2" Crayford Focuser
Katherine Barker
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Veröffentlicht:2025-12-01 21:54:25
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2 inch focuser for telescopes, 72mm tall + 26.5mm travel. So far the only mounting plate is for GSO 6" Newtonian tube, but if you need another, drop me a message and I might be able to help. Or you can change dimensions in the first 2 sketches of the source Onshape link.
Printing
Print in the orientation shown below, without supports. Only part in need of supporting is large hole on the Mounting plate. Use at least 2mm thick walls on the focuser body, draw tube and mounting plate.
Bill of Materials
| Item description | Material or spec. | Quantity |
| 10x2 plate, 5 mm long | Steel or brass | 1 |
| 10x2 plate, 71 mm long | Steel or brass | 3 |
| ø5x117 rod, chamfered, 2 flats on ends | Steel | 1 |
| 604 bearing (ø12ø4x4) | - | 4 |
| Printed thumbscrews M4x20 or any other thumbscrews M4x16mm | ISO 4017 M4x20 | 5 |
| M4x20 hex socket head screw | ISO 4762 M4x20 | 9 |
| M3x16 hex socket countesunk head screw | ISO 10642 M3x16 | 10 |
| M4 Nut | ISO 4032 | 4 |
| M4 Nylock nut | DIN 985 | 1 |
| M3 Flathead rivet nut | - | 4 |
For guide to printing thumbscrews, look here: Encased thumbscrews M3, M4 & M5
Assembly
For assembly, follow the diagrams below
Top row of internal bits above is M4 nut and Stop block, bottom row is M4 nylock nut, 10x2 plate 5mm long and Cradle.
The rivet nuts are used as they are for their low profile, no need to squash them to the tube with a special tool.
Onshape source
Support
All my work is free and in the public domain when possible. If you find it valuable, you can support me on Ko-fi. 
Telescopes collection
If you are interested in other telescope and astronomy related items that I have made, have a look at my Telescopes collection here on Printables.
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