Drum sander Chisel Sharpening Jig

[SkinnyB]

So I wanted to get a bit more from both my 3d-printer and drum sander and just wanted to design and print something useful.
I do not have a decent grinder or the space to have one at hand... And to be honest I hate sharpening so If I can utilise one of my existing tools that would be great.

So I designed this prototype jig that creates a hollow grind. Then what I want to do is add a micro bevel. Im thinking on my next revision having a removable wedge that will able to create the micro bevel. Or just a whole new separate jig.

On testing it seemed to work great. The drum is moving away from me which is the opposite to a conventional grinder. This opposite rotational motion try's to lift the chisel if I don't hold it down firmly. I thinking on the next revision i have a hold down of sorts just to stop it from lifting but still allows me to slide the chisel back and fourth.

I tested with 120 grit. My chisels are in bad shape so ill start with something more aggressive and work my up that way.
I have 240 grit that I can go down up to. I have thought about seeing if I can get finer or even a leather strop I think its called.

If I can get them reasonably sharp and then just a quick clean up on a stone ill be happy.

The left side is for straight 90 degree chisels then the right is for my Japanese chisels which I think were 98 degrees.

Just a bit of fun really. My next plan now that I have just chipped my planer blades badly. Is to create a jig for sharpening those. Like the ones where the blades are held at 45 in a piece of wood. I hoping I can do something similar then pass them under the drum sander to sharpen them. We shall see....

 

[Ttrees]

That's pretty impressive what those 3D printers can do!
I imagine though, that you wouldn't want metal dust embedded in the grain of your wood.
Another reason why it may not be such a good idea, is that metal wears your belts prematurely,
and that it also takes a lot of time to grind back close to your primary bevel again, leading to burning.

I find the bench grinder to be a godsend, after using a belt sander for so long,
it literally takes, like an sixth of the time away now.

Be interesting to see what else you make with that.
I was thinking of making/melting up some HDPE for clamp pads, but it looks to be a bit time consuming at the moment.
That looks like it would be handy for that.
How long did that take to manufacture ?

Tom

 

[Bodgers]

With the tight radius of the drum compared to say a 8" grinder, isn't it creating a excessive hollow grind?


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