File:Canadian forest industries January-June 1921 (1921) (20520229352).jpg

Title: Canadian forest industries January-June 1921
Identifier: canadianforjanjun1921donm (find matches)
Year: 1921 (1920s)
Authors:
Subjects: Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries
Publisher: Don Mills, Ont. : Southam Business Publications
Contributing Library: Fisher - University of Toronto
Digitizing Sponsor: University of Toronto

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April 1, 1921 CANADA LUMBERMAN 57
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Front View of the Big Johnson Stock Gang. This machine has a capacity of 100,000 feet per nine-hour day, and saws up the snaaller logs. The feed-in rolls are independently driven by a Dake engine controlled by the lever in the right hand of the operator. The logs are slabbed by a pair of twin circulars. friends of the pulp and paper industry and equip the "Canadian Lum- bermen's Association" with a "Technical Division" ; this in view of the necessity of creating- a new and more economical condition throughout the whole industry. It was in 1865 that a sawmill was built at .\rnprior and has ever since been in continuous operation in the hands of the McLachlin family. T-he_ founder of the business was Daniel McLachlin, who in his early days was engaged in the square timber trade, being one of the pioneers when hewn products j^layed such a leading part in the development of Canada. Daniel McLachlin passed away in 1872 and his sons, Hugh F. and Claude, then formed the firm of McLachlin Bros., who conducted the mill on broad, progressive lines. Claude McLachlin died in 1904 and two years later a joint stock company was formed under the name of Mcl.achlin Bros. Limited. The other member of the firm, Hugh F. McLachlin, joined the silent majority in 1912. It was then that Dan McLachlin, now president of the firm, took hold of the proposition and has built it up on constantly ex- panding lines. Dan McLachlin is an Arnprior boy, born and bred. Lie was educated there and later at Ottawa and Montreal. Mr. McLachlin is only forty years of age and today occupies the responsible position of president of the Canadian Lumbermen's Association, the highest office in the gift of the lumbermen of the Dominion, being unani- mously re-elected at the annual meeting held recentl)- in Ottawa. Mr. McLachlin has always taken a lively interest in municipal life and is a former mayor of Arnprior as well as vice-president of the Canadian Forestry Association and late president of the Quebec Limit Holders' Association. The normal capacity of the McLachHn mill is lietween 55,000,000 and 60,000,000 feet a year. It is equipped with four single cut band saws (two Stearns, one Hamilton and one WaterousV There is a lath and picket department. The cut is principally white pine, red pine and spruce. The company conduct from eight to twelve camps every season and employ between 750 and 1000 men in bush opera- tions. The camps are on the Petawawa, Black and Kipawa rivers. McLachlin Bros, have 14,000 square miles of timber limits in the province of Quebec and 220 square miles in Canada. Col. George H. Johnson, chief engineer of the firm, in speaking of their large new band resaw (Waterous-Johnson), in a recent in- terview, said: The new band resaw has proved entirely satisfactory and is, w c Ijclieve, a step in advance of present resaw design. The data and conditions that warranted the design of this machine were about .l.s follows:— _ J In our No. 3 Mill, with a capacity of approximately 300,000 feetl in ten hours, it was recognized that the slab coming from the dififcrent band mills, gangs and slabbers, was the biggest trouble maker in the whole plant. The new layout was designed to immediately remove all slabs from the sawing floor, leaving the mill proper and the men thereon entirely free to manufacture lumber without being annoyed ))y the ever present slab. All slabs were therefore dropped behind the head saws and carried sideways of the mill to a separate resawing machine designed svifficiently rugged to take care of all the slabs coming from a plant cutting about 300,000 feet per day. This machine would also be asked on occasion to take care of small 6" logs which would be split in halves on the main band saws. The same machine would also be required to split and resaw lumber coming back from the butters and yard to be regraded and remanu- factured. We therefore required a slab resaw, a cant re.saw, and a resaw splitter all combined in one machine. The machine would also require to be capable of an instantaneous change of size. The set works attachment would therefore require to be sufificiently quick and accurate to change instantly from on, wp to 4" or down as the occasion demanded. The following conditions were therefore laid down as necessary to be incorporated in the new machine: The cutting capacity of the saw blade would require to be suf- ficiently great so that it would be possible to feed slabs into the machine as rapidly as the saw could take care of them. This con- dition was met by a 12" saw blade running 10,000 feet per minute. The press roll arrangement and the swinging arm and parallel roller operated by air cylinders has proved to be ideal, as it has met every condition easily. It was decided that no shafting, gears or mechanism be incorporated in the design of the machine under the bed plate; all mechanism to be kept above the machine where it would be open to inspection and lubrication at all times. All gears were required to be of cut steel enclosed and running in grease. All bearings and thrust collars to be of the finest babbitt, incorporating the Randall Graphite Sheet Lubricator in all babbitted bearings. No variable friction feed gear would be required as the capacity of the saw was sufificiently ample to take care of even the largest of cuts at the highest speed. The feed gear to be stopped instantly by an air cylinder operated tightener pulley, on the 10" feed belt. The elevating- gear for saw changing to be operated by a Dake reversible air engine. The saw guides are also air operated, the control of the pressure on the press rolls to be susceptible of instant change. This was

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