I was making a bracket for my neighbour the last few days for his gas powered cut off saw that had broken. I could have tried welding it, but it was a light cast aluminum and didn't feel it would last very long on the machine with all of the vibration. Near the end of the machining I heard a grinding sound in the head of my milling machine. Today I took apart the right angle drive.
On the bench and cleaned are the parts in the head. The bearings are rough and over the years I have had a problem with the drive between the miter gear and the spindle. What was found was that the key had broken in two and fell into the bottom of the casting. My solution years ago was to make another key and thought until now that the key floated in the key way when positioning the Quill. Hence the long key you see here. What I found today was that the key was held in place by a pin so that it would not move up or down in the key way on the drive side.
The hole for the pin is behind inner bearing race that retains the key from moving up and down. All of the little bits of key have ended up in the bearings and they are shot.
The bearings are NSK 6008 and engraved is the letters "P5" on each bearing. I wonder if this means they are a matched set? The 6008 bearing is a deep groove bearing, possibly for higher radial loading?
So it looks like a trip to Canadian Bearings in Hamilton tomorrow. The right angle drive is not in an oil bath, but has an oiler on top ( spring loaded ball ). It also has a knurled ring that applies pressure to the brass cone to adjust the mesh of the miter gear. The spindle bearings are totally independent of the drive and power is transmitted to the spindle by 3/16" key. If I am looking at this wrong, please chime in. Thanks.
TonyK.
Grimsby Ontario Canada.
On the bench and cleaned are the parts in the head. The bearings are rough and over the years I have had a problem with the drive between the miter gear and the spindle. What was found was that the key had broken in two and fell into the bottom of the casting. My solution years ago was to make another key and thought until now that the key floated in the key way when positioning the Quill. Hence the long key you see here. What I found today was that the key was held in place by a pin so that it would not move up or down in the key way on the drive side.
The hole for the pin is behind inner bearing race that retains the key from moving up and down. All of the little bits of key have ended up in the bearings and they are shot.
The bearings are NSK 6008 and engraved is the letters "P5" on each bearing. I wonder if this means they are a matched set? The 6008 bearing is a deep groove bearing, possibly for higher radial loading?
So it looks like a trip to Canadian Bearings in Hamilton tomorrow. The right angle drive is not in an oil bath, but has an oiler on top ( spring loaded ball ). It also has a knurled ring that applies pressure to the brass cone to adjust the mesh of the miter gear. The spindle bearings are totally independent of the drive and power is transmitted to the spindle by 3/16" key. If I am looking at this wrong, please chime in. Thanks.
TonyK.
Grimsby Ontario Canada.
