- Joined
- Oct 31, 2015
- Messages
- 23
I was setting up my Logan 1825 to try some turning between centers a few weeks ago and popped in a new MT3 dead center only to find that it was running out about .005" at the tip. So, after taking a good look at the taper in the spindle, I noticed and could also feel some high spots from galling or embedded chips on the taper surface. I worked on these with a small triangular deburring tool and also tried polishing the taper with some 600 grit wet dry sand paper. After cleaning things up, the problem was still there. What to do......
After some googling and research, I decided to look for a MT3 reamer. I found a listing on ebay for a couple of NOS Soviet era tapered reamers from the Ukraine. The listing was for a pair MT2 and MT3 finishing reamers for $50 shipped. So I ordered them up and received them about 2 weeks later. They were wrapped in some type of oily rust proofing paper and shipped in a foam box. I cleaned them up and found them to be nice and sharp.
I then set the MT3 reamer loosely in the headstock spindle taper bore and popped a good dead center in the tail stock. I slid the tail stock over and verified that it was aligned closely at that position on the bed. Next, I extended the tail stock quill to lightly support the tapered reamer. I then used a 8" crescent wrench to turn the reamer a few revolutions while very slightly extending the tail stock. The reamer caught on a couple of spots and then turned more freely. i removed the reamer and cleaned the taper bore. A visual inspection showed the reamer had made contact with a large percentage of the taper.
I popped in the MT3 dead center and was rewarded with a runout of about .0003". Good enough for me.
Best Regards
Jim Zellmer
After some googling and research, I decided to look for a MT3 reamer. I found a listing on ebay for a couple of NOS Soviet era tapered reamers from the Ukraine. The listing was for a pair MT2 and MT3 finishing reamers for $50 shipped. So I ordered them up and received them about 2 weeks later. They were wrapped in some type of oily rust proofing paper and shipped in a foam box. I cleaned them up and found them to be nice and sharp.
I then set the MT3 reamer loosely in the headstock spindle taper bore and popped a good dead center in the tail stock. I slid the tail stock over and verified that it was aligned closely at that position on the bed. Next, I extended the tail stock quill to lightly support the tapered reamer. I then used a 8" crescent wrench to turn the reamer a few revolutions while very slightly extending the tail stock. The reamer caught on a couple of spots and then turned more freely. i removed the reamer and cleaned the taper bore. A visual inspection showed the reamer had made contact with a large percentage of the taper.
I popped in the MT3 dead center and was rewarded with a runout of about .0003". Good enough for me.
Best Regards
Jim Zellmer