?helical

helical發(fā)音

英：[?hel?kl]　　美：[?h?l?k?l, ?h?l?-]

英：　　美：

helical中文意思翻譯

adj.螺旋狀的

helical詞形變化

副詞: helically |

helical常見(jiàn)例句

1 、Like spur gears helical gears connect parallel shafts, however the teeth are not parallel to the shaft axes but lie along helices about the axes.───和直齒輪一樣。斜齒輪也安裝在兩根平行軸上，但是，斜齒輪上的齒與軸線(xiàn)不是平行的，而是成一斜角。

2 、It is the helical clearance area in API connections after making up that contributes to leaking.───API螺紋嚙合后存在的螺旋性間隙是導致螺紋接頭泄漏的根本原因。

3 、The characteristics and helical angle of the double circular arc gear are very different from those of the involute gear.───雙圓弧齒輪傳動(dòng)的嚙合特性和螺旋角的設計與漸開(kāi)線(xiàn)齒輪傳動(dòng)有質(zhì)的區別。

4 、In a globular protein, certain portions of the chain are coiled into helical segments.───在球狀蛋白中，鏈的某些部分被盤(pán)成螺旋狀。

5 、Input a revolution to the handle to drive the helical gear set to rotate another rotation system.───手把輸入旋轉運動(dòng)于轉輪，轉動(dòng)小齒輪和大齒輪。由小齒輪轉動(dòng)另一組的轉動(dòng)系統。

6 、In a plumulaceous feather, barb ridges grow straight without any helical movement.───在絨羽上，羽枝脊則直直生長(cháng)，不做螺旋形移動(dòng)。

7 、The scraper blades feature left hand helical grooves and are hardfaced for maximum service.───刮管刀表面上有左螺旋線(xiàn)，刃口為高硬度材料，因此經(jīng)久耐用。

8 、Any of various irregularly coiled helical spirochetes of the genus Borrelia, some species of which cause relapsing fever in humans, other mammals, and birds.───包柔氏螺旋體屬一種包柔氏螺旋體屬螺旋不規則的螺旋體，其中一些會(huì )引起人類(lèi)、其他哺乳動(dòng)物和鳥(niǎo)類(lèi)的回歸熱病

9 、A couple walking in the park noticed a young man and woman sitting Helical Structure Resulting in Optical Activity on a bench, passionately kissing.───一對夫婦在公園里散步，發(fā)現一對年輕的男女坐在一條長(cháng)凳上，動(dòng)情螺旋結構導致旋光性地接吻。

10 、Based on the grinding principle of non-coaxial helical micro-drill poi nt, the mathematical model of grinding parameters is established.───基于非共軸螺旋面鉆尖的刃磨原理,建立了刃磨參數的數學(xué)模型。

11 、A printer that forms dot matrix characters by means of linear, ridged print hammers that impact paper and ribbon against a helical ridge on a rotating cylinder.───一種采用線(xiàn)性脊紋打印錘的點(diǎn)陣字符打印機，打印時(shí)打印錘撞擊緊貼在螺旋脊紋旋轉圓筒上的紙和色帶。

12 、These applications, as in most machine elements, have developed into many standard forms, such as spur, bevel, helical, and worm gears.───大多數機器元件的這些應用已經(jīng)發(fā)展成許多標準形式,例如柱齒、傳動(dòng)齒輪、螺旋齒輪及渦輪齒輪。

13 、The paper reports a new kind of feeding method using intermeshing helical roll for cold feeding rubber extruders.───提供了一種冷喂料橡膠擠出機新型螺旋嚙合輥喂料方法。

14 、Note the lobes, the thickness of the helices, the depth of the conchae.─── 看看這耳垂 耳輪的厚度 和外耳的深度

15 、Any linkage which contains a screw pair, for example, is a spatial mechanism, since the relative motion within a screw pair is helical.───凡帶有如螺旋副之類(lèi)的連桿都是一個(gè)空間機構,因為螺旋副的相對運動(dòng)是螺旋運動(dòng)。

16 、There are different impinging tone frequencies corresponding to helical and symmetric flow pattern.───并且螺旋模態(tài)與對稱(chēng)模態(tài)對應不同頻率的沖擊單音,在同一工況下可能存在兩種流動(dòng)模態(tài)共存的情況,此時(shí)沖擊單音也具有多頻率特性。

17 、Dynamic mathematical model of helical coils of steam generator of HTR-10[J].Chinese High Technology Letters,2001,(1):96-99 (in Chinese).───HTR-10螺旋管式直流蒸汽發(fā)生器的動(dòng)態(tài)數學(xué)模型[J].高技術(shù)通訊,2001,(1):96-99.

