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Thread: Lapping, it does a heatsink good!




  1. Default

    This is another Fatguy story with no real point but possible information on anyone going to lap a heatsink.

    After reading some guides on lapping, i decided that was the best thing for my volcano 7+. When I got it, it looked pretty junky, and had some deep scratches in it. I figured it wouldnt matter too much, as it cooled a hell of alot better than my stock AMD heatsink. Well I jsut recently got my 2800 barton, and just for kicks I put that retail sink (with a copper base) on the 1600, and it cooled almost as good as the 7+. So I was pretty sure the scratches were hurting it.

    So heres the end all guide to heatsink lapping by the Fatguy himself, including some things that the usual guides dont tell ya.

    Step #1: Puchasing.

    What you need: Sandpaper, Water+Dish detergent, rubbing alcohol, paper towels/clean towel, Flat surface, Time.

    Sandpaper: This is a realy pain in the ass to find. I went to my local hardware store, and they had nothing over 600 grit, so then I went to Lowes, and they also had a very poor selection, with nothing over 420 grit. I was stuck. Well I had to get some peppers for supper anyway, so I went ot Wal-Mart, and on a whim I ran into the auto section to find a pack of sandpaper with a selection of 200-600 grit, and some 1000 grit and 2000 grit wetordry paper. You need sandpaper thats "wet", as you'll be using water. That brand was Imperial WetorDry, the assorted pack was big sheets and the 1000 and 2000 came in small packs of 5. The 3 packs together was around 9 bucks, not too shabby, as you'll have spare paper to do more than a few heatsinks.

    Water: Get some water, put it in a bowel with some dish detergent, dawn apple scent is what I used, smells nice. The reason you want water is to get the sandpaper wet, and wet sandpaper makes a nice shiny lap, dry would make it scratchy. The soap helps it slide on the paper, and removes the copper from the water (I think)

    Alcohol and Towels: Use this to clean the heatsink after each stage of lapping to get any excess copper off.

    Flat Surface: I found a piece of mirror laying in my basement, worked great. Anything perfectly flat and hard works. I recommend glass/mirror.

    Time: Took my 1 and a half episodes of law and order to do this.


    The process is simple:

    Take the sandpaper and SOAK it in the water. At first I only used a few drops, and this really messed up the sanding. You need to soak the whole sheet in the water and then poor some more water on the paper, and keep pooring on as it dries up.

    Put the sandpaper on your piece of flat hard material and hold it in place with one hand. Then hold your heatsink by the sides and glide it around the sandpaper in a circular motion. Dont apply any unneccesary downforce at all.

    Now at first, it gonna stick and its gonna take some real effort to get it to move around, this is the sandpaper doing its job. After 5 or 10 minutes it will eventually get easier, and this is how you know that you're done with that grit. Once it gets very easy to move around the sandpaper, you only need to go a few more minutes and then switch grits.

    Clean the heatsink with alcohol and switch grits. I went from 420 to 600 to 1000 to 2000. This got rid of the scratches and left a perfect mirror finish.

    Just remember to keep wetting the paper down.

    My sources can be found by typing "Heatsink Lapping Guide" into google, the first 5 or 6 entries are where I got the info from.

    I would of had pictures, but the camera would not give a good shot, and for some reason I have a white haze in the middle of my heatsink which I cant get off with alcohol, not sure what it is or if it will affect performance, but anyway, hope this helps. Ill have temps once my new mobo gets here.
    The FatGuy's Rig:

    <small>AMD 1600+ XP O/C'd to 1560 mhz // Thermaltake Volcano 7+ // Aopen AK77 Pro K266(A) Chipset O/C'd to 147 mhz // 256MB Elixir PC2100 DDR CAS2 // Visiontek GeForce4 Ti4200 O/C'd to 310/580 w/ Thermaltake HSU // SoundBlaster Audigy X-Gamer // WD205BA 20GB 7200 // Sony 52x/24x/52x // Linksys 10/100 NIC // ThermalTake 480w Butterfly PSU // Silver Windowed Aluminum Mid-Tower Case (Modded) // Vantec Nexus Fan Controller// Thermaltake 80mm Blower // 3xEvercool 80mm Fans // 2xBlue Cold Cathodes // 2xSound activated Blue Cold Cathodes // Dell 17" Monitor // Microsoft Trackball // Creative 5.1 Speakers</small>

    Come Crunch with TweakTown

    <img src="http://www.statgfx.com/statgfx/folding/?&username=FatGuy3&border=0,0,0&custom =0,0,255&label=0,0,0&header=255,0,0&st ats=0,0,255&trans=yes&template=fah_origina l&.jpg" alt="www.Statgfx.com" />

  2. #2
    Join Date
    Dec 2002
    Posts
    4,246

    Default

    have you considered entering the 'User Reviews' competition?
    I've gone too far and need to move on!

  3. Default

    I have, I was gonna write one up on the butterfly, but im lazy :)

    Didnt see a review of heatsink lapping though.
    The FatGuy's Rig:

    <small>AMD 1600+ XP O/C'd to 1560 mhz // Thermaltake Volcano 7+ // Aopen AK77 Pro K266(A) Chipset O/C'd to 147 mhz // 256MB Elixir PC2100 DDR CAS2 // Visiontek GeForce4 Ti4200 O/C'd to 310/580 w/ Thermaltake HSU // SoundBlaster Audigy X-Gamer // WD205BA 20GB 7200 // Sony 52x/24x/52x // Linksys 10/100 NIC // ThermalTake 480w Butterfly PSU // Silver Windowed Aluminum Mid-Tower Case (Modded) // Vantec Nexus Fan Controller// Thermaltake 80mm Blower // 3xEvercool 80mm Fans // 2xBlue Cold Cathodes // 2xSound activated Blue Cold Cathodes // Dell 17" Monitor // Microsoft Trackball // Creative 5.1 Speakers</small>

    Come Crunch with TweakTown

    <img src="http://www.statgfx.com/statgfx/folding/?&username=FatGuy3&border=0,0,0&custom =0,0,255&label=0,0,0&header=255,0,0&st ats=0,0,255&trans=yes&template=fah_origina l&.jpg" alt="www.Statgfx.com" />

  4. #4
    Join Date
    Jan 2004
    Posts
    1

    Default

    Hello all,
    Here's a pic of the Thermalright SP97 lapped (600,800,1200,2000 grit). Used it with AS 5 and a 92mm Panaflo, I gained a 7 degree overall drop from my old Tt Silent Boost HSF. I might also mention, that I pulled the NB heatsink and lapped it and applied AS 5 to it as well when I had the mobo out for SP97 install.

    grtz,
    gng

    DFI Lanparty NFII Ultra B
    1024 Mushkin PC3500 lvl II BH5
    AMD XP 2500+ Barton @ 220*11
    WD360GD 36.7g Raptor
    WD1200JBRTL 120g+40g EIDE Dump Drives
    Thermalright SP97(Lapped)/Panaflo 92mm HSF
    Gigabyte 9200 (Non-SE) 128DDR
    Lite On Black 48x24x48x16 CD/DVD Combo
    Sony Dru500 DVDRW
    Antec Sonata/380 Truepower

  5. #5
    Join Date
    Sep 2002
    Posts
    138

    Default

    looks good enough to shave in


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