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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
This month we will discuss
"Qualifying Reference Surfaces of Hobs". Each hob, depending upon its diametrical pitch
and class, has a certain standard for runout on three qualifying surfaces. These three surfaces
give the operator of your hobbing machines a "truing surface" to verify that the hob is
within the proper tolerance when setting up the machine. It also gives the operator of the Hob
Sharpening Machine a reference surface to verify that the hob remains within its tolerance after
it has been sharpened. Excessive runout in the hob on any of these surfaces can indicate other
problems with the machine such as a bent hob arbor, bad spindle bearings, a worn end support,
or even an out of level condition of the machine.
The accepted tolerances are as
follows:
Diametrical
Pitch
|
| 1-1.999
| 2-2.999
| 3-3.999
| 4-4.999
| 5-5.999
| 6-8.999
| 9-12.999
| 13-19.999 |
Runout
(1-4 Thread)
| Class |
| Hub Face
| AA |
|
|
2 |
2 |
2 |
1 |
1 |
1 |
| A |
8 |
5 |
2 |
2 |
2 |
2 |
2 |
2 |
| B |
10 |
8 |
4 |
4 |
3 |
3 |
2 |
2 |
| C |
10 |
8 |
4 |
4 |
3 |
3 |
2 |
2 |
| D |
10 |
8 |
5 |
5 |
4 |
4 |
3 |
3 |
| Hub Diameter
| AA |
|
|
2 |
2 |
2 |
1 |
1 |
1 |
| A |
10 |
5 |
4 |
3 |
3 |
3 |
2 |
2 |
| B |
12 |
8 |
6 |
5 |
4 |
4 |
3 |
2 |
| C |
12 |
8 |
6 |
5 |
4 |
4 |
3 |
2 |
| D |
15 |
10 |
8 |
8 |
6 |
6 |
5 |
5 |
| Outside Diameter
| AA |
|
|
5 |
4 |
3 |
3 |
3 |
3 |
| A |
30 |
20 |
15 |
15 |
10 |
10 |
10 |
10 |
| B |
40 |
30 |
25 |
20 |
15 |
15 |
15 |
10 |
| C |
50 |
45 |
40 |
25 |
20 |
17 |
17 |
12 |
| D |
60 |
55 |
50 |
45 |
35 |
35 |
30 |
25 |
Note: All Readings are in ten-thousandths
of an inch.
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. We wish everyone a Happy and Joyful Easter and St. Patrick's day.
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