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Random files - Jim Allen's Gallery |
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Bell valve assembly793 viewsThe fully balanced valve turns on a bushing & a ball bearing, which takes any thrust load. Notice the oil groove in the face of the back end for additional lubrication. The ball bearing & the bushing are also lubricated from an oil hole in the intact tract. A new valve is being built that has a total opening of 137 deg. It opens 24 deg ABDC & close 63 deg ATDC with the window in the case still at 82 deg. This gives a total duration of 219 deg with a total wide open duration of 55 deg. FOUR VERY IMPORTANT FEATURES; AN UN-OBSTRUCTED WINDOW OPENING FOR AT LEAST 45 DEG OF ROTATION; MAXIUM CRANKCASE PACKING; AN EXCELLENT TIME AREA NUMBER BECAUSE THE VALVES WINDOW IS LOCATED ON ITS CIRCUMFERENCE & VERY LOW DRAG; ENABLE THIS VALVE TO GIVE LARGE HP INCREASES, ON ANY SIZE ENGINE. There is a leading tether car, boat racer from California who has tested this valve with the same results. Jim Allen
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torque cradle using Dynamax fun for load937 viewsThe load is varied by changing the size of the opening to the fan. Notice the air outlets on the circumference of the fan housing directing the escaping air away from the torque cradle. With the craddle locked by the black delrin block, the engines needle is set for maxium rpm. Then the cradle is released, & the swing position of the weight is noted by the pointer assembly. After the engine is stopped, a beam type torque wrench is placed in the nose cone & the entire unit is rotated for the torque amount.Jim Allen
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563 viewsAll the internal parts of the carburetor are made of 303 stainless. The carburetor meters fuel automatically as the barrel is closed & has a .0625 dia. stop pin in the outside of the rotating barrel which engages the machined circular grove in the .032 thick side plate. This feature controls the full open & closed positions. The needle valves have precision ground tapers & are made of 52100 full hard steel gage pins. The needle valve retainer spring is made of fully hardened beryllium copper. A new design needle valve is being built which will eliminate the problems associated with non-concentric tapered needle valves.Jim Allen
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.156 thick rotor434 viewsThis rotor is the same as the .125 thick rotor mounted in a previous picture. Notice its center has been relieved .015 deep on both sides in order to keep it centered inside the dyno housing & also keep the .250 thick clamping hubs in the same position. By using pockets, rather than holes, & alternating pocket locations from side to side, (the reason for the two dowel pin locations) a total of 48 pockets can be machined in the rotor faces. With a .125 thick rotor mounted, the clearance from the rotor face to the housing inside face is .0312 in. With a .1562 thick rotor mounted, the clearance is .0156 in. Jim Allen
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Progressive pitch anvils766 viewsThese anvils are used to make different amounts of progressive pitch. They are held rigidly in a machinist vise & a dead blow rubber mallet is used on the back side of each blade. NO NICKS OR DINGS to be removed on the inside or outside of blade surfaces with this method! Jim Allen
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628 viewsThis dedicated fixture is used to grind crank pin holes in through hardened crankshafts. The crank pins used are full hard M-2 steel & are a .0012 to .0014 press fit. The press fitting operation is done with a fixture to insure alignment when starting the crank pin in the ground hole. The crankshafts are made of AISI S-7 shock resisting tool steel; tensile strength is 285,00 p/si; yield strength is 220,000 p/si; hardness is 53 rockwell Rc; with a Charpy impact value of 219 ft lbs. This fixture could also be used to grind a one piece crankshafts crank pin; including the induction valve driver. The crank throw of this fixture is fixed at .9020.
A fixture like this assures that every crank is exactly the same!Jim Allen
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401 viewsThrottle arms before & after bending.Jim Allen
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Crankcase boring fixture616 viewsNotice that the clamps are designed to be below the area of the crankcase where the round profilling must be done.Jim Allen
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141 viewsThe aluminum piece on the left will become a taper master. It can be used to quickly & accurately re-set the compound for cutting tapers. Jim Allen
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Last additions - Jim Allen's Gallery |
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348 viewsCompleted pieces are all interchangeable & after mounting to the flywheel are within +-.0002 concentricity 1.000 in from the split collets face. The same type of a flanged piece with six mounting holes is made when I set up ball and pin universals for solid shaft applications. When using the solid shaft method the thrust is driven up the entire shaft into the engine by using hardened thrust washers between the ball ends & there sloted ends. Jim AllenSep 28, 2007
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285 viewsThese spring steel washers will prevent any galling of the clamping nut, even when it is tightened with great force.Jim AllenSep 28, 2007
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299 viewsMachine an arbor; fasten pieces securely; machine the OD with carbide. Finished washers have no burs on the OD or ID & are very precise.Jim AllenSep 28, 2007
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312 viewsAfter clamping .010 thick spring steel pieces between two aluminum pieces, they are machined square to a convienent size. Boring with carbide gives a clean hole without burs. Jim AllenSep 28, 2007
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316 viewsThis photo shows the locking nut being singled pointed internally. This piece does not have to be hardened because it will ride against the spring steel washer when tightening the split collet. It is made of #316 stainless steel.Jim AllenSep 28, 2007
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300 viewsThe collet holding fixture is made of #316 stainless steel & is not hardened. Jim AllenSep 28, 2007
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270 viewsThe split collets are ground internally while being held in the fixture directly above them. External grinding was proved to be un-necessary.Jim AllenSep 28, 2007
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368 viewsThis photo shows the back ends of the split collets being ground square to their ID's. This is done in a Suburban Tool Master-Grind. (+-.00005 spindle runout) The split collets are wrung onto a hardened indicated gage pin for this operation.Jim AllenSep 28, 2007
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507 viewsTwo 6-32 SHCS, a precisely machined steel hub on the flywheel face (.5002 OD) & a flange on the tapered sleeve which has a 1.125 in OD (.5000 ID), ensures positive location of the tapered sleeve each time it is mounted. The hub is #316 stainless steel & is shrunk into the flywheel before final machining. Notice the six bolt hole pattern used on the tapered sleeve's flange. This feature allows automatic positioning of the propeller to a horizontal position if the engine should stop suddenly at wide open throttle & prevents the hull from diving! It is used on solid drive shaft setups.Jim AllenSep 28, 2007
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