Wanna see my big wheel?

12345678910 said:
1700rpm x (2/4) x (14" x pi 3.14)
= 1700 x .5 x 43.96
850 x 43.96
= 47 366
inches per minute




= / 12
feet per miniute
=3,113


just to show the work because sooner or later somebody else will try and caclulate this.
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You got there in the end... just trying to figure out what that is? Just to see if we're paying attention? :D
 
Bruce Bump said:
OK so what size front pulley?
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3113 x 12 = 1700 x (unknown / 8) x (24 x pi)

37356 = 1700 x (unknown / 8) x 75.36

37356 / (1700 x 75.36) = (unknown / 8)

0.29158860996 = (unknown / 8)

0.29158860996 x 8 = 2.33270887973

If MY math is correct :confused:, a 2 1/4 or 2 1/2 would get you really close.

Chris


Thanks Nick for making me look slow. lol
 
HaHa! If I had typed out all the figuring like you did Chris, I'd still be in the middle somewhere. I can type words fast, but the number keys and I are not close friends. ;)

This type of situation reminds me of those days in math class when somebody would ask the teacher, "What good is all this? How am I ever going to use this in real life?!?!?"

Damn it if Mr. Uhlman wasn't right afterall... ;) LMAO

It's a rare occasion though :D
 
I believe Chris Reeve mentioned using a large diameter stone when he was trying to work out the manufacture of the new (very shallow, almost flat) hollow grind on his Sebenza. What he actually uses is beyond me, and I'm not sure he's sharing that info.

Check out a 25 if you get a chance. It's got a really cool hollow that curves with the belly. I don't know if it's possible by hand though.

I'd love to see an example of one of the old knives made with really large diameter stone wheels.
 
Thanks Nick, Chris and Count. You guys should be building rockets instead of knives. I think the 2.5" pulley is the best way to go. This was fun!
 
Rockets aren't very pointy, and I have never seen a damascus rocket, or a rocket with a hamon. :(
 
Bruce Bump said:
Thanks Nick, Chris and Count. You guys should be building rockets instead of knives. I think the 2.5" pulley is the best way to go. This was fun!
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You're welcome buddy. :)

Nobody would want to fly in a rocket I had any part in making... :eek: :D



So how is the tracking with that Bruce?



Ron- I think the short answer is: versatility.

I would like to try grinding on a great big stone wheel to see what it's like. If you put one together, I'd be glad to try it out for you! ;) :D

I've heard lots of stories about guys laying underneath giant stones for blade grinding back in the day, but I don't think I've ever seen any photos or illustrations of that. Most I've seen show a man sitting over top of a wheel (usually about 30-40"??? in diameter) that's spinning away from them.

*Just noticed* Judging by the grinding sludge, this stone must rotate toward the operator.
SheffieldKnifeGrinders.jpg



Looks like Murray Carter has a couple of them---
carter1jpg-5473c3e201fa50ac.jpg
 
Yes it does indeed look like Mr Carter uses the exact thing I was thinking of trying.

I will probably be trying it, I found some stones on the fleabay for $99. And I have been doing all my knifemaking with files and (flat) stones so far. I think it will be easier for me to set up than to save for a belt grinder at this point and time.

-Ron
 
Nick, the tracking is slow to respond but eventually gets there and stays. I'm thinking the domed top wheel should be flattened out a little.
 
ron_m80 said:
I will probably be trying it, I found some stones on the fleabay for $99. And I have been doing all my knifemaking with files and (flat) stones so far. I think it will be easier for me to set up than to save for a belt grinder at this point and time.

-Ron
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Be REALLY careful. Any weakness along the stone or hidden cracks can cause them to become unstable at speed and blow up, sending chunks everywhere. Do a quick search and I think you'll find some scary stuff!!!
 
I was made aware that stones need to breath to be reliable, awhile ago.

The easiest way to get them to blow is load them with non ferrous deposits. Keeping a wheel dressed is important.

All of that would effect my grinds, so my work will suffer before the hazards appear I suspected. Thank you.
 
thats why wen i can swing it mine will be made of AL or steel hub (lightened to shave pounds) and will run belts
 
I've never met Bruce, but I've always heard that he is a very nice person with a heart of gold. I hope he has a sense of humor too!
 

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In case someones missed it , sunray does a steel hubbed 28 inch x 4.44 inch off a similar machine http://www.sunray-inc.com/m9-road-wheel/

Like bruce did , you would have to machine the width .Then make up a hub similar to one used on trailer wheels .

Dunno what the cost would be like or even if they would sell it to you because its current military tech.:confused:

Just thinking out loud ;)
 
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butcher_block said:
Bruce whats that wheel weight and how hard is it to get up to speed ?
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I never weighed it but it's not heavy as it's all aluminum and rubber except the hub of steel. It's geared low to keep the sfpm about where the 14" wheel was so torque isn't a problem. It does coast longer than any other grinder I,ve ever used.
 
I decided to work my way up to a wheel like Bruce's to get used to the grinding a little at a time. Here's what I have so far. Larry


l6sBAB7l.jpg
 
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