推荐回答（4个）
平口虎钳的定位:先将要来放置平口虎钳的位置(基本上要平的)清理干凈, 再上一层防锈油,将平口虎钳的底部清理干凈, 上一层防锈油,将平口虎钳放置在预定要来放置平口虎钳的位置上, 平口虎钳的手柄靠向工作者自已, 目视钳口的两个平面各自向工作者自已的左右手方向大致平行,将平口虎钳两侧的两个固定螺丝的旋钮(也有些平口虎钳是用六角螺丝螺母的)须时针方向轻轻适度锁上, 以便初步固定平口虎钳,如平口虎钳是用作钳工的, 只要:用水平尺调校XY平面方向的水平, 如不平便旋钮反时针旋松, 用适合厚度的薄铁片垫在平口虎钳钳口面较低的位置的底部, 将平口虎钳两侧的两个固定螺丝的旋钮(也有些平口虎钳是用六角螺丝螺母的)顺时针方向适度轻轻锁上, 以便初步固定平口虎钳,重复上述5.a的动作, 一直调至当水平尺放在平口虎钳的钳口上时, 不论X方向和Y方向, 水平尺上的气泡都在其气泡管上的两个刻记的中央位置,将平口虎钳两侧的两个固定螺丝的旋钮(也有些平口虎钳是用六角螺丝螺母的) 顺时针方向用力锁上, 平口虎钳的定位便完成了!6. 如平口虎钳是安装在机床上的, 便要:a. 先用水平尺检查机床的XY平面方向的水平, 如不够水平便调整机床水平,b. 将上述的1., 2., 3., 4., 步骤完成c. 用水平尺初步调平口虎钳的XY平面方向的水平, 如不平便把旋钮(螺丝)反时针适度旋松, 用适合厚度的塞规片垫在平口虎钳钳口面较低的位置的底部, 将平口虎钳两侧的两个固定螺丝的旋钮(也有些平口虎钳是用六角螺丝螺母的)须时针方向轻轻锁上, 以便初步固定平口虎钳,d. 用秒表固定机床的Z轴上,移动机床的Z轴,使秒表轻触平口虎钳的钳口凹位的底部,预压少许深度, 移动机床的XY轴作精密检测, 分别看看X方向和丫方向在某固定行程的水平偏差, 用三角法算出要垫塞规的厚度误差, 按计算值增加或减少塞规的厚度(老机床, 有时甚至要在其他位置另垫塞规), (操作时要小心, 不要碰坏秒表!!!)e. 重复上述6.d的动作, 一直调至当使用秒表固定机床的Z轴上,然后移动机床的XY轴作精密检测时,不论X方向和Y方向在某固定行程的尺寸偏差值都在设定的要求精度内为止, f. 用秒表固定机床的Z轴上, 移动机床的Z轴,使秒表轻触平口虎钳的钳口凹位的固定侧的内侧面作精密检测,分别看看Z方向和Y方向在某固定行程的尺寸偏差,用胶锤或铜轻敲平口虎钳的侧面,使钳身轻微适度旋转以减少上述的尺寸偏差, 将平口虎钳两侧的两个固定螺丝的旋钮(也有些平口虎钳是用六角螺丝螺母的) 顺时针方向较用力锁上, g. 重复上述6.e, 6.f的动作, 一直调至当使用秒表固定机床的Z轴上,然后移动机床的XYZ轴作精密检测时,不论X方向、Y方向和Z方向在某固定行程值都在设定的要求精度内为止,此时平口虎钳的定位便完成了!
平口虎钳的定位是靠钳台旁边的两个“定位旋钮”。将两个定位旋钮反时针旋松后，就可以水平转动虎钳的方向---角度；调整好角度后再把定位旋钮扭紧；就固定好了。
平口虎钳的固定钳口是由平面组成,其平面与工件定位面接触,与固定钳口相对的活动钳口起夹紧作用。 使用时，将平口钳至于机床工作台上以定位键定位后紧固，将工件置于两钳口垫之间，转动扳手使之夹紧。
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