Coil spacers (and other 3D printed bits and pieces).

VK3ZYZ

Moderator
Staff member
I found these on Thingiverse and thought that could be a good thing to print if one wants to make a coil.
They are strips that are to be glued onto a PVC tube to wind the coil onto.
CoilSpacers.png
 

BillC

Active member
Wonder what is the pitch? They might make good gear rack for model work. Also if used in coil winding we would have to decide on the pitch of the coil and divide the pitch by the number of spaces around the former and then use that number as an addative increment to advance each bar around the circle . Just a thought, would that work Denys ?
 

VK3ZYZ

Moderator
Staff member
Another 3D print project under way is a 24 position high power (I hope) rotary switch.
This is something I have drawn from scratch, and is a work in progress, not even fully designed as yet.

This side will bolt to the front panel of the case and have brass M4 screws holding solder lugs.
24PosRotSw1.jpg


And this side will use M4 brass dome nuts as the contacts.
The 4 hex holes in the center will connect to the slip ring of the wiper and each outer one will have the solder tabs on the other side.
24PosRotSw2.jpg

The wiper etc is still to be worked out fully and drawn.

The hope is to use this in an antenna tuner amongst other things.
 

BillC

Active member
That will make a great switch for a tapped loading coil , lot simpler than a roller inductor. I made a 30 position switch at one time, low power, I used copper clad board and 1/8" brass bolts for contacts and other bits and pcs. of brass rod and threaded bushing etc it all seemed to work well. If you need a hand with any metal work, if i can help let me know , good luck.
 

VK3ZYZ

Moderator
Staff member
Thanks Bill. I may take you up on that later.
The one above was "designed" for M4 but the holes did not print accurately. M3 will be ok!
Mr Google to the rescue!
The latest version I have of Cura (the slicer program for the 3D printer) has a setting to calibrate the holes.

Cura4.6.1_HoleCalibrate.png


So after printing a few 30x50mm test pieces with holes of 25, 10 and 3mm, then selecting the best setting, the holes are now correct.
CalibrationTests.jpg
 

VK3ZYZ

Moderator
Staff member
M4DomeNuts.jpg

The M4 dome nuts have just arrived and fit nicely :)
I'm not sure when work on this will continue.
 
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