Also, you fail horribly at math. Like, you need to go back to remedial arithmetic horribly. A hundred years? Not even close. Seriously - off by factor of 100 wrong.
Also, you fail horribly at math. Like, you need to go back to remedial arithmetic horribly. A hundred years? Not even close. Seriously - off by factor of 100 wrong.
Also, you fail horribly at math. Like, you need to go back to remedial arithmetic horribly. A hundred years? Not even close. Seriously - off by factor of 100 wrong.
1000 presses/day * 365 days/year = 365,000 presses/year.
Divide that into the estimated lifecycle of 50,000,000 presses and you're left with approximately 137 years before switch failure.
Would you please correct my mistake, rootwyrm?
Also, you fail horribly at math. Like, you need to go back to remedial arithmetic horribly. A hundred years? Not even close. Seriously - off by factor of 100 wrong.
Humidity and dust will ensure you never reach the numbers
Also, you fail horribly at math. Like, you need to go back to remedial arithmetic horribly. A hundred years? Not even close. Seriously - off by factor of 100 wrong.
1000 presses/day * 365 days/year = 365,000 presses/year.
Divide that into the estimated lifecycle of 50,000,000 presses and you're left with approximately 137 years before switch failure.
Would you please correct my mistake, rootwyrm?
The numbers are 50M actuations for linear Cherry MX. Blues, Greens and Whites are rated at only 10M actuations.
Note also, that this is for actuations. Any tactile switch will have its tactile bump on the slider worn down long before that.
The numbers are 50M actuations for linear Cherry MX. Blues, Greens and Whites are rated at only 10M actuations.
Note also, that this is for actuations. Any tactile switch will have its tactile bump on the slider worn down long before that.
Your math is right...I've seen Rootwyrms math..it is the way he calculates it that is wrong..he estimated 50 million for the entire KEYBOARD..which is wrong..
The numbers are 50M actuations for linear Cherry MX. Blues, Greens and Whites are rated at only 10M actuations.
Note also, that this is for actuations. Any tactile switch will have its tactile bump on the slider worn down long before that.
Nope. Those were all revised to 50M a few years back. So there's a reason for it. Actuation is "you press the switch and it generate electrical signal as designed."
Dug this up for another thread, but will share here too.Your math is right...I've seen Rootwyrms math..it is the way he calculates it that is wrong..he estimated 50 million for the entire KEYBOARD..which is wrong..
LRN2USESEARCHFUNCTION
I have elaborated on the math that gives me an expected lifetime of 187 days for Cherry MXes, at great length, and holy crap I actually know how to unit test AND measure these things! I mean there's no WAY someone who cares about their keyboards would do silly things like research, RIGHT?
My cherry keychain is losing its clickyness after about 6 months.
The numbers are 50M actuations for linear Cherry MX. Blues, Greens and Whites are rated at only 10M actuations.
Note also, that this is for actuations. Any tactile switch will have its tactile bump on the slider worn down long before that.
My cherry keychain is losing its clickyness after about 6 months.
There is a difference between saying "math is wrong" and "reasoning is wrong". The first implies an error in calculations, forgetting some unit conversion, etc. The second says that you set up those calculations incorrectly to start with. I suspect rootwyrm is actually trying to say the latter.
There is a difference between saying "math is wrong" and "reasoning is wrong". The first implies an error in calculations, forgetting some unit conversion, etc. The second says that you set up those calculations incorrectly to start with. I suspect rootwyrm is actually trying to say the latter.
There is a difference between saying "math is wrong" and "reasoning is wrong". The first implies an error in calculations, forgetting some unit conversion, etc. The second says that you set up those calculations incorrectly to start with. I suspect rootwyrm is actually trying to say the latter.
Yeah...In actuality, Rootwyrm has made some incorrect assumptions in his calculation....
Even with dust and humidity, how much of the keyboard's lifespan would that actually annul? Even if other wear factors cut off a full 100 years of the keyboard's life, that would still leave the user with 36.98 years of service, which I would be quite content with. However, even that number seems high to me, though there are some Model Ms pushing that boundary. Others have failed before reaching it.
I doubt anyone here would be in a position to test it out, either. Stick with the same keyboard for over a decade and use it faithfully every day?
In other words, it is somewhat deceptive to advertise switches as lasting for 50,000,000 actuations, and I think the statement needs to be put in context. When advertising their keyboards, a company that lists this number should put a disclaimer that reads something like:
Switch life: rated for 50,000,000 actuations! Warning, there is no chance in hell you will ever get anywhere near 50,000,000 actuations before the keyboard dies on you.
There is a difference between saying "math is wrong" and "reasoning is wrong". The first implies an error in calculations, forgetting some unit conversion, etc. The second says that you set up those calculations incorrectly to start with. I suspect rootwyrm is actually trying to say the latter.
ah.. no,, i don't care if he's your friend. but by his post, he's clearly throwing Factor of 100 around... so.. he means the former and not the latter.
There is a difference between saying "math is wrong" and "reasoning is wrong". The first implies an error in calculations, forgetting some unit conversion, etc. The second says that you set up those calculations incorrectly to start with. I suspect rootwyrm is actually trying to say the latter.
ah.. no,, i don't care if he's your friend. but by his post, he's clearly throwing Factor of 100 around... so.. he means the former and not the latter.