18 、The conventional linear and circular interpolation in Cartesian (rectangular) coordinates were supplemented by polar coordinates and helical interpolation.───傳統的笛卡爾的線(xiàn)形和環(huán)形內**法結合被極坐標和螺旋**補所補充。

19 、The CD spectra showed that the addition of glycerol to the collagen did not damage the native triple helical structure of collagen.───圓二色譜表明，甘油的加入沒(méi)有改變膠原天然的三股螺旋結構。

20 、The azimuthal phase term of the LG modes results in helical wave fronts.The phase variation along a closed path around the beam center is .───LG模的角向術(shù)語(yǔ)來(lái)源于螺旋波前，相變量沿著(zhù)一條封閉路徑繞光束中心一周就.

21 、This artical presents the principle and equipment for slotting large modulus gear with helical teeth and herringbone gear with narrow slot cutter groove.───介紹了在大型普通滾齒機上**削大模數斜齒輪和小空刀槽人字齒輪的原理與裝置。

22 、The paper introduces the method and application of non-differential hobbing helical cylindrical gear.───介紹了無(wú)差動(dòng)滾切斜齒圓柱齒輪的方法及應用。

23 、Because the ureteral musculature ru in an irregular helical pattern， stretching of its muscular elements leads to lengthening as well as widening.───因為輸尿管是不規則螺旋形走向，肌內成份的牽張使輸尿管延長(cháng)及增寬。

24 、Arc Sprayed Helical Electrodes Resonant Silent Discharge CO2Laser[J].───引用該論文 傅以勇,閻偉中,劉海北,酈唯誠.

25 、The existence conditions of helical equilibrium are discussed as a special configuration of the rod.───作為特殊的平衡狀態(tài)，討論桿的螺旋線(xiàn)平衡的存在條件。

26 、If the period of helical corrugation is too small, the linearity of operating mode becomes very poor.───如果波紋周期太小，則工作模式線(xiàn)性變得很差。

27 、Abstract： The vane-loaded helical slow-wave structures is widely used in high power, broadband traveling-wave tubes (TWT's).───摘 要： 翼片加載螺旋線(xiàn)慢波結構廣泛應用于大功率、寬頻帶行波管中。

28 、LF200 consists of a 3-shaft helical gear set and a lockable planetary differential gear. its output shaft and input shaft swivel in the same direction.───LF200型分動(dòng)器由三軸式斜齒輪組和帶有可鎖式軸間行星式差速器組成，其輸出軸和輸入軸旋向相同。

29 、Two same scan protocols were prepared: unenhanced helical and enhanced CTA.───即制定兩組掃描參數相同的計劃螺旋采集平掃與增強掃描。

30 、The four main types of gears (spur, helical, worm, and bevel)and a rack and pinion are shown in Figure 7.───圖7所示是四種主要的齒輪（巨齒輪，斜齒輪，蝸輪和傘齒輪）以及齒條和小齒輪。

31 、Some helical slow-wave structures of TWT are calculated by the derived equations, and the calculated results accord with measured values very well.───利用導出的方程對實(shí)際行波管的螺旋慢波結構進(jìn)行計算，計算結果與測量結果具有良好的一致性。

32 、The principal rotation the sword pass through the helical gears without requiring lognitudinal gearshafts.───賓不靜彈不靜刀堵住歪齒輪解傳達，而不必要縱向傳不靜軸。

33 、Objective To improve the accuracy rate of intussusception in adult with multi-slice helical CT (MSCT).───摘要目的探討如何提高多排螺旋CT診斷成人腸套疊的準確率。

34 、Analysis on dispersion characteristics of helical groove gyro TWT[J].───引用該論文 楊家棟,宮玉彬,魏彥玉,黃民智,王文祥.

35 、GALVANISED METAL CONDUITS, STAINLESS STEEL, POLYISOCYANURATE FOAM: HELICAL CONDUITS WITH CIRCULAR...───分類(lèi)標題：承重的黑色金屬管道|白鐵板條...

