The drive assembly to my cement mixer has finally given up. Unfortunately neither I or the previous owner ever used the Zerk fitting to lubricate the drive. The drive is a 3/4 inch shaft with a 3" gear on one end and an 18" pulley on the other. Am going to have to machine a new shaft and housing. Housing will be welded to the frame, as is the existing housing.
This link is a picture of the shaft-gear assembly.
Questions: If I can not press out the old shaft, how do I center a 9-tooth gear in the lathe. I have both 3 and 4 jaw chucks. Don't have a boring bar 6" long. Can this somehow be done from both ends and still end up with a concentric bore? How do I modify the shaft so that it can take grease? Do I file a continuous spiral? Do I do it to the sleeve? New shaft will have a new Zerk fitting.
Keep in mind the following. Have 13" lathe and a large mill. This is a very low rpm assembly and does not require very much torque. Even with drum full of 200 lbs ± of concrete, you can rotate it quite easily by hand. Drum IS NOT supported by this mechanism. It is simply a drive.
Thanks for any and all advice.
Ivan Vegvary