Belt Grinder belt speed question

Last comment then I'll let it go:

If it is a 4 1/2" grinder, you have added one more safety problem by putting a 7" flap wheel on it. Hand holding the work piece while putting it against a fixed flap wheel is just about as dumb as the whole setup.

Additionally, a grinder is designed to be firmly held by the handle and the main body. This places all the stress up the shaft of the disc. Attaching it to a stand by just the handle or a bolt in its place places all the stress on one spot....one it isn't designed to be at......which could easily break the casing.
 
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Stacy E. Apelt - Bladesmith said:
Last comment then I'll let it go:

If it is a 4 1/2" grinder, you have added one more safety problem by putting a 7" flap wheel on it. Hand holding the work piece while putting it against a fixed flap wheel is just about as dumb as the whole setup.

Additionally, a grinder is designed to be firmly held by the handle and the main body. This places all the stress up the shaft of the disc. Attaching it to a stand by just the handle or a bolt in its place places all the stress on one spot....one it isn't designed to be at......which could easily break the casing.
Click to expand...

Stacy, it'll all be good? ;)

It's worked till now, it can't be all bad. ;)

It works like a charm! :)

It's surprising when people can't read max rpm warnings on things. What sinepari has done, is a big no no. Bigger discs should never be placed on smaller grinders.
 
Stacy E. Apelt - Bladesmith said:
Last comment then I'll let it go:

If it is a 4 1/2" grinder, you have added one more safety problem by putting a 7" flap wheel on it. Hand holding the work piece while putting it against a fixed flap wheel is just about as dumb as the whole setup.

Additionally, a grinder is designed to be firmly held by the handle and the main body. This places all the stress up the shaft of the disc. Attaching it to a stand by just the handle or a bolt in its place places all the stress on one spot....one it isn't designed to be at......which could easily break the casing.
Click to expand...

The handle doesn't thread into the grinder as deep as the bolt. I'd say that the bolt threads into the grinder an additional 1/2" further than the handle. This is a tired grinder, it's specs weren't that great to begin with. I'm not negating that it's less than adequate and lacks in the safety department, but as a temporary get-by tool, it fulfills my needs in the short term. *** I'm retiring it due to new equipment...

PT Doc said:
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Stacy, it'll all be good? ;)

It's worked till now, it can't be all bad. ;)

It works like a charm! :)

It's surprising when people can't read max rpm warnings on things. What sinepari has done, is a big no no. Bigger discs should never be placed on smaller grinders.
Click to expand...


It's a flap wheel disc threaded onto an arbor. It's not a cutoff wheel that could shatter, bind, or explode... The worse possible outcome is that I kill a grinder that's half-dead to begin with... I don't think Stacy needs someone parroting what he's already stated... If I were reading this as an curious onlooker, I'd side with his advice...

The only person using it is myself, I'm not jeopardizing anyone else's safety... No need to be pompous. There is an inherent risk in all things, just because people make the decision to do things that you would not doesn't make them stupid....
 
What works for me is a burr king knife maker variable speed grinder, i like to start out fast for the starting grind with a heavy grit belt . as my grind starts taking shape , i slow it down and reduce grit size on my belt as i get close to what i want i am down to 220 grit. and maybe running at about 25% of my max speed. It just makes my minor mistakes smaller, it takes a little longer but for me its worth it , I have used many styles and types of grinders , this is my first variable speed. It has saved my scrap barrel from over filling many times over the years. If you intend to make more than a few blades this is something to consider. also a band saw is worth the cost in both time and safety when cutting out your blade.
 
Sinepari, now I am hurt. After being called Stacys pompous parrot, I am taking my ball and going home. :)

The reasons for the comments are this. You might be a genius or you might be a moron. I simply don't know. You have created a contraption that has so many things wrong with it. There are so many newcomers to this site that have zero metalworking experience coupled with no budget. If there was no safety commentary on your design then it almost seems that it is deemed to be safe. This could lead someone lacking skills to create the same grinder setup and injure themself. If it works for you and you know what is wrong with it, then by all means continue using it. It didn't seem like you prefaced your photos with comments admitting to the lack of safety in your design so the comments were there to be helpful not kick you in the nuts and try to shame you.

Peace at you.
 
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