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Old 27th November 2010, 05:59 AM   #571
diyAudio Member
 
Join Date: Jan 2009
Location: Bombay [aka Mumbai]
In this pic that you posted, the edges of the fins seem quite sloppily cut. Is that an optical illusion? If not, were they milled [is that the correct term to use?] later?

Click the image to open in full size.
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Old 27th November 2010, 06:43 AM   #572
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Join Date: Jun 2007
Location: Mumbai/Delhi - India
The one that is ten inches wide looks super! Sangram 3k was for how many inches (length) of the extrusion? i would love to get my hands on these.
what i have realized is that because of our (generally) warmer climate we really need to over engineer the cooling on class A amps. the general practice of a 25 deg. C rise over ambient would put my heatsinks at 65 degrees in summer!
cheers,
mymindinside
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Old 27th November 2010, 07:52 AM   #573
magma is offline magma  India
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Join Date: Jun 2009
@keith
the edges are not how they seem
i took the pic and the camera cautioned that the pic was blurred

the edges have not been milled
The correct way of cutting (aluminium such as this) is with a 2-2.5mm Steel circular saw to get a smooth cut
These edges were however cut with a 5mm saw with inserts and was then filed which caused minor waviness ( but not roughness as the pic leads you to belive)

it is due to this waviness and the shot getting blurred when i clicked that you see that effect on the picture

i will upload a pic before the anodising process or even the deburring of the same sink so you can get the real picture/idea


heres a raw pic after cutting on the circular saw
http://Click the image to open in full size.




@sangram
i didnt remember i was registered here too
i just tried the same user name and password that i try on other forums and it seems ive been here before

Yeh that cristi really got me disapointed
All plans went down the toilet

@navinji
well if you are the same person as the one in a famous indian auto forum, you have actaully met me (but probably do not remember)
Yes those sinks can be procured at my workshop

for the 1st and 2nd pic (heasinks) though , a group buy would be better since small quantities cannot be arranged due to some exclusivity clauses

Last edited by magma; 27th November 2010 at 08:07 AM.
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Old 27th November 2010, 07:56 AM   #574
magma is offline magma  India
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Join Date: Jun 2009
@mymindinside
its about 3k for 6 inch length
and unfortunately that lenght is currently fixed unless there is a group buy and i can armtwist my extruder
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Old 27th November 2010, 07:57 AM   #575
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Join Date: Jun 2007
Location: Mumbai/Delhi - India
Hi Magma,
from your reply to Navin i am guessing that your workshop is in Mumbai, is that correct?
could you give us an idea of the minimum quantities involved in a group buy, along with a price per cm/inch.
EDIT: Magma, i think you posted as i was typing, thanks for the price indication. so if one were to buy six inch lengths would it be possible to get them individually? Or is a group buy the only option

cheers,
mymindinside

Last edited by mymindinside; 27th November 2010 at 07:59 AM.
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Old 27th November 2010, 08:12 AM   #576
magma is offline magma  India
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Join Date: Jun 2009
6inch lengths can be bought individually but on order basis
this item is never in ready stock with my extruder since its a high cost item plus he is not supposed to stock this item due to some understanding between him and his customer

group buys would probably be required for other lenghts

and would make a lot of sense of the heatsink shown in the 2nd pic i.e the 8.5 inch extrsion ( purely since that is avalible in only 6 foot lenghts and is easier to procure and also turns out cheaper than the 10inch extrusion , if you calulate weightwise or per inch basis)

All please note : this is not my business/trade, nor am i here to advertise anything or sell any wares or take any cuts/commisions
Audio (actaully ... building stuff ) is just my hobby that sangram made use of

Last edited by magma; 27th November 2010 at 08:15 AM.
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Old 27th November 2010, 09:32 AM   #577
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Join Date: Jun 2007
Location: Mumbai/Delhi - India
The second extrusion (8.5in. width, 75mm fins and 14mm base) looks good. if one needs a deeper enclosure it is possible to stack two of these side by side to get a depth of 17 inches.
magma, thanks for clearing up that you are not a supplier/distributor. with your posts in this thread as my only reference, i thought these heatsinks were designed by you and fabricated by someone for you. These are the widest extrusions i have seen available in India...good job finding this guy!
i would definitely be interested in these, if there is a group buy for the 8.5 inch one. i would take either 4 or 8 pieces of seven inches length(dependent on price). if i can help make the group buy work i am willing to contribute some time as well.

cheers,
mymindinside
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Old 27th November 2010, 01:38 PM   #578
magma is offline magma  India
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Join Date: Jun 2009
there is also a 7 inch flower type extrusion if you are thinking of going side by side
Though these extrusions are made exclusively for a customer , i have access to them since the extruder is a friend and im also an old client

if there is intrest you can start a group buy

heres the 7 inch extrusison
Click the image to open in full size.
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Old 27th November 2010, 01:56 PM   #579
magma is offline magma  India
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Join Date: Jun 2009
first 3 sinks can be procured by me ONLY in 6 foot lengths due to reasons ive mentioned earlier

Type 1 (the 1st pic here )

Specs
8 inch extrusion with a 1 inch gap at the centre , very handy in chip mounting
Base is 5.5 mm thick
and fin height is 42mm

Lengths can be cut as you want ( as long as there are enough buyers to hit 6 feet)

Type 2

This is a flower design heatsink which can do F5 duty (10inch long either deep or side to side)

Specs
7 inch extrsion


Type 3 - Exclusive

Specs
8 inch extrusion
15mm thick base
75mm fin height


PICS - imagine this sink to be identical to the type 4 but of smaller fin dimensions as mentioned , however this sink is one piece pure AL extrsusion and quite exclusive being their top end heatsink

Type 4

Specs
10inch wide extrusion,
16mm thick base and
82 mm fin height-
However this is precut at 6 inch lengths

This is actually a heatsink made by two 5inch extrusions that have been lazer CNC welded at the centre using a pure al weld
However after anodizing you may never notice.Cant make out easily from the pic can you? The base is absolutely flush and level

Once again i re-iterate
i have no commercial intrests in sinks, im not a dealer nor a manufacturer just a fortunate guy who has access to customised extrusion owing to my regular work
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Old 29th November 2010, 03:51 AM   #580
sangram is offline sangram  India
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Join Date: Sep 2002
Location: India
magma, the 7 inch 'flower' extrusion is available for about Rs 2.2K for a 10" length in Calcutta at Railton electronics. They have an even more massive extrusion with a 25mm base that sells for about 4K for a 14" length, but a very similar profile.

I use the one you posted for my F5 power amp, one 10" section per channel.

Anyway I'm going to stop posting project sourcing, planning and construction details here now too, just finished projects. There are some lurkers on DiyAudio who misread and misquote my posts out of turn and without my consent or clarification, in order to mislead people elsewhere. I think you and me will only be talking on email and phone, and I request you not to post projects done for me on any other forum as well. It's a most unfortunate turn of events.
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