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RE-NEW MACHINE & MAINTENANCE, A Division of Repair Parts, Inc.
2415 Kishwaukee Street, Rockford, Illinois 61104
Phone: (815) 968-4499 Fax: (815) 968-4694
The One-Stop Shop for
Barber-Colman Machine Tools
- Machine tool reconditioning
- Repair and replacement parts
- Factory trained service
- Training -- operator, set up, or maintenance -- in your facility or ours
- Gear Machine Sales -- We have reconditioned hobbers & sharpeners in stock -- can be seen under power
- Hob sharpening
- Consulting and appraisals
When you are doing any metal machining it is very
helpful to know the cubic inches per minute of stock removal. This is no less true in gear cutting than in any
other machining operation. If you know this figure and you know the load limits of your machine, it is very easy
to determine if the machine is capable of cutting the part as you intend. In this month's column, I will give you
the formulas to figure the cubic inches per minute and the approximate Load. I will also include the suggested load
limits of Barber-Colman machines.
Cubic Inch Per Minute Formulas
Cubic Inch per Minute = Hob RPM X Feed per Work Revolution X Area
X Hob Threads
Approximate Load Formula
NOTE: The load will also be influenced by material
hardness, sharpening of the hob, pitch diameter of the work, and other factors. Therefore, you should use caution
when assigning a load value to a job and in the calculations of specific limits.
Suggested Machine Load Limits
| 6-10, 6-16, 6-20 machines |
0.15 to 0.25 |
| 16-16, 16-36, 16-56 machines |
0.75 to 1.50 |
| 14-15, 14-30, 22-15 machines |
1.50 to 2.50 |
| 10-10, 10-20 machines |
2.50 to 3.50 |
| 12-15, 16-15 machines |
3.50 to 4.50 |
| 25-15, 25-30, 40-15 machines |
3.50 to 4.50 |
We hope this information is of use.
If you have any questions or have a particular topic you would like to see discussed here, please
contact us.
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