow grinder. Day one I took a chip out of the wheel , it appears to be too deep to flatten to make it flat again. Can I still use it safely in it's condition ? Thanks for any help… Kirk
 
#6 ·
Thanks, I can see no noticeable vibration as the chip is small. I would flatten it but it's on the side and goes down aways . I probably an 1/8 " into the surface. Again and always thanks for your valuable feedback, time to go to woodcraft and bite the bullet….Kirk
 
#7 ·
I seen with my own eyes what using a chipped grinding wheel can do. I used to do industrial mechanic work. We had a grinder with a chip out of the wheel. It was about a quarter inch square and about an eight of an inch deep. Management put a sign on it stating not to use it, that a new wheel was on order. Guess what guys. Sometimes chipped wheels are an indicator of further damage that is hard to see on a grinding wheel. One of the other mechanics decided he knew better than management. To make a long gruesome story short, he lost all of his front teeth and all of his upper lip and most of the left side of his bottom lip had to be surgically reconstructed using skin grafts.
 
#8 · (Edited by Moderator)
"I would flatten it but it's on the side and ….."
First and foremost : You're not supposed to grind on the SIDE of a wheel !!!

Is it actually a missing chip , or did you gouge it with your tool ? If the chip flew off with no contact from you , then you should replace the wheel immediately as it is defective. Be safe , not sorry : )
 
#9 ·
It's a slow grinder so the wheel won't explode. The only question is what effect will it have on sharpening, and if you stay away from it the answer is none. I had a divot in my wheel about 1/3 the width extending almost 1.2 the diameter and used it for 2 years on stuff as wide as the wheel. The part ofr the tool resting on the healthy part of the weel won't let the tool catch in the divot; you'll just feel a little click. Just watch what you're doing and when you can, replace it.

Steve
 
#11 ·
If you consider one thousand seven hundred and twenty five revolutions per minute to actually be slow , then go ahead and take your chances….that's almost 30 revolutions per second…How fast are you ?
Bet you'll be hurtin' before you can even say DAMN !!!
 
#12 ·
I would say it depends on how slow is slow and how deep is deep in relation to the overall size of the wheel. Pictures would help a lot with providing a true assessment. If you can turn it slow enough to flatten it out, I would say go ahead Is the wheel attached directly to a motor shaft or is it belt driven? Directly mounted, you won't get it slow enough to do it safely. Belt drive is a different subject. Since you say it can't be flattened, that makes me wonder how deep it really is.
 
#13 ·
I think he needs to clarify whether the chip is out of the side of the wheel as stated above , or on the edge of the grinding face and travels down onto the side from there. Pictures would be a great way to show this : )
 
#14 ·
If it is one of the 90-rpm slow-speed grinders, the chances of it coming apart bad enough to throw anything is remote to say the least. If this is one of the 1750-rpm machines, the safest thing to do is scrap the wheel.
If the chip is to the side as often happens, you can keep the remaining surface level and use that and let the natural wear bring the surface down to the level of the chip. It really depends on how big the chip is. maybe posting the type of grinder, it's rpm and dimensions of the chip would help.
 
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