The Technique of FURNITURE MAKING

HORIZONTAL BORER

The mortise and tenon joint will always be preferable in quality work to dowelling, but where economy of time is vital, the horizontal borer is an obvious alternative to the mortiser. It usually has two drilling heads side by side and an adjustable table for height.

Figure 112 shows a home-made dowel borer. This was assembled out of engineering scrap with a 1/2. hp (0.373 kW) motor, screw-actuated elevating, and dovetail slide horizontal movement for the working-table taken from an

old milling-machine bought in the local scrap­yard. A 1/4 in (6 mm) sliding rod under the table provided an effective distance-stop, and the 1/2in (12.5 mm) capacity Jacob's chuck was mounted direct onto the motor spindle. With the table set at the right height and pushed forward by the pre-set distance against the revolving bit it gave very accurate borings, and such machines, either independent or as acces­sories coupled to other machines, are invaluable for accurate dowel-work. Minimum safe working distances between machines are shown in Figure 122 and where space is limited the in' or out' feed distance can often be increased by placing the machine in line with a doorway.

HORIZONTAL BORER

112 Dowel-boring machine

Both the mortiser and the horizontal borers have the advantage of operating at very slow speeds and quietly, in contrast to the overhead and portable routers which can be used in some shallow mortising operations.

HORIZONTAL BORER

113 High-speed router

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The Technique of FURNITURE MAKING

ESTIMATING THE COST OF MAN-HOURS IN HANDWORK

Where no previous records are available the proprietor must assess his own capabilities and those of his employees. Common joinery items are usually in softwood of fairly large dimensions, with …

Costs of man-hours

The total cost of man-hours at the rates paid, plus overtime rates where applicable, plus health insurance, pensions, paid holidays, etc. have to be considered. Here again these may be …

Appendix: Costing and estimating

Costing is the pricing of completed work taking into account not only all the direct expenses— materials, wages and insurances, fuel and power, machining costs, workshop expenses, etc.—but also a …

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