Grind Wheel
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 2 Pcs 10cm Outside Dia 80 Grit Flap Sanding Disc Grinding Wheel  US $6.17
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 Glass Diamond Grinding Wheel Disc 4 Inches Sparking US $9.91
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 80 Grit 4 Outer Dia Grinding Wheel Flap Sanding Disc US $4.30
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 Angle Grinder Part 9 16 Thick Grinding Wheel Disc 4 220 Grit US $5.55
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 Metal Working 16mm Inner Dia Grinding Abrasives Cutting Wheel US $7.52
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 150mm x 10mm x 32mm x 8mm One Tapered Side Plain Diamond Grinding Wheel 180 Grit US $23.42
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 80 Grit 4 Outer Dia Grinding Wheel Flap Sanding Disc US $7.89
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 Black Metal Grinding Wheel Disc Abrasives Slice Cutting US $4.00
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 2 Pcs Metal Polishing 100mm Outside Dia Sisal Grinding Wheels US $6.27
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 CGW Grinding Wheel Green Silicon Carbide 6x1x1 single pack US $18.49
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 100mm Outer Dia 6mm Thick Grinding Wheel Polishing Disc US $5.79
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 Glass Diamond Grinding Wheel Disc 4 Inches Sparking US $5.71
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 Marble Stone 100mm 3 9 10 100 Grit Diamond Grinding Wheel Blade US $7.51
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 Resin Bond Plain Diamond Grinding Wheel Grinder 240 Grit 150x10x32x4mm US $36.66
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 Resin Bond Flaring Cup Diamond Grinding Wheel Grinder 180 Grit 125x32x32x10x3mm US $30.32
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 2 Pcs Metal Polishing 100mm Outside Dia Sisal Grinding Wheels US $5.83
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 10 4 GRINDING WHEELS FITS MAKITA ANGLE GRINDER US $4.99
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 150mm x 10mm x 32mm x 8mm One Tapered Side Plain Diamond Grinding Wheel 180 Grit US $23.43
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 Black Metal Grinding Wheel Disc Abrasives Slice Cutting US $3.77
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 10cm Dia Abrasive Reinforced Grinding Wheel Black Yellow US $5.03
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 8 BENCH GRINDER GRINDING STONE WIRE WHEEL LIGHT UL US $69.99
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 10 4 GRINDING WHEELS FITS MAKITA ANGLE GRINDER US $4.99
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 NEW BUFFALO ANGLE GRINDER 7 inch w Grinding Wheel HOT US $19.99
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 4 Outside Dia 220 Grit Whetstone Grinding Wheel 9 16 Thick US $6.03
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 FREE SHIPLOT OF 20 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $19.99
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 100mm Outside Dia 25mm Thick Grinding Wheel Polishing Discs 2 Pcs US $5.30
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 125mm x 32mm 75 180 Grit Resin Bonded Flaring Cup Diamond Grinding Wheel Tool US $28.97
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 Lawn Mower blades Grinder Sharpen Get this GRINDING WHEEL 5 X 3 X 125 US $13.00
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 Plastic Lid 4 Outside Dia Nylon Polishing Grinding Wheels 2 Pcs US $7.25
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 Grinding Wheel Head 5mm Metal Shank Mounted Point 5 Pcs US $7.98
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 DeWalt DW4719 High Performance Type 27 1 4 Metal Grinding Wheels 10 PACK US $19.99
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 DeWalt DW4719 High Performance Type 27 1 4 Metal Grinding Wheels 10 PACK US $19.99
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 2 Pcs 100mm Outside Dia Metal Polishing Discs Abrasives Grinding Wheels US $9.88
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 FREE SHIPLOT OF 50 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $48.95
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 FREE SHIPLOT OF 20 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $19.99
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 FREE SHIPLOT OF 50 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $48.95
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 150 x 32 x 32 x 10 x 3mm Bowl Shaped Flaring Cup Diamond Grinding Wheel 240 Grit US $36.25
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 150x10x32x8x1mm 180 Grit 75 Side Tapered Type Resin Bond Diamond Grinding Wheel US $22.53
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 FREE SHIPLOT OF 20 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $19.99
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 FREE SHIPLOT OF 50 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $48.95
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 FREE SHIPLOT OF 20 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $19.99
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 FREE SHIPLOT OF 50 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $48.95
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 FREE SHIPLOT OF 20 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $19.99
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 FREE SHIPLOT OF 50 4 1 2 GRINDING WHEEL DISCFREE SHIPPING US $48.95
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 Norton Grinding Wheels 7x1 2x1 1 4 Qty of 2 US $10.00
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 Drill Master 4 1 2 Angle Grinder with Grinding Wheel US $6.99
