Jet JVM-836 Operating Instructions And Parts Manual

Also see for JVM-836: Operator's manual Operator's manual

Jet JVM-836 Operating Instructions And Parts Manual Manual pdf 13 page image

13Note: Due to variables in tool diameter, coatings,coolant, and materials, no specific spindle speed orfeed rate recommendations are provided. Usegeneral shop manuals that have data applicable tothe milling and drilling operations being performed;or contact the supplier of the tooling, coolant, andmaterial for specific recommendations.10.5 Draw bar operation; changingtoolingThe drawbar has 7/16”-20 right hand threads andshould be tightened with normal pressure using theprovided wrench. To remove a tool:1. Lock spindle by turning spindle brake (B,Figure 6) left or right.2. Use provided wrench to loosen draw bar twoor three turns (counterclockwise).3. If collet does not open immediately, tap the topof draw bar with a soft-faced hammer toloosen collet from taper.4. Remove tool from collet.5. Insert new tool into collet.6. Tighten draw bar firmly using provided wrench.The tool is now ready for use.7. Release spindle brake.11.0 Adjustments11.1 Head movement: left and rightMake sure machine base issecured to floor before repositioning mill head.The center of gravity can shift enough to causemachine to tip over, resulting in serious injuryto operator and damage to machine.1. Loosen four large hex nuts (A, Figure 11) thatsecure mill head to ram adapter. One-quarter(1/4) turn should be sufficient to allow head tomove.NOTE: For angles greater than 10 degrees,use your free hand to support mill head,relieving weight off the brass worm gears.Doing so will lengthen life of worm gears.2. Turn worm nut (B, Figure 11) to tilt head left orright as required. Use scale on ram adapter toestablish angle.NOTE: The scales on ram adapter and forhead rotation are guides only. Close tolerancework will require use of a dial indicator to makesure head is 90° to table in X and Y axes.Please note the table is fitted to be slightlyhigher in front, usually about 0.0005”.Be sure to apply torque intwo steps using a crossing pattern. Failureto do so could distort the face of the ramadapter.3. Tighten the four hex nuts. Tighten in two stepsusing a calibrated torque wrench. Use acrossing pattern to tighten the nuts. Tighteninitially to 25 foot-pounds.Figure 11: head movement4. Before applying final torque, check to makesure mill head is perpendicular to worktable.5. Set up a dial indicator in a collet (see Figure11) and secure using draw bar.6. Put spindle drive in neutral.7. Set the dial indicator plunger on the worktable.Zero indicator.8. Rotate spindle 180 degrees (when rotating,raise dial indicator plunger by hand to preventit from dropping into table T-slots).9. Read dial indicator – it should read zero. If not,loosen the four hex nuts and reposition millhead.10. Recheck perpendicularity using dial indicator.Repeat the above procedure until dial indicatorreads zero in both positions.11. Tighten the four hex nuts. Tighten in two stepsusing a calibrated torque wrench. Use acrossing pattern to tighten the nuts. Tighteninitially to 25 foot-pounds, then tighten to finaltorque of 50 foot-pounds. NOTE: Do notovertighten, as it may cause binding of quill.Be sure to apply torque intwo steps using a crossing pattern. Failureto do so could distort the face of the ramadapter.