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Factors affecting costs and efficiency

 

Diameter and length of logs to be milled.

Logs over three feet in diameter need to be reduced in size in some way so that the mill can deal with them. A big slab can be cut off one side, or they can be cleft up the middle with wedges or a chainsaw. What we do will depend on the species of timber is and what it is to be cut into.

Diameter:
Small diameter logs can be milled on the Wood-Mizer. We have cut a lot of smaller pieces for specific purposes. The smaller amount of timber  cut from each log has to be weighed against a slightly higher cost per cubic foot of useful timber produced.

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Length:
BDT can mill logs up to 40’ long (12 metres). The maximum size when mobile is 20’6” (6.3 metres), unless we bring the extension with us. For fast ‘production sawing’ long lengths are ideal, as the cost per unit of sawn timber produced is less. Conversely, a lot of short lengths reduce the cubic feet produced per day but still I am often amazed by the value in such boards once cut.


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Long before we had the bed extension, we squared up a 52 foot log of Douglas fir for Roving Commissions, which was to be shaped into a boat mast.

This was all done without the aid of a forklift (other than to raise the log onto our rudimentary support benches at the start).

After that, it was all levers, hammers and wedges.

Each move of the mill under the log took about 2 hours, with a cut or two taking 4 minutes after each move!

This large baulk was then ready to be shaped into a mast by the spar-maker.

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stacking sawn timber

Tree trunks or what we call logs can be moved around with winches, jacks and levers quite effectively, but the cost per unit of milled timber produced falls dramatically if a forklift, telehandler or forwarder is available to deliver timber to the mill and then to remove waste and sawn stuff.

Especially if it is cut into large pieces!

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Mechanical help:
The Wood-Mizer can pick up a log from the ground on its loading arms, so loading machinery is not essential, though it will save time and increase output per day if a loader or forklift  is available.

Not only for loading logs, but for removing cut stuff and shifting heavy stacks and waste material as well.

stacking timber

The cost of the milling can range from 1.50 per cubic foot of milled timber produced to 6 plus(where there is a lot of hand work involved, cleaving of large butts etc.) but even this higher cost may be insignificant when compared to the value of the sawn timber produced.

Please get in touch and we can give you an accurate idea of costs.

We will advise on the stacking and seasoning where required.

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The Wood-Mizer can work on a slope, but level ground makes the best sawmilling site.

If there is no mechanical help available, then the stacks of  butts will need to be organised to allow easy and safe access to each piece. This normally means arranging the logs “abreast” on bearers so that the sawmill can be set up alongside and each log can be rolled to the mill’s hydraulic loading arms.

Even very large pieces can be moved on bearers, where logs laid on the ground are much harder to shift about. Logs on bearers are cleaner, too, which means less time taken scraping mud or stones from them.

If we are lucky, sometimes a slope can be used to our advantage

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MOBILE SAWMILL - 2010 FULLY HYDRAULIC WOOD-MIZER - LOCALLY-GROWN TIMBER SUPPLIES (GREEN, AIR-DRIED AND KILNED TO ORDER), UP TO 40 FOOT LENGTHS - SHINGLES - CLADDING - RE-SAWING SERVICE - CUSTOM MILLING - ADVICE ON STACKING AND DRYING TIMBER

Black Dog Timber, The Cottage, Forteviot, Perth, PH2 9BT
Telephone: 01764 684008         Mobile: 07796 301920       Email:

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Royal Scottish Forestry Society

Confederation of Forest Industries
The Association of Scottish Hardwood Sawmillers

The Association of Scottish Hardwood Sawmillers

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