고정 헤더 영역
상세 컨텐츠
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How to Use a Surface Grinder Machine:Asurface grinding machine is used to produce a smooth accurate finish oneither metallic or nonmetallic materials. It uses a round rotating abrasivegrinding wheel that remains stationary (but rotating) while the feed table(with work attached) is run in a reciprocating motion (left and right)under the grinding wheel. The specific amount of material to remove isdetermined by lightly touching off on the work with the grinding wheelrotating and feeding the grinding head down a certain distance. W AR N I N G - If a grinding wheel is permitted to exceed the maximum safespeed, it may disintegrate and cause injury to the operator and damageto the grinding machine!On aManual Surface Grinder, you will then need to run the table left andright with one hand wheel while cross-feeding with the other handwheel.On anAutomatic Surface Grinder, you will then be able to run the tableleft and right automatically while cross-feeding automatically. Allyou need to do is set the down feed and stroke.Typicallysurface grinders can grind within.0001 -.0002 but not all surface grindersare created equal. The less expensive models may not hold up to tool roomaccuracies but could be used effectively to sharpen punches, dies or dorepair shop work.
Nist Handbook 44 Tolerances
The more expensive models will use higher quality spindlebearings and other components and will be better able to attain tool roomaccuracies.Touse the surface grinder, you must select the correct grinding wheel forthe work to be ground. There are different wheels that are best suitedfor grinding:.High Speed Steel RC 50-68. 400 Series Stainless. Soft Steels RC 30-45.
300 Series Stainless. Cast Iron: Ductile & Gray.
Nonferrous AlloysIneach of the categories above you will need to determine wheel type bydeciding if you need heavy (.004), moderate (.002.004) or light stock(.001) removal characteristics. Also, you will need to select a Grit size.46 grit being for general purpose, 60 grit for commercial finish, 80 gritfor fine finish and 120 grit for very fine finishes.Afterselecting the correct wheel for your job, visually inspect the wheel forany damage or cracks. If no damage is found install the wheel on yoursurface grinder, tightening the left-hand spindle nut carefully with aspanner wrench.
Make sure you replace the guard covering the wheel, putsafety glasses on then turn the spindle on. Step away and let the spindlerun for 1 minute to make sure the grinding wheel is running smoothly.Oncethe grinding wheel has been dressed it is not recommended to turn thespindle off because turning off the spindle will require the wheel tobe dressed again for some concentricity will be lost.Youare now ready to dress the wheel using a single point diamond dressingtool that is placed and held down by the magnetic chuck.
A small amountof grinding wheel should be dressed off of the diameter in order to makethe wheel run concentric. Place the diamond dresser under the rotatingwheel and bring down the grinding head carefully so it just touches thedresser. Sweep the diamond dresser across the rotating wheel using thecross feed (y-axis). Feed the grinding head down.002 then sweep the diamonddresser across the rotating wheel. Repeat until the grinding wheel faceis clean and running concentric.Afterthe wheel is dressed and running concentric you will then be ready togently touch off on the work (using the spark or layout fluid method).Next, set your 'zero' on the down feed handle, raise the head slightlyto clear work then the cross feed handle to distance the work from thegrinding wheel. Next feed the grinding head down a distance not more then.005.
Handbook 44 Scales
The amount of material being removed will determine how far youcan feed the cross-feed in per pass.Thebenefits of surface grinding are: You can grind very hard or abrasive materials High degree of dimensional accuracy Produces surface textures of very high finish Tooling is less expensive Work holding is easier because of magnetic chuck Can be done automaticallyInshort, you will most likely need a surface grinder if you need to provideprecision ground surfaces, either for a high surface finish or attainingcritical dimensions.GRINDINGMACHINES(originally written by the U.S. Army)Grindingis the process of removing metal by the application of abrasives whichare bonded to form a rotating wheel. When the moving abrasive particlescontact the workpiece, they act as tiny cutting tools, each particle cuttinga tiny chip from the workpiece. It is a common error to believe that grindingabrasive wheels remove material by a rubbing action; actually, the processis as much a cutting action as drilling, milling, and lathe turning.
