Jet SBR-30N Operating Instructions And Parts Manual

Also see for EQUIPMENT &TOOLS SBR-30N: Owner's manual

10TIP: If it doesn’t interfere with the proposed finalshape or design, a slight bend made with thepress brake on the leading edge will simplify theinitial rolling process, by allowing the leadingedge to slip more easily over the idle roll.Beware of the pinch point –the intersection of the upper and lower rolls.Failure to comply may cause serious injuryto fingers and/or hands.1. Make sure rolls and workpiece are cleanand free of debris to prevent pitting thesheet metal.2. Back off the idle roll completely by rotatingthe idle roll screws (L, Figure 12) counter-clockwise.3. Loosen the bolt (M, Figure 12) to increasethe space between upper and lower pressrolls.4. Insert the material between the upper andlower rolls, and tighten the bolt (M, Figure12) to lower the upper roll, until the materialfits snugly. The upper roll must havesufficient pressure on the work piece to feedproperly.5. Rotate both idle roll screws (L, Figure 12) toadjust the idle roll’s proximity to the twomain rollers. Raise both ends an equalamount.6. Run the workpiece through the machineusing the operating lever. If the workpiece islarge, make sure it receives proper supportas it exits the slip roll machine.7. Make further passes of the workpiece,raising the idle roll incrementally beforeeach pass, until the desired radius isachieved.No exact formula can be followed when makingroll adjustments because material “spring-back”varies with the kind of material being formed.Only by test forming several pieces can thecorrect adjustments be obtained. Also, keep inmind that it is much easier to re-pass material tomake a smaller radius than to attempt toincrease a radius that was made too small.The idle roll must be adjusted exactly parallel orthe material will spiral during the rolling process.Measure each end of the opening with calipers ifgreater precision is required.Deliberately setting the rolls non-parallel can beused to make cone shapes.Figure 12