How much torque is 5N-cm?
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 27th January 2020, 02:53 PM #1 myleftear   diyAudio Member     Join Date: Sep 2017 Location: Luzern How much torque is 5N-cm? Hi! I just found this quite useful info on properly mounting jfets (or other to-220 / to-247 etc. devices): https://www.infineon.com/dgdl/Infineon-AN2013_12_Screw_Tightening_Torque-AN-v1.0-en.pdf The recommendation is 0.6 - 1 Nm. (hold ~60 - 100gr at 100cm distance, or ~6000 - 10000gr at 1cm distance) If I understand it correctly, this is quite tight for a M3-thread, but not "as tight as I'd tighten the wheel-bolts of a car"... ... __________________ dobedobedo... Last edited by myleftear; 27th January 2020 at 03:14 PM.
 27th January 2020, 03:12 PM #2 Mark Tillotson diyAudio Member   Join Date: May 2018 Location: Cambridge UK Firstly convert to Nm, 100Ncm = 1Nm, so 5Ncm = 0.05Nm My rough guide to torques from human arm: 0.1--0.3Nm - finger and thumb twisting 1Nm - whole hand turning screwdriver 10Nm - both hands turning a steering wheel 100Nm - break your arms! The symbol for the newton is "N", not "n" which means nano. SI units and multipliers are always case sensitive. 0.6Nm is pretty normal rating for M3 steel-to-steel fastening. Direct into soft aluminium you'd use much less, 0.1Nm perhaps, or risk stripping threads, so it depends if using bolt and nut or bolt and tapped Al heatsink.
myleftear
diyAudio Member

Join Date: Sep 2017
Location: Luzern
Quote:
 Originally Posted by Mark Tillotson The symbol for the newton is "N", not "n" which means nano. SI units and multipliers are always case sensitive.
Thank you, Mark.
I corrected the nanometer back to Newtonmeter
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JMFahey
diyAudio Member

Join Date: Mar 2009
Location: Buenos Aires - Argentina
Quote:
 Originally Posted by Mark Tillotson Firstly convert to Nm, 100Ncm = 1Nm, so 5Ncm = 0.05Nm My rough guide to torques from human arm: 0.1--0.3Nm - finger and thumb twisting 1Nm - whole hand turning screwdriver 10Nm - both hands turning a steering wheel 100Nm - break your arms! The symbol for the newton is "N", not "n" which means nano. SI units and multipliers are always case sensitive. 0.6Nm is pretty normal rating for M3 steel-to-steel fastening. Direct into soft aluminium you'd use much less, 0.1Nm perhaps, or risk stripping threads, so it depends if using bolt and nut or bolt and tapped Al heatsink.
Excellent data.

Doubly useful because in Audio/Electronic Forums people is concerned into minute details of Electrical units (which is fine of course) but in general ignore mechanical ones, which are also very relevant to DIYers. (which are supposed to roll up their sleeves and get their hands dirty)
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 27th January 2020, 06:42 PM #5 ubergeeknz   diyAudio Member   Join Date: Aug 2018 Torque until it lets go, then back off a quarter turn
 27th January 2020, 07:01 PM #6 kevinahcc20   diyAudio Member     Join Date: Apr 2009 Location: Farmington Hills, MI USA That converts to 5.3 to 8.8 lb-inch (or inch-lbs in the old days), probably not a critical specification with that wide a range but clearly hand tight with a screwdriver and avoid using your 20V impact gun! __________________ Kevin(ahcc20)...I'd rather have a bottle in front of me than a frontal lobotomy!
myleftear
diyAudio Member

Join Date: Sep 2017
Location: Luzern
Quote:
 Originally Posted by kevinahcc20 That converts to 5.3 to 8.8 lb-inch (or inch-lbs in the old days), probably not a critical specification with that wide a range but clearly hand tight with a screwdriver and avoid using your 20V impact gun!
I wasn't sure wether it was just tight or veeery tight.
But, as you say, the range is so wide that it should be ok to go as far as you want it to sound good afterwards (so don't exaggerate, it's not shipyard work...)

My first (ACA, recently) was way too loose, but all went well though

(PS: The experts are explicit: _don't_ use tools like in the image below)
Attached Images
 2-anwendung-ingersoll-rand-druckluft-schlagschrauber-1-zoll.jpg (69.1 KB, 66 views)
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 28th January 2020, 05:05 AM #8 PRR   diyAudio Member     Join Date: Jun 2003 Location: Maine USA Google usually knows this stuff: 1 Nm to inch pounds - Google Search

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