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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
One of the prime requirements for figuring change gear setups on
Barber-Colman Hobbing machines is the proper machine constants. When Barber-Colman manufactured their machines, it was their
procedure to install plates on each change gearbox that gave the formula, constant, and change gears for the appropriate
requirements. However, it was impossible to cover all possible uses of the machine such as multiple thread hobs, helical gears,
worms, etc. Therefore it is necessary for the user to figure the proper change gears for these unusual instances. I find that many
times these plates have been painted over, lost, or otherwise made unreadable. Therefore below you will find the common constants
for Barber-Colman Hobbing machines.
| Hobbing Machine Constants |
| Machine |
Index Worm |
Index |
Feed |
Differential |
| 6-10,16,20 |
1 Thread |
36T/N |
F/0.225 |
15/L |
| |
3 Thread |
12T/N |
F/0.075 |
5/L |
| |
6 Thread |
6T/N |
F/0.0375 |
2.5/L |
| |
1 Prc |
24T/N |
F/0.150 |
10/L |
| |
3 Prc |
12T/N |
F/0.075 |
10/L |
|
| 16-16,36,56 |
1 Thread |
30 T/N |
F/0.075 |
15/L |
| |
2 Thread |
15 T/N |
F/0.0375 |
7.5/L |
| |
4 Thread |
7.5 T/N |
F/0.01875 |
3.75/L |
| |
6 Thread |
5 T/N |
F/0.0125 |
2.5/L |
|
| 14-15,30 |
1 Thread |
24 T/N |
Var |
N/2TL |
| |
2 Thread |
12 T/N |
Var |
N/2TL |
|
| 10-20 A |
1 Thread |
18 T/N |
Var |
N/2TL |
| |
2 Thread |
9 T/N |
Var |
N/2TL |
|
| 10-20 B |
1 Thread |
18 T/N |
F/0.400 |
N/2TL |
| |
2 Thread |
9 T/N |
F/0.200 |
N/2TL |
|
| 16-15 |
1 Thread |
30 T/N |
Var |
N/TL |
| |
2 Thread |
15 T/N |
Var |
N/TL |
|
| 25-15,30 |
1 Thread |
24 T/N |
Var |
N/TL |
| |
2 Thread |
12 T/N |
Var |
N/TL |
| 40-15 |
1 Thread |
30 T/N |
Var |
N/TL |
| |
2 Thread |
15 T/N |
Var |
N/TL |
Where:
T = Number of threads in the hob.
N = Number of teeth in the gear being cut.
L = Desired lead of the helical gear.
If you have any questions concerning these formulas please feel
free to contact me at rpi@repair-parts-inc.com.
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