stainless steel for enclosure - diyAudio
Go Back   Home > Forums > Design & Build > Construction Tips

Construction Tips Construction techniques and tips

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st October 2010, 11:58 AM   #1
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
Default stainless steel for enclosure

Hi

I like designing my own enclosures for the amplifiers I build.

So far i have stuck to natural anodized alu which gives a nice offset to the standard black anodized heatsinks.

obviously getting one or two units cut , bent and anodized is costly. and by FAR the most expensive part is the anodizing.

I suppose bare brushed alu is an option but my feeling is that it will scratch too easy.
Not a Huge fan of powdercoating though you do get a clear powdercoating that will look good on brushed aluminium.

So here is my question.

I am currently designing two new enclosures. One for a big class A amp and one for a tube preamplifier.

and want to try and cheap out and not go the anodizing route and try bare brushed Stainless steel. The place that cut the metal and bend says they have a 200 per cm brush which is nice and fine.

MY Question is.

For a brushed Stainless steel enclosure is 430 steel fine or should I opt for the 304 grade?
Attached Images
File Type: jpg IMG_7074 [1024x768].JPG (122.7 KB, 526 views)
  Reply With Quote
Old 1st October 2010, 12:01 PM   #2
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
more images
Attached Images
File Type: jpg n607902362_478215_6537.jpg (44.4 KB, 514 views)
File Type: jpg n607902362_674391_346.jpg (37.3 KB, 504 views)
  Reply With Quote
Old 28th October 2010, 06:41 AM   #3
diyAudio Member
 
tangmonster's Avatar
 
Join Date: Jul 2007
Location: Cape Town
IN the end i gave brushed 430 a bash to see how it came out. I sent my drawings through and picked up the bent and punched metal yesterday.

And I am very happy.
It seems like the metal place mostly only stock 1.6mm and not 2 or 3 mm so it won't work if i need stronger enclosure but it looks GREAT!
Attached Images
File Type: jpg IMG_7081 [640x480].JPG (59.5 KB, 436 views)
File Type: jpg IMG_7085 [640x480].JPG (66.1 KB, 417 views)
File Type: jpg IMG_7084 [640x480].JPG (58.8 KB, 217 views)
  Reply With Quote
Old 28th October 2010, 11:37 PM   #4
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Looks very good. Yet I have never used stainless steel for home builds. It too hard for me to cut, drill, or punch; by hand.

I have a very good sheet metal machine; 3 in 1 unit. But cutting stainless on it, is asking a bit much. Alu, is no problem. I do brushed or polish Alu., or I will paint it.

But your items look very good.

Take Care


Ivey
__________________
"Have anyone seen my Smart Phone"?
  Reply With Quote
Old 29th October 2010, 12:11 PM   #5
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Default working stainless

I've worked a lot of stainless NEMA 12 chassis in a food plant. You don't cut it with any normal shear, nor does plasma cutter make any kind of straight edge. You cut it oversize with a 4.5" angle grinder, then smooth the edge with the worn down 1/4" thick wheel. (Made some safety sign backings out of SS sheet, aluminum backing will dissolve in the caustic washdown process). You drill Stainless with cobalt coated drills. These are more expensive than HighSpeedSteel drills, but he toughness of HS drills has dropped so low at my local discount stores and hardware, that I buy cobalt anyway, or mail order HS from Cleveland. You punch Stainless with Greenlee punches- wears out punch very fast. Hydraulic punch driver is very useful.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 30th October 2010, 09:34 AM   #6
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Kilns:

My spouse was really into ceramics. She wanted a Kiln and I wanted a new Collins Radio. So I built a kiln. It cost me $300.00 verses $1,230.00 in 1976 dollars.

I used stainless steel, boiler bricks, boiler backing, home made steel clamps, Tappen Over heater elements and monel 1/4" rods.

I had the stainless cut into strips wide enough to where, when bended into a U shape. The Boiler bricks would fit inside. Once I got it high enough (about) 28", 30" over all in height. It was 18" square inside. Just perfect for a Tappen Oven heater loop element. I had obtain 9 of these. 8 from the junk and one that I had to purchase new.

I space them out evenly inside the kiln, and attached them on hangers to the stainless steel. Then I used 1/2" stainless steel strips to form buss bars for the ends of the heater elements. I bent the end tips of the heater elements in an L shape, drilled holes in the stainless steel and inserted and tied the element to the buss strips, using stainless steel wire. I used the monel rods to connect to the stainless steel buss strips and connected a stove cable to the rods.

