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Bevel Pinion: 12 Teeth, 8 Pitch, for a 24-Tooth Gear (Brown & Sharpe 1911)
Brown & Sharpe's own worked example: the small gear of a 12 and 24 tooth bevel pair, 8 pitch, shafts at right angles, cut with the No. 8 cutter they send to anyone who orders one for this pinion. The method is the same as for mitre gears: set off centre, cut each side, file the small ends.
Source: Brown & Sharpe, Practical Treatise on Gearing (1911), Fig. 23 example, Part I ch. IX–X, Part II ch. III and the set-over table p. 58. The blank sizes are our arithmetic with their rules; the steel and bore are ours. Picture: their Fig. 23.
高级
1 day
说明
1
1
Work out and turn the blank
Work out and turn the blank
Pitch diameter 12 ÷ 8 = 1.500 in. Angle of edge 26° 34′ and angle of face 59° 11′ (Brown & Sharpe's figures for every 12 and 24 tooth pair). Diameter increment = cos 26° 34′ × 0.250 = 0.224 in, so turn the steel blank to 1.72 in outside diameter. Face ½ in long. Try both angles with a protractor against the end of the hub.
此步骤所需材料：
低碳钢条1 length for one blank所需工具：
金属车床
车床切削刀具
量角器
千分尺2
2
Choose the cutter
Choose the cutter
Twice the back cone radius × 8 comes to about 13, so a No. 8, 8-pitch bevel gear cutter. Measure its thickness Tc at the pitch line, 0.145 in from its tip.
所需工具：
锥齿轮铣刀
齿厚游标卡尺3
3
Set the head at 22° 18′
Set the head at 22° 18′
Apex distance = sec 26° 34′ × 1.5 = 1.677 in. Angle increment: tan = sin 26° 34′ ÷ 6, giving 4° 16′. Set the dividing head to the cutting angle 26° 34′ − 4° 16′ = 22° 18′ and index 12 spaces. Depth at the large end 0.270 in.
所需工具：
铣床
分度头锥齿轮铣刀4
4
Set over and cut one side
Set over and cut one side
Apex distance ÷ face = 3.35; we take the nearest column, 3¼, where a No. 8 cutter has the factor .286. Set-over = Tc ÷ 2 − .286 ÷ 8 = Tc ÷ 2 − 0.036 in. Set off centre by that amount, take up backlash, and cut round all 12 spaces.
所需工具：
铣床分度头锥齿轮铣刀5
5
Set over the other way and trim
Set over the other way and trim
Set over the same amount the other side, line the cutter up with the space at the small end, take a trial cut, and rotate toward the cutter until the tooth is 0.196 in thick at the large end and 0.138 in at the small end. Check with the gear tooth vernier, then cut round.
所需工具：
铣床分度头锥齿轮铣刀齿厚游标卡尺6
6
File the small ends
File the small ends
File the teeth rounder at the small ends, where the cutter could not, without filing them thinner at the pitch line. The cutting angle is under 30°, so the spaces may come out narrower at the face than the cutter suggests; Brown & Sharpe's own shop used a No. 6 cutter here instead.
所需工具：
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