Basics of the Cylindrical Grinder provides a comprehensive introduction to different types and components of cylindrical grinding machines. The main methods of cylindrical grinding are plunge grinding and traverse grinding. The main types of cylindrical grinders are plain, universal, automated, and limited-purpose. Grinders may also be categorized by their method of workholding and method of control. Grinding wheels, maintenance, coolant, and grinding variables vary based on the operation.
Cylindrical grinding is a common operation performed to finish parts and bring them to tolerance. A cylindrical grinder operator must be familiar with the machine itself, as well as how to select and utilize wheels, workholding, and coolant, in order for the grinding operation to be successful. This foundational knowledge is necessary to reduce scrap, increase quality and production rates, and lower costs.
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Difficulty Intermediate
Format Online
Number of Lessons 18
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Language English
For true cylindrical work or form ground parts, the center height dosn't affect the workpiece form much. It does affect your actual workpiece diameter change for an adjustment of the infeed. The problem is cosine error for the radius of the wheel and difference in center heights.
Where it is most apparent is when you are grinding a taper because the angle changes and a straight taper can turn concave.
I have seen attachments built to match the center height of the workpiece. The attachment bolts to the table top and extends back to one end of the spindle and either indicates on the center of the spindle or on the top surface of the grinding wheel arbor. The simplest was an attachment called a centering gage used on the Cincinnatti #2 tool and cutter grinder that had a flat top that was lined up with witness marks engraved on the wheelhead casting. To center up, the mark was even with the flat top of the attachment and clearance angles were set by raising the wheelhead witness mark a measured distace over the top of the attachment.
If you do the math, on a 12" grinding wheel, a vertical error of .005" between the center gage and the engraved line turns out to be insignificant. .005" is well within most machinists eyeballing capability. The rest of us use reading glasses.
...mmm... the centre height is one of the parameters I don't have a problem setting !!!Bearing in mind this is a 40 plus year old grinder, though in quite good condition - the problem I was having is differentiating between the work head setting angle, and the swiveling table setting angle. These of course both add up to give the total setting angle. The work head angle can be easily approximated as its calibration ring is about 10" diameter, but only a tad out means the work head centre and the tailstock centre are way out of line when working to tenths of a thou.By clocking the swivle table tee slots to the long axis motion, then doing a test grind, and setting the swivle over half of the diameter error, I can produce work to the limits of my measuring equipment (half of a tenth of a thou) which is fine for the work in hand, but is tedious to set up. I was looking for shortcuts.One thing I do intend to do is incorportate better ways of mounting DTIs on the grinder as currently everything has to be a lash up with clamps and stout bars. I feel a few tapped holes might appear soon [img]/ubb/images/graemlins/smile.gif"%20alt="[/img]
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