- Joined
- May 10, 2012
- Messages
- 995
I purchase this mill quite some time ago and used it a some. I have since aquired another machine to replace it and decided to get rid of it. It was in bad need of some TLC, so I thougth I would tear it down, clean it up, make any minor repairs it needed and paint it. During the teardown, as I was pressing the shaft that rotates the spindle out of it's housing, this happened:
Joy. I pondered what to do. That support provides radial and axial support in both directions. Brazing it back in was not an option, as I would not have been able to locate it, and it was pretty badly mangled up anyway. I decided to go a different route. This is what the housing looked like before:
The upper recess was 2.25" and the spindle indexes in it. The lower diameter was somewhat larger and as cast. It was also a bit off center. I bored the housing till the lower portion cleaned up, about 2.625.
I then turned a sleeve to a light press fit to go in the hole and drilled it 1" on the inside. This was pressed in with some bearing retainer Loctite and then the remainder of the machining was done on the sleeve. I then pressed in two oilite bushings and it looked something like this
I also needed to modify the shaft, the original shaft was crossdrilled for a pin that engaged a slot in the spindle housing to turn it (I didn't think to take the picture before I cut the end off the shaft):
The end state for the shaft would look something like this:
I nipped the shaft off, drilled and tapped it and cut a 9/32" slot in it (I had a cutter that size):
At this point, I would show you the picture of the completed end piece that goes on the shaft and drives the spindle housing, but my CNC mill crapped out part way through the making of it. I will have to finish it up on the shaper and lathe (with some design mods to accomodate) as I don't have another mill working right now. Most of the job is done and the remainder of the mill is nearly ready for paint and reassembly. The weather here is not accomodating my painting, so it will likely be a few more weeks before it is back together.
Joy. I pondered what to do. That support provides radial and axial support in both directions. Brazing it back in was not an option, as I would not have been able to locate it, and it was pretty badly mangled up anyway. I decided to go a different route. This is what the housing looked like before:
The upper recess was 2.25" and the spindle indexes in it. The lower diameter was somewhat larger and as cast. It was also a bit off center. I bored the housing till the lower portion cleaned up, about 2.625.
I then turned a sleeve to a light press fit to go in the hole and drilled it 1" on the inside. This was pressed in with some bearing retainer Loctite and then the remainder of the machining was done on the sleeve. I then pressed in two oilite bushings and it looked something like this
I also needed to modify the shaft, the original shaft was crossdrilled for a pin that engaged a slot in the spindle housing to turn it (I didn't think to take the picture before I cut the end off the shaft):
The end state for the shaft would look something like this:
I nipped the shaft off, drilled and tapped it and cut a 9/32" slot in it (I had a cutter that size):
At this point, I would show you the picture of the completed end piece that goes on the shaft and drives the spindle housing, but my CNC mill crapped out part way through the making of it. I will have to finish it up on the shaper and lathe (with some design mods to accomodate) as I don't have another mill working right now. Most of the job is done and the remainder of the mill is nearly ready for paint and reassembly. The weather here is not accomodating my painting, so it will likely be a few more weeks before it is back together.