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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 17, 2012 11:34 pm

sharpshooter11000 wrote:How did you do the side engraving? Acid?


Yup, masked the highlights with masking tape and added dropwise about 5mL total concentrated nitric acid on it.
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Unread postAuthor: sharpshooter11000 » Sun Mar 18, 2012 4:32 am

May I ask where on earth you managed to get concentrated nitric acid? :shock:
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Unread postAuthor: Crna Legija » Sun Mar 18, 2012 4:33 am

his work
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Unread postAuthor: sharpshooter11000 » Sun Mar 18, 2012 4:49 am

Lucky! I wonder what my chemistry teacher would say if I asked for some :lol:

Also, does the masking tape stay intact? I would have thought if nitric acid is strong enough to go through metal it would definitely go through masking tape!
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Unread postAuthor: jackssmirkingrevenge » Sun Mar 18, 2012 4:53 am

One of the benefits of managing a lab ;)

You can get similar results with hydrochloric acid which you can usually get reasonably concentrated from a hardware store, you just have to leave it for longer.
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Unread postAuthor: sharpshooter11000 » Sun Mar 18, 2012 5:19 am

Unfortunately B&Q don't seem to stock it where I live :(

Here's something I thought you might be interested in
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Unread postAuthor: Zeus » Sun Mar 18, 2012 5:39 am

JSR, stop reminding me that it'll be around 10 months before I'm working in a lab.

Another method (which I can't be arsed finding a link for) uses electrolysis to remove material (not EDM). If you use nail polish or model paint, remove what you want etched, and electrolyse in a solution of (NaOH sound ok JSR, I haven't tried it. NaCl would spew off Cl2 and scare people away).

Should work well, experiment first.
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/sarcasm, /hyperbole
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Unread postAuthor: sharpshooter11000 » Sun Mar 18, 2012 5:48 am

Am I right in thinking NaOH is drain cleaner?

Zeus wrote:NaCl would spew off Cl2 and scare people away


Ironic (is that the right word?) considering your sig :D
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Unread postAuthor: Insomniac » Sun Mar 18, 2012 5:55 am

Yes, all drain cleaners I've ever seen are NaOH. Some oven cleaners are as well, though there are 'non-caustic' types which do not contain it.
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Unread postAuthor: sharpshooter11000 » Sun Mar 18, 2012 6:03 am

Thanks Insomniac

Back on topic, would it be possible to use a tool for facing as a makeshift boring bar? I'm making a nylon washer and don't have a big enough drill bit for the hole in the middle.
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Unread postAuthor: Zeus » Sun Mar 18, 2012 6:22 am

sharpshooter11000 wrote:
Zeus wrote:NaCl would spew off Cl2 and scare people away


Ironic (is that the right word?) considering your sig :D


Ironic is right, as I said, Cl2 scares people away, I've come to enjoy the smell in small quantities.

Most drain cleaners are indeed NaOH, sodium hydroxide. Red Devil lye is quite common in the US if I recall correctly.
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Unread postAuthor: inonickname » Sun Mar 18, 2012 9:42 pm

Insomniac wrote:Yes, all drain cleaners I've ever seen are NaOH. Some oven cleaners are as well, though there are 'non-caustic' types which do not contain it.


In addition to NaOH and the "non caustic" varieties there's also sulfuric acid, sodium hypochlorite and KOH :wink:

If you want an even more potent etchant try a mix of 1:3 nitric/hydrochloric acid.

And no, buy/make a boring bar. If it was a boring bar it'd be called a boring bar, not a facing tool.
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Unread postAuthor: Fnord » Mon Mar 19, 2012 5:02 pm

Back on topic, would it be possible to use a tool for facing as a makeshift boring bar? I'm making a nylon washer and don't have a big enough drill bit for the hole in the middle.


Just get a cylinder of metal the size of the hole and heat it up with a torch/ punch it through. If not use a dremel/soldering iron.

Also I really like your shell jsr.
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Unread postAuthor: sharpshooter11000 » Mon Mar 19, 2012 5:35 pm

Ah, thanks Fnord, that's a great idea!
Inonickname, it's doing pretty much the same job, just facing on the inside :wink:
I'll probably end up buying one anyway, they're just pretty expensive for what they are!
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Unread postAuthor: ramses » Mon Mar 19, 2012 7:57 pm

Fnord wrote:
Back on topic, would it be possible to use a tool for facing as a makeshift boring bar? I'm making a nylon washer and don't have a big enough drill bit for the hole in the middle.


Just get a cylinder of metal the size of the hole and heat it up with a torch/ punch it through. If not use a dremel/soldering iron.

Also I really like your shell jsr.


Tube might be more effective.
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