36 、The relationship between helical structure of chira l molecules and their optical activities has been concerned permanently by organ ic chemists.───手性分子的螺旋結構與其光學(xué)活性的關(guān)系，是有機化學(xué)家長(cháng)期關(guān)注的問(wèn)題。

37 、The coil,or helical,spring consists of a wire or rod wound into a helix and is primarily intended for axial direct compression or tension loads.───卷簧，或者說(shuō)螺旋形彈簧包括一條盤(pán)成螺旋形的金屬絲盤(pán)條，它起初是用于軸向直接壓力和拉伸。

38 、Two types of viral symmetry have been recognized, the cubical symmetry and helical symmetry .───已經(jīng)證實(shí)病毒有兩種對稱(chēng)型，即立體對稱(chēng)和螺旋對稱(chēng)。

39 、Helical CT is therefore contraindicated in children and pregnant women.───因此多面螺旋電腦掃描禁用于兒童及孕婦身上。

40 、Numerical calculation of two-dimensional magnetohydrodynamics code for helical magnetic flux compression generator[J].───引用該論文 趙強,董志偉,袁光偉,王貴榮,楊顯俊.

41 、The technology of pulling forming method of helical vane is introduced. Accurate vane materiol drawing is made by middle layer method.───介紹螺旋葉片拉伸成形工藝方法。以及如何采用中間層計算法準確計算螺旋葉片下料圖尺寸。

42 、The basic features of the curved surface helical baffle heat exchanger with special form of baffles was introduced.───介紹了一種具有特殊折流形式的螺旋折流板換熱器。

43 、Double helical structure of DNA and types of DNA helices.───去氧核糖核酸的雙螺旋結構與其類(lèi)別。

44 、We also demonstrated that a DX molecule containing another small double helical region (called a DX + J molecule) is very stiff.───我們也證實(shí)，DX分子外加其他雙股螺旋小片段所形成的DX+J分子也一樣堅固。

45 、Rotary Air compressors use two meshed rotating positive-displacement helical screws to force the gas into a smaller space.───充分發(fā)揮經(jīng)濟師在經(jīng)濟建設中應有的作用，提高行業(yè)道德水平，促進(jìn)我省工程造價(jià)咨詢(xún)業(yè)持續、健康、有序的發(fā)展。

46 、TI worm drive is a novel kind of hourglass worm, which consists of involute helical gear and enveloping hourglass worm.───TI蝸桿由漸開(kāi)線(xiàn)斜齒輪包絡(luò )形成,與斜齒輪組成一種環(huán)面蝸桿傳動(dòng)。

47 、Sensitivity, specificity, positive predictive value, and negative predictive value of multi-detector helical CT with oral contrast were 97.6%, 75%, 93.0%, and 90.0%, respectively.───口服腸道準備小腸CT檢查的敏感度為97.6%(40/41),特異度為75%(9/12),**預測值為93.0%(40/43),陰性預測值為90.0%(9/10)。

48 、Furthermore, the pressure drop in helical baffles heat exchangers gets down with the increase of helical angle.───同時(shí),隨著(zhù)螺旋角的增大,螺旋折流板換熱器的殼程壓力損失呈下降趨勢。

49 、In sum, in the case of laminar flow, the outside helical flow would have a little influence on MF of purity water.───總之，在層流條件下，對于純凈水的微濾，外旋流的方式對微濾通量的影響并不顯著(zhù)。

50 、Cadet, scan to determine if the helical trauma to the body is related to the spiral markings on the ship's hull.─── 學(xué)員 掃描確認 船體上螺旋狀的損傷是否跟 船殼上螺旋狀的印記有關(guān)系

51 、VCRs use a helical format, known as VHS (Video Home System), consisting of two helical bands and tape 1/2 in. (1 cm) wide.───卡式錄影機（VCR）VHS系統是用螺旋模式，有兩個(gè)螺旋帶組成，用的是1/2寬的磁帶。

52 、W is attached to a bar, movable vertically around an axis A and suspended by the helical spring F.───擺錘W裝在一根桿上，在軸A周?chē)怪币苿?dòng)，它由螺旋彈簧F所懸掛。

53 、Three-dimensional numerical simulation method is used in the design of a diesel engine s helical intake port for the practical product.───以實(shí)際產(chǎn)品為研究對象,將三維數值模擬方法應用于柴油機螺旋進(jìn)氣道的改進(jìn)設計中。

