Circumferential Speeds for High Speed Twist Drill Chart
The screw speed is considered as an essential machine=related process parameter and is used as an input variable for establishing the operating point. It is the circumferential screw speed, however, that is relevant to the quality of the melt. The molder should get used to dealing with circumferential speeds.
The circumferential speed, or alternatively the revolutions per minute, is preselected process parameters on the display device of the machine control unit. It is necessary to verify the selected data very precisely or, at least, to reproduce them exactly. Most machines nowadays do not measure rotational or circumferential speed and, accordingly, the feeding process would help to raise the quality of injection molding, especially if just-in-time production necessitates exchanging machines.
At present, the screw-driving hydraulic motor is almost exclusively regulated with position controlled proportional valves or servo valves. Also available is a very precise speed control with a three-phase servo electric motor that is regulated by a resolver. These solutions, which are not inexpensive, are offered the most machine producers today because they eliminate the need for reduction gear, which would be required otherwise.
| Ferrous Materials |
|
|
|
| Non Alloy Steels |
|
|
| (a) Upto 0.40% Carbon Content |
80-100 |
24-30 |
| (b) 0.40% to 0.70% Carbon Content |
60-80 |
18-24 |
| (c) Over 0.70% Carbon Content |
40-60 |
12-18 |
|
| Alloy Steels |
|
|
| (a) Upto 60 tons Tensile |
50-70 |
15-21 |
| (b) 60-80 tons Tensile |
30-50 |
9-15 |
| (c) Over 80 tons Tensile |
15-30 |
4.5-9 |
|
| Austenitic Stainless Steel |
|
|
| Non Magnetic |
|
|
|
| Magnetic Stainless Steel |
|
|
| Steel Magnetic |
40-60 |
12-18 |
|
| Alloyed Cast Iron |
50-70 |
15-21 |
|
| Grey Cast Iron |
80-100 |
24-30 |
|
| 12-14% Manganese Steels |
12-14 |
3.5-4.5 |
|
| Non Ferrous Materials |
|
|
|
| Bronze Ordinary |
100-200 |
30-60 |
|
| Brass |
200-250 |
60-75 |
|
| Copper |
65-70 |
19-21 |
|
| Magnesium & Magnesium |
200-300 |
60-90 |
|
| Alloys |
|
|
|
| Monel Metal |
20-50 |
6-15 |
|
| Nimonic Alloys |
20-30 |
6-9 |
|
| Nickel |
30-50 |
9-15 |
|
| Zinc base Alloys(mazac) |
150-250 |
45-75 |
Related References:
Screw Thread Limits Table
UNC UNF Threads Per Inch TPI Threads Per Inch
Wood Screw Pilot Hole Sizes Table
Standard NPT National Pipe Thread Tap Drill Sizes Table
ASTM ISO Metric Thread Sizes and Tap Drill Table
Tapping Drill Size and Clearance Drill Size for Metric Threads
Standard Number Drill Sizes Table
Metric Thread Size Tap Drill Table
Standard Tap Drills Clearance Holes Table
Standard Letter Drill Sizes Table
Standard Drill Sizes Decimal Equivalents Table
Socket Head Cap Screw Sizes Dimension Table
SAE Grade ASTM Bolt Identify Marks Mechanical Properties
Steel Bolt Torque Specifications Table
Finished Hex Nut Dimensions
Heavy Hex Nut Dimensions Table
Standard ANSI Type B Flat Washer Sizes
Circumferential Speeds for High Speed Twist Drill Table
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