Replacing the FP! X axis slow feed gears

Hi All,

I`ve been putting off rebuilding Helga`s X axis slow feed assembly for a long time now! The reason for this procrastination (lovely word) is that in removing the damaged gears that were jammed in position, partly due to my lack of knowledge, the small driving gear was badly mauled and the bronze bearing that supports this gear had to be driven down to allow removal of the side gears so that I lost the settings!



Above you can see the damaged gears sitting in that cramped little pocket in the casting!



Above you can see the damaged gear just prior to being removed from the shaft. You can see the bronze bearing and the hardened steel thrust washer as well below the gear but pushed further down to allow dis-assembly.



Above you can see the damage to the gear and the shaft. What had happened was that the gear had revolved on the shaft about 360 degrees, shearing the taper pin so that driving out the pin was not possible. this could not be seen from just looking at the gear and it was not loose on the shaft as the shearing of the pin had the effect of packing the removed metal against the bore of the gear and jamming it together with the shaft it took a very long time, working in that tight space, to extract the gear from the shaft and it was only then that I was able to see what had happened!



Above can be seen the status of the end of the drive shaft. A large amount of metal has been removed and I set the shaft up in the 4 jaw to remove the expanded metal in the centre of the gear mounting diameter. there is a portion of the original diameter left where the bottom of the gear is situated and also around the shaft where the top of the gear is located so that the new gear will run true with the shaft.
The painful decision that I have to make is whether to risk pinning the gear through what is left of the shaft in that area!

Alan

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