Jet HVBS-710S Operating Instructions And Parts Manual

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193. When the saw has completed 1/3 of the cut,increase the feed rate slightly and allow thesaw to complete the cut.4. Keep the same hydraulic cylinder setting andbegin a second cut on the same or similarworkpiece.5. When the blade has completed about 1/3 ofthe cut, increase feed rate. Watch the chipformation until cutting is at its most efficientrate and allow the saw to complete the cut(see section 11.4, Evaluating cuttingefficiency).6. The blade is now ready for regular service.11.3 General operating procedure1. Raise bow until it will clear workpiece by a fewinches, and close hydraulic cylinder valve tosecure it in place.NOTE: Never start a cut with bladecontacting workpiece.2. Place workpiece in vise and tighten vise. Theworkpiece should be fitted directly between thejaws without adding other objects.When workpiece to be cut is a profiled section,flat piece or special shape, refer to examplesin Figure 30 for proper clamping positions. Thetop row shows acceptable clamping positions;the bottom row shows unacceptable positions.If thickness of profiled section is very thin, apiece which duplicates the profile should befitted inside the workpiece itself, to preventworkpiece being crushed between the jaws.Figure 30Never hold a workpiece byhand when cutting it – the workpiece should befirmly secured in the vise. Do not reach into thecutting area during cutting operations.3. Position work stop if needed.4. Position blade guides as close to workpiece aspossible.5. Move speed setting handle to desired position.Do not move speed setting handle during acutting operation.6. Set a suitable downfeed rate for that operationon the hydraulic cylinder dial.7. Push start button to begin blade rotation. Allowblade to reach full speed before beginning cut.8. Turn on coolant flow. Adjust flow valves asneeded.9. Open valve on hydraulic cylinder to allow bowto descend in a gradual and controlledmanner.10. The machine will shut off at the completion ofthe cut. Turn off coolant flow and removeworkpiece.11. Return bow to raised position for next cut.11.4 Evaluating cutting efficiencyIs the blade cutting efficiently? The best way todetermine this is to observe the chips formed bythe cutting blade.If chip formation is powdery, then the feed rate ismuch too light, or the blade is dull.If chips formed are curled, but colored — that is,either blue or straw-colored from heat generatedduring the cut — then the feed rate is too high.If chips are slightly curled and are not colored byheat – the blade is sufficiently sharp and is cuttingat its most efficient rate.12.0 MaintenanceBefore doing maintenance onthe machine, disconnect it from the electricalsupply by pulling out the plug or switching offthe main switch! Failure to comply may causeserious injury.Keep all surfaces clean and free of rust, slag,chips, and coolant build-up.Clear metal particles with a small paint brush orparts cleaning brush.Clean filter screen.Do not use compressed air, as it may force chipsinto the guide bearings and other critical areas ofthe saw.Wipe saw down with a clean, dry cloth, and oil allunpainted surfaces with light machine oil.Keep blade guides clean and free of metalparticles.Check guide bearings frequently to make sure thatthey are properly adjusted and turning freely.If the power cord is worn, cut, or damaged in anyway, have it replaced immediately.Ball bearings on blade guide assemblies and bladewheels are permanently lubricated and sealed.They require no further lubrication.Grease the vise lead screw (Figure 31) as needed,with a general purpose grease.