Using Power Sanders, Grinders Etc

Sanders are of several types: belt, drum, orbital, finishing or disc sanders. Disc sanders are the most usual and have a rubber or flexible backing pad.

All types of these work by means of discs or belts of abrasive papers either revolving or vibrating over a surface. Abrasive papers are removable and replaceable.

The ordinary disc sander has limitations as it tends to leave swirl marks. If you are seeking finer work, it is best to use a backing bed with a~ knuckle joint which ensures that the pressure on the work is always even, reducing swirl marks, or the type which has a. foam-rubber flexible backing.

The orbital sander consists of a vibratory attachment, or a purpose-made integrated unit capable of better work. These have a large surface pad to which an abrasive sheet can be attached.

This pad moves up and-down and in small circles to impart a smoothing action to the surface.

A drum sander consists of a revolving drum of stiff foam rubber with an abrasive strip fixed around its edge.

Belt sanders consist, as the name suggests, of a continuous belt of abrasive material, enabling bigger jobs to be tackled and better results to be achieved.

Dependent on type, belts, discs and drum sanders are either tightened up on the power tool by means of screw and clamp washers or are stuck on to the abrading surfaces with a special glue or adhesive tape.

Discs, belts and sheets are made in coarse, medium and fine grades, in glass-paper or carborundum. The latter costs more but has an extended life. In addition, there are wet-and-dry and preparation papers for rubbing down paintwork.

The disc can also be used in conjunction with a lambswool pad for polishing purposes.

Bench sanders consist of a disc which is covered with an abrasive paper. It works in conjunction with a horizontal table and guide fences. The sander enables ends of timber to be sanded accurately. The guide fence can be set at 45° or 90° angles for mitreing.

A bench sander can be duplicated by a power drill, sanding-plate attachment, and a horizontal sanding stand.

Bench grinder

This enables blunted tools to be ground and honed. The best units provide a shaft on each end, with a coarse stone, for grinding, and a fine one, for honing.

Stands

Another useful attachment is the horizontal bench stand. This enables the drill to be locked into a position on a bench, and is ideal for jobs, such as sanding, polishing and grinding or wire brushing, using the appropriate attachments.

The bench stand can also be part of a lathe unit, which enables a wide range of wood-turning work to be produced. This is useful, not only as a hobby, but also for making mouldings to replace damaged ones not readily available commercially.

A drill stand permits highly accurate bench work. It can be adjusted for height and radial swing. The drill simply latches into a collar and is clamped firmly into place by a back screw. For repetition work, the drill stand enables accurate and quick location for each hole.

Attachments

Bench attachments should be screwed firmly to a stout bench, so that they do not vibrate or move during use.

The only other items of equipment you may need are a selection of ‘G’ cramps to hold, in some circumstances, the work.

10. November 2011 by admin
Categories: Featured, Handyman Tips | Tags: , , , , , , , , , | Comments Off on Using Power Sanders, Grinders Etc

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