1/8" Aluminum for top plate? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 8th January 2005, 12:27 AM   #1
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Question 1/8" Aluminum for top plate?

I'm almost finished gather materials for my SE KT88 monobloc project and am now deciding on the chassis. My plan is to mount everything on aluminum sheet and place that sheet on a base.

It appears that the aluminum sheet will have to be about 11x12" minimum for the layout I've (mostly) decided on.

Would .090" sheet be thick enough or would I be better off going with .125"?
__________________
--Sherman
  Reply With Quote
Old 8th January 2005, 02:06 AM   #2
diyAudio Member
 
Tom Bavis's Avatar
 
Join Date: Jun 2002
Location: Macedon NY
I think either would require bracing - add an aluminum angle or channel underneath that catches at least some of the mounting screws of the transformers.
  Reply With Quote
Old 8th January 2005, 02:33 AM   #3
diyAudio Member
 
Join Date: Jul 2003
Location: Blackstone VA
I have used .125" Aluminum for a 12x13 plate on my Dyna 70 Clone without bracing and had no problem with sagging but the tube sockets come very close to being flush with the plate which made me uneasy, although I have never had any shorting problems.

I would suggest something like .1". How heavy are your trannys?

Pete
  Reply With Quote
Old 8th January 2005, 03:09 AM   #4
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
there's a EBay seller who specializes in aluminum -- it's in the Industrial/Metalworking section -- very good prices --

in Chicago you should be able to find this stuff very inexpensively -- if you want to visit a scrapyard.
  Reply With Quote
Old 8th January 2005, 08:19 AM   #5
diyAudio Member
 
purplepeople's Avatar
 
Join Date: Mar 2003
Location: London, Ontario, Canada
When strength is a concern and motion is not, there is no doubt that bigger is better.

Do you know the alloy? It might be strong enough in the thinner gauge sheet. Since aluminum comes in dozens of alloys, each with it's own structural characteristics, the thickness of the material cannot indicate how strong or rigid it is.

:)ensen.
__________________
Those who claim to be making history are often the same ones repeating it.
  Reply With Quote
Old 8th January 2005, 01:12 PM   #6
markp is offline markp  United States
diyAudio Member
 
Join Date: Oct 2003
Location: L.A., CA
A piece of T6061 aluminum 1/8" thick that size will support the weight of a man. Find a metal dealer in your area and go look at his scraps to find a good plate. It is about 1/3 the price of having them cut you a new sheet. If it is not the right size it is still cheaper to have them cut it for you. If you have a table saw with a carbide blade you can cut it yourself(yes you can cut aluminum on a table saw).
__________________
If it sounds good... it is good!
  Reply With Quote
Old 8th January 2005, 02:12 PM   #7
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
I have used 1/8" 5052-H32 (much cheaper than 6061) and I had to use a 2-ton hydraulic jack to bend it into a chassis. Heh, I had clamped 4" of it and was standing (and hopping) on the remaining 8" and it would not bend. And I'm 250 LBs!
  Reply With Quote
Old 8th January 2005, 02:27 PM   #8
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally posted by markp
If you have a table saw with a carbide blade you can cut it yourself(yes you can cut aluminum on a table saw).

Wear ear protectors !

I am in the process of building a modular chasis -- the idea comes from taking apart various HP and Krohn-Hite equipment -- as I have a little milling machine it should be very easy to use 0.093 aluminum sheet for the sides, top and bottom, sliding these into the milled rails:

Click the image to open in full size.
[p]
Click the image to open in full size.
  Reply With Quote
Old 8th January 2005, 02:49 PM   #9
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Quote:
Originally posted by markp
A piece of T6061 aluminum 1/8" thick that size will support the weight of a man...
The sheet I'm looking at is in fact 6061 alloy. I can have it cut to the size I need for no charge but I'm thinking of also getting a larger sheet to have available for future projects so knowing I can cut it with a table saw is nice.

I will get the 1/8" today! (Now I just have to break down and order the iron. Still waffling between Hammond and James OPTs.)
__________________
--Sherman
  Reply With Quote
Old 8th January 2005, 03:27 PM   #10
diyAudio Member
 
rcavictim's Avatar
 
Join Date: Jun 2004
Location: Next to an open wormhole NW of Toronto
Must add to what Jackinnj said about ear protection. Wear EYE PROTECTION!!!

If you are careful a hand held power saw with a carbide blade can also do a good job on thick aluminum sheet. It is almost amazing how good one can cut 1/2" thick aluminum plate this way.

BTW, I suggest you mill the tube socket holes. This 1/8" aluminum in the harder alloys is very hard on the bolt in draw punches. If you must use a draw punch, use plenty of oil on the bolt threads and also the cutting surfaces of the punch.
__________________
"There are more worlds than the one you can hold in your hand." Albert Hosteen, Navajo spiritual elder and code-breaker, X-Files TV Series.
  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
FS: very nice RAAL "FlatFoil" ribbon tweeters {NIB }, with custom made front plate yairf Swap Meet 3 2nd June 2009 09:25 AM
Seas 5" Aluminum MMadrid Multi-Way 10 30th June 2006 08:40 AM
Diamond plate aluminum raintalk Subwoofers 15 2nd November 2005 04:57 AM
Effect of cross-coupled "local" FB on plate load of previous stage ray_moth Tubes / Valves 23 27th April 2005 08:55 AM


New To Site? Need Help?

All times are GMT. The time now is 01:06 AM.


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