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 4 Outer Dia 80 Grit Flap Sanding Disc Grinding Wheel US $4.28
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 Grinding Wheel Head 5mm Metal Shank Mounted Point 5 Pcs US $8.56
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 NEW BUFFALO ANGLE GRINDER 7 inch w Grinding Wheel HOT US $19.99
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 2 Pcs 12mm Thick Abrasives Cutting Discs Grinding Wheels US $4.87
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 Plain Style 240 Grit 75 Resin Diamond Grinding Wheel 5 9 10 x 1 1 4 US $36.67
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 FIVE 7 DEPRESSED CENTER MASONRY GRINDING WHEELS US $12.99
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 Makita 9557PBX1 4 1 2 Angle Grinder w Case Diamond Blade and Grinding Wheels US $82.98
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 Abrasives 1mm Thickness Grind Disc Metal Cutting Wheel US $3.12
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 NEW BUFFALO ANGLE GRINDER 7 inch w Grinding Wheel HOT US $19.99
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 Angle Grinder Part 9 16 Thick Grinding Wheel Disc 4 220 Grit US $6.08
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 Slice Grinding Disc Cutting Wheel Blade Tool for Metal US $3.34
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 5 9 10 x 1 1 4 240 Grit Resin Bonded Flaring Cup Diamond Grinding Wheel Cutter US $37.89
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 Metal Polishing 100mm Outside Dia Sisal Grinding Wheel US $4.06
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 Steel Stone 5 Pcs Grinding Disc Abrasives Cutting Wheel US $5.52
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 Ivory Blue 06 Hole Diameter Wool Felt Grinding Abrasive Wheel Disc US $4.34
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 Lot of Five Grinding Wheels US $2.99
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 2 Pcs 10cm Outside Dia 80 Grit Flap Sanding Disc Grinding Wheel US $6.67
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 DeWalt DW4719 High Performance Type 27 1 4 Metal Grinding Wheels 10 PACK US $19.99
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 150x10x32x8x1mm 180 Grit 75 Side Tapered Type Resin Bond Diamond Grinding Wheel US $23.41
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 Marble Stone 100mm 3 9 10 100 Grit Diamond Grinding Wheel Blade US $7.98
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 10 4 1 2 GRINDING WHEELS FITS BOSCH ANGLE GRINDER US $5.99
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 05 Thread Dia Polishing Reinforced Grinding Wheel US $5.03
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 DeWalt DW4719 Type 27 7x1 4x7 8 Metal Grinding Wheels 10 PACK US $19.99
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 DeWalt DW4719 Type 27 7x1 4x7 8 Metal Grinding Wheels 10 PACK US $19.99
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 DeWalt DW4719 Type 27 7x1 4x7 8 Metal Grinding Wheels 10 PACK US $19.99
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 11mm Thick Nylon Buffing Wheel Grinding Disc for Metal US $4.17
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 NEW Straight Handle Wheel Grinding Dresser US $10.49
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 100mm x 16mm 100 Grit Diamond Coated Concave Grinding Wheel Disc US $7.98
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 DEWALT METAL GRINDING WHEELS TOTAL OF TEN WHEELS 5 EACH DW4522 DW4523 US $8.00
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What is linear speed of point on edge of .4 m diameter grinding wheel rotating at 1900 rpm?
Also, what is the acceleration of the point?
v = rω
v ≈ (0.2 m)(1,900 rev/min)(2π rad./rev.(1 min/60 s)
v ≈ 39.79351 m/s ≈ 39.8 m/s
If the angular velocity is constant,
a = rω^2 = (v^2)/r
a ≈ ((39.79351 m/s)^2)/(0.2 m)
a ≈ 7,917.616 m/s^2 ≈ 7,920 m/s^2
towards the center.
Analysis of Milling on a Grinding Machine
When the word "multitasking" is applied to machine tools, the term generally refers to a machine that is capable of both turning and milling. That definition is fine as far as it goes. However, turning and milling are two fairly similar operations. They both use a cutting edge to make a chip, and they both occur at roughly the same stage in a production process. If the argument for multitasking has to do with reducing both the delay and the potential for error that come from transporting parts between different machines, then that argument gains strength if the multitasking machine can combine operations that are even further removed from one another in the production process.
For example, what about combining milling and grinding?
Grinding, of course, is typically thought of as a finishing operation. Milling is more about removing a stock envelope. In many plants, these two operations are performed in different locations. In an even larger number of plants, they are performed by different employees who have different skills. Combining the two operations would not seem to be an obvious choice.
However, certain profile grinding machines have developed in the direction of this type of multitasking, even when combining operations was not necessarily the goal. The MFP-TC grinding machine pictured, from Magerle (represented in the United States by United Grinding Technologies, Miamisburg, Ohio), provides an example. To support an increasing role for creep-feed grinding (a higher-metal-removal rate process than grinding just for finish), this machine features a powerful spindle and stiff hydrostatic ways. Further, because wheel types such as conventional abrasive, plated CBN and vitrified CBN all excel in different applications, the machine has been equipped with the capability to store different wheels and automatically switch between them.