54 、The rapidly quenched copper alloys containning high density vacancies produced helical dislocations during aging.───具有高濃度空位的急冷合金在時(shí)效過(guò)程中產(chǎn)生了蜷線(xiàn)位錯。

55 、"Possible tests include entilation-perfusion (/Q) scan, multidetector helical computed axial tomography (CT), and pulmonary angiography," they wrote.───他們寫(xiě)道，“可能性試驗包括肺通氣/灌注顯像（/Q）掃描，多層螺旋狀計算機X線(xiàn)體層攝影（CT），及肺血管造影術(shù)”。

56 、Design rules and modeling method of helical intake ports are explored.───探討了螺旋進(jìn)氣道的設計規律及造型的具體方法。

57 、Altogether, roughly 67% of HSA is helical, with a remainder in turns and extended polypeptide and a large number of disulphide bridges.───它總共約有67%的螺旋結構，還含有少量的轉角結構和松散的多肽鏈。

58 、Roll wafer with helical line.───擁有美麗的螺旋狀條紋。

59 、A unified model was established for spur cylindrical gears, helical cylindrical gears, spur bevel gears and helical bevel gears.───建立了直齒圓柱齒輪、斜齒圓柱齒輪、直齒圓錐齒輪、斜齒同錐齒輪的統一模型。

60 、The solving method for main cutting edge and grinding principle for flank of non-coaxial helical micro-drill point is described.───介紹了主切削刃的求解方法以及非共軸螺旋面鉆尖后刀面的刃磨原理；

61 、Our catch of the day? A helium-filled helical balloon and hand-launched parachuters for TF, and a cute little pink round donut cushion for TW.───我們又買(mǎi)了什么呢？一個(gè)螺旋形的氫氣氣球，和手握式降落傘玩具給廷豐，廷慧卻挑了個(gè)可愛(ài)的小救生圈。

62 、GS serial helical worm geared motor has large ratio and low noise when it runs.───GS系列渦輪蝸桿-斜齒輪減速電機具有大的減速比，運行時(shí)噪音底。

63 、"Multiphasic helical CT is the modality of choice in this cohort.───作者表示，多面螺旋電腦掃描是物理療法的另一種選擇。

64 、In the core, Coriolis forces deflect the upwelling fluid along corkscrewlike, or helical, paths, as though it were following the spiraling wire of a loose spring.───在地核中，科氏力使涌升的流體沿著(zhù)像開(kāi)酒瓶器的螺旋路線(xiàn)上升，彷佛順著(zhù)彈簧的螺旋線(xiàn)圈移動(dòng)。

65 、A maxi- mum peak power of 660mW at 260.0nm was obtained with a helical hol- low cathode of 1.2m length, 6mm inner diameter and 9mm coil pitch.───在放電長(cháng)度1.2m,內徑6mm,螺距9mm的分段放電管中,在波長(cháng)260nm時(shí)獲得最大峰值功率660mW。

66 、The structure and working principle of ALDEC506 horizontal helical centrifuge and its application in sludge dewatering are introduced.───介紹了ALDEC506型臥式螺旋離心機結構、工作原理及在污泥脫水中的運行情況。

67 、Objective TO evaluate the value of helical CT and pulmonary artery angiography in the diagnosis and treatment of pulmonary embolism.───摘要目的評價(jià)螺旋CT和肺動(dòng)脈造影在肺動(dòng)脈栓塞診斷和治療中的作用。

68 、AGMA standard, built-in precision helical gearing consisting of a bull-gear and three individual pinion gears sized.───AGMA標準制造，精密制造的斜齒輪系由一個(gè)大齒輪和三個(gè)各自獨立的小齒輪組成。

69 、The rotation direction also will be determined by helical direction, while the configuration also can be predicted if the rotatory direction is known.───從螺旋方向可以推斷旋光方向,知道旋光方向也可以推斷構型。

70 、A heat exchanger pipe with continuous helical baffles was proposed.Pressure distribution and head loss of the heat exchanger pipe were calculated.───摘要提出了一種連續螺旋折流板換熱管，對其內部流場(chǎng)進(jìn)行了數值模擬，并進(jìn)行了物理模型實(shí)驗驗證。

71 、Virions may be polyhedral or helical and vary greatly in size.───其形狀有多面體形和螺旋形，其體積大小多變。

