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Post by Rob on May 5, 2014 17:58:27 GMT
Can this be done with the PE? Pretty sure if it can I don't have the necessary jig. Even if not carbide, can HSS steel be done? I've got a tear drop cutter for deep hollowing and have been sharpening with strokes on a small diamond file but I don't like it, don't feel it really sharpens it much and would prefer a more methodical, repeatable jigged up approach.
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Post by Graham on May 5, 2014 18:04:55 GMT
I cannot imagine how you would hold then if off the tool but I have seen somewhere that Sorby do a diamond belt for sharpening carbide.
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paulm
New Member
Posts: 18
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Post by paulm on May 5, 2014 18:12:59 GMT
With the hss cutters Rob I run the flat surface (not the vertical or angled cutting edge) on a fine diamond stone a few times and it refreshes the sharpness very well.
It would probably work with carbide cutters too I imagine though may need a few more swipes ?
Cheers, Paul
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Post by Rob on May 5, 2014 19:12:50 GMT
what you mean the top surface Paul? ie the plane that is facing the ceiling as its installed in the handle (and head)?
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Post by Rob on May 5, 2014 19:13:42 GMT
also have you used any of those Trizact belts Paul?
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Post by Graham on May 5, 2014 19:23:39 GMT
I have the 600 grit Trizect Rob. but not used it enough yet to form much of an opinion.
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Post by Jeff Farris on May 5, 2014 19:39:45 GMT
In the image above you can see the 472 tip holder, which accommodates a wide variety of cutters, including half-moon hollowing tips as shown toward in the model's palm. We also have a similar tool holder specifically for the TurnMaster cutters, since they use a much smaller mounting hole. None of the regular belts will cut carbide...not even the TriZacts...but we do offer a diamond belt that will get the job done. It's spendy, but it will last you a lifetime. I imagine your teardrop is HSS...if it is Robert Sorby, I can promise you it is and I don't know of any of our competitors doing that profile in carbide.
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Post by Rob on May 5, 2014 20:18:58 GMT
Thanks Jeff. It's most likely HSS as I'm sure I would have remembered otherwise. I actually prefer HSS partly because I can handle the sharpening and partly because you get a finer finish with HSS as the "grain" is finer than carbide if my understanding is correct.
Thanks for the tip (sorry about the pun). I'll check it out.
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Post by Rob on May 5, 2014 22:15:05 GMT
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Post by Rob on May 5, 2014 22:20:46 GMT
Jeff....what angle do you grind the tips at 80 or 90 deg?
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Post by Jeff Farris on May 6, 2014 4:23:50 GMT
The hollowing tips (the little ones) I grind at 80 degrees, along with pretty much all scrapers. The exception is the Robert Sorby Multi-Tip Hollowing Tool (pictured below). The teardrop scraper on the Multi-Tip is designed to be ground dead square...then it can be used from either side.
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paulm
New Member
Posts: 18
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Post by paulm on May 6, 2014 5:47:40 GMT
what you mean the top surface Paul? ie the plane that is facing the ceiling as its installed in the handle (and head)? Yep, spot on Rob, much easier than trying to sharpen on the edge with or without a special jig, and works a treat with hss. Haven't tried the trizac belts as they are quite expensive and I don't really know what I would use them for ! I have some 240 and 320 grit zirc belts that I use occasionally, but generally find 180 grit is as fine as I need for most turning tools, and chisels/plane blades I hone on 3m papers or ceramic stones for a final edge. Maybe the trizac would be good for knife blades ? Cheers, Paul
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Post by Rob on May 6, 2014 12:22:21 GMT
Right then. Well, I just wouldn't have thought that. Somehow seems counter intuitive but I guess as long as you take metal from one of the planes of the edge, you're removing the rounded over steel and restoring the edge. The fact its not the "normal" plane doesn't really matter I guess?
I'm also finding the 60 grit ceramic is my go to if there's anything about the shape I want to change and then maintain with the 180. The 320 is way too fine for my taste. I'm finding it just polishes the edge and doesn't have a huge impact.
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Post by Graham on May 6, 2014 12:30:21 GMT
The 320 is way too fine for my taste. I'm finding it just polishes the edge and doesn't have a huge impact. So just imagine what the 600 Trizect is like..... or the 1200 or 3000 ( Last two from memory )
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Post by Jeff Farris on May 6, 2014 12:34:46 GMT
Paul,
You're right, of course...lapping the top face of a scraper can renew the edge nicely. That process doesn't work in a couple situations, though. If you use the tool too long without sharpening, lapping to an edge can take longer than working from the bevel since there's a larger contact area with the abrasive. Also, if you chip the edge with something hard in your turning, it's easier to fix by grinding the bevel.
The 1200 and 3000 grit TriZact belts are for knives and carving tools. But, the 600 grit brickweave TriZact is a great belt for turners when used appropriately. I use it on scrapers with a very light touch before making the last cut on a turning. I use it on my skew chisels and on my detail gouge. Just remember, it isn't as aggressive as it feels to your fingers. Don't try to remove significant amounts of material with it.
The TriZact belts are a bit expensive, but they last an incredibly long time. I've been using the same 600 grit belt in my demo kit for over a year.
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