Troubleshooting Tips: Centerless Grinding Concave work (low center)`, Work guides on entrance and exit sides deflected toward the grinding wheel. Also see . Centerless grinders are the dependable workhorses of the manufacturing world. With regular maintenance and TLC, your centerless grinding. Achieving consistent and quality results from the centerless grinding process requires an understanding of the basic fundamentals. Most application problems .
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Diamond cracked or broken; replace. Loose regulating wheel spindle bearings. Tighten diamond holder clamping screw; reset or replace diamond.
Store grinding and control center,ess in a dry place. Rough grind with more and smaller cuts, or use harder wheel for roughing.
Stock removal too fast.
Increase work speed; use softer wheel. Wavy traverse lines due to faulty dressing, leaving ragged wheel edges. Use coolant filter for fine finishes. Long blades will cause chatter unless blade angle is reduced. Worn gears in hand feed unit. Motor bearing defective or armature out of balance.
Angle on work blade too low Gradually increase blade angle until right Loose or tight regulating wheel chain will cause periodic or intermittent flats grining work piece.
Dress wheels correctly, and, if necessary, increase inclination angle gdinding regulating wheel spindle so work feeds all the way out. The grinding sound suddenly becomes high The grinding sound suddenly becomes low The grinding sound alternates between loud and quiet Feed marks are left on the workpiece Grinding affected layer Grinding ability decreased The grinding ratio is being decreased Grinding burns appear Warping occurs for surface grinders Poor surface roughness Poor workpiece tolerance Roundness is poor Cylindricity is poor Scratches appear irregularly Screw-like scratches appear Isolated scratches appear Chattering occurs at regular intervals Uniformly distributed chattering occurs Chattering occurs irregularly.
Use only one standard or blotting paper gasket under each flange.
Insufficient coolant when grinding tubing or other hollow work such as pistons, etc Increase flow of coolant at point of contact. Use coarser or softer wheel. Increase flow of coolant.
Try a different coolant, or if soluble oil used, cut down soda content of coolant. First pass should be a light cut with high spindle housing angle but slow regulating wheel speed. Work piece over size generallyor under size a few tenths of a thousandth. Loose spindle bearing Adjust spindle bearings.
Scale from hardened work, or dirty oil, solder, welding flux, etc. Immediately upon receipt, all grinding wheels should be closely inspected for possible damage in transit. Make first cut light at high traverse rate to attain maximum straightening effect. Irregular flats on in feed work pieces when work left between wheels too long.
Even fine spiral diamond lines Dress at slower traverse rate. Use only one gasket under each flange. Particularly when doing in feed centerlexs, be sure to lubricate all slides in accordance with instructions.
Lubricate per manufacturers “Lubrication Instructions and Specifications”.
Use crowned cam when dressing grinding wheel. Use a coarser grained wheel with more open bond to allow greater chip clearance.
Insufficient lubrication at lower slides causes slides to hang and jump. Substitute harder grade or finer grained wheel Rough uneven finish. Determine whether caused by type of wheel, dull diamond, dirty or too strong a coolant. Substitute harder grade or finer grained wheel. Make certain none of the pieces are oversize, particularly on in feed. If water hard, treat with a water softener before mixing with oil.
Barely contact wheel face at high spot—dress across face only, starting at an edge, do not start on face. Work centreline too low. Wheel should be just a nice sliding troibleshooting Maximum clearance of 0. Reset gib Loose work support blade allows deflection.
Grindig support blade too thin Use a heavier blade.
To adjust slide either way a few tenths of thousandths trroubleshooting so with a 0. Bowed short piece, about twice length of wheel face. Loss of cutting action. Use plenty of coolant for dressing and grinding. Be sure gaskets and flanges are clean. If they do not emit a clear, ringing sound, they are cracked and should not be used.
Scratches appear irregularly Increase the dresser’s setting angle Decrease the infeed rate and traverse feed rate Clean around the Coolant Back to Top. Especially on tubing, pistons, etc. Be certain all stations are kept properly lubricated. Clean coolant tank and machine. Make certain support slot free of dirt grknding inserting blade.