Recent Posts

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21
New from Old / Re: Just a vase of flowers.
« Last post by WeldingRod on January 16, 2019, 12:18:57 PM »
My daughter's first weld was at 5 years.  It was really important that her little plastic bear got to watch, but it didn't need eye protection...  Weirdly enough, they sell ladies XXS tig gloves that FIT my daughter!  The biggest problem (from her side) was that the gloves looked too boring.  Markers fixed that ;-)

Sent from my SAMSUNG-SM-G891A using Tapatalk

22
New from Old / Re: Just a vase of flowers.
« Last post by RotarySMP on January 16, 2019, 11:07:08 AM »
O my god. How shocking. How irresponsible to expose a meer child to electricity, heat, UV, metallic fumes and heavy objects, not to mention dead cow hide and individual expression.

Shame on you.  Can't you see the poor little bugger grimacing in agony. Better get him back inside in front of a screen before his fragile psychy is scarred for life.

 :)

Mark
23
New from Old / Re: Just a vase of flowers.
« Last post by edward on January 16, 2019, 05:46:21 AM »
I'm 45-and-a-half and he can already weld better than me! Excellent stuff, kids need to learn this stuff young so they'll grow up practical people. My 8-year-old has just built a bike up from the frame with me for very similar reasons. He gets to ride the bike himself so he had better have done a proper job :)

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New from Old / Re: Just a vase of flowers.
« Last post by tom osselton on January 16, 2019, 12:52:46 AM »
Tell him good job! So is he thinking about a next project yet?
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New from Old / Re: Just a vase of flowers.
« Last post by SwarfnStuff on January 16, 2019, 12:40:54 AM »
Great to see a youngster doing stuff in the shed with Pa.   :clap:
Hope mum was impressed with her vase of flowers.
Wouldn't want to drop em on the feet but.

Did he get to paint them??
Regards,
John B
26
Project Logs / Re: PCB UV exposure box
« Last post by AdeV on January 15, 2019, 04:49:03 PM »
Tonight's episode: Amateur Hour in the PCB Factory!

Earlier today the tinning chemicals showed up. Since I happened (coincidence, honest) to be out of work early, I popped down to the workshop to have a play, as one does. I've bought enough tinning powder to make 500mls of solution, but since it only lasts 6 months when made up, I chose to only make 50ml. Weighed exactly 9g of powder into 50ml of near-boiling water, per the instructions; let it cool somewhat, then dunk the board in & watch some YouTube videos while I waited. After about 20 mins I took it out; it was tinned, but quite dull in colour.

It did polish up a little bit with some cloths, but I had to take it too far, didn't I? I very VERY lightly ran it across a sanding sponge I have, which promptly removed most of the tin... So, back in the bath for another couple of Marty's Matchbox Restoration videos (recommended if you like watching ancient tiny metal cars being resurrected from near-destruction back to better-than-factory), I removed it again and gave it the obligatory cold & hot shower, per the instructions. This time, I just buffed it as best I could with paper towels - it looks OK. Not as shiny as I'd like, I might give it a touch of a polish with some polishing compound, I think I got some with my dremel. I'll do that later.

Next job - carefully measure the X/Y offsets of the first pad from the edge of the board. Stick board to bed. Mount 0.6mm drill (so I get to keep more of the pad this time). Using the milled slot, carefully set the drill height so it doesn't drill any more holes in the plastic baseboard.... (duuuh). Then, one careless Y-move and  :zap: SNAP! Bye-bye 0.6mm drill.  :doh:

Undeterred, I used the 0.5mm drill anyway, results as per photo. I do have another 0.6mm drill somewhere, I think it's at home. If I can't find it, I think I'll re-drill the holes at 0.7mm, as the 0.5 looks a bit thin to take any component legs. Also, I'm not 100% sure I've drilled all the way through, and I don't want to move the board until I've made absolutely sure.

In the pic, I've stuck the board to a piece of scrap (a previous failed effort), using my aluminium fences to align it. It's not too bad, although the holes at the top of the board are slightly off-centre, probably because the board's not exactly square cut. Mea culpa, but that's what you get for having to cut all four sides by hand... I've had good results using a paper guillotine (the lever type) to cut circuit board, except it likes to move as you start the cut. In future, I'll probably stick the board to the cutter using double-sided tape, that way I should get a really good and dead-square cut. Not sure if it'll tear off the photoresist protective layer, though... some experimentation is required...

That's it for this week, I'll pick this up again on Saturday, which will hopefully involve finishing the re-drilling to the correct size, soldering the board up, and giving it a test run.
27
New from Old / Just a vase of flowers.
« Last post by one_rod on January 15, 2019, 04:41:11 PM »
A week before Christmas my eight year old nephew, Joshua said that he wanted to make a special present for  his mum.

He's done bits of stuff in my shop before, seems to really enjoy it and picks up practical skills very quickly.

Time to learn to weld, then.

Got him kitted out in suitable PPE...
20181208_141431 by Mick, on Flickr

20181208_141443 by Mick, on Flickr

Took about twenty minutes practice to get the basics of MIG technique down.
Then it was time to sort through the scrap pile for some suitable bits to work with.

All the welding is Josh's, I just provided a little "creative input".

20181208_141600 by Mick, on Flickr

20181208_141507 by Mick, on Flickr

Obviously the welds wouldn't pass nuclear inspection standards, but some of that stuff is tricky material to weld, and I wanted it all to be his own work, not just him standing there watching me do it.

So I'm calling it pretty good, for a first try. :thumbup:
28
Model Engineering / Re: Model steam boiler questions
« Last post by fcheslop on January 14, 2019, 05:54:10 PM »
Sandys design would come under book2 and the gas tank as per book3 of the 2018 code of practice
cheers
29
Model Engineering / Re: Model steam boiler questions
« Last post by chipenter on January 14, 2019, 05:33:42 PM »
30
Model Engineering / Re: Model steam boiler questions
« Last post by fcheslop on January 14, 2019, 05:10:16 PM »
Hi Chuck, this site has some of Sandys designs These are all to the UK code of practice or at least were at the time of designing
http://www.vapeuretmodelesavapeur.com/accueil/index.html
Most commercial coffee machine boiler are around 2.5mm thick Iv cut a few up for material as I worked on them for many years a good source of copper as most boilers fail due to heat exchanger end cap failure or element mounting Never had one fail on the copper parts
On the John Tom site the 2inch Clayton drawings are available it has a nice vertical boiler that would run a 1inch engine with spare capacity and is a good steamer
cheers
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