Curved scraper V round carbide cutter

[brainstrust]

Ello :) Interested in peoples thoughts on the finishing of bowls mainly on the inside. Which of the two provide a better finish for you and what is your general preference? I currently use a round carbide cutter but not getting the results I'm after just yet. This is most likely due to my low skill level but I'm setting myself higher standards so I want the tool that will best help me get there:U

Thanks

Chris

[Pat]

Chris, with any scraper, finish with the cutting edge at 45 to the direction of travel, Sheer scraping.

Personally, I get better results with freshly sharpened Negative Rake scraper, than the carbide tools.

Look up Reed Grey (RoboHippy) on youtube.

[aldav]

When using a carbide tipped tool for finishing, as opposed to roughing and scraping, you need a specialised cutter that you can present to the stock as a cutter as opposed to a scraper. One of the tips in the attached photos is a standard flat topped scraper, the other has a recessed face that allows the cutting edge to be presented to the stock more like a conventional HSS cutting tool that allows a much finer finish to be achieved.

[NeilS]

Chris, with any scraper, finish with the cutting edge at 45 to the direction of travel, Sheer scraping.

.

Agreed!

I find HSS takes a finer edge than carbide, and finishing sheer scraping cuts need a very sharp edge to get those very fine wispy shavings.


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[hughie]

Agreed!

I find HSS takes a finer edge than carbide, and finishing sheer scraping cuts need a very sharp edge to get those very fine wispy shavings.


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I agree, HSS makes a better edge. I use HSS for all my scrapers especially internally.
I have a couple of Carbide scrapers and I find the edge is not as good my HSS . OK these days the carbide cutters are made from some very fine grained carbide and a really good edge can be had. But I dont think the fine grained is being used on scrapers... well mine anyway.

But if you use the round or cup type cutters I find they work better on an angle similar to scrapers and use a pull cut away from the centre. Ideally rubbing the bevel on the cup cutter will give a darn good finish. But the diameter plays a big part, small diameters handle well and catch are easy to manage, although small size is prone to making ridges and rubbing the bevel is not easy. Bigger diameters wont produce the ridging but you have a much greater edge in contact with the the wood and any catch will generally unmanageable if not catastrophic. On these cutters, I regrind the edge to a different angle to make rubbing the bevel much easier, again it is better on the shear angle and take it easy. This sort turning is best achieved with light cuts, as heavy cuts tend to produce catches that are the stuff of legends :U

[brainstrust]

Just got a couple of Benjamin's Best curved scrapers. If I'm measuring right they seem to have about a 75 degrees bevel. Whats recommended? :rolleyes:

[NeilS]

Just got a couple of Benjamin's Best curved scrapers. If I'm measuring right they seem to have about a 75 degrees bevel. Whats recommended? :rolleyes:As you don't normally rub the bevel on a scraper you can use almost any 'included' angle that you like. Some like a bit of a top bevel, some like a very obtuse included angle to keep the scraper solid. I run mine as low as 20deg, but you might like to creep up on anything as acute as that. Try your skew as a scraper on the outside of a form (not inside) as a test to see how you like a more acute angle.

I often use the swept back wings on my bowl gouges as an internal scraper for coming up the insides. The bottoms benefit from a dedicated scraper.


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[brainstrust]

20 argh!!!!! ok i think i'll play and slowly change until I like.

What I find interesting but frustrating too, is the so many different opinions on what tool and angle to use. I admit I'm really learning via youtube :B
One person swears by something and the next by something else!
It all seems to come down to what works best for you with some guidance from others. It's like being pushed in the right direction :)