Gear Cutting Tools

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Profiles of current tooth systems and corresponding basic hob profiles Involute teeth for spur- and helical gears, basic cutter profile e. g. DIN 3972 I-IV. When ordering please quote: Module, pressure angle, basic profile of the teeth (fig.1.00) or basic hob profile (fig. 2.02). p s P0 ö fP0 h a h f h h h P0 h aP0 α ö aP0 Workpiece Basic cutter profile h = profile height = cutting depth h P0 = profile height h a = addendum h aP0 = addendum h f = dedendum α = pressure angle p π = m = module Fig. 5.00 Involute teeth for spur- and helical gears with addendum tip relief. This profile shape is used to avoid interference when the gears roll into mesh. When ordering please quote: Module, pressure angle, number of teeth, helix angle, profile displacement and tip circle dia. of the gear, basic profile of the teeth, height and width of the tip relief or basic hob profile. <strong>Gear</strong>s of high-speed transmissions are corrected in the tooth tips to reduce noise. In this correction the elastic tooth deflection has been taken into account. The cutter correction is then matched to the number of teeth to be cut on the gear. C aP h CaP h a h f Workpiece h CaP = height of the tip relief CaP = tip relief h h p ö aP0 s P0 h CP0 ö fP0 h aP0 R CP0 Basic cutter profile h CP0 = height of the correction over the reference line R CP0 = radius of the correction h P0 Fig. 5.01 Involute teeth for spur- and helical gears with tip chamfer. When ordering please quote: Module, pressure angle, number of teeth, helix angle, profile displacement and tip circle diameter of the gear, basic profile of the teeth, radial amount and angle of the chamfer or basic hob profile. The tip chamfer can be regarded as a protective chamfer, which protects the tooth tip edge against damage and burring. For long production runs it is advisable to chamfer the gear tip edge simultaneously with the hob. The number of teeth range which can be cut with one hob is in that case limited, since the size of the chamfer would be reduced with fewer teeth/gear and greater with more teeth/gear. h a h f h K a K h h h FfP0 a KP0 p P0 ö aP0 s P0 h aP0 ö fP0 Workpiece Basic cutter profile h K = radial amount of the tip chamfer h FfP0 = effective dedendum α K = angle of the chamfer of the basic cutter profile α KP0 = profile angle of the chamfer flank h P0 Fig. 5.02 144
Involute tooth system, for spur- and helical gears with root (protuberance) clearance. This profile formation is chosen for gears which are pre-machined for shaving, grinding or skiving. When ordering please quote: Module, pressure angle, basic profile of the tooth system, machining allowance and root clerance or basic hob profile. <strong>Gear</strong>s which are cut with shaving- or grinding allowance are best made with a protuberance cutter. The tooth root clearance obtained with this increases the service life of the shaving tool and improves the quality of the shaved or ground gear. h a q h h h f ö aP0 p s P0 Pr P0 h aP0 ö fP0 h P0 Workpiece Basic cutter profile q = Machining allowance Pr P0 = amount of protuberance Fig. 5.03 Involute tooth system for spur- and helical gears with root (protuberance) clearance and tip chamfer. This profile is used for gears which are pre-machined for shaving or grinding and which are to exhibit a tip chamfer in the finished condition. a KP0 p ö fP0 s P0 Pr P0 When ordering please quote: Module, pressure angle, number of teeth, helix angle, profile displacement and tip circle diameter of the gear, basic profile of the tooth system, radial amount and angle of the chamfer or basic hob profile. h a h f h K a K q h h h FfP0 ö aP0 h aP0 h P0 Workpiece Basic cutter profile Fig. 5.04 Involute teeth for spur- and helical gears for the simultaneous topping of the outside diameter (topping cutter). This profile type can also be used for all the previous profiles under 5.00 to 5.04. When ordering please quote: 'Topping cutter' and the details according to the pofiles 5.00 to 5.04. Topping cutters are mainly used for relatively small gears, to achieve good concentricity of the tooth system in relation to the bore. In particular, topping cutters are used when the bore is only finish machined after the teeth have been cut. When the parts are clamped over the tooth tips, accurate concentricity of the bore in relation to the teeth is guaranted. h a h f h ö aP0 p s P0 h aP0 ö fP0 h P0 Workpiece Basic cutter profile h P0 = h Fig. 5.05 145
Page 1:
Gear Cutting Tools • Hobbing •
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Important information Product range
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FETTE - a brief introduction Ecolog
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Hobs for spur gears, straight- or h
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Notes to the descriptions and size
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Solid-type hobs for spur and helica
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Solid-type hobs for spur and helica
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Hobs For economical production on m
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Multiple-gash hobs 19
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In order to achieve a high tool lif
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Gear quality The gear quality is de
