Turcite B for Lathe Guideways and Gib Strips
On a lathe the carriage rides the bed ways for the whole life of the machine, and the bed is the first surface to wear. Bonding a Turcite B liner to the saddle and gib strips restores the sliding interface without scrapping the bed, and it removes the stick-slip that shows up as chatter marks at low carriage feed.
The three interfaces that wear on a lathe
A conventional lathe has a prismatic or flat bed with a carriage saddle running on it, cross-slide ways on top of the saddle, and a tailstock that slides on the same bed. The saddle ways take the cutting force; the cross slide takes the facing load; the tailstock ways mostly take weight and alignment.
Wear is rarely even. The saddle wears hardest near the headstock where most turning happens, which is why an old lathe cuts a taper on a long shaft: the carriage drops as it approaches the worn zone. Relining redistributes that contact across the full length of the strip rather than only on the unworn ends.
Gib strips and clearance
The gib is the wedge that takes up clearance on a dovetail or box way. When the way wears, the gib is driven in further and the slide becomes tight at the ends and loose in the middle. Relining the sliding face and re-setting the gib afterwards restores uniform clearance along the travel.
Clearance calculation is a real step, not a rule of thumb: the liner thickness, the amount machined off the way, and the gib adjustment range all interact. Set the gib after the liner is finished, never before, or the slide will be preloaded against the bond line.
Oil grooves and lubrication
A PTFE liner tolerates poor lubrication far better than bare cast iron, but it still needs oil to carry wear debris away and to keep the face cool. Grooves are cut into the finished liner face and connected to the lubrication circuit so that oil spreads across the full contact area.
If the original oil distribution was marginal, a reline is the moment to correct it. A liner with a good groove pattern and a working pump will outlast one that was fitted perfectly but starved of oil, and the difference is visible within months in the contact pattern.
Materials for lathe work
Blue grade is the general-purpose choice for saddle and cross-slide faces. Brown grade is often specified on rebuilds where the machine is being brought back to original geometry after years of wear. Spotting paste goes with either: after the liner is machined, contact is checked against the bed and corrected by scraping before the machine is put back into service.
- Saddle and carriage faces on the bed ways
- Cross-slide ways on top of the saddle
- Gib strips on dovetail and box ways
- Tailstock sliding faces where alignment has drifted
Materials for this application
- Turcite B Replacement Blue — All-purpose low-friction slideway strip for machine tool guideways.
- Turcite B Replacement Brown — Brown slideway tape for guideway repair and machine rebuilds.
- Tuschierpaste — Spotting paste for hand scraping and guideway contact checking.
Technical guides for this machine
- Gib Strip Relining: How to Set Clearance from Measured Wear
- Slideway Lubrication and Oil Grooves: Matching Way Oil to PTFE Liners
- Uneven Guideway Contact Pattern: Diagnose Pressure and Alignment Before Relining
Frequently asked questions
- Can I reline only the saddle and leave the bed as it is?
- Only if the bed ways are still straight and free of steps. The liner follows the surface it is bonded to and then gets machined flat, so a worn bed will produce a liner that is flat but no longer parallel to the original axis. Light wear can be tolerated; a visible step usually means the bed has to be machined first.
- How do I stop the carriage binding after relining?
- Check the gib clearance after the liner has been finished, not before. Binding after a reline nearly always comes from a gib that was set to the old geometry, or from a liner that was machined thicker at one end.
- Does a liner cure tailstock alignment problems?
- It can correct height, because liner thickness is a known quantity, but it does not correct a twisted bed. Align the tailstock against the spindle axis after the carriage work is finished and the machine has been levelled.
Get a quotation for this application
Send the machine type, the axis, the length of each slide and the thickness you need, and we quote the strip, the two-part epoxy adhesive and the spotting paste together.