Hi,
flanged bobbins for winding conventional iron core transformers are becoming increasingly hard to find in the right sizes and implementations. I'd like to examine sliced OPT winding and compare with conventional interleaving. Hence, I need bobbins with three or more chambers. Is fused deposition modeling a viable way to make them, despite the thermoplastic filaments? Which material would be preferred here? Or is stereolithography in general the better way, 'cause the resin doesn't need melting and the component isn't necessarily thermoplastic?
Best regards!
flanged bobbins for winding conventional iron core transformers are becoming increasingly hard to find in the right sizes and implementations. I'd like to examine sliced OPT winding and compare with conventional interleaving. Hence, I need bobbins with three or more chambers. Is fused deposition modeling a viable way to make them, despite the thermoplastic filaments? Which material would be preferred here? Or is stereolithography in general the better way, 'cause the resin doesn't need melting and the component isn't necessarily thermoplastic?
Best regards!
Hi, I printed bobbins on Creality K1. I even made a freeware software for bobbin design:
https://www.vacuum-tube.eu/wp/?p=821
Please note PLA deforms even at direct sunlight; PETG have thermal distortion resistance till ~70C; Nylon is horribly slow to print, requires heated chamber and filament dryer, more or less reasonable choice is Calibram BT.
I would suggest to use my software and cut bobbins from presspan with laser. Its cheaper variant, you can even impregnate finished transformers in the oven at 140C.
https://www.vacuum-tube.eu/wp/?p=821
Please note PLA deforms even at direct sunlight; PETG have thermal distortion resistance till ~70C; Nylon is horribly slow to print, requires heated chamber and filament dryer, more or less reasonable choice is Calibram BT.
I would suggest to use my software and cut bobbins from presspan with laser. Its cheaper variant, you can even impregnate finished transformers in the oven at 140C.
Attachments
Thanks a lot for your suggestion and excellent work! Your interlocking bobbins resemble classic ones that were made from 1 mm phenolic board. Anyway, I'll need to find a way to reliably fix the inner flanges of two or three chamber bobbins.
Best regards!
Best regards!
Use cyanoacrylate glue or non-acid construction silicone available in many shops. Removable spacers between inner walls (flanges) can fix them while glue settles up. BTW, you can 3D print clamps (just a brick with inner slots) which hold all walls/flanges parallel while glue dries.
Good and helpful suggestions! Anyway, I think spacers are more essential during the winding procedure to prevent the flanges from moving or warping.
Best regards!
Best regards!