This article is the fourth in the Snips series on hand brake troubleshooting that originally appeared in 1986. This article is from August 1986.
For the past three months, Vince Bellik has presented a series of articles on hand brake troubleshooting. The first series dealt with hand brakes that were made prior to 1965.
This month, Bellik comments on hand brake troubleshooting for those machines that were manufactured after 1965. These later machines have incorporated many advanced features, particularly those for making adjustments easier to accomplish.
Vince Bellik is one of the industry’s most knowledgeable individuals regarding taking proper care of this invaluable piece of sheet metal shop equipment. He has had many years of experience with Dreis & Krump Manufacturing. Co., and Pacific Press & Shear Co.
For this first article in his second series on hand brake troubleshooting, Bellik discusses: leveling, capacity and top adjustment, clamping for metal thickness.
Leveling the new hand brakeIt is mandatory to set the hand brake level, with the shipping skids removed, and bolt it to the floor before operating. If the brake is not level, the top leaf will creep and produce error in the parts being formed. To adjust:
1. Check to be sure all bolts and setscrews are tight.
2. Check to be sure that bed adjustment saddle and top adjustment screw collar are locked into position so that the adjustment screw cannot move back and forth in the saddle. The front shoulder of the screw and face of the collar must be snug -not tight - against the saddle. Be sure that setscrew in top adjustment nut is snug. Check both sides of the brake.
3. If top leaf still creeps, place a wedge under the rear leg at the creeping end until the creeping stops. Replace the wedge with permanent shims.
Capacity and top adjustmentBefore shipment from the factory, all brakes are adjusted to their maximum capacity. Therefore, it is necessary to readjust the brake when lighter gauge materials are to be formed.
Hand brake capacity is established with the bending leaf angle bar in the high position. This allows full rated 1-inch-minimum flange on capacity material (mild steel) with top leaf adjusted back from the bending edge twice the material thickness.
For adjustment of top leaf, release clamping handles slightly. By means of the top adjustment, turn star wheel forward or backward to obtain the desired setting.