How would I sharpen this blade with internal v-shape?

H

Hydrazine

Joined
Jun 13, 2017
Messages
3
Hi folks,

I have this blade that is actually used on a wire cutting machine - I have tried to sharpen it but I am not having success because of the internal v-groove. When I use a stone, the base of the V gets turned into a rounded shape. That's a problem because this is the part where it actually cuts the wire.

Is there some sort of very sharp cornered cutting tool that will produce this V shape? I'd like to be able to sharpen these myself rather than having to send them out to be sharpened.

wirecutblades.jpg
 
I might be off base (I know nothing about what you pictured)... but what is opposite of the piece you pictured? What's in your picture looks more like a guide... just wonder if what is opposite it does the actual cutting?
 
I would keep sending them out... probably sharpened on a grinder specifically made to cut that shape.

You would probably only mess them up by attempting to sharpen them.
 
cbwx34 said:
I might be off base (I know nothing about what you pictured)... but what is opposite of the piece you pictured? What's in your picture looks more like a guide... just wonder if what is opposite it does the actual cutting?
Click to expand...

These are the actual blades... there's a geared rack mechanism where an input shaft turns and the two halves of the rack move towards each other. One of these blades is mounted on each side of the rack so that they come together. The closer they move together, the smaller the square hole left between them - this is how the machine is adjusted to cut only the insulation (and not the actual wire strands). These blades are very flat and there is a very small taper on the back of the blades on the top of each side of the V-shape, so that when they come together they will slide past and against each other.
 
Jason B. said:
I would keep sending them out... probably sharpened on a grinder specifically made to cut that shape.

You would probably only mess them up by attempting to sharpen them.
Click to expand...

Yeah, it's looking like that is the way to do it. I found a few places that do blade grinding for industrial equipment - I just imagine it won't be cheap. When I saw the profile of the blade I thought "now how in the hell am I going to sharpen that right into that V-shape?!?".

I guess these industrial grinding places will have a recently dressed wheel with a nice square edge that will get in there. I talked to one place today - we'll see that the pricing comes back as :)

Thanks for the info!
 
The paddle-type file hones made by DMT (their 'Mini-Hone') and EZE-Lap (pic below) would probably be the closest to fitting that. They make them for such types of industrial/tool sharpening, for router bits, drill bits, etc. But, if you're not yet comfortable with freehand sharpening in general, these smaller, tight-fit sharpening jobs can be awkward.

81oZ45lvaFL._SL1500_.jpg


I've used the edge of a DMT credit card hone to touch up a Forstner drill bit with similar V-shaped 'serrations' at the edge. But you really need to take it slow and controlled, so as not to alter adjacent portions and to keep all bevels as dead-flat as possible. If you have access to old cutter blades of the same type, that are discarded or whatever, those might be used for some practice.


David
 
I was thinking if you mounted an abrasive strip on the edge of a work bench or table, that had the edge chamfered so that the abrasive fit all the way into the V... it would work pretty well to at least keep them touched up? (Hard to know without actually seeing one).
 
I've seen belt sanding belts get contorted into round shapes to sharpen gut hooks why not try using a v shape behind said belt and sharpen that way? Not sure how long the belts would last tho?
Or perhaps have a file made to suit the shape and sharpen that way?
 
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