Check out this grinder

Interesting of course. It still requires a positioning in two directions as you move the blade through and a recurve could be some type of headache. Frank
 
That thing looks terrifying! Mother of all pinch points at the top of those two wheels...

That said it looks like a beautiful machine!
 
I agree with Aaron That thing looks the most dangerous grinder I have seen. It could launch a blade upward at an incredible speed. Using a young boy to demonstrate does nothing to change the obvious design flaw. Larry
 
LARRYZ10 said:
I agree with Aaron That thing looks the most dangerous grinder I have seen. It could launch a blade upward at an incredible speed. Using a young boy to demonstrate does nothing to change the obvious design flaw. Larry
Click to expand...

Belt direction is down

so it would force it out.

pinch points at the top of those two wheels
is valid


I think it would be hard to get a good grind though.
How do you keep the blade straight
 
".....I think it would be hard to get a good grind though.
How do you keep the blade straight "

The same way you get an even grind or a perfect plunge on a single wheel machine....practice, practice, practice.
 
".....I think it would be hard to get a good grind though.
How do you keep the blade straight "

The same way you get an even grind or a perfect plunge on a single wheel machine....practice, practice, practice.
 
I remember seeing a similar grinder (I think it may have been a guy making razors) a couple years ago when I first started looking into this addiction. I always thought it was an interesting idea and it seems to creep its way into my head every now and again. This thread seems to be the most recent reminder and it always snowballs into something ridiculous for me somehow... See below where I go into way to much detail on your idea gadgetguy.

gadgetguy9000 said:
Seems like a good candidate for a plate - jig combo, that would keep the center of the blade vertical.
Click to expand...

Since this is somewhat a jig in its own right, I'm starting to think it would be kind of cool to build a sled with a bracket to hold the blade 90 degrees in both planes. Then make a bottom guide with a threaded rod to feed it upwards similar to a mill/surface grinder, only with changeable dies that have the same curve as each of your blade designs. You could grind a LOT of blades VERY fast by just pushing and pulling blades through with one hand and threading it up with the other hand. Probably only makes sense in my head, but that's all that counts!

See, here I go getting crazy on it again.... As for the pinch point, anyone with a welder or riveter could fab up a simple guard to cover the top portion of the wheels and then, voila, no more pinch point. Lower half is the only useful part anyhow.

Justin
 
J.Babody said:
I remember seeing a similar grinder (I think it may have been a guy making razors) a couple years ago when I first started looking into this addiction. I always thought it was an interesting idea and it seems to creep its way into my head every now and again. This thread seems to be the most recent reminder and it always snowballs into something ridiculous for me somehow... See below where I go into way to much detail on your idea gadgetguy.



Since this is somewhat a jig in its own right, I'm starting to think it would be kind of cool to build a sled with a bracket to hold the blade 90 degrees in both planes. Then make a bottom guide with a threaded rod to feed it upwards similar to a mill/surface grinder, only with changeable dies that have the same curve as each of your blade designs. You could grind a LOT of blades VERY fast by just pushing and pulling blades through with one hand and threading it up with the other hand. Probably only makes sense in my head, but that's all that counts!

See, here I go getting crazy on it again.... As for the pinch point, anyone with a welder or riveter could fab up a simple guard to cover the top portion of the wheels and then, voila, no more pinch point. Lower half is the only useful part anyhow.

Justin
Click to expand...

Charlie Lewis made the one for razors. It was very similar.
 
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