15-4 PREFITTING AND MACHINING (PREMACHINING) DOORS
The doors may be machined at the factory to receive various types of hardware. Factory machining can prepare the door to receive cylindrical, tubular, mortise, unit, and rim locks. Other hardware such as finger pulls, door closers, flush catchers, and hinges (butts) are also provided for. Bevels are put on the doors, and any special requirements are handled.
Premachining is popular as it cuts job labor costs to a minimum, but coordination is important because the work is done at the factory from the hardware manufacturer’s templates. This means that approved shop drawings, hardware and door schedules, and the hardware manufacturer’s templates must be supplied to the door manufacturer.
From the estimator’s point of view, premachining takes an item that is difficult to estimate and simplifies it considerably. Except where skilled door hangers are available, premachined doors offer cost control with maximum results. For this reason, they are being used more and more frequently.
15-5 PREFINISHING DOORS
Prefinishing of doors is the process of applying the desired finish on the door at the factory instead of finishing the work on the job. Doors that are premachined are often prefinished as well. Various coatings are available including varnishes, lacquer, vinyl, and polyester films (for wood doors). Pigments and tints are sometimes added to achieve the desired visual effect. Metal doors may be prefinished with baked-on enamel or vinyl-clad finishes. Prefinishing can save considerable job-finishing time and generally yields a better result than job finishing. Doors that are prefinished should also be premachined so that they will mot have to be “worked on” on the job. The prefinished door must be handled carefully and installed at the end of the job so that the finish will not be damaged; it is often difficult to repair a damaged finish. Care during handling and storage is also requisite.
參考答案:15-4 PREFITTING和用机器制造的(PREMACHINING)门
门也许用机器制造在工厂接受硬件的各种各样的类型。 工厂用机器制造可能准备门接受圆柱形， 筒形， 榫眼， 单位， 并且外缘锁。 其他硬件例如手指拉扯， 闭门器， 充足的俘获器， 并且铰链(靶垛)也提供为。 斜面在门上把放， 并且所有特别要求被处理。
因为它减少工作人工成本到极小值， Premachining是普遍的， 因为工作被完成在工厂从硬件制造商的模板，但协调是重要的。 这意味着批准购物图画， 硬件和门日程表， 并且必须提供硬件制造商的模板给门制造商。
从估计物的观点， premachining采取是难估计的项目并且可观地简化它。 除了熟练的拉门吊挂装置是可利用的地方， premachined门提议成本控制以最大结果。 为此， 越来越频繁地使用他们。
15-5 PREFINISHING门
门Prefinishing是申请期望结束的过程在门在工厂而不是完成在工作的工作。 是的门premachined经常prefinished。 各种各样的涂层是可利用的包括油漆， 亮漆， 乙烯基， 并且聚酯薄膜(为木门)。
颜料和色彩有时增加达到期望视觉效果。 金属门也许是prefinished以烘烤在搪瓷或乙烯基穿的结束。 Prefinishing比工作精整可能节省可观的工作精整时间和一般产生一种更好的结果。 prefinished的门应该也是premachined，以便他们意志警句必须“工作在”在工作。 必须仔细地处理和安装prefinished门在工作的结尾，以便不会损坏结束; 修理损坏的结束经常是难的。 关心在处理和存贮期间也是必需品。
prefinishing and premachined
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