Wood Turning by Joaz Hill. Practical Objects and works of Art Handmade in Stonington, Maine

Joaz Hill ~ Stonington, Maine ~ 207-367-5816 ~ Email Joaz

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The Shear Scraper Tool

Take a look
At the Shear Scraper


THE TOOL

.......The tool is a 1 1/2" firmers gouge. It can either be carbon or high speed steel. I use the firmers gouge but you can also use a shallow roughing gouge or large spindle gouge. You don't want to us a deep fluted gouge as the angle is too deep.   Of course, you can also make smaller scrapers with smaller spindle gouges, these are good for working on the foot or bottom. 

SHARPENING

..........Place the tool hollow side down (concave down) on the grinder rest. Swing the tool so the sides and end are sharpened. It does not really matter at what angle you grind it. However, I have found that if you make it too steep it  is very aggressive. I would say 30 to 45 degrees is good.  You can also burnish on a Veritas jig, this makes for a very aggressive burr. I have also use a diamond stone for honing, but I find it difficult to to get a satisfactory edge.

USES

..........I mostly use this tool for the inside of bowls.  Place the tool flat on the tool rest (hollow side down). Get it as close as possible to the work.  Pull from the bottom of the bowl to the top edge.  I generally hollow my pieces in sections I do the first  third of the bowl in the conventional way and then shear scrape and sand. This gives plenty of stability because you have lots of mass in the bottom. As you pull the tool along you are only trying to get a nice untorn surface. Use a light touch and try to use the side of the tool. If you use the point on the surface at this point you will end up making a slight cove. As you progress down toward the bottom you will realize that the point of the tool is excellent for finishing that pesky transitional area between the bottom and the side. Again, this is a pulling cut from bottom to top.  You may find a slight ridge between sections, this can easily be smoothed with a light touch of the tool.
 
  Outsides of bowls can also be sheared with this tool. However, I wouldn't advise trying it until you get used to what the tool can do.  Again, pull from the bottom toward the top edge using the side of the tool. If your lathe can be reversed, you can get a real nice surface by shearing one side and then the other. 
   With a large tool, it is possible to hog large amounts of wood from the inside with the point straight in. 
 I have found with practice that I can use this tool further off the rest in hard to get at places such as interior shoulders.  I have not tried this tool on boxes but would think it would be excellent for bottoms and sides. You can also push the tool to shear but this takes a little practice but can create a nice clean surface. 
  I did not invent this tool. A friend saw an article in a British woodturning article and had a vague idea of how to make it. I took it from there and perfected it on my own.  I have always had a real fear of shear scraping ,such as trying to hold a straight scraper at an angle on the tool rest.  This tool allows anyone with very little know how to experience the joy of  finishing a surface without tearout and minimum sanding.
 
 

TRY THIS TOOL AND SEND ME YOUR FEEDBACK OR QUESTIONS

ShapeShifter Home Goblets Bowls archive one Bowls archive two Bowls archive three Wood Turning Classes Shear Scraper Links Email Joaz Hill
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