This latter feature relies on proven technology. Specifically, it relies on a toolchange arm like that of a machining center, along with toolholders (or wheelholders in this case) that use the HSK interface of a machining center's toolholders. Taken together, this machine's tool changing, spindle power and rigidity produce the equivalent of a highly capable machining center. Precise heavy milling can be performed on this machine, and milling and drilling tools can be stored in the tool magazine alongside the grinding wheels.
Minimal Milling
Chris Stine is a vice president of United Grinding Technologies. He says performing chip-making operations such as milling and drilling on a grinding machine is best suited to certain types of parts. It also requires a particular mindset about production.
For a part to benefit from milling or drilling on a grinder, the cycle should consist of mostly grinding. The MFP-TC machine cited above remains a grinder first and foremost, offering precision beyond what might be associated with even a higher-end machining center, he says. As a result, the machine can't compete economically against a machining center if traditional metalcutting makes up most of the work.
However, many ground parts do feature a small but critical amount of this metalcutting. Even on a grinding machine equipped with multiple wheels and capable of high metal removal rates, there are plenty of features that simply cannot be ground. Holes, pockets and slots that don't run completely through the workpiece are examples. When the part has one or more features such as these, performing these cuts on the grinder can save considerable cost by eliminating the need to set up on multiple machines. This is particularly true for parts such as airfoils, in which the location of machined features may be defined with respect to ground surfaces that have complex geometries.
Another argument for consolidating operations relates to the part's size. Large parts magnify the savings in floor space that might result from combining grinding and machining center operations into one machine. Labor savings might also be more significant. The bigger the part, the better it is to set it up in just one place.
For particularly large parts,such as jaw crusher,grinding mill,stone crusher,milling machine,rock crusher,crusher etc. Mr. Stine says that the range of potential operations expands to include turning. A rotary table that can turn at 70 rpm can deliver 1,500 sfm of cutting speed to a turning tool that cuts at a diameter of 7 feet. This is exactly the solution that GE Gas Turbines (Greenville, South Carolina) adopted for machining large turbine wheels. Parts that used to be machined on a grinder, a vertical lathe and a boring mill now receive all of this machining on one Magerle machine tool. The change saves about 6 hours of setup time and 2 days of queue time, according to engineers at the plant. Overall, there has been a 30 percent cycle time reduction.
Process Perspective
These savings overcome the fact that the multitasking grinder is unlikely to be cost-efficient when it comes to milling or turning as isolated operations. Accepting this seeming inefficiency within the machining cycle, for the sake of a more efficient process overall, is part of the recipe for implementing these machines effectively.
Different manufacturing organizations view their costs differently, and the need for this process-wide outlook is part of why identifying the right applications for these machines is not necessarily cut and dried.
A traditional manufacturing mindset looks at a part's features and tolerances to see the particular machine tools best suited to produce all of that geometry. This part-centered perspective may optimize machining time and machining cost, but it may do so at the expense of less easily quantifiable costs related to handling the part.
Mr. Stine says a different mindset focuses on a particular unit cost. The part has to be produced to meet a certain price, after all of the costs both on and off the machine tool have been factored in. In this view, the efficiency with which each feature is machined is less significant as long as the overall process is as efficient as it can be. This latter view, he says, is the one that is more likely to realize the value of consolidating the work of various diverse machine tools into one.
Turning On A Grinding Machine
"Hard turning" usually refers to the turning of workpieces that have Rockwell C hardness values in the range of 50 or 60. It typically involves a rigid lathe and a hard cutting tool material such as PCBN. The S242 machine from Studer (represented by United Grinding Technologies) is the latest machine from this company able to perform OD grinding and hard turning within a single cycle.
John Richard, senior sales manager for Studer, explains why the two processes are complementary. If the tolerance is tight enough, he says, then turning will not do. A turning insert's dimensions slowly change while the insert cuts, affecting machining accuracy and finish. A grinding wheel is continually reconditioned while it machines, but this is not the case with a turning insert.
On the other hand, the turning insert can deliver a performance advantage that a grinding wheel can't. If heat treating introduces variations in the geometry of a rotating part, then a grinding wheel is going to begin by finding the high spot of the workpiece every time. The grinding cycle will vary. By contrast, a turning insert can withstand a slightly varying depth of cut for the sake of beginning the machining at the same diameter every time, to make the machining time consistent from piece to piece.
About the Author
David ZHENG is the CEO of http://www.grinding-mill.com . A company specialized in selling all kinds of engineering machines such as jaw crusher,grinding mill,stone crusher,milling machine,rock crusher,crusher etc.
Alpha Ecogrinder with Segmented Grinding Cup Wheel
