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Scraper'spotential for Spindle Turning

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Scraper'spotential for Spindle Turning Contemplating a Scraper’s Potential for Spindle Turning Matthew C. Lewis reat spindle turning is possible tool maintenance, cost, and production using a scraper if you under- speed. In short, contemplating a scraper G stand the tool’s capabilities and for spindle turning should not be driven how to apply them. You are likely famil- by community acceptance or by popular Examples of iar with the adage that real turners do opinion, but rather based on consider- not use scrapers when spindle turning. ation of the job, efficiency, and the stan- scrapers/tools for This common notion is often stated as dard of finish for the final project. spindle turning an opinion, without much explanation A variety of scraper shapes can be made beyond that scrapers are not cutting tools or purchased to provide flexibility in • Skew chisel on its side for delicate removal of small amounts of wood and therefore do not leave as clean a sur- spindle turning. These include two well- • Square-nose scraper for tenons and face as a gouge or skew chisel. Deltacraft’s known tools used in an alternative scrap- square rebates handbook, Getting the Most Out of Your ing fashion: the parting tool for turning • Parting tool for parting off, beads, Lathe (1954), however, offers this adage beads and the skew chisel used on its side and other convex shapes up for contemplation with the statement, for forming beads and pommels. • Drop-nose scraper (a variant of the “The turning of spindles can be done To avoid discussing the nuances of round-nose) for planing, coves, and beads with either a scraping or cutting tech- all possibilities for scraping tools, I will • Standard round-nose scraper for planing, nique, the cutting technique by virtue of focus on the potential of the round- coves, beads, and roughing out faster wood removal and a cleaner surface nose scraper for spindle turning. • Diamond point scraper for making being almost a must for good work.” V-grooves and beads This article offers some practical Context • Bedan tool for tenons, beads, other considerations for discerning turners, I begin with a quick review of basic convex shapes and smoothing surface addressing the term almost in this cutting tool and scraper function. passage and breaking the chains of Cutting tools generally remove wood popular turning theory by recogniz- by paring wood fibers. Paring is ing the potential of a scraper for spindle achieved when the tool’s cutting edge work. Although it may be true that the forms an oblique angle with the spin- finish from the tool is not as good, a prac- ning wood (Photo 1). A cutting tool is tical second best can be achieved with able to cut cleanly because two sur- modified technique and by factoring faces of the tool are sharpened to a fine Examples of scrapers and other tools used in an alternative scraping fashion for in the considerations of learning curve, edge which, when employed correctly, spindle turning. safety, required surface finish, ease of slices each fiber completely. 22 American Woodturner February 2011 Copyright 2011, 2016, American Association of Woodturners. All rights reserved. F e a t u r e 1 the oblique angle used to apply a cutting tool produces a cleanly pared surface. Figure 1. Clearance angle for scrapers is measured by holding the tool’s cutting edge next to the spindle turning. The scraper on the other hand, when For spindle turning, in order for a held in its standard orientation (flat on scraper to be more effective using the the toolrest with the handle in a neutral bevel-rubbing technique, the angle to slightly pitched position), scrapes between the two surfaces forming the 2 the wood fibers. Scraping is done on scraper tip should generally be more acute Scraping with the tool held in its the wood’s surface by means of a burr than often recommended for faceplate standard orientation leaves a rough on the top of the scraper’s cutting edge. turning. Myron W. Curtis learned from surface on spindles. This action typically leaves a rough decades of experimentation and success- surface and occasionally torn fibers ful production turning that a shallow (Photo 2). (For an excellent discussion semicircular scraper with a bevel angle enhanced by adjusting the presentation of scrapers and burrs for bowl turning, of 57° is a good configuration for general of the chisel to the wood and by modi- see AW, vol 18, no 1, “Real Woodturners spindle turning. Still, an even more acute fying the profile of the cutting edge. DO Use Scrapers,” by Russ Fairfield.) angle (around 45°) increases the effective- The semicircular nose of the tool ness of the round-nose scraper for the makes it useful in developing curved Configuration tight areas associated with some beads, surfaces (Photo 5), concave and convex, Modern turning literature