The Offcial Machinist Thread: Revised 01/04/2014

Potatoes last one shot, so build reusable! Discuss ammo designs and ideas. Tough to find cannon part or questions? Ask here!
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 25798
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 111 times
Been thanked: 68 times

Donating Members

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.
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
sharpshooter11000
Specialist 2
Specialist 2
Posts: 247
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK

Sun Mar 18, 2012 4:32 am

May I ask where on earth you managed to get concentrated nitric acid? :shock:
User avatar
Crna Legija
First Sergeant 2
First Sergeant 2
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia

Sun Mar 18, 2012 4:33 am

his work
'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
sharpshooter11000
Specialist 2
Specialist 2
Posts: 247
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK

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!
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 25798
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 111 times
Been thanked: 68 times

Donating Members

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.
hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
sharpshooter11000
Specialist 2
Specialist 2
Posts: 247
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK

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
User avatar
Zeus
Staff Sergeant
Staff Sergeant
Posts: 1505
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt

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.
/sarcasm, /hyperbole
User avatar
sharpshooter11000
Specialist 2
Specialist 2
Posts: 247
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK

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
User avatar
Insomniac
Sergeant 3
Sergeant 3
Posts: 1297
Joined: Mon Dec 18, 2006 3:47 pm
Location: Australia

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.
I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
User avatar
sharpshooter11000
Specialist 2
Specialist 2
Posts: 247
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK

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.
User avatar
Zeus
Staff Sergeant
Staff Sergeant
Posts: 1505
Joined: Tue Oct 27, 2009 7:34 pm
Location: 'Straya, C*nt

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.
/sarcasm, /hyperbole
User avatar
inonickname
First Sergeant 4
First Sergeant 4
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am

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.
PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
Fnord
First Sergeant 2
First Sergeant 2
Posts: 2239
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Contact:

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.
Image
User avatar
sharpshooter11000
Specialist 2
Specialist 2
Posts: 247
Joined: Sat Aug 06, 2011 1:34 pm
Location: UK

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!
User avatar
ramses
Staff Sergeant 2
Staff Sergeant 2
Posts: 1679
Joined: Thu May 29, 2008 6:50 pm

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.
POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name :D
Post Reply