Search for:. Follow on Instagram. Check availability at all stores. Add to Sweep gouge incorrect Sold Out. The higher is the sweep number the deeper is the radius. The "sweep" is a measure of curvature which is defined by the diagrams on that page in the London Pattern Book.

There must be a mathematical calculation for the " " numbers. Seems like a section in the tool section might be a good place for definitions and examples. Brian T. The "sweep" is a measure of curvature which is defined by the diagrams on that page in the London Pattern Book. Those are the definitions.

Most every carving tool maker follows the LPB, if they want to sell anything, sight unseen. The second number has come to represent the width of the gouge.

The sweep numbers climb up into the 70's when you go beyond straight to long bent, short bent, spoon bent and tracery bent shanks. None of this applies when you get into the sweeps of the Pacific Northwest native style crooked knives. The blades have progressive sweeps which may begin as 1 or 3 near the handle and tighten up to an 8 at the scorp tip.

You just pick the rate of sweep that suits the carving that you do. Most of mine are sort of J-shape overall, I like the tips near a 5 sweep for textured surface work, like a Baby Sitka adze..

Martin lionslair - It appears that there was a mathematical basis for the start of the LPB numbering. Straight edge gouges were 1.

The curved edge tools were an arc segment of a circle. So the progression from 1 to 9 was one of increased curvature. Then they tried to include skews, v-tools and other variations of edge shape and shank shape. So you could identify the gouge with a numerical code on the shank.

This discussion is more about what might be called "attack angle," how the shape of the carving tool determines how it attacks the wood. It gets even more complex when you consider how all these angles and curves affect your sharpening technique. Martin: Here's a chart I made up that may help you. The chart makes it easy to substitute one gouge for another. Example: you're looking at a book Sweep Spoon Gouges and the author says to use a.

You Hirsch Gouge Sweep Chart Plus do not have permission to view this gallery. This gallery has 1 photos. Claude, I disagree. Each sweep number is a circle of different radius. Long or short segments edges but a 3 sweep of any width is 3. It cannot ever be any other sweep of any other radius. If I texture a surface with a 5 sweep, I can't switch to any Hirsch Gouge Sweep Chart Kit 9 sweep any time I want to finish the job. It does not leave the same tool marks at all.

I hate to get into this argument but I think RV is incorrect in his example of texturing. While using a 5 for texturing, you use only a portion of the arc segment of the 5.

In fact you rarely use the full width of a gouge. So if you used a smaller arc segment of a wider 9 gouge, you might be cutting the same curve. Something I can't understand here. Every mm of all of my 5 gouges has the same sweep. That's not the same as a 9 sweep, a much smaller radius of curvature. I think it depends on the brand of gouge. My charts hold true for Flexcut and Pfiel gouges that I own. Last edited by Claude ; , PM. I'm comparing one of my Pfeil gouges with another on my bench. All my 5 are not parts of the circle for 3, 7 or 9.

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