03-05-2017, 11:15 AM
Two jobs done this weekend - both for mates.
Job one - repair for the wire feed on a mig welder. Poor design, as the roller is unsupported at the end where the tensioning roller pushes on the wire. The result is that the shaft tips inside the needle roller bearing causing wear to the shaft. The net result is that you can no longer get sufficient pressure on the wire to feed. You can see the worn section quite clearly.
I couldn't make a new shaft, for obvious reasons but I could cut out the worn section and replace it. So that is what I did. No access to a 4-jaw chuck, so I indicated the part in the mill and drilled a 7mm hole through the centre.
Next the ends that I need to keep were parted off in the lathe.
To ensure concentricity, the new section was turned in one process.
Finally, it was welded together and the ends cleaned up.
Job two - modify the sling mount on an old side by side 12ga hammer shotgun. This is the one that is screwed into the web between the two barrels. I had already milled off the old mount before I thought to take pictures. So here is the bracket alongside the new mount.
I made up a quick jig to hold the parts in the correct orientation for welding and milling.
The finished product.
Job one - repair for the wire feed on a mig welder. Poor design, as the roller is unsupported at the end where the tensioning roller pushes on the wire. The result is that the shaft tips inside the needle roller bearing causing wear to the shaft. The net result is that you can no longer get sufficient pressure on the wire to feed. You can see the worn section quite clearly.
I couldn't make a new shaft, for obvious reasons but I could cut out the worn section and replace it. So that is what I did. No access to a 4-jaw chuck, so I indicated the part in the mill and drilled a 7mm hole through the centre.
Next the ends that I need to keep were parted off in the lathe.
To ensure concentricity, the new section was turned in one process.
Finally, it was welded together and the ends cleaned up.
Job two - modify the sling mount on an old side by side 12ga hammer shotgun. This is the one that is screwed into the web between the two barrels. I had already milled off the old mount before I thought to take pictures. So here is the bracket alongside the new mount.
I made up a quick jig to hold the parts in the correct orientation for welding and milling.
The finished product.
Hunting American dentists since 2015.