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203:, United States, conducted tests which involved changing the dimensions, shapes of teeth, styles of set, and variable heat treatments of blades. Clemson claimed enormous improvements to the cutting ability of blades and built a major industrial operation manufacturing hacksaw blades sold under the trade name Star Hack Saw. In 1898, Clemson was granted US Patent 601947, which details various improvements in the hacksaw.
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On hacksaws, as with most frame saws, the blade can be mounted with the teeth facing toward or away from the handle, resulting in cutting action on either the push or pull stroke. In normal use, cutting vertically downwards with work held in a bench vise, hacksaw blades are set to be facing forwards.
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of the blade. Early blades were of carbon steel, now termed 'low alloy' blades, and were relatively soft and flexible. They avoided breakage, but also wore out rapidly. Except where cost is a particular concern, this type is now obsolete. 'Low alloy' blades are still the only type available for the
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The pitch of the teeth can be from fourteen to thirty-two teeth per inch (TPI) for a hand blade, with as few as three TPI for a large power hacksaw blade. The blade chosen is based on the thickness of the material being cut, with a minimum of three teeth in the material. As hacksaw teeth are so
364:, the blade has pins that are held by notches in the frame. Although potentially a useful tool for a toolbox or in confined spaces, the quality of blades in the Junior size is restricted and they are only made in the simple low alloy steels, not HSS. This restricts their usefulness.
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for their teeth, giving greatly improved cutting and tooth life. These blades were first available in the 'All-hard' form which cut accurately but were extremely brittle. This limited their practical use to benchwork on a workpiece that was firmly clamped in a
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The most common blade is the 12 inch or 300 mm length. Hacksaw blades have a hole at each end for mounting them in the saw frame and the 12 inch / 300 mm dimension refers to the center to center distance between these mounting holes.
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Standard hacksaw blade lengths are 10 to 12 in (250 to 300 mm). Blades can be as small as 6 in (150 mm). Powered hacksaws may use large blades in a range of sizes, or small machines may use the same hand blades.
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The kerf produced by the blades is somewhat wider than the blade thickness due to the set of the teeth. It commonly varies between 0.030 and 0.063 inches / 0.75 and 1.6 mm depending on the pitch and set of the teeth.
391:, which accept blades with hacksaw teeth. Stationary models usually have a mechanism to lift up the saw blade on the return stroke and some have a coolant pump to prevent the saw blade from overheating.
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While saws for cutting metal had been in use for many years, significant improvements in longevity and efficiency were made in the 1880s by Max Flower-Nash. George N. Clemson, a founder of
256:. A softer form of high speed steel blade was also available, which wore well and resisted breakage, but was less stiff and so less accurate for precise sawing. Since the 1980s,
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have mostly displaced them. While stationary electric hacksaws are not very common, they are still produced. Power hacksaws of the type powered by stationary engines and
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or clearance when sawing, but the set of a hacksaw changes gradually from tooth to tooth in a smooth curve, rather than alternate teeth set left and right.
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383:. Most power hacksaws are stationary machines but some portable models do exist; the latter (with frames) have been displaced to some extent by
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blades have been used to give the advantages of both forms, without risk of breakage. A strip of high speed steel along the tooth edge is
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to a softer spine. As the price of these has dropped to be comparable with the older blades, their use is now almost universal.
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without the length of cut being restricted by the frame. The frame follows the blade down the kerf into the panel.
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has a frame made of a deep, thin sheet aligned behind the blade's kerf, so that the saw could cut into panels of
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Machinery's
Handbook, 14th Edition, by Erik Oberg & F. D. Jones, The Industrial Press, 1952, pages 1390-1391
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Small hacksaw (also known as junior hacksaw). The teeth of the hacksaw blade point forward, away from the handle
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Power hacksaws are not as commonly used in the metalworking industries as they once were.
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in a "wave" set. As for other saws they are set from side to side to provide a
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Junior hacksaw, which limits the usefulness of this otherwise popular saw.
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A woman using a hacksaw for vocational training during the Second World War
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Hacksaws were originally and principally made for cutting
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375:) is a type of hacksaw that is powered either by its own
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449:. The Historical Society of Middletown. Archived from
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This article is about the tool. For other uses, see
56:. Unsourced material may be challenged and removed.
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247:For several decades now, hacksaw blades have used
360:are a small version with a half-size blade. Like
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132:Typical full-size hacksaw frame, with 12" blade
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159:with a C-shaped walking frame that holds a
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116:Learn how and when to remove this message
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239:, so care needs to be taken to prevent
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54:adding citations to reliable sources
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235:Hacksaw blades are normally quite
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475:. Google Patents. April 5, 1898
41:needs additional citations for
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445:Woodley, G. MacLaren (1955).