72 、Various helical rich protein structure models will be used to reveal the properties of protein helices.───不同螺旋的富含蛋白質(zhì)結構的模型將會(huì )用來(lái)展現蛋白質(zhì)螺旋的特性。

73 、The helical vane is analyzed.The helical vanes are welded together and added the external force to be cold-drawing formation.───對螺旋葉片進(jìn)行了分析，把螺旋葉片焊接組合起來(lái)，旋加外力，冷拉成型。

74 、Cui Haiqing,Liu Xisheng.Velocity distribution of helical flow of non Newtonian fluid in eccentric annuli[J].Acta Petrolei Sinica,1996,17(2):76-83.───[6]崔海清,劉希圣.非牛頓流體偏心環(huán)形空間螺旋流的速度分布[J].石油學(xué)報,1996,17(2):76-83.

75 、The parameterized solid model of helical gear and dynamic simulation of mesh force in gear meshing process is taken as an example of this method.───如果用普通程序去開(kāi)發(fā)一臺適合于新型工件的纏繞機,不僅研究經(jīng)費巨大而且不一定取得預定的效果。

76 、A complete methematicdl model of the exmponential curve type shearer drum hub and vane and a CAD method for expansing helical vare are descrided .───以指數曲線(xiàn)滾筒為代表，建立了異形滾簡(jiǎn)及其螺旋葉片的完整數學(xué)模型。

77 、The polynucleotide chain is helical.───多核苷酸鍵是螺旋形的。

78 、Bimetal thermometes use a helical coil with fit stem.This requires clearance for a movement of the pointer to indicate the temperature.───把雙金屬感溫元件做成直螺旋圈狀，一端焊接在固定點(diǎn)，自由端則隨溫度變化旋轉，帶動(dòng)連桿指針指示溫度。

79 、In order to research into the flow characteristic of power law fluid's helical flow in concentric annulus,an experimental model was established.───為研究?jì)缏闪黧w同心環(huán)空螺旋流的流動(dòng)特性,建立了流體的同心環(huán)空螺旋流動(dòng)實(shí)驗模型。

80 、Well, this device runs using gold helical springs.─── 這個(gè)裝置靠金制螺旋彈簧運轉

81 、The high laevorotation of L-cystine depends on a specially helical structure of its molecular.───指出了L-胱氨酸高度的左旋性是由其分子的特殊螺旋結構決定的。

82 、A simplified linear analysis for magnetic helical instabilities of arc discharges in a cylindrical plasma is developed.───摘要在靜電近似下，給出了圓柱等離子體中電弧放電螺旋不穩定性的一個(gè)簡(jiǎn)化線(xiàn)性分析，得到了顯式解析解。

83 、It can pro vide a better voltage flat by increasement of numbers of helical coil sections a nd branch in parallel.───增加螺線(xiàn)管段數和導線(xiàn)并聯(lián)分支數，可得到一個(gè)比較好的電壓平臺。

