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Drilling and tapping Conrad heatsinks
Drilling and tapping Conrad heatsinks
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Old 15th December 2010, 04:22 AM   #51
naz is offline naz  United States
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I did fair number of #6-32 blind holes last week (66). Used one spiral fluted tap for all the wholes and just some WD-40. I was out of rubbing alcohol which works well and is cheap, but I was to lazy to go pick some up. Anyways, go pick up a good tap and keep it straight. A tap guide can be helpful with keeping the tap straight and true to the hole and you can pick them up for a reasonable price online. Also you can always follow up tapping a hole with a bottom tap to cut the final threads if you need to. (I cheated on those 66 holes and used bridgeport to thread all of the holes.)

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Old 16th December 2010, 01:59 AM   #52
CanAm Man is offline CanAm Man  United States
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Naz, good thoughts. I did my heatsink taps last night, and survived without taking any casualties. I used a new fluted tap (bought three), and tapped all my 6-32 holes without incident. Did the same with the few 4-40 and 8-32 holes I have in my F5 chassis baseplate (3/16" aluminum). For each series, I had taken a scrap piece of aluminum block, and drilled guide holes in it for the three sizes. Then used a hand tap to tap, back out, clean, lube, etc, etc, etc. Totally uneventful. I had borrowed thread lube from a friendly machine shop buddy (and I swear the "lube" smelled like kerosine. Onward, and forward--excelsior.
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Old 17th December 2010, 05:44 AM   #53
MashBill is offline MashBill  United States
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I use Balax threadforming taps. They do not cut the metal, so no chips to contend with. They provide a much better threaded hole than cutting taps. Once you try them, you will never use a cutting tap again.

Check out Thredfloer Taps | Balax | Forming Taps, Cutting Taps, Thread Gages for more info. You can buy them at Amazon or eBay.

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Old 17th December 2010, 06:38 AM   #54
454Casull is offline 454Casull  Canada
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