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21:Hacksaw (disambiguation)
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1415:Measuring and alignment
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963:Engineer's spirit level
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1311:Oxy-fuel cutting torch
678:Oxy-fuel cutting torch
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930:Measuring instruments
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289:Battle of Bunker Hill
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1380:Cutting and abrasive
473:"US Patent: 601,947"
262:electron beam welded
50:improve this article
447:"The Clemson Story"
342:An electric hacksaw
1053:Thread pitch gauge
1018:Optical comparator
772:Combination square
569:Metalworking tools
385:reciprocating saws
379:or connected to a
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155:Most hacksaws are
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381:stationary engine
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1236:Ball-peen hammer
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802:Needlegun scaler
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106:December 2009
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67: –
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61:Find sources:
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51:
45:
44:
39:This article
37:
33:
28:
27:
22:
1351:Turret lathe
1291:Machine tool
1270:
1214:metalworking
1101:Steam hammer
1048:Tape measure
1038:Straightedge
1023:Radius gauge
998:Marking blue
988:Height gauge
968:Feeler gauge
948:Center gauge
915:Rotary table
895:Lathe center
807:Piercing saw
792:Hand scraper
781:
663:Hand scraper
531:Metalworking
489:
477:. Retrieved
467:
455:. Retrieved
451:the original
440:
426:Piercing saw
393:
387:such as the
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368:
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308:plastic pipe
304:electricians
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287:used at the
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48:Please help
43:verification
40:
1430:Woodworking
1336:Tap and die
1296:Metal lathe
1261:Gear shaper
1246:Drill press
1226:Arbor press
1133:Fabrication
1111:Trip hammer
1106:Swage block
1091:Hardy tools
1008:Marking out
978:Gauge block
865:Angle plate
827:Tap and die
744:Screw press
739:Punch press
693:Tipped tool
648:Countersink
643:Counterbore
404:line shafts
362:coping saws
352:sheet metal
169:pistol grip
1457:Hand tools
1446:Categories
1153:Metallurgy
1013:Micrometer
938:Bore gauge
759:Hand tools
432:References
416:Coping saw
306:often cut
197:Middletown
76:newspapers
1281:Jig borer
1148:Machining
1143:Jewellery
842:Workbench
777:Drift pin
600:Miter saw
400:cold saws
157:hand saws
65:"Hacksaw"
16:Metal saw
1385:Forestry
1375:Cleaning
1346:Tool bit
1251:End mill
1158:Smithing
1096:Pritchel
1033:Sine bar
698:Tool bit
653:End mill
590:Cold saw
410:See also
396:Bandsaws
326:Variants
320:bonesaws
316:surgeons
300:plumbers
258:bi-metal
201:New York
1410:Masonry
1400:Kitchen
1271:Hacksaw
1210:Machine
1168:Welding
1138:Forming
1128:Casting
943:Caliper
920:Wiggler
910:Mandrel
880:Fixture
822:Scriber
782:Hacksaw
673:Nibbler
585:Bandsaw
421:Fretsaw
389:Sawzall
237:brittle
179:History
165:tension
150:bow saw
138:hacksaw
90:scholar
1420:Mining
1390:Garden
1356:Welder
1331:Shaper
1316:Planer
1241:Broach
1086:Fuller
875:Collet
847:Wrench
812:Pliers
787:Hammer
688:Shears
683:Reamer
638:Chisel
628:Broach
605:Plasma
479:18 May
457:18 May
207:Design
163:under
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85:
78:
71:
63:
1425:Power
1286:Lathe
1216:tools
1081:Forge
1076:Anvil
1028:Ruler
973:Gauge
870:Chuck
832:Tongs
817:Punch
767:Clamp
714:Brake
595:Laser
296:metal
161:blade
146:metal
97:JSTOR
83:books
1462:Saws
1395:Hand
1306:Mill
1212:and
837:Vise
658:File
633:Burr
481:2014
459:2014
398:and
371:(or
310:and
302:and
276:Uses
254:vice
230:kerf
69:news
1276:Hob
890:Jig
719:Die
226:set
195:of
152:.
142:saw
52:by
1448::
367:A
346:A
322:.
199:,
136:A
1202:e
1195:t
1188:v
561:e
554:t
547:v
523:e
516:t
509:v
483:.
461:.
119:)
113:(
108:)
104:(
94:·
87:·
80:·
73:·
46:.
23:.
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