Green Rabbit
Aluminum
- Joined
- Nov 16, 2014
- Location
- Seattle, WA
Long story short, I have a T&C grinder with ball ways somewhat worn, with track in the ball way which is probably 2-3 thou deep.
short of (expensive) regrinding, I read that restoring accuracy is possible using larger balls - so I am thinking of using 7/8 balls instead of 3/4 which are currently there.
But, there are couple of issues I see:
First, the ways use two V-s on one side, and V with flat way on the other side. Larger ball will help on V ways, but on the flat that ball will stay exactly in the same worn path.
Second, larger ball will not raise both sides identically. I made some calculations, and using 0.125" ball size increase will add additional 0.026" per V assuming it is 90 degree angle. so on the side with two V-s will be 0.026" higher than the other.
what is the best way to compensate for both issues? the only thing came into my mind is epoxying 0.025" full hard shim stock on the top surface of the flat way.. don't know if it will hold though, or may press the shim back to the worn groove.
are there any better methods?
Thinking of it, grinding 0.004" from the flat way (to remove the worn groove), and then using 0.03" shim stock under it sounds most promising, but unfortunately I don't have access to a surface grinder to regrind the flat way.
short of (expensive) regrinding, I read that restoring accuracy is possible using larger balls - so I am thinking of using 7/8 balls instead of 3/4 which are currently there.
But, there are couple of issues I see:
First, the ways use two V-s on one side, and V with flat way on the other side. Larger ball will help on V ways, but on the flat that ball will stay exactly in the same worn path.
Second, larger ball will not raise both sides identically. I made some calculations, and using 0.125" ball size increase will add additional 0.026" per V assuming it is 90 degree angle. so on the side with two V-s will be 0.026" higher than the other.
what is the best way to compensate for both issues? the only thing came into my mind is epoxying 0.025" full hard shim stock on the top surface of the flat way.. don't know if it will hold though, or may press the shim back to the worn groove.
are there any better methods?
Thinking of it, grinding 0.004" from the flat way (to remove the worn groove), and then using 0.03" shim stock under it sounds most promising, but unfortunately I don't have access to a surface grinder to regrind the flat way.