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Old 12-02-2017, 08:24 PM   #1 (permalink)
 
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Default What is a negative scraper?

I've seen multiple folks mention that they use a skew like a "negative scraper" to make final finishing cuts. What does this mean and how is it done?
(I've tried to research this online but not getting anywhere.)

-Thanks!
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Old 12-02-2017, 08:30 PM   #2 (permalink)
 
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Hope this helps. Also Stuart Batty makes some mighty fine, and mighty expensive versions! I saw him do a demo - very impressive!

http://www.cindydrozda.com/handouts_...20scrapers.pdf
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Old 12-02-2017, 08:45 PM   #3 (permalink)
 
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This article would be a lot better if it had even one diagram.

Does anyone have a diagram they could post to clarify the words, please ?


Quote:
Originally Posted by mark james View Post
Hope this helps. Also Stuart Batty makes some mighty fine, and mighty expensive versions! I saw him do a demo - very impressive!

http://www.cindydrozda.com/handouts_...20scrapers.pdf
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Old 12-02-2017, 08:47 PM   #4 (permalink)
 
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Note that using a Skew “Like a negative rake scraper” is not the same as actually using a negative rake scraper. Most skews are ground to a totally different angle and also a Skew would not have a burr.
A scraper or a negative rake scraper will have a burr raised on the cutting edge which will do a splendid job...a burr will be worn away quickly and need to be refreshed to continue cutting.
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Old 12-02-2017, 08:59 PM   #5 (permalink)
 
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Quote:
Originally Posted by magpens View Post
This article would be a lot better if it had even one diagram.

Does anyone have a diagram they could post to clarify the words, please ?


Quote:
Originally Posted by mark james View Post
Hope this helps. Also Stuart Batty makes some mighty fine, and mighty expensive versions! I saw him do a demo - very impressive!

http://www.cindydrozda.com/handouts_...20scrapers.pdf

Some additional info: http://www.woodworkersemporium.com/c...ion-Manual.pdf

NOTE: I do not own one, I have no experience with one, just being helpful! Back to my 3/4" roughing gouge.
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Old 12-02-2017, 09:32 PM   #6 (permalink)
 
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Thanks, Mark ! . There is a lot of material to view, there ! . I'll make a start.

It is good to know about that particular tool also ... thanks !
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Old 12-02-2017, 10:19 PM   #7 (permalink)
 
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Quote:
Originally Posted by Charlie_W View Post
Note that using a Skew “Like a negative rake scraper” is not the same as actually using a negative rake scraper.

Charlie’s description is more accurate as to what we do. It still leaves a very smooth finish on most woods.
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Old 12-02-2017, 11:04 PM   #8 (permalink)
 
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Tim, would you mind describing how you do this? I'm still not following how a skew can be used like a negative scraper.
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Old 12-03-2017, 07:02 AM   #9 (permalink)
 
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Quote:
Originally Posted by magpens View Post
This article would be a lot better if it had even one diagram. Does anyone have a diagram they could post to clarify the words, please

This is my negative rake bowl scraper. It is a finishing tool, not used to hog off material. After turning a bowl form to about the correct thickness, this tool is used to remove any tool marks from the inside or outside of a bowl. Present horizontal and on center line OR just above center on inside, just below center on outside. In case of a catch, you want the material to be moving away from the cutting edge.


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It is easy to put a negative rake on a standard bowl scraper. The angle isn't critical. Any angle from 15 to 25 degrees is appropriate. The higher the angle, the less "grabby" the scraper is. Sharpen the scraper upside down to put a burr on the upper edge. Hone top surface for smoother cuts.
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Old 12-03-2017, 08:38 AM   #10 (permalink)
 
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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.
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