'LGT' Construction Diary

[Hezz]

Amazing work Shin,

You seem to be having fun and must be putting in some late nights modeling.

Here is a render I just did tonight in Inventor of a concept audio/video 3 way that I want to build. I already have the mid/bass and tweeter. Just need the 12 inch woofer. This is an unusual design using a Vifa 8 inch midbass instead of the usual 6.5 or 7 inch. The speakers are not exact replicas but are more for just visualizing the finished product.

Thanks to Sigurd for letting me barrow a few of his IGES files. It saves me a lot of time!!!

[ackcheng]

That makes the coreldraw picture looks like cartoon!

[Lindell]

Originally posted by ShinOBIWAN


Sweeeet

Very.....!

[Sigurd Ruschkow]

Originally posted by Hezz
Amazing work Shin,

Thanks to Sigurd for letting me barrow a few of his IGES files. It saves me a lot of time!!!

Hezz,
my pleasure




I'll try to add some nice Scanspeak Tweeter models during Easter.


Sigurd

[ShinOBIWAN]

Amps have arrived

[ackcheng]

look very nice. But do all the MOSFET have "class D" on them? This is not a class D amp, I believe?

[ShinOBIWAN]

They're branded 'class-d' lateral fet's from this company:

http://www.class-d.com/

Edit: Just noticed they're in Mansfield, which is about 20 minutes from me. Small world.

[wigginjs]

Too cool . Are you going to put them in the monster ATI chassis? How is that custom preamp from Twisted Pear coming along?

[ShinOBIWAN]

Originally posted by m0tion
Too cool . Are you going to put them in the monster ATI chassis? How is that custom preamp from Twisted Pear coming along?

They're going in different cases this time around and I think the pre-amp is dead, I've not heard from Russ for about 6 months. A shame because he'd already done the PCB work. I think the software side of things tripped him up because that's the point where he stopped working on it.

[sploo]

Originally posted by R-Carpenter
I imagine, you’d need a five axis CNC to cut this multi-angled insanity and 5-axis is yet quite expensive....

Originally posted by HYPERTUNE
Looks to me like all the parts could be made in a 3 axis machine.

I took the plunge on a hobbyist 3 axis machine at the back end of 2006. One of the first things I found was it's a lot more limited than you'd think.

You're both right in a way - it would be possible to cut the front face of those baffles with a 3 axis machine, but it would take a huge amount of time. A 5 axis machine would be better, but as R-Carpenter noted, they're just a bit pricey. I have looked into them, but some of the small 5 axis heads out there are as heavy as my whole machine .

I find the best way to think with the machine is to consider it a 2D 'shape' cutter, with the capability of doing flat bottomed rebates and channels. Trying to do curved/sloping faces is best done using other techniques - like Ant has done by using a mitre saw for his LGT baffles.

Originally posted by ShinOBIWAN
I realise the GPU does nothing when rendering but you've got to laugh when a GPU can produce 1-2 million frames in the same 8 hours it takes for a single photo realistic render...

It's been a few years since I really got involved in rendering work (my last real coding work was in the late 90s) but there is (or at least was) a huge difference between the way gaming rendering and raytracing works.

The gaming systems used z-buffer technology, with shadows approximated using z-buffer based shadows, and no way to do refraction.

Raytracing is much more complex; tracing the vectors of light through a scene, and taking into account complex diffusion, reflection and refraction.

I last worked on this stuff when diffuse reflection was just being approximated by radiosity (at least in the popular rendering field). I'd guess the methods being used today are way more complex!

As for waiting for long renders... a 486DX2/66 I had in the mid 90s took over a week to render a 640x480 image with loads of glass objects!

Originally posted by ShinOBIWAN

Sweeeet

Sweet indeed. That open sided render is superb. Nice work!