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Multiple-gash hobs Recommended stru
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Carbide types and coatings The carb
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High-speed cutting (HSC) The advant
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Size table for solid carbide hobs R
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These requirements are met perfectl
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Heavy duty roughing hobs (roughing
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The rough hobbing of gears form mod
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Roughing hobs with indexable carbid
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A special position among the above
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Pitch- and tooth trace deviations a
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Skiving hobs with brazed-on carbide
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Solid-type hobs for straight spur g
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Hobs for internal gears, with strai
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Solid-type hobs for internal gears
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Hobs for compressor rotors Rotors a
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Rotor hobs, for finishing for screw
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Hobs for sprockets, timing belt pul
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Hobs for sprockets for Gall’s cha
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Hobs for sprockets with involute fl
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Hobs for timing belt pulleys with i
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Hobs for spline shafts quality grad
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Hobs for p.t.o. shafts to DIN 9611
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Hobs for spline shafts with involut
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73
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Hobs for worm gears The specificati
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Tangential method This method is su
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Engagement area and bearing contact
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Hobs for special profiles Hobs for
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. Multi-start single-position fly-c
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Worm thread milling cutters for mod
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Worm milling cutters for roughing f
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Rack milling cutters/worm milling c
Page 94 and 95: High-precision rack tooth gang cutt
Page 97 and 98: Gear milling cutters for spur gears
Page 99 and 100: Involute gear cutters for spur gear
Page 101 and 102: FETTE has considerable experience i
Page 103 and 104: End mill type gear cutters (finishi
Page 105 and 106: Gear roughing cutters with indexabl
Page 107: Gear finishing cutter ■ With carb
Page 110 and 111: Profile milling cutters for coarse-
Page 112 and 113: Rotor profile cutters for screw com
Page 115 and 116: Gear milling cutters for sprockets,
Page 117 and 118: Form milling cutters for timing bel
Page 119 and 120: Cat.-No. 2730 relief turned or reli
Page 121 and 122: Gear chamfering cutters for chamfer
Page 123: 123
Page 126 and 127: Comparison: module pitch - diametra
Page 128 and 129: Tolerances for multiple start hobs
Page 130 and 131: Hob inspection records The toleranc
Page 132 and 133: The effect of cutter deviations and
Page 134 and 135: Effect of the quality grades of the
Page 136 and 137: Hob clamping Keyway Hob clamping Dr
Page 138 and 139: Basic profiles for spur gears with
Page 140 and 141: Basic hob profiles Defination of th
Page 142 and 143: Basic hob profiles to DIN 58412 Sym
Page 146 and 147: Sprocket tooth system for roller- a
Page 148 and 149: Spline shaft tooth system; basic cu
Page 150 and 151: "Carbide" is a generic term for pow
Page 152 and 153: The enormous increases in tool life
Page 154 and 155: Total a - Initial edge wear b - mec
Page 156 and 157: Cutting materials for hobs (See als
Page 158 and 159: A further a table of recommended va
Page 160 and 161: Number of starts of the hob With th
Page 162 and 163: Tool cutting edge length A distinct
Page 164 and 165: Tool cutting edge length (continued
Page 166 and 167: Shift distance The chip cross-secti
Page 168 and 169: Maintenance of hobs Introduction In
Page 170 and 171: Requirements placed upon the cuttin
Page 172 and 173: If the high or low points of the tw
Page 174 and 175: Hobs with a slightly concave cuttin
Page 176 and 177: Gash lead (item no. 11 DIN 3968) Th
Page 178 and 179: When regrinding, ensure that the co
Page 180 and 181: form circle diameter is less than t
Page 182 and 183: Wear phenomena on the hob The cutti
Page 184 and 185: Ziegler (2) demonstrated that the c
Page 186 and 187: The effect of the cutting condition
Page 188 and 189: the penetration line is important p
Page 190 and 191: left-hand start machines a gear wit
Page 192 and 193: Involute gear cutter with indexable
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DIN number index DIN Page 138 30, 4
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