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Unread postAuthor: Zeus » Thu Sep 27, 2012 7:41 pm

Completely off topic, if I use an angle grinder to cut some spring steel, will that cause excessive tempering? It's a car leaf spring.
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Unread postAuthor: ramses » Thu Sep 27, 2012 9:26 pm

Zeus wrote:Completely off topic, if I use an angle grinder to cut some spring steel, will that cause excessive tempering? It's a car leaf spring.


This is the off topic thread after all. I would wrap the end of the spring you want tempered in a wet rag or paper towel, just to be safe.

With regard to the oxygen, if he used a concentrator, the machine would be expelling ~4x the amount of O2 as almost pure N2. So for the whole room, the oxygen concentration wouldn't' change (theoretically). There would be a slightly higher concentration around him, and slightly lower around the outlet of the machine. I think this would be fine, especially at 2L/min

With bottled O2 (or liquid O2), you are actually adding oxygen to the system (rather than concentrating it), so you could actually have a higher than normal concentration of O2 in the room. This means it could actually build up and create a hazard.
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Unread postAuthor: Labtecpower » Thu Sep 27, 2012 11:12 pm

Completely off topic, if I use an angle grinder to cut some spring steel, will that cause excessive tempering? It's a car leaf spring.


Nope, just make sure it doesn't get too hot.
This can be achieved by wrapping some wet rags around the workiece at area's that shouldn't be heated.
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Unread postAuthor: Zeus » Thu Sep 27, 2012 11:44 pm

Excellent, I'll just be doing small cuts with long breaks. Mainly because my grinder is crap, and had difficulty cutting some 22mm steel tube with 4mm walls. I take it the same applies to using a bench grinder?
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 27, 2012 11:47 pm

Labtecpower wrote:This can be achieved by wrapping some wet rags around the workiece at area's that shouldn't be heated.


... or dipping the thing in a bucket for monsieur :)

Warhead, I expect to see some atmospheric pressure hybrids from you now.

Image

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This is what happens when a VERY HOT flame is held against aluminum for a long time! It looks like a cutting torch has been used on this gun from the inside out. This is how the Korean PCP looked after it caught fire and burned from using pure oxygen as a propellant. Yes, the stolen oxygen was cheap until this happened.

Note the discoloration of the anodizing. Forensic scientists use clues like this and the bending of the steel barrel to determine how much heat caused the damage and how long the fire lasted. An oxygen fire is a dangerous thing. This rifle was returned to Pyramyd Air as defective by a person who had been warned not to do this.
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Unread postAuthor: Labtecpower » Fri Sep 28, 2012 12:02 am

Did monsieur Creosote swallow pressurized pure oxygen by any chance? :D

If the workpiece is very small, a bucket is more practical. If it is larger however, i'd say it's bettter to prevent it from getting hot in the first place :)
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Unread postAuthor: Zeus » Fri Sep 28, 2012 12:13 am

Perfect segue.

Considering it's a crossbow prod, I'll be using rags and small cuts.

Jack, when I first saw that film when I was 4, that scene made me dry retch. I'm more a fan of the Flying Circus and and And now for something completely different.
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Unread postAuthor: inonickname » Fri Sep 28, 2012 12:20 am

Be careful with the rags near the grinder. Also make sure you're using thin cutting disks (1.5mm or so) as they don't produce harmful shards if forced/loaded too heavily. The dust isn't nice, but it's better. Had a workmate have one of the thicker disks explode while cutting and slash his neck.

IMO avoid the thick cutting disks completely, I have one and I only use it for making thin grooves that can't be done by file/saw/whatever
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Unread postAuthor: Zeus » Fri Sep 28, 2012 12:26 am

I only ever use the thin discs, and I'll cool the steel down, pull off the rags, cut 3" or so, chuck the rags back on.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 28, 2012 2:43 am

Zeus wrote:Perfect segue.


I have a circle of friends where one cannot mention "bucket" without adding "for monsieur". Objects lacking girth are also invariably describes as being "wafer-thin" in a French accent.
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Unread postAuthor: MrCrowley » Fri Sep 28, 2012 2:49 am

jackssmirkingrevenge wrote:I have a circle of friends where one cannot mention "bucket" without adding "for monsieur". Objects lacking girth are also invariably describes as being "wafer-thin" in a French accent.

Wish I had more cultured friends like that :D

There's not much I don't like in that film.


Edit: Anyone here watch Louie? The last three or four episodes have been some of my favourite in the entire series. The finale was awesome too.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 28, 2012 3:52 am

MrCrowley wrote:Wish I had more cultured friends like that :D


MrC's potential cultured friends wrote:yeeeeeeeeeeeeeeeee yeeeeeeeeeeeeee wayfaire thien mate yeeeeeeeeeeee


I don't see why you could possibly want that :D
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Unread postAuthor: POLAND_SPUD » Fri Sep 28, 2012 3:04 pm

pui
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Unread postAuthor: Technician1002 » Fri Sep 28, 2012 5:30 pm

I was reviewing all my photos of the recent trip and noticed when I took this picture of the guy in the tan hat ahead of us on the trial, i managed to get my toes in the picture. There are not too many who take shortcuts on the switchbacks here.
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My feet in the Grand Canyon on the trail.
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Cropped the picture to highlight the hiker.
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Unread postAuthor: Fnord » Fri Sep 28, 2012 8:08 pm

(^But he managed to keep his Hoveround just out of frame)




:D
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