1. A method for throughput optimization of a hard disk drive (HDD) comprising:
determining a position error signaling (PES) for a HDD mounted in a chassis based on a dynamic disturbance;
calculating a critical parameter of the PES;
determining a performance parameter for the HDD; and
indicating a first mechanical design modification of the HDD or the chassis if the critical parameter of the PES exceeds a pre-defined threshold or if the performance parameter for the HDD fails to meet a pre-defined tolerance.
2. The method of claim 1, wherein the PES is a percent track offset.
3. The method of claim 1, wherein the critical parameter is a mean of the PES.
4. The method of claim 1, wherein the dynamic disturbance is from a fan associated with the chassis.
5. The method of claim 1, further comprising:
correlating the PES to throughput of the HDD; and
indicating a second mechanical design modification of the HDD or the chassis based on the correlation between the PES and the throughput of the HDD.
6. The method of claim 1, further comprising:
correlating the PES to dynamics of a fan associated with the chassis; and
indicating a second mechanical design modification of the HDD, the fan, or the chassis based on the correlation between the PES and the dynamics of the fan.
7. The method of claim 1, further comprising:
identifying a location of the HDD in the chassis; and
determining whether the dynamic disturbance at the location of the HDD in the chassis is higher than another dynamic disturbance at another location in the chassis.
8. The method of claim 1, further comprising:
determining acceleration data for the HDD based on an on-board acceleration sensor; and
correlating the PES to the acceleration data to detect another dynamic disturbance prior to the another dynamic disturbance causing another PES.
9. The method of claim 8, further comprising managing a rotational vibration or a linear vibration of the HDD in response to detecting the subsequent dynamic disturbance to reduce the subsequent PES.
10. A hard disk drive (HDD) comprising:
a processor configured to:
determine a PES for the HDD mounted in a chassis based on a dynamic disturbance;
calculate a critical parameter of the PES;
determine a performance parameter for the HDD; and
indicate a first mechanical design modification of the HDD or the chassis if the critical parameter of the PES exceeds a pre-defined threshold or if the performance parameter for the HDD fails to meet a pre-defined tolerance.
11. The HDD of claim 10, wherein the PES is a percent track offset.
12. The HDD of claim 10, wherein the critical parameter is a mean of the PES.
13. The HDD of claim 10, wherein the dynamic disturbance is from a fan associated with the chassis.
14. The HDD of claim 10, wherein the processor is further configured to:
correlate the PES to throughput of the HDD; and
indicate a second mechanical design modification of the HDD or the chassis based on the correlation between the PES and the throughput of the HDD.
15. The HDD of claim 10, wherein the processor is further configured to:
determine acceleration data for the HDD based on an on-board acceleration sensor; and
correlate the PES to the acceleration data to detect another dynamic disturbance prior to the another dynamic disturbance causing another PES.
16. An information handling system comprising:
a processor;
a hard disk drive (HDD) communicatively coupled to the processor; and
a computer-readable medium communicatively coupled to the processor and having stored thereon instructions configured to, when executed by the processor:
determine a PES for a HDD mounted in a chassis based on a dynamic disturbance;
calculate a critical parameter of the PES;
determine a performance parameter for the HDD; and
indicate a first mechanical design modification of the HDD or the chassis if the critical parameter of the PES exceeds a pre-defined threshold or if the performance parameter for the HDD fails to meet a pre-defined tolerance.
17. The system of claim 16, wherein the critical parameter is a mean of the PES.
18. The system of claim 16, wherein the dynamic disturbance is from a fan associated with the chassis.
19. The system of claim 16, wherein the instructions are further configured to:
correlate the PES to throughput of the HDD; and
indicate a second mechanical design modification of the HDD or the chassis based on the correlation between the PES and the throughput of the HDD.
20. The system of claim 16, wherein the instructions are further configured to:
correlate the PES to dynamics of a fan associated with the chassis; and
indicate a second mechanical design modification of the HDD, the fan, or the chassis based on the correlation between the PES and the fan dynamics.
21. The system of claim 16, wherein the instructions are further configured to:
determine acceleration data for the HDD based on an on-board acceleration sensor; and
correlate the PES to the acceleration data to detect another dynamic disturbance prior to the another dynamic disturbance causing another PES.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device for machining grooves (20) in a cylindrical bore emerging at the end of a workpiece (1), characterized in that i said device comprises:
a cylindrical tool (44) with a peripheral set of teeth (45) formed by a series of cutting teeth (46) which extend obliquely with respect to the axis (42) of the tool, said tool (44) being inserted axially in the bore of the workpiece (1);
a tool-holder shaft (39), at one end of which the tool (44) is fixed in such a way as to extend in the axial extension of the shaft (39);
first means of driving the shaft (39) in an orbital movement about a fixed axis (37) which intersects the axis (42) of the shaft (39) and of the tool (44) at a point (43) situated at a forward end of the set of teeth (45) of the tool (44);
second means (47, 48) of immobilizing the shaft (39) in rotation about its axis (42);and
third means of relative displacement in axial translation of the workpiece (1) and of the tool-holder shaft (39).
2. The device according to claim 1, characterized in that the first means of driving the shaft (39) in orbital motion comprise a cylindrical component (36) whose axis is the said fixed axis (37) includes fourth means (38) of mounting this component in rotation about its axis (37) on a fixed support (30), and fifth means (41) of mounting the tool-holder shaft (39) in rotation about its axis (42) in a cylindrical orifice (40) that is eccentric with respect to the said component (36), and means (31, 34) of driving the component (36) in rotation about the said fixed axis (37).
3. The device according to claim 2, characterized in that the said cylindrical component is a long cylindrical socket (36) which is supported and guided in rotation at its ends by external bearings (38) carried by the fixed support (30), and which comprises a cylindrical housing (40) in which the tool-holder shaft (39) is supported and guided in rotation by fifth means of bearings (41).
4. The device according to claim 3, characterized in that one end of the socket (36) comprises an external set of teeth (35) engaged with a drive pinion (34).
5. The device according to claim 4, characterized in that the second means of immobilization (46, 47) in rotation of the tool-holder shaft comprise a double universal joint connecting to a fixed support (30) the end of the shaft (39) that is opposite to the one carrying the tool (44).
6. The device according to claim 5, characterized in that it said workpiece (1) is rotated about the axis (21) of the bore, for the formation of helical grooves (20) in the internal cylindrical surface (64) of the bore.
7. The device according to claim 6, characterized in that the external radius of the peripheral set of teeth (45) of the tool (44) is substantially equal to the internal radius of the bore.
8. The device according to claim 7, characterized in that the peripheral set of teeth (45) of the tool (44) is of generally truncated cone or cylindrical shape.
9. The device according to claim 8, characterized in that the number of teeth (46) of the tool is equal to the number of grooves (20) to be machined.
10. The device according to claim 9, characterized in that the speed of rotation of the first means of driving the shaft (39) in orbital movement is between 2500 and about 5000 revolutions per minute.
11. The device according to claim 9, characterized in that the relative speed of axial translation of the workpiece (1) with respect to the tool (44) is between 750 and about 1200 millimeters per minute.
12. The device according to claim 5 for machining grooves (20) for a passage of brake fluid in internal cylinder walls (8, 9, 10, 11) of a brake master cylinder (1) for a motor vehicle.
13. (canceled)
14. (canceled)