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11
Project Logs / Re: PCB UV exposure box
« Last post by AdeV on January 18, 2019, 01:51:57 PM »
It's my doorbell!

I think I'm excused for forgetting - it was September 2017 you started on this project!

Totally excused... I thought the forum must have it's years wrong at first... 15 months since I figured it'd "only take a weekend". Oops!

I wonder how many visitors I've missed....?  :scratch:  :lol:
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Metal Stuff / Re: Sinker EDM question
« Last post by Alphawolf45 on January 18, 2019, 01:49:25 PM »
 Yeah ,before I had chemo therapy screw with my head I was maybe  half as bright as Awemawson.. Now I need an extra heaping of  help.. :doh:
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Metal Stuff / Re: Sinker EDM question
« Last post by seadog on January 18, 2019, 01:31:47 PM »
awemawson is your man. He has a working EDM. I'm sure he'll be along soon.
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Metal Stuff / Sinker EDM question
« Last post by Alphawolf45 on January 18, 2019, 01:15:29 PM »
 I finally got my sinker edm running again. I had only operated it once last year when I first got it so I don't really know how to use it or exactly what I should expect from it. It's primary malfunctions is just the idiot that is trying to run it without consulting the operators manual...

    It is capable of 50 amps output but I am running it at 10 amps so that I don't pop the fuse , my 5hp rotary phase converter cant supply enough juice to it to run at 50 amps - I may get 20 amps if I push it......Irregardless . At 10 amps using a 1/2" square graphite electrode I am only burning .001 depth per minute in a steel workpiece.. Does that sound right.?? That my friends is slower than slow..


  Also, an 85 yr old still working tool and diemaker friend of mine talks about arcing going on that damages the workpiece and the electrode... What is that and how do you recognize it? I can call him but he is real hard of hearing, doesn't hear his own phone ringing unless he is near it. Photo shows my EDM today with most of it's covers pulled.. I like it a lot but I am afraid the beastie don't much like me.
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Project Logs / Re: PCB UV exposure box
« Last post by philf on January 18, 2019, 09:00:46 AM »
It's my doorbell!

I think I'm excused for forgetting - it was September 2017 you started on this project!
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Project Logs / Re: PCB UV exposure box
« Last post by AdeV on January 17, 2019, 06:06:42 PM »
It's my doorbell!

https://madmodder.net/index.php/topic,12284.msg146395.html#msg146395

I couldn't make the stripboard version small enough, whilst having the sideways pointing LEDs. Even now I've had to go for the 3mm versions... not yet sure my blue ones are bright enough, I may need a smaller resistor. I don't mind overdriving the blue one a bit, as it's only on as the bell is actually ringing.

I'm also not sure what effect having the computer bits outside the door (in the switch box) will do. They may fail due to environmental issues; but equally, I wasn't sure if the capacitive sensor would work at the end of a long run of cable. Worst case scenario, I'll compromise and have the switch/LEDs outside, a small box inside with the chip, and the long wire running back to the bell box.

I'll post a writeup on the doorbell once I've got the box sorted, unless I get a flood of PMs' saying "for god's sake nooo!"  :scratch:
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Project Logs / Re: PCB UV exposure box
« Last post by WeldingRod on January 17, 2019, 05:02:08 PM »
It's an optocoupler, right?

Sent from my SAMSUNG-SM-G891A using Tapatalk

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Project Logs / Re: PCB UV exposure box
« Last post by philf on January 17, 2019, 04:16:04 PM »
So Ade,

Now you've built it, what does it do?
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Project Logs / Re: PCB UV exposure box
« Last post by AdeV on January 17, 2019, 03:53:44 PM »
So... thanks to Merseyrail (for abandoning me at Hamilton Square, 50 minutes walk from home, no taxis to be seen...), and my mate Ted who sublets part of my workshop... I ended up back here  :D

Further, thanks to Amazon, who delivered a nice new box of 50x PCB drills... so I recommenced drilling with the 0.6mm bit  :headbang:

A little later, upon discovering that even 0.6mm is a real squeeze for some of those component legs, I opened them even further to 0.7mm. Which I could have drilled with my original set.  :palm:

Aaaanyhow. A little later, with a little help from some 50+ year old Fry's rosin flux, it's complete. And, even better, IT WORKS!!! Photos show back,side,  front side, and front size powered up... which isn't terribly exciting I know, but hey!

Hmm, a wave soldering machine would have made it MUCH easier to solder  :lol:

The End......



... or is it?  :palm:  :loco:
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New from Old / Re: Just a vase of flowers.
« Last post by PekkaNF on January 16, 2019, 03:35:58 PM »
You guys should have seen the baffled hardware clerk when my daugter was checking the resiprators and he came to ask "May I help you?" and she said that you have very limited choise in PPE for children.

Pekka
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