Question 1

Sander keeps slipping. The sandpaper won't bit onto the wheel, wheel spins, sandpaper doesn't move. Just started happening recently.

Accepted Answer

Two possibilities come to mind. 1. The lock on the side is no longer closing as tight as it should. I have found that sometimes when I close that lever, it doesn't go as far as it should. I have to push it in a bit further to seat it. 2. Try seating the sandpaper in as far as it will go laterally, lock the lever and try adjusting the tracking wheel back and forth. 3. Check the foot and see if it is smooth-nothing for the belt to catch on. Also check behind the drive wheel for anything clogging the exhaust port and catching the belt. If it's anything else, such as either of the wheels being worn, you will probably have to replace the sander--it ain't worth fixin'. Another thing  it could be is that the belt is sized incorrectly. Double check your belts and verify that they are 3x21. Hope this helps.

Question 2

Is this tool variable speed?

Accepted Answer

Don't need variable speed - it's a power sander.  Sounds like you want a hand sanding block so you can limit possible damage to your delicate work piece.

Question 3

What grit should I use to sand glue from under a floor tile in the bathrooms to make it smooth?

Accepted Answer

BEWARE !   Asbestos was used in flooring and adhesives up until the 1980's   You don't want to sand it if there is any  chance there is asbestos in it.   Another option that sometimes works is to get a bunch of kettles of water boiling,  and keep wetting it with boiling water, while simultaneously heating it with a heat gun.  Best to have a helper, so its easier to keep all of it both hot and wet.   Scrape it with a good flooring scraper.   Start in one spot,  and work your way out from it.   This method doesn't work with every floor,  you'll know within 20 minutes or so whether it will work for you.    To avoid asbestos dust the pros generally use floor leveler or emossing leveler instead of sanding.

Question 4

Does it have a variable speed feature?

Accepted Answer

No, there is no variable speed. Slow & steady.

ASIN	B0002ZU73I
Amperage Capacity	7 Amps
Best Sellers Rank	#171,414 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #60 in Power Belt Sanders
Brand Name	BLACK+DECKER
Customer Reviews	4.3 4.3 out of 5 stars (2,456)
Global Trade Identification Number	00028877479453
Grit Type	Medium
Included Components	(1) DS321 Sander \| Medium grit sanding belt \| Dust Bag
Item Dimensions L x W x H	15.25"L x 6.32"W x 6.32"H
Item Type Name	DRAGSTER WITH UPGRADE TO 7 AMPS
Item Weight	7 Pounds
Manufacturer	Black & Decker
Manufacturer Part Number	DS321
Manufacturer Warranty Description	2 Year Limited Warranty
Model Number	DS321
Power Source	Corded Electric
Shape	Rectangular
UPC	028877479453
Unit Count	1.0 Count
Voltage	120 Volts

BLACK+DECKER Belt Sander with Dust Bag, 7-Amp, 3-Inch by 21-Inch (DS321)

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