J F Berns

The J.F. Berns Company manufactures high quality CNC Lathe and Bar Feeding accessories to increase your machining productivity. Products include spindle liners, bar chamfering machines, bar supports, spindle stops, draw tubes, draw bars, spindle extensions and special loaders and unloaders.

The J.F. Berns product is an excellent spindle liner product. We can run 48" bars in our 36" spindles at 3500-4500RPM smoothly. This is 1-2000RPM faster than Trusty Cook, allows cutoff tools to run at correct SFM to better life and with less noise to concern the operators, allows time savings in all programs, and often the liners can pay for themselves in the first job we use them on. We always kick ourselves when a job goes in and a JF liner isn't on the shelf to support that job, because their is no comparison.

Our liners are straightened to 0.005 TIR. A urethane liner's core straightness is determined by the straightness of the bar used to create the mold and the accuracy of the mold to hold the bar exactly on the centerline of the mold. You can verify the straightness of our liners, with a urethane liner there is no way to verify the concentricity of the OD and ID along the length of the tube.

Jack, All the products I have purchased from JF Berns have been the best. In my past, I bought quite a few of your Liners. Now that I have changed shops, there is a lot of growth potential for more Liner purchases.