A new liner on the mating way, then scraped in.
The liner goes on the saddle, the way in the bed stays. I scrape the two in together until the contact is even across the whole surface.
The liner sits on the saddle’s mating way and runs on the way in the bed. When it is worn out or has come loose, or no longer fits after the way has been rescraped, I replace it.
A new liner only bears once it is scraped in. So I spot it against the way it will run on and rework it by hand until the contact is even across the whole surface.
How is a way liner replaced?
The old liner comes off the saddle, a new one goes on, and I scrape it in against the way in the bed until the contact is even across the surface.
The mating way
Before the new liner goes on, I spot and measure the way in the bed. If it has worn low, I scrape it first.
Scraping in
The new liner is spotted against the way and scraped in by hand until the contact is even across the full surface. Then I set the gib to the new size.
Measuring
Finally I measure the saddle’s travel along the way with a dial indicator. You get the readings as an inspection report.
What the job includes
- Way in the bed measured, scraped first where needed
- Old liner removed, new one applied
- Liner scraped in against the way
- Gib adjusted, saddle travel measured
When does a way liner need replacing?
Stick-slip
The saddle sticks and then jumps instead of starting smoothly, most clearly at slow feeds.
Play in the gib
The gib is adjusted all the way in, and the saddle still has play.
Liner loose or chipped
The liner has come loose at the edge or has broken out in places.
Way rescraped
The way in the bed has been scraped, and the old liner no longer fits it.
Frequently asked questions
1. Does the way in the bed have to be scraped too?
Only if it has worn low. I spot and measure it before the new liner goes on, and the measurement decides.
2. When is adjusting the gib no longer enough?
When the gib is adjusted all the way in and the saddle still has play. Then adjusting won’t help any further, and the liner has to be replaced.
3. What does way liner replacement cost?
The price is agreed separately for each machine. There is no price list. Tell me on the phone which machine it is and what it is doing.