Anyone ever heard of this thing? "The Double Grinder"

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I'm so excited, I just ordered 3 of them!!!!! :thumbup: :cool: :thumbup:

I thought about ordering the $100 bench grinders and $50 cross slide vise like he did from Harbor Freight in order to build my own, but that wouldn't have been as cool as just spending $12k on 3 of these suckers!!! :D

I'm glad they pointed out that hollow grinding is the hardest part. Cuz see, here I was thinking that if you make something like a fluted handle dagger.... that the handle was pretty damn hard to do. How fast do you think these machines will make the handle for me????

:D
 
A buffer motor hooked up to a wheel that size looks a little fast for me.

This reminds me of The Simpsons, on the episode "who shot Mr. Burns" when they are doing budget suggestions for the school and otto the bus driver says "You know those guitars, that are like... double guitars, you know? (big stamp 'Approved')
 
It seem to me that you could do this with only one grinder. Just jig up a piece of radiused micarta out from the contact wheel. You could mount it like the work rest on a KMG. Adjusting it close to the wheel, turn on the power and bring the blade up from the bottom. One side gets ground, the other is just supported. If the double side takes 7 minutes, this might take 14, but $4K cheaper. The downside is that it would take some time and steel to figure out spacing and pressure. By then you could learn to do it freehand with probably better control.
Chip Kunkle
 
JBS TOOLMAKER said:
I would also think for 4000 those welds would look a little better.
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And maybe it could be made from stainless steel ;). I have allmost dropped doing hallow grinds compleatley. yes there way easy to do but i just like a flate grind much better. the onley exception is on my 2nd Amendment knives, thy look great with a deap hallow grind.
 
I notice he mentioned that "no such machine had ever been invented" but isn't something similar used on production knives to hollow grind them?
 
I have the Gun Digest Book of Knives... publishing date was like '73, and there's a story in there about a small shop using a grinder like this. I'm sure they stole his idea. ;) :rolleyes: :)
 
NickWheeler said:
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I'm so excited, I just ordered 3 of them!!!!! :thumbup: :cool: :thumbup:

I thought about ordering the $100 bench grinders and $50 cross slide vise like he did from Harbor Freight in order to build my own, but that wouldn't have been as cool as just spending $12k on 3 of these suckers!!! :D

I'm glad they pointed out that hollow grinding is the hardest part. Cuz see, here I was thinking that if you make something like a fluted handle dagger.... that the handle was pretty damn hard to do. How fast do you think these machines will make the handle for me????

:D
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What would the vice be used for?

I saw one of these used by a commercial knife company (Buck, I think) on a History Channel episodes about making knives.
 
We have a pair of 5hp bader spacesavers set up that way.

yes its very dangerous!
My brother does most of our blade grinding now and he feels its a waste as he can outgrind it by hand.

Its very hard to be consistant so we only use it for roughing on blades that the hollow is later flat ground off.

Production machines like this have adjusters to move the wheels (hard stones) closer together while grinding rather then feeding the knife into the wheels. The blades are locked onto a arm that moves in and out following a cam. It has mostly been replaced by cnc grinders wth hoppers and autofeeds
 
Hey Vegas Dave :)

I'm not sure if you looked at the link, but I'll just drop one of the photos here to make it easier to see. He's using a cheap cross-slide vise like the one I posted.... to adjust tension, I would imagine. If you look at the top of the machine you can see it plain as day in this shot. :)

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You can also see the VERY similar bench grinders (to the ones I posted from HF) he used. Those aren't buffers, buffers have long shafts to get the buffs/work away from the motor. Mostly the same difference other than shaft length...but still different ;) :)
 
There used to be a guy that went to the OKCA show in eugene that sold something like this for about half the price. IIRC his used two stones and the blade was clamped in a vise and the fed in using a cros slide. he ground blades in something like three minutes. it was all enclosed also so that the user would have to try really hard to ge caught in a rotating part.
 
Nick - I thought the cross-slide was used to move the wheels closer or further apart for different stock sizes. Could be wrong, but it's only on the double wheel side.
 
Hmm..looks like a great way to have a knife thrown in your face if you ask me. Btw...how does he claim it to cut production from 2 days to 10minutes when most well made knives take weeks to make?

The handles alone would take well over 10 minutes, not including the designing, material selection, rough profiling, refining profile, finishing, etc etc.
 
BladefulArt said:
Hmm..looks like a great way to have a knife thrown in your face if you ask me. Btw...how does he claim it to cut production from 2 days to 10minutes when most well made knives take weeks to make?

The handles alone would take well over 10 minutes, not including the designing, material selection, rough profiling, refining profile, finishing, etc etc.
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Who decided that it takes weeks to make a knife well? Anyways, I'm pretty sure the claim was that it cut grinding down to 10 minutes.
 
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