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Re: HP 3478A - working


 

On 2/22/19 11:42 PM, Don Bitters via Groups.Io wrote:
Just a brief comment on your bent corner frame. The frame is heat/pressure cast powdered aluminum, magnesium. If you heat it and apply pressure to the bend it will likely break the corner off. I have had mixed success bending corners of the 85660, 85680, and 85662 from frames. The technique I used was about 60-70% successful - a sharp, abrupt shock caused the deformation without breaking the frame, another abrupt shock should reverse some of the damage without breaking the frame. Remove the frame, support the corner in a solid right angled bracket (like a piece of heavier steel angle stock in a vise. Take another piece of square stock and place it on the inside of the deformation and then smack the square stock with a hammer hard close to the deformation. This should remove most of the bending, but note again my success rate is not 100%. The next best choices are live with it, or find another sacrificial unit.
I didn't look at the OP's pic this time around (busy few days here),
but every 3468/3478 I've seen has had a plastic frame.

-Dave

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Dave McGuire, AK4HZ
New Kensington, PA

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