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Old 12-03-2017, 08:59 AM   #11 (permalink)
 
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Default What is a negative scraper?

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Originally Posted by wouldentu2? View Post
I would imagine he presents the skew with the heel and toe parallel to the mandrel and use the sharpened edge to remove any uneven ridges from the blank. Thats how I use it right before any sanding. Works great on wood don't do much acrylic.


That is correct with the handle slightly raised and the edge shaving sharp. Not a true negative rake but as Charlie called it like a negative rake. I apologize if my terminology is not correct or I have declared it to be something it is not. . For us it produces an amazingly smooth finish. We do not do hardly any acrylic.

All of our turning is “country grown, trail and error learned ( with a heavy emphasis on the latter. Almost 50 years ago my grand dad spent about thirty minutes showing me what to do at his lathe the rest has been hunt and pick until it works )

Last edited by Talltim; 12-03-2017 at 09:09 AM.
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Old 12-03-2017, 09:12 AM   #12 (permalink)
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Quote:
Originally Posted by ghansen4 View Post
Tim, would you mind describing how you do this? I'm still not following how a skew can be used like a negative scraper.
A skew is usually used with the handle down and blade upward and cutting in at an angle. When used as a "scraper", it is laying flat on the tool rest, handle presented level to the blank. Since the skew is beveled on both sides, and presenting the blade flat and level to the blank, the blade end is at a negative angle.

Notice that Randy posted a picture and how the end of the blade is ground slightly downward - the end of the skew, when presented this way, the blade edge is also slightly downward. This is a "negative" angle when presented level to the blank.

BTW, this is not what is commonly referred to as the purpose of a skew. While using the skew as scrapper is OK, it is not what wood turners refer to as the intended use of a skew. Skews were originally intended to "cut" . . . not "scrape". But when used flat as a scraper, the bevel of the end comes in contact at a negative angle, ergo "negative scraper."
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Old 12-03-2017, 10:24 AM   #13 (permalink)
 
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Default What is a negative scraper?

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Originally Posted by leehljp View Post

BTW, this is not what is commonly referred to as the purpose of a skew. While using the skew as scrapper is OK, it is not what wood turners refer to as the intended use of a skew. Skews were originally intended to "cut" . . . not "scrape".


We do occasionally use the skew the way it was intended as well.

I used to be into woodcarving. I went to South America and there were guys there sitting on logs in the mesquito infested jungle using tools made from who knows what. They put out work that I couldn’t dream of doing with my Henry Taylors.

I was impressed and thought well what ever works and gets the job done.

Now I do admire people that are blessed to do it the right way. I am just seldom one of them.

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Old 12-03-2017, 12:19 PM   #14 (permalink)
 
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The term has been in the metal lathe world for ages. These are tool bits for a metal lathe as explained in the Machinist's Blog.

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