Now more than ever, those in the highly competitive lumber industry are seeking every advantage to maximize their investments in both timber and equipment...
Now more than ever, those in the highly competitive lumber industry are seeking every advantage to maximize their investments in both timber and equipment.
Most sawmills use the highest degree of accuracy when initially installing headrig carriage rails. However, over time the carriage rails become worn and/or misaligned. We consistently find V-rail misalignment up to .001 and flat rail wear in front of the slabber of .250+.
The most common problem with carriage rails is flat rail wear in front of the saw, causing the carriage to roll sideways in the cut. This is evidenced by the backstand boards being thin in the middle and on-size at the ends. It also causes undo stress on the saws, requiring more frequent sharpening and benching. Any V-rail misalignment only adds to the problem.
If your flat rail is worn ¼ inch in front of the saw, depending on the width of the rails, the top of the log is moving approximately the same amount.
A fast way of checking the carriage is to place a level on one of the bunks and watch the changes as the carriage moves down the track. The level should not change more than 0.010”/ft, otherwise the carriage will roll sideways, resulting in twisted and beveled backstand boards. Actually, most of the sideways movement of the knees is from the sideways rolling of the carriage due to wear of the flat rail, not distortion of the V-rail.
We recommend reading articles written by Bruce Lehmann, Senior Engineer at Thin Kerf Technologies, found at www.thinkerf.com
In the past, the solution to worn rails and the resulting sawing problems was to replace the rails with new ones. Not only is this very costly in terms of the expense of the new rails and labor involved, but also the considerable loss of production time. We offer a service that lends assistance in both areas. Ninety percent of the rails we check can be brought back to initial trueness using the process of in-place carriage rail restoration with no loss of production time. This is a proven process and is done at a fraction of the cost of rail replacement with equal or greater results.
In-place carriage rail restoration is the logical solution.
"I have used Acculine Rails for thirteen-plus years and have recommended them to anyone and everyone that has asked. In addition to grinding worn rails I have had them come in periodically and tune the tracks up by shimming and adjusting to avoid having to grind them. I can’t stress enough how much I appreciate their service. We have two six foot doublecut carriages cutting at a very high speed so we demand accurate rails and Acculine comes through every time."
- Mike West, Cascade Hardwood
"The Acculine process of professional, precision alignment and rail grinding has added value to our business. Cost savings from improved saw performance and lumber quality are a benefit from having our head rig and Maxi Mill rails ground by Acculine. Rail restoration worked for us."
- Jack Harrelson, Barge Forest Products
"Properly benched and sharpened saws are only 50% of the answer. Alignment and a plumb level track is a must. Good service, on time, job well done."