Grinding on the Side of the Wheel?

[RobWilson]

??? Themit / Thermite use's iron (III) oxide,,,,,,,, ( Fe2O3 + 2Al → 2Fe + Al2O3 + heat) So it should use the suffix ate for more/lots of oxygen ,,,,,,,,, Thermate ;D

Rob

 

[tel]

;D Yeah, that makes sense. After all, we use ammonium nitrate to provide oxygen for a certain (ahem) 'procedure'. And potassium nitrate for another. Some'ow 'dynamate' doesn't sound quite right tho'.

 

[RobWilson]

;D Yeah, that makes sense. After all, we use ammonium nitrate to provide oxygen for a certain (ahem) 'procedure'. And potassium nitrate for another. Some'ow 'dynamate' doesn't sound quite right tho'.

Rof} Rof} Rof} Rof} Rof} 'dynamate' I think they sell that on QVC :big: :big: :big: :big:

Better get let this thread back on topic :hDe:

Rob ;D

 

[steamer]

AHhh Lew beat me to it....ringing a wheel and standing to the side during the first minute is standard practice in the machine tool business...

With a 5 pound wheel, 8 inches in diameter, going at 3600 rpm, you have about 700 joules of kinetic energy. Converting that to linear kinetic energy....as it's easier to "relate" to..

That's 5 pounds of razor sharp rocks flying at you at about 60 miles/hour

Now there's an image to think about.....

Dave

 

[Woz]

I've been reading this thread with interest. Do the warnings about grinding on the side also apply to those drill sharpening jigs that work that way?

Woz (in Oz)

 

[steamer]

That's an interesting point....and I have not used one of those grinders....but if it's a "Standard" bench wheel...then I would have to say yes!....regardless of the fixture.

Lets face it....I know I have done it so I'll throw no stones most here have.....but in general you shouldn't for reasons already stated....


And for god's sake as well as your own..wear Glasses! 8)

Dave

 

[steamer]

This might help...


[ame]http://www.youtube.com/watch?v=2pDL0ZQ-2Pk&NR=1[/ame]




Dave

 

[Dan Rowe]

Dave,
I had to play the video because I have never heard a bad wheel. I think the videos are a bit of a ringer because he holds the wheel properly by the center hole in the first good test and for the second bad test he has what looks like the same wheel sitting on the bench which is not how to conduct the ringing test.

Dan

 

[Lew_Merrick_PE]

I've been reading this thread with interest. Do the warnings about grinding on the side also apply to those drill sharpening jigs that work that way?

Woz,

The old General brand drill sharpening jig came with a warning to purchase a side-load grinding wheel for use with it. My own General drill grinding attachment was purchased in 1968, so I am bit out of date as to what warnings come with them today. When Pacific Grinding Wheel went out of business, I purchased a box of 72 side-load wheels from them. I assume, but do not know, that such wheels are still sold.

 

[steamer]

Thanks for that info Lew.

Dan, I'll take the second one down, as I don't want a staged one

Suffice it to say that if you don't get a distinct ring, you don't have a wheel

Dave

 

[Dirty_Vinylpusher]

Yeah lots of good info here.

On that note I'm gonna scurry off and clean up all the dust around my grinder..... Thm:

 

[TonySteamHobby]

I dropped a running 4” angle grinder once. The wheel hit the concrete and broke into a lot of pieces. They flew all over the room. Somehow, they missed me, but it still left my heart pounding.

 

[kwoodhands]

A bit off topic but still about grinders...


Has anyone heard of/experienced a chemical reaction/fire/minor explosion when grinding both steel and aluminium on the same grinding wheel?

???


(Not as in grinding both materials at the same time, but one after the other.)

I grind aluminum on a 2x42 belt sander. If I had a need to grind on a flat surface the belt sander is my choice.

 

[L98fiero]

I grind aluminum on a 2x42 belt sander. If I had a need to grind on a flat surface the belt sander is my choice.

Good choice... until a sharp edge catches the join in the belt, been there, done that!

 

[Richard Hed]

Good choice... until a sharp edge catches the join in the belt, been there, done that!

LOL, I am an instructor, and I tell my students when they break a tool that that is what learning is all about. Who hasn't broken a tool? One student did exactly this, ripped the belt! Unluckily, we didn't have a replacement belt, but the ript belt was still usable by about half of it.

Also, I have a friend who turned on a stone grinder, which blew up and hit his shoullder. He was in hospital for 3 months! I tell my students that when they turn on a stone grinder, to stand to the side and make sure the path of any flying pieces would not strike anyone in the way. Also, (as students) I have them yell "CLEAR!" to notify all concerned when starting a stone grinder. In any real shop, no-one would do this, but it's to get them to be aware of the fact that 1 out of a million starts will be an exploding wheel.

I had one of my Spanish speaking students write a note to place on the grinder: Do NOT EVER grind aluminum or other non-iron pieces on this grinder. Also in Spanish. I also explained WHY not to do this.