| R | |
| rack and pinion | 齒條和齒輪 |
| radial sawing | 徑線鋸法 |
| raised head screw | 凸頭螺絲 |
| raising | 打凸成形 |
| ram | 滑枕 |
| random access memory(RAM) | 隨機存取存貯器 ;隨機存取記憶體 |
| rapid traverse | 快速移位 |
| rasp | 木銼 |
| ratcher brace | 棘齒弓鑽 |
| ratchet | 棘齒 |
| ratchet and pawl | 棘輪和爪 |
| rating | 額定值 |
| raw material | 原料 |
| reactance | 電抗 |
| reactive component | 抗性分量 ;無功分量 |
| read only memory (ROM) | 唯讀存貯器;唯謮記憶體 |
| realization | 實踐計劃 |
| ream | 令(紙張的計數單位) |
| reamer | 鉸刀 |
| reaming | 鉸孔 |
| rebate | 槽口 |
| rebate plane | 邊鉋 ;槽口鉋;子口鉋 |
| recess | 凹座 |
| reciprocatory motion | 往復式運動 |
| rectangular die | 方型牙板 |
| reCtangular tube | 長方通 |
| rectangular waveform | 矩波形 |
| rectification | 整流 |
| rectilinear motion | 直線運動 |
| reduction | 縮版 ;縮圖 |
| reduction process | 減除作業 |
| redundant member | 冗餘構件 |
| reflection | 反射 |
| refractory block | 耐火磚 |
| regulating | 調節 |
| reinforced concrete | 鋼筋混凝土 |
| reinforced plastics | 強化塑膠 |
| reinforcement | 強化 |
| reinforcing agent | 增強劑 |
| relative density | 相對密度 |
| relay | 繼電器 |
| release agent | 脫模劑 |
| relief | 浮雕 |
| rendering technique | 演繹技術(設計) |
| research | 研究探討 |
| resilience | 回彈 |
| resin | 樹脂 |
| resin casting | 水晶膠的鑄造成形 |
| resin glue | 樹脂膠 |
| resistance | 電阻值 |
| resistance thermometer | 電阻溫度計 |
| resistivity | 電阻率 |
| resistor | 電阻器 |
| resonance | 共振 ;共鳴 ;諧振 |
| resonance | 諧振 ;共振 ;共鳴 |
| restoring couple | 回復力偶 |
| restoring force | 回復力 |
| resultant force | 合力 |
| retentive ferromagnetic material | 頑磁性鐵磁材料 |
| reverse biased | 反向偏壓 |
| reversible process | 可逆過程 |
| revolution per minute(r．p．m ) | 每分鐘轉數 |
| rhythm | 節奏 ;韻律 |
| rib | 肋條 |
| rigid body | 剛體 |
| rigidity | 剛性 ;剛度 |
| ring mandrel | 介指鐵 |
| rip saw | 直紋鋸 |
| ripping fence | 欄板 |
| rivet | 鉚釘 |
| rivet set & snap | 鉚釘模 |
| riveted joint | 鉚釘接合 |
| riveting | 鉚接 |
| riving knife | 劈刀 |
| robot | 機器人 |
| rod | 枝 ;桿 |
| roller bearing | 滾子軸承 |
| rolling | 滾壓 ;轆壓 |
| rolling friction | 滾動摩擦 |
| root | 樹根 |
| root mean Square value | 均方根值 |
| rosewood | 花梨木 |
| rotary motion | 旋轉運動 |
| rotating platform | 旋轉台 |
| rotatIng shaft | 旋轉軸 |
| rotation | 旋轉 ;轉動 |
| rotational energy | 轉動能 |
| rotor | 轉子 |
| round faced spokeshave | 圓底彎鉋 |
| round file | 圓銼 |
| round head screw | 圓頭螺絲 |
| round nose gouge | 圓頭弧刀 |
| round nose pliers | 圓咀鉗 |
| round rod | 圓枝 |
| round tongs | 圓口夾鉗 |
| round tube | 圓通 ;圓管 |
| router | 槽鉋 ;槽鉋機 |
| router plane | 平槽鉋 |
| routing | 打線 ;打槽 |
| routing machine | 打槽機 |
| rubber | 橡膠 |
| rubber band | 橡皮圈 |
| rubber cement | 生膠漿 |
| rughing | 粗削 |
| ruler;straight rule | 直尺 |
| ruling | 刻度 ;劃線 |
| rust | 鐵銹 |
| rust prevention | 防銹 |