Two cuts are bet­ter than one

New Zealand Logger - - Woodtech 2017 -

A NEW TYPE OF BREAK­DOWN SAW HAS BEEN DE­VEL­OPED BY HewSaw of Fin­land that it says will “rev­o­lu­tionise” the saw milling in­dus­try.

It’s called the DX Saw­ing method and it utilises two saws; one to make an ini­tial cut and the sec­ond to com­plete the full saw­ing of the log.

The idea be­hind it is that the first cut, or groove, acts as a guide and when the sec­ond blade fol­lows up with the fi­nal cut it makes a bet­ter job and is much faster than con­ven­tional saw­ing tech­niques.

Sami Helmi­nen, HewSaw’s Sales Man­ager for Aus­tralia and New Zealand, told the WoodTECH 21017 con­fer­ence in Ro­torua last month that his com­pany has been think­ing about this new process since the 1990s.

The ba­sic prin­ci­ple be­hind DX Saw­ing is to re­place the stan­dard dou­ble ar­bour saw­ing tech­nique used by HewSaw with a four ar­bour sys­tem. The first set of ar­bours will house the saw that make the ini­tial or pi­lot cut into the cant, while the sec­ond set of ar­bours fin­ish the cut. This twin-saw­ing process is also com­bined with the edg­ing of the side boards to make the process even faster.

Why make the same cut twice? There are sev­eral rea­sons, but it’s mostly about in­creas­ing the saw line speed and be­ing more ac­cu­rate, with less wastage.

Be­cause nei­ther of the two saws in the DX sys­tem are cut­ting all the way through the cant, the depth of cut is sub­stan­tially re­duced, which means saw mills can run at higher speeds (up to 30% faster) with smaller di­am­e­ter saws and thin­ner kerfs (up to 12% less) – ideal for mills pro­cess­ing larger logs. HewSaw says the DX Saw­ing sys­tem can de­liver a va­ri­ety of ben­e­fits to suit in­di­vid­ual mills, in­clud­ing: • More pro­duc­tion vol­ume per shift

• Same pro­duc­tion vol­ume, but with shorter shifts

• Higher re­cover or yield from each log

• Im­proved sur­face qual­ity and ex­cep­tional saw de­vi­a­tion

• As each saw makes smaller cuts, there is an op­por­tu­nity to run the line for longer pe­ri­ods be­tween saw changes.

Mr Helmi­nen ex­plains that the first saw is thin­ner and “calms” the sec­ond cut, re­sult­ing in no vi­bra­tion or de­vi­a­tion.

HewSaw says the DX Saw­ing sys­tem can be in­te­grated into ex­ist­ing lines, as well as be­ing part of a newly es­tab­lished mill. It has al­ready been tested in saw mills in Fin­land and the USA, and Mr Helmi­nen de­scribes the re­sults as “ex­cep­tional”.

It is now be­ing of­fered to cus­tomers world­wide and the com­pany says it will be a “game-changer” for saw mills.

NZL

The new DX Saw­ing sys­tem from HewSaw speeds up pro­duc­tion by us­ing two saws in­stead of one.

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