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Old 13th May 2003, 03:39 AM   #11
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Here's another chart that you can print out:
http://www.woodmagazine.com/compstor/speedchart.pdf
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Old 13th May 2003, 06:51 AM   #12
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Quote:
Originally posted by Peter Daniel

1" is about 24.5mm.
Almost right 1" = 25.4 mm

http://www.wihatools.com/conversion.htm
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Old 13th May 2003, 01:41 PM   #13
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Somehow I knew it would be safer to say "around 25mm"
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Old 13th May 2003, 07:12 PM   #14
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Duck, I should have known you had a drillpress... I kinda fubar-ed one of the zen heatsinks
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Old 13th May 2003, 07:40 PM   #15
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Quote:
Originally posted by Tazzy
Duck, I should have known you had a drillpress... I kinda fubar-ed one of the zen heatsinks
Yes, I just red your post on hifi.nl.
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Old 13th May 2003, 07:48 PM   #16
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Quote:
Originally posted by Tazzy
Duck, I should have known you had a drillpress... I kinda fubar-ed one of the zen heatsinks
Hi Tazzy,

pity about the heatsink, can you fix it or work around it? Was looking at the heatsink diagram on your website. Interesting use of the U bracket on top for additional heatsinking. Was wondering if you had considered two L shapes - one on the bottom as you have shown and one above where you now have the U. This would give twice as much coupling to the heatsink. However, the top surface is plastic so not as much heat can be transferred through this surface but it still might be worth it.

The top L bracket would need to be accurately drilled to get a tight sandwich of the FET. This accuracy could be reduced by bolting the upper L to the heatsink using a slot rather than a hole. This gives an adjustment mechanism. Slots are easy to cut in aluminium - just drill two holes side by side and file out.

James
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Old 13th May 2003, 07:54 PM   #17
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Plans changed a bit. Kristijan advised against mounting the pcb in 90 degree angle to the heatsink.

The U profile stay's, don't think it will dissipate much heat but it helps to spread the mounting pressure
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Old 13th May 2003, 08:06 PM   #18
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Quote:
Originally posted by vpharris
Here's another chart that you can print out:
http://www.woodmagazine.com/compstor/speedchart.pdf
Thanks guys!

This was just the info I needed. I tried drilling om 1750 rpm with a 4.2mm hole and it went great! I messed up a piece of 16mm x 16mm aluminium bar by trying but I will get some new ones saturday... no problem. I will practice a bit more before I put the drill on my heatsinks though!

I surely beats using a normal drill machine and a shaky press holder for it. And it wins hands down from drilling out of hand!

Edwin
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Old 13th May 2003, 08:22 PM   #19
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Hi,

In addition to what already is said. When drilling aluminium lubricate it with alcohol or spirit (just spiritus in Dutch ). But clean up your drilling machine and oil it after work done otherwise your drilling machine get very rusty. Use new standard HSS drills for best results and don’t use these drills for anything else. If you do a lot of drilling aluminium it is worth buying drills special designed for aluminium. But these are usually not available at a general DIY shop. You have to go to professional tool suppliers for these.

Cheers
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Old 14th May 2003, 04:48 AM   #20
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A drillpress is on the wishlist for next month.

Pjotr, it was one of the heatsinks I bought from you that messed up
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