You have to heat and hammer the rods ends flat first, drill a hole through them to attach them to the buss strips.

I wrap the boiler backing board completely around the outside of the kiln, then bend and wrap stainless steel around the boiler backing board. Lock it in place with "bandit steel", then use the 8 home made clamps to hold it all together.

The kiln was 18" square inside and 28" of useful height. So that my spouse could do medium size pieces.

My spouse became the pride of the ceramic class and we became the electric company's best customer.

The kiln was good for 2,330 degrees f. The stainless steel was good up to 3,370 degrees f. It turned a beautiful gun barrel blue, the stainless steel that was inside the kiln.

Take Care


Ivey
__________________
"Have anyone seen my Smart Phone"?
  Reply With Quote
Old 30th October 2010, 11:53 AM   #7
audi0 is offline audi0  Australia
Account disabled at member's request
 
Join Date: May 2009
Location: 37.34 degrees South
Blog Entries: 5
Stainless steel makes a nice enclosure.
As noted by other members, of course it's a bit more difficult to work with compared to aluminium alloys.
For this application, as corrosion isn't an issue, either grade would be acceptable, although the 430 grade does fold and fabricate a little easier that the 304, no need to go to a higher chromium content 316 grade
  Reply With Quote
Old 30th October 2010, 05:09 PM   #8
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Quote:
Originally Posted by tangmonster View Post
IN the end i gave brushed 430 a bash to see how it came out. I sent my drawings through and picked up the bent and punched metal yesterday.

And I am very happy.
It seems like the metal place mostly only stock 1.6mm and not 2 or 3 mm so it won't work if i need stronger enclosure but it looks GREAT!
Hello,
I have worked with SS for many years in industrial and food processing applications. The saying that something is easy if you know how only applies to a limited degree to working SS. SS will eat your tools for breakfast.
300 series SS is 18% chrome and 8% nickel plus and minus a little other stuff like molybdenum. The other 70 or so % is iron.
An interesting thing between the 300 and 400 series SS is that the 300 series does not have a ferromagnetic grain structure. A magnet will not attract 300 series SS.
I have been puzzled about the magnetic shielding ability of aluminum vs. steel chassis and Mu metal. Not enough to study it. SS may have some differing shielding properties. Anybody Know?
DT
All just for fun!
  Reply With Quote
Old 30th October 2010, 05:24 PM   #9
diyAudio Member
 
Join Date: Nov 2009
Location: Birmingham, UK
The thing when working with stainless steel is that, like titanium, it work hardens.
That is the more you are trying to bend, shear, grind or drill it, the harder it gets and the more it will resist whatever you are doing to it.
Which is why nobody makes stainless steel cars: The press tools wear out ten times faster than when using mild steel. And the press tools are some of the costliest aspects of manufacture.
Doesn't weld that easily either although no worse than aluminium…
  Reply With Quote
Old 30th October 2010, 05:27 PM   #10
Ivey is offline Ivey  United States
diyAudio Member
 
Ivey's Avatar
 
Join Date: Jan 2010
Location: Ann Abor, Michigan
Default Shielding? As to what.

Radiation, will go through SS, like butter to a hot knife. Magnet Radiation is even worse. Just increase the flux. The lack of dense iron element atoms is the reason. Nothing there to keep it busy.

300 lacks iron, so when it is heated, there is no scaling. 400 is something I have to look into. To if it is do able for me. But sometimes I just can not get my hands on things unless I purchase it over the internet. I hate purchasing things sight unseen or just by a picture over the internet. I fear that they are only showing me the good side of things.

Take Care


Ivey
__________________
"Have anyone seen my Smart Phone"?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Building in Stainless steel and timber! pheonix358 Multi-Way 25 9th December 2009 02:01 AM
Custom Stainless steel speaker terminal plates amit uk Swap Meet 0 17th January 2007 03:45 PM
Stainless Steel Death of Zen pre amp DocLorren Solid State 10 29th October 2006 07:31 PM
Jordan JX92S full range drivers in stainless steel enclosures JohnnyBoy Swap Meet 19 2nd May 2006 04:40 AM
working with stainless steel jteef Everything Else 10 5th October 2002 06:02 AM


New To Site? Need Help?

All times are GMT. The time now is 04:14 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2