International Waters Community

International Waters Gallery

Another pit box idea

pit box 006.jpg

6 files, last one added on Jul 22, 2006
Album viewed 90 times

precision cable collet assembly


58 files, last one added on Sep 27, 2007
Album viewed 252 times

26 albums on 3 page(s) 3

Random files - Jim Allen's Gallery
Engine building 024.jpg
20,000 rpm gas engine pipe480 viewsJim Allen
628 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 Allen
Deep-Groove Ball Bearing 016.jpg
1071 viewsSome of the different types of front ends that have been tested. The front end mounted to the steel crankcase motor has a threaded nose to allow the use of low clearance bearings. The front end in the background was threaded into the crankcase for increased rigidity. Final assemblies are a .001 shrink fit in their crankcases. The two pieces in the lower right hand corner are sleeves which fit over the crankshaft between the inner races of both bearings. This set up allows the crankshaft & flywheel assembly to be mechanically fastened to the inner races of "both bearings" simultaneously.Jim Allen
Deep-Groove Ball Bearing 001.jpg
Deep Groove Ball Bearing Test Fixture652 viewsThese parts make up the fixture; base with indicator mount; "V" shaped anvil; spring base with red locking knobs; bearing mounts; & different length springs for different size bearings. This fixture can determine the amount of radial play & detect if the races are out of round. It has an accuracy of .0001 to .0002.Jim Allen
torque cradle loading devices 010.jpg
Loading device mounted on the torque cradle's engine shaft890 viewsNotice the fifth flat head screw visible at the bottom of the safety shroud's rear inside surface. This screw is holding the end cap on the main shaft. After engine shut down, a beam type torque wrench is inserted here & the torque can be easily read by duplicating the pointer reading. RPM readings are taken with a laser tachometer from the spinner's reflective square.Jim Allen
672 viewsThis fixture is used to bore the venturi hole (.625 dia); drill the hole for a .0625 dowel pin which holds inside machined tube [throttle arm threaded stud (6-23)]; & metering hole which engages the "V" slot.Jim Allen
gas tank 009.jpg
Inside of the drawn metal piece371 viewsJim Allen
connecting rod 013.jpg
638 viewsA side view which shows the connecting rod blank sitting on the bored locating pins. Screws pass through each pin to hold the blank firmly in place for machining. Jim Allen
dynamometer 011.jpg
water reservoir802 viewsThe water reservoir is designed to always be at full capacity during dyno pulls. Notice the water inlet on the cover & the overflow outlet on the side. Constant pressure is necessary during dyno pulls in order for the pre-set load setting not to change. Jim Allen
piston cut-away 001~1.jpg
Stock OPS 67 crankcase1087 viewsThe steel ring shrunk into the upper crankcase seat area for the liner lip to sit on can be clearly seen. Also notice the front end was threaded & bolted to the crankcase. This crankcase from a 1978 OPS 67 is the only stock motor I ever tested on the dyno. It produced 5.8 to 6.2 HP on 65 % nitro at 24,000 rpm. Every part in this motor was broken at some time!
The steel ring prevented the liner from crushing the lip in the crankcase.
Jim Allen

Last additions - Jim Allen's Gallery
834 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 27, 2007
695 viewsThese spring steel washers will prevent any galling of the clamping nut, even when it is tightened with great force.Jim AllenSep 27, 2007
710 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 27, 2007
503 viewsJim AllenSep 27, 2007
616 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 27, 2007
628 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 27, 2007
582 viewsThe collet holding fixture is made of #316 stainless steel & is not hardened. Jim AllenSep 27, 2007
558 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 27, 2007
669 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 27, 2007
974 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 27, 2007