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custom heatsink machining

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#29
Well fellow machinists, it may indeed be hard for you to make any money here😉 The owner of those nice chassis' says:

cowanrg said:
well, for the materials AND labor, it was $150 each. not TOO bad considering. you gotta see them in person to tell. they are absolutely PERFECT. they were done to perfect tolerences. this is the front fins and the back plate with the hole in it.
Click to expand...

I guess it's not TOO bad indeed😉😉
 
#30
How about sourcing the heatsinks...and machining the rest of the cabs? For instance...use 2 or even 3 of the RTHETA sinks at $50 each, machine a sweet faceplate or back or whatever, top and bottom of course, and basically have the amps ready to go for say...aleph 2 monoblock or high power aleph x monoblock or something....certainly you'd be able to get the costs down...rather than machining it all out by hand. Can you imagine, if you could get the cost of the case down to $300 each, even w/ RTHETA sinks....I'd bet you'd have TONS of customers. I understand that $1500 each for the COWANRG cases....but thats w/ custom machining of the sinks...custom machine just the faceplate maybe and maybe not so close to the PASS stuff, but cool nonetheless, and you'd be able to keep costs down and make a huge huge run of cases.

-Matthew K. Olson
 
#31
I believe you also read that the front plates were a big favour from a friend 🙂
Everything made in the garage, and the materials were surplus.

Both you and i know that surplus is not an option for custom orders....wish it was.

Making the inductors you see above was for free....but i guess nobody intends to seel them for that 😉

Magura
 
#35
Mattyo5 said:
I understand that $1500 each for the COWANRG cases....but thats w/ custom machining of the sinks...custom machine just the faceplate maybe and maybe not so close to the PASS stuff, but cool nonetheless, and you'd be able to keep costs down and make a huge huge run of cases.

-Matthew K. Olson
Click to expand...


The sinks are standard extruded profiles.

It is not possible to make anything that even looks like a case for 300$.....as already stated in this thread.

Just the faceplate of the pass lokkalikes will set you back 300$ in reasonable numbers.

Magura
 
#37
I agree with that.

Here's an example of the simplest chassis one can make using R-Theta heatsinks I posted earlier. I used 1/4 aluminum plates for everuthing and 4 screws per panel. There are two 3/4 x 1.5" bars per each sink (used also for TO-3 devices attachment) and four 4" stand offs, that's all to keep everything together. This chassis is good for Aleph 2, but I couldn't offer it for $300.😉
 

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#38
Yes yes I understand that $300+ for those sweet faceplates. What I'm saying is maybe most of the people on the board don't want to go that far. Perhaps it would be nice have have less machining ...rather ...less complicated machining and more ease of case building. For instance, there is a guy on ebay that sells CUT aluminum 6061 that is pretty darn accurate for $3.00/lb or so. Really all we need then is for the holes to be drilled and tapped, or just drilled whatever, ie a case kit. Maybe w/ RTHETA sinks and nice aluminum all around. Minimal machining, and might actually help many people build cases, since case building is the most difficult. Forgive me if I'm missing the point. Maybe Jason just wants to get some sweet jobs because he likes machining complicated things and would rather do 1 order than 200. But if he wants to do almost assembly line machine work...I'll bet there are quite a few guys that'd pay for a case kit that'd satisfy and aleph 2 monoblock. Am I missing the point?

-Matthew K. Olson
 
#39
Ok peter, you were ahead of me 🙂 I can't type that fast :-D

but yes those are EXACTLY what I was talking about...surely the price would be below $1500 for something like that though...I'll bet it'd be well below $500 for drilling and tapping a few holes, especially if it was a run of 100 pieces. am I wrong?


-Matthew K. Olson
 
#40
Now, to simplify building my chassis, one can use 6" x 1/4" aluminum bars, so they have to be cut to length only and finished on belt sander (forget milling). Drilling 4 holes per panel is not a problem either. So why would you need machinists to do this kind of work? All you need are basic tools anybody can get for less than $100 ea.😉
http://www.diyaudio.com/forums/showthread.php?s=&postid=28092#post28092

Now I use a table saw to speed up and improve my cutting. Two runs (first rough and second finishing) give similar results to milling.😉
 
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