Bandsaw lower wheel bearing replacement procedure
Since the bearings are bad, you don\'t care about hurting them worse; your three priorities are (1) getting the bearings OUT, (2) not damaging the wheel, and (3) not hurting yourself in the process.
The single best way I know to accomplish what you\'re setting out to accomplish is to use a small slide hammer with two fingers barely small enough to fit through the bearing\'s center hole. They\'ll hook on the insides of the inner bearing race. As you tap on the hammer end of the tool, it\'ll tug the bearing right out.
The second best way I know to do it is to use a long pin punch - about a 1/4" should be fine for it - and about a 120z hammer. You reach through one bearing to tap (GENTLY) on the inner race of the opposite bearing. Work ALL THE WAY AROUND so you don\'t accidentally cock the bearing in its bore as you drive it out. If you can detect that it\'s cocked a little, drive a little more on the diagonally opposite side until it straightens. If you cock the bearing in its bore, your wheel will be wrecked.
As an alternative to the pin punch, you can also drive out a bearing by using a concrete nail (available at your hardware store) turned around backwards. Concrete nails are stiffer, tougher, and harder than ordinary lumber nails. You\'d reach through one bearing\'s inner race with the HEAD of the concrete nail and tap on the nail\'s pointed TIP with your hammer. The nail\'s head will give you a straighter driving angle than the pin punch will. Still, use exactly the same procedure - tap gently and work all the way around.
Once you get one bearing out - either way, slide hammer or pin punch, you can easily drive the other bearing out. For that, you\'d use a deep socket barely small enough to fit through the hole in the wheel, plenty big enough to catch as much of the bearing\'s outer race as possible. Again, tap GENTLY on the opposite end of the socket with your hammer, and watch carefully - if that bearing cocks a little, you have to concentrate on driving the diametrically opposite side a little more so the bearing drives straight out.
If this wasn\'t for a bandsaw, I\'d recommend heating the wheel\'s hub (BUT NOT the bearing!) with a propane torch to expand the aluminum hub a little - the bearing would nearly fall out - but this IS for a bandsaw, and of all things you don\'t want the heat to to distort that wheel. Careless torch work can even melt the wheel, and it\'d certainly ruin your tire. The carpet, too. :) :) :)
No, leave the torch alone, don\'t use it here. If you\'d like to own a slide hammer, find a SMALL one & buy one. If you\'d have no later uses for a slide hammer, try working with either a concrete nail or a pin punch.
Mar 14, 2014 |
Craftsman 12 Tilt Head Band Saw Owner...