Image Credit: R. S. Hughes Company, Inc.   Grinders and grinding machines use an abrasive that is bonded to a wheel, belt or disc to remove material and improve surface finish. Devices can be pneumatically driven or powered by a combustion engine or electric motor.   Grinders and grinding machines can use single-phase or three-phase power and are available in a range of voltages. 60 Hz power is used in North America. 50 Hz power is used internationally.   Some...
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Q & A on Grinders and Grinding Machines

We asked our users for their input on Grinders and Grinding Machines. Here are the results of 162 users familiar with Grinders and Grinding Machines.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing grinder and grinding machine design?
21 answers
Answers:
Fastest moving technology is undoubtedly grinding wheel technology. Superabrasives have led to markedly shorter cutting times, meaning that sometimes loading and unloading the workpiece takes longer than the grind cycle. Superabrasives make demands on machine stiffness, thermal stability and guarding (safety and retention of the high-pressure coolant system required), and may require advanced dressing technology.
~Engineering, Design, Colchester, Great Britain
1 ) CN driving 2 ) High speed grinding technology ( over 63 m/sec ) 3 ) in-process dressing and trueing 4 ) linear motors
~Roberto Mancina, Production Engineer, Fino Mornasco, Italy
Development of actual skating surfaces, differing materials including carbon & stainless steel.
~Ian R, Partner in specialist skate co, Blackburn, Lancs, U K
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Q:
From your perspective, which companies are creating the most innovative grinders and grinding machines?
16 answers
Answers:
There are several out there with good ideas such as Super Tech, but we ran into many problems. With some work they could be a good grinder. My old mid-size seems to be better than my new sharp design. The column moves, where on the old sherp, just the table moves. Which is more ridged.
~SKR R, Mfg.Mgr., Shreveport, Caddo
1 ) Junker and others for high speed grinding 2 ) Walter and others for the CNC technology 3 ) EWAG and others for the PCD grinding 4 ) Okamoto and others for the linear motors technology
~Roberto Mancina, Production Engineer, Fino Mornasco, Italy
I will take an old brown & sharpe any day, but okamoto, mitsui, harig are as good as it gets today.
~JIM M, Technical Support, GUADALAJARA, MEXICO
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Applications and UseTop

Q:
What are some of the applications you have used grinders and grinding machines for?
49 answers
Answers:
With Cylindrical Grinding, Internal Grinding, Surface Grinding, Thread Grinding, Profile Grinding, Gauge Grinding, Center Grinding, Spline shaft Grinding and Tool and Cutter Grinding Machines. Have applied these m/cs for Rough grinding, Finish Grinding and Lapping applications besides using Dia-Form for very accurate template grinding on surface grinders.
~Engineering, Consulting, BANGALORE, India
Slideway grinding (parts of machine tools), Internal & external cylindrical small batch work, Surface grinding (Jobbing). High volume production grinding of small parts using our own product (Curtis 'Vector' cylindrical grinder with integral parts loader) - trials for customer's application evaluations and process validation.
~Engineering, Design, Colchester, Great Britain
My company manufactures diamond & CBN wheels; grinding machines are the means for using our products. We need to know them deeply for optimizing our products. Moreover, we designed and manufactured dressing and profiling machines for manufacture and maintenance of Diamond & CBN wheels
~Roberto Mancina, Production Engineer, Fino Mornasco, Italy
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Q:
Please share with us any “non-standard” applications that grinders and grinding machines have been used for.
14 answers
Answers:
1 Turboshaft vane and groove grinding. Dressable CBN wheel peel grinds the vane outside profile. Metal bond non-dressed wheel grinds the groove(s), separate operations. Pairs of machines have been supplied with pre-process part monitoring, post process size control, linked handling and with post grind stations for superfinishing, deburring, washing and final inspection. 2 Grinding carbide disks (cutter knives) using diamond wheels dressed with a silicon carbide rotary dressing system. High stock removal, the parts handling system grinds both sides of the component incrementally to maintain flatness 3 Grinding diesel injector nozzle tips on a fixed mandrel (locating in the valve seat) with a lunette centre, and friction driver consisting of opposed rotating elastomer wheels. Two such spindles are fitted in an indexing workhead, largely eliminating the time to load and unload the workpiece and giving very fast cycle times. 4 Oilwell drilling tool bits composed of a diamond wear face on a tungsten carbide body are ground on 2 ends with either chamfer or radius. The diamond grinding oscillates across the workpiece, which rotates in a spindle itself mounted in a workhead which rotates about a vertical axis, thus generating the profile using 3-axis interpolation. The machine is fitted with post-process gauging and a separate robot wash / dry / palletise station. 5 'Grind-from-soild' application where very small (1mm diameter) valve parts are machined in 2 plunge cuts and parted off. A magazine supplies metre long stock lengths to a barfeed: The grinding spindle is fitted with a 3-jaw chuck, a swing-down tailstock supports the material at the free end. A cnc slide carrying a second chuck grips the part after grinding whilst a swingdown slitting wheel makes a cut. 'Conventional' Alox wheel with diamond roll dressing. 6 Thread grinding using plated CBN grinding wheel. Pump shafts requiring imm pitch threads with a given (variable) start point are ground with a multi-groove non-dressed wheel in less than half the time taken using old technology. The machine runs un-attended (apart from changing workpiece pallets) without gauging. Wheel lifetime in excess of 40,000 components. 7 Turbo vane shanks and faces are ground on a twin spindle machine with a secondary surface grinding station. Cylindrical grinding is with CBN wheel and diamond roll full-form dresser: Surface grinding with either dressable or plated wheel. The shank is gauged in-process whist the face is gauged post-process. Production rate 240 parts per hour.
