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Kerry

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Posts posted by Kerry

  1. Technical Assistance/Advice Thread

    in Do It Yourself

    Posted · Edited by Kerry

    A few months ago a broke a #4-40 tap in a heat sink.  After a lot of cursing and futile attempts to get it out, I just left it for another day.

    I felt compelled a few days ago to go after it again.  This time I came across an article on the use of alum powder to dissolve the ferrous metal (tap) from the aluminum without affecting the aluminum.  Long story short, I got some potassium alum powder, set up a double boiler with a Pyrex container and six hours later and a little baby sitting, the tap was gone and I was able to save the threads and all.  Kind of amazing.

    You can see the small bubbles coming from where the tap was.  Note that I don't remember any chemistry, so I'm hoping this was safe.

    20200227_181723000_iOS.MOV

    • Like 11

  19. DIY mini T2 Build Thread

    in Do It Yourself

    Posted

    On 1/11/2020 at 12:37 PM, JoaMat said:

    Regarding GRHV regulators. What’s the minimum voltage differential/headroom for the GRHV to work properly?

    I’ve been able to run the regulators with a 12-15v differential. Yes load can come into play. To be safe you should add another 10% on top of the desired HV plus the differential. That’s to accommodate voltage variations of the mains, which may not be applicable for you. 

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