Vd = ns * bd / Ud
bd = effective width in mm
ns = grinding wheel rpm
Ud = overlap ratio
Vd = dressing feed velocity in mm/min
Practical experience has shown the folling values of overlap ratio Ud to be a useful guidelin: |
| Roughing: |
2 - 3 |
| Standard grinding: |
3 - 4 |
| Finishing: |
4 - 6 |
| Fine finishing: |
6 - 8 | |
| Attention!
The dressing traverse feed rate should be at least 500 to 700 mm/min (20 to 28 inch/min)
Rule of thumb:
Traverse dressing feed rate Vd:
if bd < 3 mm vd = (ns * bd) / 4 = mm/min
if bd > 3 mm vd = (ns * bd * 0.35) / 4 = mm/min
ns = wheel rpm |
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| Determination of MCD cross-section and number of MCD logs:
Cross-section :
MCD 0.6 x 0.6 mm for grit size 91 and finer
MCD 0.8 x 0.8 mm for grit size 126 and coarser
Number of MCD logs:
Wheel diameter:
up to 100 mm = 2 MCDs
up to 500 mm = 3 MCDs
Traverse feed rate:
Vd = (ns * cross-section bd) / 4 (Ud)
(standard grinding Ud = 4)
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| Speed ratio qd (vR/vc):
Synchronous 0.8
Asynchronous -0.5 to -0.8
Relative dressing direction:
Synchronous = high metal removal rates
Asynchronous = fine surface finish
Depth of cut ad per pass:
0.005 to max. 0.01 mm (0.0002 to 0.0004 inch)
Traverse dressing feed rate Vd:
150 to 200 mm/min (6 to 8 inch/min)
(traverse feed is dependent on surface speed;
0.005-0.02 mm (0.0002-0.0008 inch) per wheel revolution)
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