Cam Ball Race Pair for a Load Cell Zero Check

Two grooved rings that sit on top of Ruge's load cell. Turning the upper one rides its balls up shallow cam ramps and lifts the load a few thousandths of an inch, so the zero can be read without moving the tank.

متوسط

A few hours

التعليمات

Watch: boring a hole on a lathe

Boring a hole step by step on a metal lathe.

Turn two rings

Turn and bore two rings from round bar: the lower to sit on the shell, the upper with a centre opening larger than the piston top.

المواد لهذه الخطوة:

قضيب مستدير من صلب طري1 قطعة

الأدوات المطلوبة:

منشار حديد

مخرطة معادن

قضيب التجويف

زيت القطع

Groove the races

Turn a ball groove in the facing sides, and one in the top of the upper ring for the second row of balls.

الأدوات المطلوبة:

مخرطة معادن

قدمة ورنية

File the cam ramps and bar holes

File the lower groove into very slight ramps, one per ball. Drill a row of recesses round the upper ring's edge for a turning bar.

الأدوات المطلوبة:

طقم مبارد

مثقاب عمودي

ملزمة منضدة

Limits

Ruge's patent gives the part's shape and job but no material or size. Mild steel and silver-solder brazing are our choice; size it to the load you need. Lathe method after Palmateer, Elementary Machine Shop Practice (1918).