http://www.npfasteners.com/pdfs/max-rec-tightening-torque.pdf
M4 = ~2 X M3
But tread on sink will give way much earlier even if one uses elicoil inserts
M4 = ~2 X M3
But tread on sink will give way much earlier even if one uses elicoil inserts
Amazon.co.uk: helicoil inserts
M4 = ~2XM3 torque but tread strip off alu sinks before that especialy if one do not use Helicoils inserts
M4 = ~2XM3 torque but tread strip off alu sinks before that especialy if one do not use Helicoils inserts
http://www.diyaudio.com/forums/attachments/pass-labs/261113d1326899846-my-f5-mule-001.jpg
Yup M6 is beterer and M8 even more but then one need Chain block to move Papa amp or ask Zen Mod how painful is back pain🙄
If done properly Kerafol will take the pressure and more pressure = less resistance realistically the limit is when TO case give up and crack
Yup M6 is beterer and M8 even more but then one need Chain block to move Papa amp or ask Zen Mod how painful is back pain🙄
If done properly Kerafol will take the pressure and more pressure = less resistance realistically the limit is when TO case give up and crack
Downloads / Data sheets
From data sheet for 82/86 see on picture what up when pressure is 40 N/ cm square
Nah no idea about conversion from pints to liters
From data sheet for 82/86 see on picture what up when pressure is 40 N/ cm square
Nah no idea about conversion from pints to liters
A decent M3 can hold 500 lbs without leaving the plastic region.
(which is over a dozen times the 60 N/cm2 on an IRFP240)
(which is over a dozen times the 60 N/cm2 on an IRFP240)
Tanks
So one need to convert tightening torque to the pressure applied to the surface. Could you do that for me please ?
call a TO220 = 1/4 inch square to keep it simple if U please
So one need to convert tightening torque to the pressure applied to the surface. Could you do that for me please ?
call a TO220 = 1/4 inch square to keep it simple if U please
1/4si is ~1.6 cm2
Advisable torque for a TO-220 is 0.5 Nm (both for a regular one, as for the F-version)
For convenience sake, assume an M3 screw has an effective diameter of 3 mm
T = C * D * F
0.5 = 0.34 * 0.003 * F
F = 490 N
Makes the mounting pressure 306 N/cm2 (>5 times 60 N/cm2)
If the screw is lubricated for the torquing, C is ~0.20 (the C factor also depends on the material), in which case pressure would go up by 70%
(screw bonus is sucker in domus)
For TO-220s, it makes sense to use clamps instead of the mounting hole because of the hole location and top of the package.
Advisable torque for a TO-220 is 0.5 Nm (both for a regular one, as for the F-version)
For convenience sake, assume an M3 screw has an effective diameter of 3 mm
T = C * D * F
0.5 = 0.34 * 0.003 * F
F = 490 N
Makes the mounting pressure 306 N/cm2 (>5 times 60 N/cm2)
If the screw is lubricated for the torquing, C is ~0.20 (the C factor also depends on the material), in which case pressure would go up by 70%
(screw bonus is sucker in domus)
For TO-220s, it makes sense to use clamps instead of the mounting hole because of the hole location and top of the package.
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Short answer is that 0.5 mm sheet of 86/525 equals 86/82 if compressed to ~0.21 mm thickness.
(5.5 : 6.5 = 0.21 : 0.25)
If you dare to compress it to 0.1 mm, thermal resistance should be twice as good as 86/82.
Costs a fifth more though.
Why bother for 1C difference, read EUVL's article for Linear Audio.
(the older 86/525 datasheet only went to 1 mm sheet thickness, not 0.5 mm)
Ok thanks for your answers.
That bothers me because the only web site where I can find 86/82 is more than twice expensive than the 86/525...
and I just find 86/600 in 0.5mm thinkness same price than the 86/525
Damien
That bothers me because the only web site where I can find 86/82 is more than twice expensive than the 86/525...
and I just find 86/600 in 0.5mm thinkness same price than the 86/525
Damien
I bought .5 square meter of the Keratherm red for several projects. Have plenty left over, reasonable pricing, how much do you need in square centimeters?
That is reasoning without any non-linearity factor in the ratio between thickness/thermal conductivity applied by the torque. Sure the more torque, the less thickness and better the thermal conductivity. But as it gets thinner, it won't necessarily increase conductivity by a linear factor. There is a limit in compression of these thermal sheets, where thermal conduction can't be raised by any factor.
Still a very good product. ZhouFang used to sell some in his thread.
Best,
nAr
Yeah, that's odd, Conrad.fr charges €8 more for the same 86/82 sheet size (€36 versus €28 in D/NL)
On the other hand, a 120 x200 mm sheet of 86/525 is €0.99 cheaper in France.
ESP - Heatsink design and transistor mounting
Pretty understandable + links at end are good but Kerafol does not exist at that time
Pretty understandable + links at end are good but Kerafol does not exist at that time
