[sdiy] Eurorack panels DIY

[Oren Leavitt]

On 1/31/2012 2:06 PM, Barry Klein wrote:
> Ok so I'm thinking that's engineering speak for "fagettaboutit" for the punch.
> Looking at specs of their lower cost shears I guess the same is said for them.
> So anyone have advice on getting aluminum cut to panel sizes?
> Typical costs?  Cheapest source for precut panels?
>
> Barry
>
>

Hi Barry,

For pre-cut panel blanks, I've ordered from OnlineMetals.com. Others 
have mentioned MetalSupermarkets.com too.

I usually get the 0.63" or 0.125" 6061-T6 alloy aluminum plate - very 
sturdy and easy to drill.
If I need - say a 1.75" W by 8.75" 1U MOTM sized panel - I put in 1.73" 
by 8.73" to give a little wiggle room for adjacent panels.

0.63"
http://www.onlinemetals.com/merchant.cfm?pid=1242&step=4&showunits=inches&id=76&top_cat=60

0.125"
http://www.onlinemetals.com/merchant.cfm?pid=1246&step=4&showunits=inches&id=76&top_cat=60

I have ordered quite a few panels from them and have been happy with it.

- Oren

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Andre Majorel
> Sent: Tuesday, January 31, 2012 12:36 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Eurorack panels DIY
>
> On 2012-01-30 17:49 +0000, Barry Klein wrote:
>
>> I didn't see any responses for suggestions for the hole punch and
>> whether or not the Harbor-Freight shear is sufficient for our
>> purposes.
>
> Shear area in mm² multiplied by shear strength in MPa gets you a force in N. For example, for a 10 mm round hole in 3 mm thick 2017A aluminium in T42 state,
>
>    10 * 3.14 * 3 * 390 = 36_738
>
> I.e. you would need a 3.7-ton punch.
>
> 390 MPa is towards the high end for aluminium alloys. Some alloys/states are less than half of that.
>
> --
> André Majorel http://www.teaser.fr/~amajorel/ _______________________________________________
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