Wooden Block Plane Knobs
Different Sizes
The wooden knobs on Millers Falls block planes had just over 1/8 inch tolerance in both height and width. It’s likely the woodworking shop had multiple machines and or the profile changed after sharpening the cutters. Below is a chart showing the height and upper diameter from different models with threaded knobs.
Dimentions on Early Knobs
|
Model |
Type |
Height |
Diameter |
|---|---|---|---|
| 45 | T2 | 1-52/128 | 1-15/128 |
| 66 | T2 | 1-51/128 | 1-16/128 |
| 68 | T1 | 1-50/128 | 1-16/128 |
| 87 | T1 | 1-38/128 | 1-18/128 |
| 87 | T2 | 1-42/128 | 1-17/128 |
| 87 | T2 | 1-52/128 | 1-19/128 |
| 75 | T1 | 1-39/128 | 1-5/128 |
| 75 | T2 | 1-55/128 | 1-17/128 |
| 75 | T2 | 1-46/128 | 1-18/128 |
| 75 | T2 | 1-52/128 | 1-16/128 |
| 07 | T2 | 1-45/128 | 1-22/128 |
| 97 | T1 | 1-49/128 | 1-19/128 |
| 97 | T1 | 1-39/128 | 1-9/128 |
| 700 MS | 1-52/128 | 1-19/128 | |
| 700 MS | 1-53/128 | 1-15/128 | |
| 700 MS | 1-42/128 | 1-16/128 |
The external screw knobs started down the same path so there was no need to continue with them.
Here are two pictures of the extremes in height and diameter.
Difference in width of 17/128" or just over 1/8"
Difference in height of 17/128" or just over 1/8"