天文观测仪130PD蜘蛛型号

Sky-Watcher 130PDS Spider

2024-03-27 01:44:05

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Summary

A 3D printed spider replacement for the Sky-Watcher 130PDS newtonian telescope.

The original spider was quite bad, prone to bending and producing uneven diffraction spikes (it had to be perfectly centered in the tube, I usually just measured the distance from the aluminum piece and the tube with a caliper). This design eliminates that problem, because of the circle around the whole spider. This does however introduce a problem in the form of the notch in the tube that connects the ends of the metal sheet in the tube production. The angle from a spider vein and the notch in my design is 14,5°, let me know if yours is any different and I may be able to supply you with a model that fits :)

Assembly

To use the design you need an M8x1.25 (standard M8) tap. Alternatively, you can download and use the model with threads build-in, however that has not been tested. After printing, remove all stringing and check if you have smooth walls on the veins. Simply run you nail vertically in you feel any bumps from layers, if you don't, great, but if you do, you may want to reprint your part (although it is probably fine).
Next disassemble the original SW spider and take the aluminum piece. It goes into the middle of the printed spider. The piece screws into place through the holes on the spider, using M3 screws. You can use the screws that came with the original spider, but I recommend using allen screws, because it can be quite difficult to turn the screw due to its uncomfortable position. M3 x 8 mm screws work best (these happen to be the same screws used in the SW crayford focuser, but you can use slightly shorter ones.
Then put on the secondary mirror as standard, take an M5 screws (25 or 30 mm work best) and put it in the deeper hole in the center of the aluminum, on the other side, in the shallower hole put the spring and thread the mirror on there (I also put a steel washer between the collimation screws and mirror holder, to prevent scratches). Then thread in the collimation screws.
After that, put the cap of the telescope tube off and slider the new spider in. Secure it with four M8 x 8 mm screws (10 mm length also works, but you may need to sand them), then put the cap back on. Collimate the telescope as normal.

This spider should produce better diffraction spikes than the original Sky-Watcher one, especially paired with a primary mirror mask.

Print Settings

Printer brand:
Creality
Printer:
Ender-3 V3 SE
Rafts:
No
Supports:
No
Resolution:
0.12 mm
Infill:
30%
Filament brand:
Extrudr
Filament color:
Matte Black
Filament material:
PETG
Notes:
Make sure to print 100% infill around the center (I used a 50 x 50 x 50 mm cube in the center) and around the M8 holes (I used 25 mm cubes), to prevent problems when tapping.