SHCS (Socket Head Cap Screw) Knob Caps - Inch and Metric - Four Styles - Multiple Sizes
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A cap to turn a SHCS into a knob.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Mechanical Parts
- Licencja
- Creative Commons — Public Domain
UPDATE : [May 14, 2024] Added STEP files.
NOTE : This set of prints is now complete, with the sizes and dates added as follows :
- 05/18/22: #4,#6,#8,M2,M3,M4
- 05/10/22 : #10, M5
- 05/19/22 : 1/4",M6
- 05/10/22 : 5/16", M8
- 05/19/22 : 3/8",M10
These knobs or caps press-fit onto a SHCS screw head to create a screwed knob. They are simple to use : A SCHS of appropriate size is simply pressed into the cap using a vise or arbor press.
These caps are modeled on the Shear-Loc brand (patents expired).
There are four types of cap :
- K : Knurled
- R : Rosette
- T : Tee
- L : L
However, note that not all styles are provided for all screw sizes. In addition, I am providing these in various sizes and styles as time permits, so at the time you are reading this it may be that not all of the versions indicated in the table are available.
In the table, the check-mark (✓) indicates the sizes and style that are (or will be) available, and the date that those styes were added. If the date is blank, the indicated size/style is still pending.
| Inch Screw Size | Inch Knob Size | Metric Screw Size | Metric Knob Size (mm) | K | R | T | L | DATE MM/DD/YY |
| #4 | 5/16 | M2 | -- | ✓ | 05/18/22 | |||
| #6 | 3/8 | M3 | 9.6 | ✓ | 05/18/22 | |||
| #8 | 1/2 | M4 | 13 | ✓ | 05/18/22 | |||
| #10 | 5/8 | M5 | 16 | ✓ | ✓ | ✓ | 05/10/22 | |
| 1/4 | 3/4 | M6 | 19 | ✓ | ✓ | ✓ | 05/19/22 | |
| 1/4 | 1 | M6 | 26,38 | ✓ | ✓ | 05/19/22 | ||
| 5/16 | 1, 1-1/2 | M8 | 26,38 | ✓ | ✓ | ✓ | ✓ | 05/10/22 |
| 3/8 | 1-1/2 | M10 | 38 | ✓ | ✓ | 05/19/22 |
Note that in the file names :
- 1/4 is 1-4
- 5/16 is 5-16
- 3/8 is 3-8
Assembly
Be aware that it is necessary for the plastic knob to be slightly elastic, so it is better if the cap is not too cold (and brittle) when pressing in the screw head.
To use the caps, use a vise or an arbor press to press the head of the screw into the cap. Be careful to align the screw before pressing so that it goes in straight. Press the screw head in firmly and completely, but avoid excessive force that may crack the cap.
After making a few more sizes of these, I have found that the “socket” diameter is very critical to a good fit without cracking. It is also important to align the screw well before pressing it into the socket, as it is difficult or impossible to straighten it out once it is pressed in.
These prints are all sized with PETG filament in mind, so if a different filament is used it may be necessary to scale the prints slightly to allow for differing amounts of “stretch” in different filaments.
Print Instructions
Note : File names include the size and type of each cap. For example :
- CapM5Tee - Cap = size M5, style Tee
Print in PETG using the 3mf or gcode files provided. In general :
- 0.2mm layer height
- perimeters = 3 (for the smaller sizes - #8,M4 and smaller- 2 perimeters)
- 15% rectilinear infill (for the smaller sizes - #8,M4 and smaller- 0% infill)
CAD
The OnShape 3D CAD files for this are here :