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A sander is a power tool used to smooth surfaces by abrasion with sandpaper. Sanders have a means to attach the sandpaper and a mechanism to move it rapidly contained within a housing with means to hand-hold it or fix it to a workbench. Woodworking sanders are usually powered electrically, and those used in auto-body repair work by compressed air.
Sanders and sanding machines are used to finish wood, plastic, or composites through the application of abrasive belts, discs, or sheets
WHAT IS A SANDING MACHINE USE FOR
The Sanding machine is used to smooth materials such as woods and plastics. It is also used to remove small amounts of waste material.
THINGS TO CONSIDER WHEN BUYING A SANDING MACHINE
- Machine selection
Sanding machines come in all sizes, shapes, configurations, and prices. Wading through the seemingly endless number of options is a daunting task – especially if you are in the market for a small to medium-duty machine. Every supplier/salesman/engineer will have their own opinion about the correct machine to meet your needs, and it usually will come down to Duty Cycle (Based on Hours/Day), Head Types (From Application Needs), Machine Width (Based on Part Size or Throughput), and Budget. You, the customer, has the difficult job of trying to compare apples to oranges between all the quotes/specs/info you have compiled to find the “best value” for your needs? Now, best value doesn’t mean the lowest cost machine, but the overall package (features/options/support/lead-time).
- Head types
At the most basic level there are only 4 head types in feed-through sanding machines: Knife/Planer, Wide Belt, Orbital, Brush. Knife planers are the most basic using a metal roller with specially designed knife edges to rapidly shave-off large pieces of material. This type of head is great at rapid stock removal but can leave an undesirable finish, so it is usually followed up by an abrasive belt head. Most abrasive belt heads use a rubber covered drum and/or a platen (segmented or fixed) to perform additional calibration/finishing steps to arrive at a final finish. The contact drum leaves a short deep scratch, while a platen leaves a long shallow scratch (and is often located in the last position). The straight scratch from a wide belt head can be hard to see when in-line with the grain, but when perpendicular to the grain can be unsightly. An orbital head can be used to remove this linear cross-grain scratches using a wide platen and special motion (like a handheld “jitterbug”). Lastly, a brush head can be used to break sharp edges and even out the part surface for consistency in stain colors.
- Abrasives
The common denominator in any sanding machine is the abrasive. The actual abrasive mineral is contacting the part and doing all the work that you see; the machine is just backing it up. One way to think of abrasives is to compare the application to tires on your car. Many car manufacturers recommend a specific tire to “guarantee” a vehicle’s performance. Replacing the stock tires with expensive racing slicks isn’t going to help in a blizzard but will outperform big mud tires at a race track, but if all you are doing is driving around town and commuting then you are wasting your money with either option.
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