1.72°/s fully insulated (right/left wall, rear wall and outside top and bottom of stove)
Results:
step 0.65 mm:
pitch 0.5 mm at the bottom and 0.4 mm at the top:
Making a mask for applying cream
For the mask you will need a brass plate 0,2 mm thick.
The author etched the plate like a regular board. He used ultraviolet light to "develop" and then etched as usual (an iron will work, I wonder?) (Meow! In principle, it will do - it all depends on the thickness of the conductors to be etched. Here and further approx. Cat.). Iron perchloride, hydrochloric acid, etc. were used for etching.
How to make a face mask with EAGLE.
Before making a mask, you can set the tolerance for SMD pads. To do this, select Tools->DRC->Masks, in the CREAM field, select a minimum of 0, a maximum of 10mil. In the % field, you can correct this value.
To export an SMD pad negative to EAGLE:
tCream layer activation.
1. File->CAM Processor
2. Select layer Dimensions and tCream
3. Select the PS_INVERTED option in Devices
4. Check that Scale is equal to 1.
5. File : filename.ps
6.Process Job
7. Your file filename.ps should now be in the project directory.
8. Install GSView or any other software to read .ps files
9. Open filename.ps and print it.
Developing and etching.
The brass plate is sensitive from 2 sides, but the author developed only one side so that the holes were trapezoidal. Such holes make it easier to separate the mask from the board. The protective film on the undeveloped side is perfectly preserved in acid.
1. Remove the protective film on one side
2. Bring out that side
3. Etch like a normal board
Applying cream
Align and fix the mask on the board.
Apply the cream with a strip of brass or other suitable tool. Try to keep the angle between the mask and the strip at 45°.
Remove the mask, try to remove it vertically. If the mask is slightly larger than the board, then you should have no problem removing it.
Set the components on the cream if they are not centered - it's okay, capillary effects during melting will align the components on their sites.
as a result, after the oven it turns out:
(LEDs soldered by hand)
Possible problems.
Spreading of the cream and short circuits of the legs of the components. Don't panic, use flux and a desoldering braid to remove excess tin. Next time reduce the tolerance in EAGLE so the holes are a little smaller.
The cream dries up and does not solder the components. Your oven heats up too slowly. Reduce drying time.
Author: Xelos (translation); Publication: radiokot.ru
See other articles Section Ham Radio Technologies.
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