Jet Tools 22-44 Plus owner manual Selecting Sandsmart Feed Rates, Selecting Drum Abrasives

Selecting SANDSMART™ Feed Rates

Begin experimenting with the feed rate set at about 40%-50% of maximum. The best feed rate will depend on a number of factors, including type of stock, grit and depth of cut used, and whether the stock is feed directly in- line with the conveyor bed or at an angle. If a “ripple effect” or inconsistent finish is observed, slow down the feed rate. If the finish is smooth and consistent and the sander is not overworking, experiment using a faster feed rate.

The SandSmart control (A, Fig. 15) continuously monitors the load on the drum motor, and automatically regulates the speed of the conveyor motor to maintain the highest feed rate without overload. If the load on the drum motor increases, the SandSmart control will decrease the conveyor feed rate and will stop the conveyor under extreme conditions. If the load on the drum decreases, the SandSmart control will increase the feed rate but will not increase it faster than the manual setting on the switch dial.

The best and most consistent finish will be achieved if the conveyor does not change speed during operation. When the “red” indicator light (B, Fig. 15) comes on, the SandSmart control has detected too great a depth of cut and/or too fast a feed rate. This change in conveyor speed may affect the finish surface. If the finish is affected, make another sanding pass without changing any settings. If the finish is still affected, make adjustments by slowing the conveyor and/or decreasing the depth of cut and run the stock through again.

Abrasives

The abrasive material you choose will have a substantial effect on the performance of your sander. Variations in paper type, weight, coating, and durability all contribute to achieving your desired finish. For the best sanding results, Performax offers premium abrasives that have been tested and certified for lowest overall cost

and maximum performance. Genuine Performax abrasives are available in pre-cut “Ready- to-Wrap” lengths or in the convenient pre-marked “Ready-to-Cut” box.

Selecting Drum Abrasives

It is important to select the proper grit of abrasives for the type of sanding being performed to achieve maximum sanding results. As with any sanding operation, first begin sanding with coarser grit, depending on the roughness of the stock, or the amount of stock

to be removed. Then progressively work toward finer grits. The chart below shows the general uses for the various grits. Performax offers strip rolls in the eight different abrasive grits shown.

Grit	Common Application
24 Grit	Abrasive planing, surfacing rough-
	sawn	boards,		maximum	stock
	removal, glue removal.
36 Grit	Abrasive		planing,	surfacing	rough
	sawn	boards,		maximum	stock
	removal, glue removal.
50 Grit	Surfacing		and dimensioning		boards,
60 Grit	truing warped boards
80 Grit	Surfacing,		light	dimensioning,
	removing planer ripples.
100 Grit	Light surfacing, removing light planer
	ripples.
120 Grit	Light surfacing, minimal stock removal.
150 Grit	Finish sanding, minimal stock removal.
180 Grit	Finish sanding only, not for stock
	removal.
220 Grit	Finish sanding only, not for stock
	removal.

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