often rec- coves, and smooth curves. The cutting in addition to achieving straight lines ommends small clearance angles (or action of a round-nose scraper with this and tapers. The cutting area for the large bevel angles) for scrapers; these type of bevel is further enhanced by shear round-nose scraper is generally from angles are measured as shown in Figure cutting (Photo 4). ten o’clock to two o’clock with the 1. Using large bevel angles seems twelve o’clock position being the tran- appropriate for faceplate work (bowl Technique sition point (Photo 6), depending on turning) because the cutting action The performance and versatility of the direction of cut, orientation to the is dependent on the use of the burr scrapers for spindle turning can be wood, and the profile of the tool. on the top edge of the scraper; this requires minimal clearance between the bevel and the piece being scraped in order to apply the burr. Although the faceplate-work technique is useful on occasion during spindle turning, a more advantageous orientation that reduces tearout is to rub the bevel while applying the sharpened edge of the scraper nose to the spinning wood 3 4 (Photo 3). (Safety note: Bevel rubbing Modifying the presentation angle of the cutting action of a round-nose the round-nose scraper by rubbing the scraper is enhanced when using the tool is not recommended when scraping bevel when spindle turning produces a as a shear cutter. endgrain and/or during faceplate cleaner surface than that produced in a turning bowls, as a dangerous dig-in standard orientation. can occur.) woodturner.org 23 Copyright 2011, 2016, American Association of Woodturners. All rights reserved. as for using a gouge or skew chisel. Care should be taken not to cut on the upward side of the cutting edge (above the transition point) when perform- ing this operation, as a catch is likely to occur and the tool will slam down on the toolrest, potentially causing 5 6 damage. An even longer bevel improves A more acute bevel angle than generally The safe and effective cutting area for a the effectiveness of the round-nose recommended improves the scraper’s round-nose scraper is indicated by the scraper for cutting certain concave or ability to shear cut along curved surfaces labeled boundaries. convex surfaces in this manner. and into tight areas. The traditional tipping of the scraper, nose down, can also be used to great advantage while spindle turning where a curve with a precise radius, close to that of the scraper, is required. This technique requires finesse and a light cut (Photos 9a, 9b). A heavy cut will certainly result in 7 8 torn fibers that are further magnified by When spindle turning, gently raising the Tilting the round-nose scraper to an side grain wood that is naturally prone to tool’s handle while rubbing the bevel oblique angle when spindle turning of the round-nose scraper produces an replicates the cleanly pared surface tearout; clean-up is easily accomplished effective peeling cut. produced by a cutting tool. in this case using the shearing technique. Considerations To improve the cut when using the typically a reason some say that a scraper Although the round-nose and other round-nose scraper during spindle is not an appropriate tool for spindle scrapers are extremely effective, it would turning, begin by rubbing the tool bevel work. The finish can be improved fairly be disingenuous to say that they produce on the spinning wood, then gently raise simply, however, by changing the orien- as consistently a clean surface off the the handle just enough to cut/peel the tation of the scraper during cutting. blade as do cutting tools for spindle wood. Using an acute bevel angle, this When making cuts that are straight, turning. There are, however, several orientation more closely approximates tapered, or gently curved, canting the noteworthy considerations in favor of the action of a cutting tool (Photo 7). scraper toward an approximately 45° the scraper that may more than make This approach will effectively cut/peel angle while rubbing the bevel will shear up for the slight degradation in surface side grain, although the finish will vary the wood fibers (Photo 8). This effect finish: learning curve, safety, required depending on the wood type and the is also accomplished when rolling the surface finish, ease of tool maintenance, direction of the wood fibers. The rougher round-nose scraper during bead, cove, cost, and production speed. finish that is frequently produced is and tighter curve cutting, the same The spindle gouge and skew chisel have a rather steep learning curve that The straight portions of the round-nose includes the potential for catches, which scraper (see right) make the nose more of a can result in damage to the piece and/ shallow dome shape and emulate the paring or turner, frustration, and elevated risk edge of a skew chisel and/or gouge when to safety.
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