Mr Dave Strain, 35 O’Brien Avenue Stouffville, Ontario, L4A 1G6 Dear Mr Strain: Re: DIAMOND-SHAPED FLUID POWER LINKAGE On November 18, 2001 I visited your laboratory to observe the operation of your DIAMONDSHAPED FLUID POWER LINKAGE, perform the collection of data with my TOUR & ANDERSSON calibrated electronic manometer, and discuss some questions you presented. (8) What force is required to move the linkage without the walls of the diamond shaped piston? Four lb. and ten oz. was recorded on the certified digital scale to overcome the inertia. (9) What force is required to move the linkage and the walls of the diamond shaped piston? Nine lb. and twelve oz. was recorded on the certified digital scale to overcome the inertia. The linkage and walls dropped when the force was reduced to 6 lb. on the digital scale. (10) What is the total load for the face of the fluid in the diamond shaped piston model to lift considering the walls, linkage, and the 50 lb. weight? Fifty lb. plus nine lb. and twelve oz. = 59.75 lb. (1) What is the lowest pressure in the diamond shaped actuator that causes an upward lifting motion? I observed the threshold of upper motion to occur at 60" w.g. on the water column. (7) What is the travel to the equilibrium point at 60" w.g. from completely collapsed? The short diameter of the rhombus measured about 1". see note for question 6. (2) Does the electronic certified equipment agree with the 0-5# certified gauge? (3) Does the electronic certified equipment agree with the water column? I used a certified electronic manometer connected in parallel with the 0-5# certified gauge, the water column, and a 0-60" w.g. magnehelic to collect the following data: The 0-5# gauge was within ±1.3% and the 0-60" magnehelic, and the water column were both within ±0.7% of the electronic meter. This data shows quite exceptional agreement when considering the decimals of the analogue instruments are interpolated by eye. 13.280
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