| 单词 | roller bit |
| 释义 | > as lemmasroller bit roller bit n. (a) Saddlery a kind of bit with a rotating ball or bead fitted on the mouthpiece; (b) Mechanics a drilling bit in which the cutting teeth are on rotating conical or circular cutters, used chiefly in the oil industry. ΘΚΠ society > occupation and work > equipment > oil and natural gas recovery equipment > [noun] > drilling equipment > drilling bits roller bit1858 rock bit1875 spudding bit1907 underreamer1912 oil string1921 spudder1922 1858 Househ. Words 10 July 84/1 The zebra has required as much taming as a hundred horses, and now the huge wooden roller-bit has been discarded..follows him around the ring in a plain snaffle. 1913 Bull. Univ. Texas No. 307 21 Below 2307 feet the roller bit was used, being found much superior, when in order, to other bits for drilling in limestone or other moderately hard rock. 1924 L. C. Uren Textbk. Petroleum Production Engin. vi. 152 The Reed roller bit..is equipped with eight disc-shaped cutters having teeth milled around their circumference and mounted in a massive steel frame. 1969 Daily Rev. (Hayward, Calif.) 28 Mar. 36/1 (advt.) Quarter horse, bay gelding, 6 yrs. old, with roller bit. 2005 R. D. Singh Princ. & Pract. Mod. Coal Mining iii. 77 The different types of bits used in rotary drilling are drag bit, roller bit, diamond bits, etc. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。