Whats the best way to cut a hole in an A1200 Trapdoor

mfletcher · 17 June 2008, 17:35

As the subject says:

I need to cut a square hole in my A1200's trapdoor to allow the fan/heatsink on my accelerator card to poke through. I dont want to do a botch job on the plastic trapdoor. What tools would you recommend that would allow me to cut a clean hole in the trapdoor?

Mark

alphonsus · 17 June 2008, 17:47

Dremmel. Just be careful. Cutting wheel to begin with, just inside the line you want, then use sander/filer to slowly carve back to the line.

alexh · 17 June 2008, 18:39

Surely it would be best to drill a patchwork of holes? You can easily clamp the plastic and use a household drill.

mfletcher · 17 June 2008, 18:58

Quote:

Originally Posted by alexh

Surely it would be best to drill a patchwork of holes? You can easily clamp the plastic and use a household drill.

Unfortunately the heatsink fan protrudes out of the bottom the case slightly, so I would have to cut a hole anyway. And I would like the rest of the trapdoor space covered to keep dust and whatnot out.

alexh · 17 June 2008, 19:11

Bah, use some masking tape. It's even the right colour ;-)

Zetr0 · 17 June 2008, 19:43

@mfletcher

A good solid rotary tool will do... use a small cutting disk AND importantly heres a handy tip, use some electric insulating tape over the plastic, then markout your cutting area on that with pen.

cut just in the line, as the ABS plastic swarf is hot it will stick to the insulating tape, and not back onto the plastic

Akira · 17 June 2008, 19:57

Quote:

Originally Posted by mfletcher

And I would like the rest of the trapdoor space covered to keep dust and whatnot out.

Not much of a chance for that mate, since you'll have a FAN in there getting all the dust in! (even if it blows air out)

Yoto · 17 June 2008, 22:23

Hello mfletcher!
I used aluminum tape, the same one usually used in heating tubes, to avoid dust from getting inside Amiga it also serves along with some glue to keep the heasink in place,the heatsink is under, and a small fan can also be added, although you will have to lift amiga feet a little; if you add a fan you will have to lift them even more. In my case the heatsink is enough, i estimated its size for an environmental temperature of 15 to 17 degrees Celsium (59 to 62.6 farenheit). I uploaded an example below.
I hope it helps.
http://img519.imageshack.us/my.php?image=fot0zp9.jpg

This heatsink is for a Blizzard IV running a 50 mhz 68030 CPU with no FPU

17 June 2008, 17:35	#1
mfletcher Bawbag. Join Date: Mar 2008 Location: Chicago, USA Posts: 343	Whats the best way to cut a hole in an A1200 Trapdoor As the subject says: I need to cut a square hole in my A1200's trapdoor to allow the fan/heatsink on my accelerator card to poke through. I dont want to do a botch job on the plastic trapdoor. What tools would you recommend that would allow me to cut a clean hole in the trapdoor? Mark __________________ A4000/060 w OS 3.9

17 June 2008, 18:39	#3
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 10,551	Surely it would be best to drill a patchwork of holes? You can easily clamp the plastic and use a household drill. __________________ Thalion Webshrine

17 June 2008, 19:11	#5
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 10,551	Bah, use some masking tape. It's even the right colour ;-) __________________ Thalion Webshrine

17 June 2008, 19:43	#6
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 38 Posts: 9,185	@mfletcher A good solid rotary tool will do... use a small cutting disk AND importantly heres a handy tip, use some electric insulating tape over the plastic, then markout your cutting area on that with pen. cut just in the line, as the ABS plastic swarf is hot it will stick to the insulating tape, and not back onto the plastic __________________ Luscious Linkie Time:- www.AmiBay.com Old Skooler

17 June 2008, 22:23	#8
Yoto 1 Potato to Spam´em all! Join Date: May 2008 Location: Lost in a Wine Country Age: 37 Posts: 570	Hello mfletcher! I used aluminum tape, the same one usually used in heating tubes, to avoid dust from getting inside Amiga it also serves along with some glue to keep the heasink in place,the heatsink is under, and a small fan can also be added, although you will have to lift amiga feet a little; if you add a fan you will have to lift them even more. In my case the heatsink is enough, i estimated its size for an environmental temperature of 15 to 17 degrees Celsium (59 to 62.6 farenheit). I uploaded an example below. I hope it helps. http://img519.imageshack.us/my.php?image=fot0zp9.jpg This heatsink is for a Blizzard IV running a 50 mhz 68030 CPU with no FPU Last edited by Yoto; 18 June 2008 at 01:35.

17 June 2008, 17:47	#2
alphonsus Registered User Join Date: Apr 2008 Location: UK Age: 39 Posts: 181	Dremmel. Just be careful. Cutting wheel to begin with, just inside the line you want, then use sander/filer to slowly carve back to the line.

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