phase linear 400

mlucitt

mlucitt

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WOPL Sniffer said:
I read the specs on the sil pads and never saw the torque specs but it does say as long as there are no burrs or defects to cut the sil pad, they'll take 1000lbs of pressure which seems like more than 6 inch pounds. ?????

https://www.farnell.com/datasheets/99609.pdf
Click to expand...
Based on my precise calculations, when properly torqued to 6 inch-pounds, the T0-3 transistors will exert 109.329 pounds of pressure on the Silpads.
I am using an applied torque of 6.00 inch-pounds, a bolt/screw diameter of 0.2744" (which is the major diameter of a #6-32 screw 0.1372" times two because there are two screws), and a 0.2 coefficient of friction for steel fasteners.
 
gene french

gene french

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mlucitt said:
Based on my precise calculations, when properly torqued to 6 inch-pounds, the T0-3 transistors will exert 109.329 pounds of pressure on the Silpads.
I am using an applied torque of 6.00 inch-pounds, a bolt/screw diameter of 0.2744" (which is the major diameter of a #6-32 screw 0.1372" times two because there are two screws), and a 0.2 coefficient of friction for steel fasteners.
Click to expand...
you will have to adjust a bit...although your coefficient of friction for steel is right on...the screws are stainless....ss/ss has a coefficient of 0.4 and i believe the correct answer for ss/steel would be 0.3....
 
mlucitt

mlucitt

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gene french said:
you will have to adjust a bit...although your coefficient of friction for steel is right on...the screws are stainless....ss/ss has a coefficient of 0.4 and i believe the correct answer for ss/steel would be 0.3....
Click to expand...
Well, it was a BOE (back of the envelope) calculation. The formula is T=LF sinØ for torque, then F=T/LsinØ for force. Yes, using 0.3 for the coefficient of stainless steel would yield 72.886 pounds of force on the Sil-Pad.
 
gene french

gene french

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mlucitt said:
Well, it was a BOE (back of the envelope) calculation. The formula is T=LF sinØ for torque, then F=T/LsinØ for force. Yes, using 0.3 for the coefficient of stainless steel would yield 72.886 pounds of force on the Sil-Pad.
Click to expand...
i was using a napkin...old school...
lol
i am still stuck on e= mc²...
 
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George S.

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Rack handles are nice. Every amp should have handles. Do a search "handles" by Joe and Fred. Whatever you get they MUST use the correct diameter screw or bolt. NO drawer screws. See my thread WOPL building, 400 Rack Handles.
 
J!m

J!m

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The old handles were 10-32 that I deal with. New ones are probably a near metric equivalent. It is important to use the longest screws possible or you can end up ripping the threads out of the handle, which usually doesn’t end well…
 
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George S.

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Or if you want original bolts I have 4. Fred posted a photo of really nice ones a while back and Joe once posted a link. Correct bolt diameter is a must or things move and get scratched.
 
Gepetto

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RAF makes handles and ferrules. That was the earlier post that I made. They make quality Made in USA hardware. Not inexpensive but definitely first class.

I use a lot of their hardware. They are now part of MW Components, likely a private equity play.

RAF Electronic Hardware - Precision Machined Parts | MW Locations | MW (mwcomponents.com)

I see quite a bit of private equity buyouts lately of smaller US hardware manufacturers, gobbled up into a larger corporate entity (with the attendant lower service level and higher prices). Essentra is another one of those conglomerates.
 
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