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Author Topic: How are THT resistors painted?  (Read 863 times)

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Offline fx991exTopic starter

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How are THT resistors painted?
« on: January 26, 2020, 02:39:58 pm »
Is anyone familiar with the process of painting a resistor? How do they apply the beige coating only to the resistor body without also painting the legs? I am sure they are not masking the legs and doing the dipping.

It would also be interesting to know how the color bands are painted on.

I have been looking for factory videos but unfortunately couldn't find any.
« Last Edit: January 26, 2020, 02:41:47 pm by fx991ex »
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Online tooki

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Re: How are THT resistors painted?
« Reply #1 on: January 26, 2020, 03:15:11 pm »
I have wondered the same thing, but never bothered to look into it. I’m curious as to the answer!
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Offline SeanB

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Re: How are THT resistors painted?
« Reply #2 on: January 26, 2020, 04:02:36 pm »
How about these, just a quick search away.



Basically you dip the resistor body in a pool of paint to get the full body coat, dry it with heat, and then to get the bands on you use washers running on the top of a bath of pigment to transfer the bands across to the resistor, dry again with heat and then tin the lead ends to finish the product.
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Offline German_EE

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Re: How are THT resistors painted?
« Reply #3 on: January 26, 2020, 04:10:24 pm »
You mean it's not done by nude virgins working by moonlight?

How disappointing!
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Online tooki

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Re: How are THT resistors painted?
« Reply #4 on: January 27, 2020, 05:38:46 am »
Quote from: SeanB on January 26, 2020, 04:02:36 pm
How about these, just a quick search away.



Basically you dip the resistor body in a pool of paint to get the full body coat, dry it with heat, and then to get the bands on you use washers running on the top of a bath of pigment to transfer the bands across to the resistor, dry again with heat and then tin the lead ends to finish the product.
That video doesn’t show anything. It answers literally none of the OP’s questions.
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Online dietert1

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Re: How are THT resistors painted?
« Reply #5 on: January 27, 2020, 09:11:49 am »
Maybe the resistors are kept rotating, which isn't easy to see in the video. This way a coating can be applied in a bath while keeping the wires clean. I'd guess making the color rings is by rotating the resistors, too.
We make small processor modules  with gold plated pins (something like hybrids that fit into DIL sockets) and coating is hand work still after 12 thousand pieces.

Regards, Dieter
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Online mariush

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Re: How are THT resistors painted?
« Reply #6 on: January 27, 2020, 10:24:16 am »
I imagined they're painted like when you're using a soldering fountain or like a chocolate fountain (pouring paint over the resistor which spins as it's moved under the paint "waterfall"
For all I know the bands can be made as if you drag a marker / felt tip pen over the surface as the resistor is rotated
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