求英文高手幫我翻譯一個(gè)文章（漢譯英，機械類(lèi)）

機械部件

查理比爾茲利

齒輪

帶動(dòng)和螺旋齒輪。一個(gè)齒輪齒后，常常被認為是直與平行

其主軸是眾所周知的是一個(gè)齒輪等。一種激勵，一雙可以用來(lái)連接平行槽只。

平行槽，不過(guò)，也可以連接齒輪的另一種類(lèi)型，和一個(gè)正齒輪

可以交配與齒輪的一種不同類(lèi)型。

為防止干擾，由于熱膨脹，以幫助潤滑，并

彌補不可避免的失實(shí)之制造，一切權力傳遞齒輪

必須有反彈。這意味著(zhù)對球場(chǎng)上界一個(gè)交配一雙，空間

寬對齒輪必須稍微大于齒厚對齒輪，并

反之亦然。對儀器裝備，反彈是可以消除用齒輪分裂下跌

其中，其中一半被腐表相對其他彈簧勢力分裂齒輪

牙齒占據全寬的小齒輪的空間。

螺旋齒輪具有一定的優(yōu)勢;舉例說(shuō)，當連接軸平行

他們有較高的承載能力比齒輪具有相同齒數

切與上年刀。由于重疊行動(dòng)的牙齒，他們是

暢順行動(dòng)，并可以操作的音調較高線(xiàn)速度比齒輪。該

漆黑的夜里，線(xiàn)速度，是速度的草地循環(huán)。由于牙齒傾向于向

旋轉軸，螺旋齒輪創(chuàng )造一個(gè)軸向推力。若單用，這個(gè)推力必須

沉醉于軸軸承。推力問(wèn)題，是可以克服的，由切割兩套

反對的螺旋齒就同一空白。根據制造方法，

齒輪可能會(huì )持續齒魚(yú)骨型品種或雙螺旋齒輪

同一個(gè)空間之間的兩半，以準許刀具，以一發(fā)不可收拾。雙螺旋

齒輪非常適合高效率傳輸功率高速。

螺旋齒輪也可以被用來(lái)連接非平行，不相交的豎井任何

角度對另外一個(gè)人。 90度，是最常見(jiàn)的角度，在這種齒輪

用。

蝸桿與錐齒輪。為了實(shí)現線(xiàn)接觸和改善

承載能力的交叉軸螺旋齒輪，齒輪，可向曲線(xiàn)

部分周?chē)男↓X輪，在一定以同樣的方式一個(gè)螺母信封螺絲釘。該

結果將是一個(gè)圓柱蝸桿和齒輪。

蝸桿齒輪客戶(hù)提供最簡(jiǎn)單的方式獲得大比率，在一個(gè)單一的一雙。

他們通常效率較低，比平行軸齒輪，不過(guò)，由于一個(gè)

額外滑運動(dòng)，沿牙齒。由于其相似性，效率

55

一蝸桿和齒輪取決于同樣的因素，因為效率的螺絲釘。

單一線(xiàn)程蠕蟲(chóng)的大直徑有小鉛角度和低效率等。

多線(xiàn)程的蠕蟲(chóng)有較大的鉛角度和更高的效率

求英文高手幫我翻譯一個(gè)文章（漢譯英，機械類(lèi)）

求英文高手幫我翻譯一個(gè)文章（漢譯英，機械類(lèi)）

懸賞分：10 - 離問(wèn)題結束還有 14 天 23 小時(shí)

Mechanics Components

Charles W. Beardsley

Gears

Spur and helical gears. A gear having tooth elements that are straight and parallel

to its axis is known as a spur gear. A spur pair can be used to connect parallel shafts only.

Parallel shafts, however, can also be connected by gears of another type, and a spur gear

can be mated with a gear of a different type.

To prevent jamming as a result of thermal expansion, to aid lubrication, and to

compensate for unavoidable inaccuracies in manufacture, all power-transmitting gears

must have backlash. This means that on the pitch circles of a mating pair, the space

width on the pinion must be slightly greater than the tooth thickness on the gear, and

vice versa. On instrument gears, backlash can be eliminated by using a gear split down

its middle, one half being rot table relative to the other A spring forces the split gear

teeth to occupy the full width of the pinion space.

Helical gears have certain advantages; for example, when connecting parallel shafts

they have a higher load carrying capacity than spur gears with the same tooth numbers

and cut with the same cutter. Because of the overlapping action of the teeth, they are

smoother in action and can operate at higher pitch-line velocities than spur gears. The

pitch-line velocity is the velocity of the pitch circle. Since the teeth are inclined to the

axis of rotation, helical gears create an axial thrust. If used singly, this thrust must be

absorbed in the shaft bearings. The thrust problem can be overcome by cutting two sets

of opposed helical teeth on the same blank. Depending on the method of manufacture,

the gear may be of the continuous-tooth herringbone variety or a double-helical gear

with a space between the two halves to permit the cutting tool to run out. Double-helical

gears are well suited for the efficient transmission of power at high speeds.

Helical gears can also be used to connect nonparallel, non-intersecting shafts at any

angle to one another. Ninety degrees is the commonest angle at which such gears are

used.

Worm and bevel gears. In order to achieve line contact and improve the

load-carrying capacity of the crossed axis helical gears, the gear can be made to curve

partially around the pinion, in somewhat the same way that a nut envelops a screw. The

result would be a cylindrical worm and gear.

Worm gears provide the simplest means of obtaining large ratios in a single pair.

They are usually less efficient than parallel-shaft gears, however, because of an

additional sliding movement along the teeth. Because of their similarity, the efficiency

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of a worm and gear depends on the same factors as the efficiency of a screw.

Single-thread worms of large diameter have small lead angles and low efficiencies.

Multiple-thread