Posts Tagged ‘diamond dressers’

In the Machine Shop, Diamonds are a Guy’s Best Friend

Thursday, June 7th, 2012

Jim Tapp, Tech Services DepartmentBy Jim Tapp
Goodson Tech Services

“Aren’t all diamonds alike? Why do you guys have premium and standard grades of diamonds?” If we’ve heard it once on the Tech Line, we’ve heard it a hundred times.

The quick answer is “yes, and no.” Not much help is it? Let me explain. All natural diamonds are created the same. After sustaining millions of years of ultra-high pressure, carbon turns into diamond. So in that sense, yes, all diamonds are alike.

Industrial Diamonds in raw stateBUT Industrial diamonds are an entirely different breed than the glittery ones that are made into jewelry. Industrial diamonds are chosen primarily for their hardness. Unlike gemstone diamonds, they aren’t chosen because of clarity. They vary in color because while the carbon is being pressured to become a diamond, other minerals get mixed in and contaminate the pure carbon.
Even within the realm of industrial diamonds there are different types; diamond stone and diamond bort. Diamond stone is used mostly in drilling bits for mining companies and it is incorporated into single or multiple-point diamond tools, such as Goodson diamond dressing tools. Diamond bort is used as loose grain abrasive for polishing.
The bottom line is that our premium-grade diamonds are harder than standard-grade and will hold a sharp edge longer. In addition, premium-grade diamonds have more points so that they can be reset more times than standard-grade.

Yes, diamonds have a higher unit cost than most other materials, but they also outlast virtually everything so they become very cost-effective.

To learn more about industrial diamonds, check out these two sources: http://minerals.usgs.gov/minerals/pubs/commodity/diamond/diamomyb03.pdf and http://en.wikipedia.org/wiki/Diamond#Industrial-grade_diamonds

As always, if you have technical questions about any Goodson product, call 1-800-533-8010 to talk with one of the Goodson Techxperts. Be sure to check out our Technical Library for a wide variety of tech tips.

Tips for Using a Diamond Dressing Tool

Thursday, April 19th, 2012

Diamond dressing tools are used in a wide variety of shop machines; everything from the valve refacer to the flywheel grinder to the crankshaft grinder. Knowing how to use your diamond dressing tools will result in longer life for the dresser AND the abrasive.

Never use a dull or broken diamond when dressing abrasivesCheck the Diamond Point

At the risk of sounding corny, a pointless diamond makes your diamond dressing pointless. Before using your dresser ALWAYS check the point of the diamond. If the point has been damaged or worn excessively, it should be replaced or reset. A rule of thumb is to have the diamond reset when wear on the facets exceeds 1/16” on a 1/2 to 3/4 carat diamond and 1/8” on a 1 carat or larger diamond.

Set the Diamond Dressing Tool Properly

Face dressing a stone with a diamond dressing toolTo avoid vibration be sure that the diamond dressing tool is mounted firmly in the holder and at the proper angle – generally between 10° and 15° from the surface. Smaller angles will blunt the diamond and larger angles may cause the wheel to remove some of the matrix material. Minimize the tool’s extension from the clamping point as well. Think of it like a diving board; the greater the extension, the more deflection and vibration there will be.

Keep the Diamond Cool

Coolant is REQUIRED during the dressing process. Not only does it help to carry away the swarf, it protects the diamond by cooling it. Start the coolant flow BEFORE staring the dressing process. Be sure that the coolant flow is adequate to keep the diamond point covered at all times. If the coolant flow over the diamond is interrupted for any reason, stop the coolant flow immediately so that it doesn’t suddenly start again. This can cause damage if the diamond is cooled suddenly after it has heated up. If you can, stop the dressing process immediately and determine what stopped the coolant flow. Allow the diamond to cool completely before restarting the dressing process. Not following this procedure could damage the diamond.