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I can't imagine that most any point won't serve your needs. If you were to use the diamond dresser for specific purpose, you may choose a given configuration, but for random use, as long as you have a point, it will do the job. I'd buy the least expensive one available that can be incorporated if cost is a factor. What I think I'd do if I was in your position is shop more from the standpoint of ease of mounting than anything. Even a short nib can be installed in a shank for later use on a pedestal or bench grinder, so no matter what you select you'll be able to use it for most any function.
For your consideration, a centerless grinder is capable of running a 24" diameter grinding wheel that can be 8" wide. A one carat diamond would be more than adequate for dressing the wheel for months on end. With diamonds, the one thing that is desirable is that they be used such that they can be indexed occasionally so the edge of the flat that slowly develops actually becomes the sharp point that does the dressing when the diamond is indexed. To accomplish that, the diamond is generally held at an angle, then just rotated occasionally. You might consider mounting yours in like fashion. An angle of 30° to the side would work nicely.
Try to keep the point of the diamond on center when in use on your lathe, along with the centerline of the wheel. If your wheel is not exactly at right angles, and you are either above or below center, you'll dress an angle on the wheel, which will then not be in proper contact with the part you intend to grind. It is 100% desirable for the wheel face to be parallel and in full contact with the part so the corner of the wheel cuts and the balance of the wheel sparks to provide a good finish, which, at best, won't be great when done in a lathe. That's the nature of the beast, and not intended to sound critical of your work.
My grinding experience goes back many years, at which time the cluster diamonds that are available today were non-existent. I've been told by a reasonably reliable source that the diamonds used in these things are long and thin (apparently man made to this configuration) and do a superior job of dressing wheels because their small diameter prevents a large flat from developing. I can't speak from experience, so I have no opinion. [img]/ubb/images/graemlins/confused.gif"%20alt="[/img] My purpose in mentioning this type dresser is that it would likely serve you considerably better than a single point diamond when dressing your bench grinder, especially if the information about their dressing ability is correct. It's a decision you'll have to make, letting cost be a part of your decision.
Be aware that a diamond dressed wheel is not desirable for anything except for precision grinding. A wheel on a precision grinder, when dressed by diamond, is so smooth that it has the feel of window glass when you touch it while running.
*** I don't suggest you try it! They cut like crazy on the corners, and ground flesh is very slow to recover because it is completely removed.***
This smooth surface makes hand grinding very difficult, with a lot of heat generated in the bargain. For the most part, precision grinders are always run with flood coolant to control the heat. The odd exception is on some surface grinders, but I don't recommend that, either.
If you intend to use the diamond on your bench grinder, be certain to get a dressing stick to go with it so you can slightly rough up the wheel surface after the diamond is used to true the wheel. That works very well and leaves the wheel in a much better condition for hand grinding. The dressing stick you buy should NOT be the solid one which is made of boron carbide and is ¼" X ½" X 3" long and cost about $20. These behave much like a dull diamond as they become worn, and don't leave a good surface on your wheel. The one you want will likely be 1" square X 6" long and cost about $2. They are made much like a grinding wheel, comprised of bonded small bits (perhaps 24 grit) of silicon carbide, and are shiny black in color. One will likely last you a lifetime.
I do not recommend star dressers on bench grinders if you use them for sharpening drills or other tools. It's difficult to get the wheel running true so they waste a lot of wheel, filling your shop with very undesirable dust as well. I do recommend a star dresser for large wheels that one may find in a welding or blacksmith shop where heavy grinding is commonplace. They do an outstanding job in that capacity.
Sorry to dump all this on you, but it was a quiet night! [img]/ubb/images/graemlins/grin.gif"%20alt="[/img]
Harold
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A diamond grinding wheel dresser is a vital tool in the proper care and maintenance of any grinding wheel. Regular maintenance ensures that your diamond grinding wheel will perform at maximum efficiency, trouble-free, and enjoy a long, sustainable life.
When selecting any dressing tool, including a diamond wheel dressing stick, it&#;s important to choose the tool that is the proper shape, size, and quality for the grinding wheel. If you don&#;t know which tool will work best with your application, discuss it with a supplier&#;s knowledgeable customer service department to determine exactly what you need.
Dressing the wheel will knock off any abrasive particles from the wheel&#;s surface. This ensures that it&#;s balanced and concentric, which minimizes any vibration it may get from having too much buildup on the surface. These particles, if left on the surface, have the potential to cover up surface abrasives, making them dull and ineffective. Exposing them by removing particles is essentially a sharpening process, since the fresh abrasive grains are each cutting tools in their own right.
A diamond grinding wheel dresser serves another important function, and that is to clean the grinding wheel. Choosing a dresser or grinding wheel dressing stick that is softer than the grinding wheel will not dislodge any abrasive particles, and can result in a loaded wheel. This is why selecting the proper dressing tools is crucial to a successful grinding wheel dressing.
There are also different types of dressers to consider. Star dressers feature long handles and serrated discs. Diamond dressers are generally preferred because of their superior strength. They also have shorter handles and are great for both dressing and truing. They are also available in single point and multi-set clusters to blade-specific type, and a reputable supplier will be able to determine which design to use based on your project. For example, a single point tool is easy to use and encourages a more pronounced rotation and higher frequency, delivering precise results.
Other benefits of a diamond grinding wheel dresser include a fast dressing of even the most complex wheels, a constant operation that boasts high-precision, and optimal dresser versatility. This type of dresser tool also means a decreased dressing cost per project, making it a cost-effective solution to all of your dressing needs.
Contact us to discuss your requirements of Diamond Dressing Tools. Our experienced sales team can help you identify the options that best suit your needs.