Posted by Tom in Iowa City on March 01, 2011 at 16:27:21 from (173.30.220.194):
For those who haven't followed my progress, I am seeking to take up the rotational slack in the transmission spline shaft, that between the shaft and the transmission connection (hub). One illustration, below, shows the gaps. I was able to find a good used hub, but not a new spline shaft. Another image shows the severe wear in the splines. After consulting with a dental technician friend of mine and using my dentist background, we came up with a plan. We are going to make custom shims to fit the gaps. After lubricating the shaft male and female parts with a light grease, patterns were made by pumping in methyl methacrylate powder-liquid mix into each area. A roughed wire was used to support the acrylic and form a handle for removal and manipulation. This acrylic is used to make patterns for dental inlays and crowns. The acrylic sets up in about 15 minutes. These patterns will be invested in a dental refractory material that withstands high heat. Then, using the lost wax process, the acrylic will be burned out of the molds and a casting made. The metal we will use will be a chrome-cobalt or nickel chromium alloy. This alloy is extremely hard and tough. This should serve as a good repair. The castings will be either Loctited to place with 604 (for press fit) or not. In any event, the washer at the end of the spline shaft will prevent the shims from coming out. This will possibly we the first tractor to have a dentistry connection. And, my tractor will be speaking Japanese, as I am replacing the clutch pilot bearing with a Japanese bearing (Onyo, I believe)to replace the New Departure bearing. After all, it is INTERNATIONAL Harvester Company. Tom
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