PROBLEM: Does Thomson provide profile rail longer than the standard length?
SOLUTION: Yes, and for rails longer than the longest length available in one piece, a butt joint is required.
A butt joint is formed by butting the end of two matched rails together. The ends of rails that are to be butt jointed are specially machined at the factory and marked with same letter, and must be assembled in the same order. Due to the need to have a special ground joint the rails by the factory longer length must be ordered as a set. Rails butted together without the special joint will not provide a smooth transition for the carriage from one rail to the other. This could damage the bearings and result in premature wear.
Thomson 500 Series Profile Rail (both ball and roller type) come in standard 6m lengths, minimizing the need for butt joints.
We strongly recommend the use of a locating edge when using butt jointed rails. This ensures proper alignment of the raceways across the joint.