As for internal cylindrical grinding, the speed ratio between OD grinding wheel and workpiece is of paramount importance and should established correctly for any cylindrical grinding process. For example::
|
| Wheel peripheral speed: |
vc |
50 m/s |
| Workpiece diameter: |
dw |
40 mm |
| Workpiece RPM: |
nw |
400 RPM. |
| Workpiece peripheral speed: |
vw |
50'260 mm/min |
|
|
(400 RPM* Æ 40 mm* p) | |
| qs = |
Wheel peripheral speed vc * 1000 * 60 |
|
/ Workpiece peripheral speed |
| qs = |
50 (m/s) * 1000 * 60 |
|
/ 50'260 (mm/min) |
qs = 60
| Aim for the following values: |
Rough grinding: 60 to 80 |
|
Finish grinding: 80 - 120 |
| qs < |
50: |
danger of chatter marks |
| qs > |
120: |
danger of burning |
Guidelines for plunge grinding infeed rates:
| Speed of plunging: |
vf
|
0.35 - 1.5 mm/min (0.014 - 0.05 in./min)
(conventional machines) |
|
|
0.5 - 2.5 mm/min (0.018 – 0.1 in./min)
CNC machines |
For some machines the input may be in mm per revolution of the workpiece:
Rule of thumb:
|
ae |
0.003 - 0.015 mm per rev.
(0.00012 – 0.0006 in./rev.) | |
