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Wood-Mizer reports about the improvements in the design of its HR500 Horizontal Multi-head Resaw

Wood-Mizer reports about the improvements in the design of its HR500 Horizontal Multi-head Resaw
Since 2007, when the multi-head HR500 first appeared on the market, this capable and affordable resaw has proved its efficiency and cost recovery in many wood processing businesses.

The HR500 can be customized from just one to up to six cutting heads, each equipped with 11kW electric motors. The powered conveyor moves the cant through the sawheads, and has an adjustable speed of up to 20m/min. Every cutting head is set at a different height increment from the conveyor, making it simple to convert a cant into several boards of preset thickness in one pass. In addition, the heads tilt up to 8 degrees, capable of producing tapered siding products.

These features allow the HR500 to produce not only pallet boards – its most popular use – but siding, flooring with the minimum thickness of 4 mm, fencing, furniture components, and wooden tiles.

Improvements to the HR500
Wood-Mizer has acted on customer feedback and their own testing, and the Research and Development Department has found solutions to improve functionality, cut quality, maintenance access, and safety.

As a result, the following improvements were introduced into the HR500 design:

1) Reinforced material clamping system - important for cut precision. Standard, each HR500 head has a single top roller of 200mm or 300mm diameter, which works well for most cutting applications. But for sawing short cants or material that is curved and has a lot of internal tension, Wood-Mizer recommends a now available option with two rollers for each head, one before and one after the sawblade.

2) New standard blade lubrication valve system. Rather than each sawhead having its own lubrication container, each head is now linked to a central lubrication supply, and the manual valves have been replaced with an automatic system that opens when the heads are running and shuts off when they stop.

3) The most significant modification is the redesign of the blade tensioning system where all blades are tensioned at once from the operator’s station. The tension level remains the same for all blades during sawing.

Economical benefits
The main advantage of the HR500 multi-head is the opportunity to dramatically increase productivity and reduce labor costs since several boards can be made from a cant in a single pass. When the HR500 is integrated with Wood-Mizer’s small log processing line, the log is fed into the resaw automatically by the conveyor and only one worker is needed to remove the finished lumber.

Unlike bulkier machines, the HR500 doesn’t require a thick foundation before installation. And the use of narrow blades provides multiple benefits: blades are inexpensive, easy to sharpen, and due to their thin-kerf cut, this resaw produces more boards and less sawdust from every log. With the HR500 technology, wood processing enterprises can become even more competitive due to the quality of their products and increase in production.

The renewed HR500 horizontal resaw will be demonstrated at Ligna Messe in Hannover, May 6-10, 2013 where it will be installed in the small log processing line – a completely new line with automatic material flow that helps to reduce the total manpower. This SLP line requires only 2 – 3 workers depending on cutting pattern and material length.

Wood-Mizer sawmills and blades will be shown at the Ligna Messe open area near Hall 27.

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