looking for sharpener for large hole punches

[curlyjo]

I am looking for a tool to sharpen large, up to 1", hole punches. Everything so far stops at 5/8th's. Thanks

Edited January 4, 2024 by Northmount
Fixed title to represent request

[Mablung]

Round diamond files are your friend for such things. So is wet/dry sandpaper glued to a mandrel or dowel.

Search through here for some methods. A good number of posts have discussed this kind of issue already. 

[bruce johnson]

Do the outsides on something with some give. I use a slack belt section on my belt grinders for the very edge. You can duplicate this effect by hand with a piece of neoprene (mousepad) and wet dry paper going through the grits. As advised above you can take the burr off the inside with a round diamond pile or wet-dry on a round dowel. 

[DieselTech]

On 1/4/2024 at 12:41 PM, curlyjo said:

I am looking for a tool to sharpen large, up to 1", hole punches. Everything so far stops at 5/8th's. Thanks

You can sharpen the outside bevel of the hole punch by hand on a stone, belt sander, sand paper or whatever you may have. 

Then you can use a 240 grit tapered cartridge sanding roll to clean up the inside of the hole punch. Just stick the cartridge roll in the end of the punch & give it a couple twists back & forth by hand & your punch will be sharp. 

Also they come in different diameters. These are a 1" diameter at the large end & ⅜diameter on the small end. 

Hope this may help.