~Engineering, Design, Colchester, Great Britain
Cylindrical cone grinding on surface grinders-semi auto. Grinding "squashy" cylinder liners with in process gauging and dwell to finish allowing for wheel deterioration. Grinding shafts with ball bearing grooves in one op. Grinding Track rod ballpins with tapers in one op with auto loading. Plunge then back through-feeding stepped shafts. Grinding shaped forms on blanks for pressing on modified centreless m/c. Orientating and loading jet engine parts with odd (a-symetrcal) heads for stem grind. Loading washer type spacers and feeding through centreless grinder safely.
~Robert S, Maintenance & Engineering Manager., Solihull, United Kingdom
I HAVE GROUND EVERY THING YOU CAN THINK OF ON A SURFACE GRINGER AT ONE TIME OR ANOTHER,ITS JUST TRING TO HOLD YOUR PIECE
~JIM M, Technical Support, GUADALAJARA, MEXICO
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of grinders and grinding machines?
17 answers
Answers:
Pay attention to the grinding liquid. Could strongly damage the machine. Pay attention to the balancing of the tools and quills. Rotating elements have to be maintained by well skilled people. For good results: use the appropriate clamping material and strategy.
~Marc V, Project Manager, Neuchâtel, Switzerland
Apart from smashed wheels a lot of money has been wasted buying alternative equipment when the problems lay in poor quality and lack of control of parts presented to the machine (as in 9).
~Robert S, Maintenance & Engineering Manager., Solihull, United Kingdom
1 ) using low quality or under dimensioned machines for the considered grinding process 2 ) upgrading machines in the hope of sparing the purchase of a more suitable new machine
~Roberto Mancina, Production Engineer, Fino Mornasco, Italy
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
18 answers
Answers:
See #3. The machines we sell ('Vector' high output, low overhead cylindrical grinders) have unique features making them ideal for a relatively small range of applications. These attributes are: Auto loading as standard; grinding within a sealed wheel guard; small footprint; lifetime economy; suited to state-of-art grinding processes; range of standard options for non-standard applications.
~Engineering, Design, Colchester, Great Britain
Wheel speed control proportionate to diameter. Auto swivel functions to wheel head and work head. CNC form dressing. Solid vibration absorbing construction. Versatile automatic product load, hold and unload. In process gauging and compensation.
~Robert S, Maintenance & Engineering Manager., Solihull, United Kingdom
1 ) open programs for the CNC technology 2 ) more flexible dressing system for high speed grinding 3 ) more efficient dressing system for PCD grinding 4 ) cost reduction for the linear motor machines
~Roberto Mancina, Production Engineer, Fino Mornasco, Italy
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using grinders and grinding machines?
13 answers
Answers:
These days always buy direct dive. If you bend the spindle throw it away and get a new motor. When teaching new people how to use these machines make sure you have someone with experience show them how to use it properly or it will cost you a new spindle.
~JIM M, Technical Support, GUADALAJARA, MEXICO
If you plan to buy, see them in action, under the same application if at all possible. Many Sales people can assist in this area.
~SKR R, Mfg.Mgr., Shreveport, Caddo
Please look for the reliability of the machines including the makes of the products used in the machines and the accessories.
~Prabhakar J, General Management, Bangalore, India
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of grinders and grinding machines?
14 answers
Answers:
Skate sharpening is an acquired skill and the best results are produced using machines which rely heavily on the operative. Steady pressure of blade against wheel is required, otherwise the shape of the blades is changed causing all sorts of problems. Two even edges at the correct angle of bite for the individual.
~Ian R, Partner in specialist skate co, Blackburn, Lancs, U K
Don't let pre-convention restrict what might be possible on any machine but always remember; a grinding machine is not a rectifier of previous operation scrap parts. What you get out will be greatly influenced by what you put in.
~Robert S, Maintenance & Engineering Manager., Solihull, United Kingdom
Make sure the abrasives used conform to all the safety factors including the safe speed rating of the abrasives to the machine e.g. the abrasives must have a faster speed rating than the machine and conform to the OSA regs.
~Daniel S, Sales Manager, Norwich, UK
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