That's not what my post was about :) I was just trying to clarify for him that the actual calculations (a.k.a. the math) shown here are correct.
Also he says "I have elaborated on the math that gives me an expected lifetime of 187 days"--that's not a factor of 100. That's a result of a totally different calculation.
stop defending himShow Image(http://www.cute-factor.com/images/smilies/onion/073.gif)...
let's all just forget this ever happened...
The interesting thing is that Cherry is a little inconsistent about their numbers. One spec page I found gives 1,000,000 MCBF (cycles), another gives 1,000,000,000 for the MX switches. Then their current pages don't give MCBF at all, but just a total actuations figure which is not at all as helpful for statistical purposes...
Here's an idea for the Korean spies - Add a chip on the board to keep counts of key pressed. Make these stats available from the USB port to keep the cost low. On high end bling bling, use a LCD display to show the numbers!!!
I'll take donation for giving up the idea :-)
Buckling Springs, I knew it, You've finally come forward as an NSA spy...Show Image(http://www.cute-factor.com/images/smilies/onion/9bbc76d5.gif)
Abdulmuhsee, I don't think we need to theorize so much. Fact is, if we took a survey on geekhack, we probably would be able to determine how many keyboards and how much usage and how many switches were used.
50million is impossible, based on empirical observation.
Honestly, I don't really care that his calculation was based on an incorrect premise, but I do care when someone calls me a horrible failure that needs to go back to remedial arithmetic.
Honestly, I don't really care that his calculation was based on an incorrect premise, but I do care when someone calls me a horrible failure that needs to go back to remedial arithmetic.
Because you are. Deal with it. You claimed it would be unreasonable to test and cited a hundred years of typing.
First of all, a mechanical actuator can run 24x7x365 and hey there's 31.5 million seconds in a year. Which means performing 50 million actuations at an entirely reasonable rate of 3 per second gives you 94,672,800 actuations performed per year per actuator. Or nearly two full destructive tests per year. And that's the low side - they likely do a 250ms cycle (or lower) meaning 4 actuations per second giving you 12,500,000 seconds or just 144 days for full destructive cycle.
Secondly, you seem unable to differentiate MTBF and MTTF, or use the search function properly. Which is filed under "not my problem." I'm using complex models that take a variety of factors into account including exactly how much I type using over a decade of empirical data. You have yet to provide any equations whatsoever to back up your "100 years" claim, much less any explanation of where you got that number other than pulling it out of your ass.
But since you appear bad at math and reading, here, I'll help you out with the basic arithmetic that proves you're full of it.
The world's fastest is 956 CPM (http://geekhack.org/index.php?topic=45212.msg943399#msg943399).
There are roughly 124,800 minutes of work in a year (52 * 40).
That's 119,308,800 keystrokes in a year.
Of these 119,308,800 keystrokes, they are unevenly distributed with anywhere from 60-95% of them on just 37 keys.
That gives an average of 3,224,562 actuations per individual key presuming use of 37 keys and evenly distributed.
These 37 keys are not evenly distributed. Count the number of E's in the previous sentence as example.
Even if we falsely presume that all 37 keys are evenly distributed that gives a MTBF of 15.5 years and a realistic MTTF of <9 years.
And this is all predicated on no more than 40 hours per week of usage ever, with not more than a total of 2,080 hours of usage in a single year.
Because you are. Deal with it...
...But since you appear bad at math and reading, here, I'll help you out with the basic arithmetic that proves you're full of it.
Because you are. Deal with it...
...But since you appear bad at math and reading, here, I'll help you out with the basic arithmetic that proves you're full of it.
Will you just shut up already? I didn't think I'd need to add anyone here to the ignore list, but you, sir, are a real brat.
You're both pretty brattyShow Image(http://www.cute-factor.com/images/smilies/onion/07baa27a.gif)
You're both pretty brattyShow Image(http://www.cute-factor.com/images/smilies/onion/07baa27a.gif)
If you say so :rolleyes:
Because you are. Deal with it...
...But since you appear bad at math and reading, here, I'll help you out with the basic arithmetic that proves you're full of it.
Will you just shut up already? I didn't think I'd need to add anyone here to the ignore list, but you, sir, are a real brat.
Because you are. Deal with it...
...But since you appear bad at math and reading, here, I'll help you out with the basic arithmetic that proves you're full of it.
Will you just shut up already? I didn't think I'd need to add anyone here to the ignore list, but you, sir, are a real brat.
You're the one who demanded math to back it up.
Now you're whining when it's provided.
Maybe go back to Reddit.
^This thing don't even bottom out.
They probably use one of these:damm! i like that machine! i want to put it at home and look at it "typing"
I have elaborated on the math that gives me an expected lifetime of 187 days for Cherry MXes, at great length, and holy crap I actually know how to unit test AND measure these things! I mean there's no WAY someone who cares about their keyboards would do silly things like research, RIGHT?
I have elaborated on the math that gives me an expected lifetime of 187 days for Cherry MXes, at great length, and holy crap I actually know how to unit test AND measure these things! I mean there's no WAY someone who cares about their keyboards would do silly things like research, RIGHT?
So what about your 187 days? It isn't your math..it was always your assumptions....The letter "E" is apparently in 12%. I think TP4 said spacebar is 16% so even using that....that is 19 million a year assuming you are the fastest typer ever and doing that for 8 hours constantly without any vacation days, holidays, etc..(What a bogus assumption that would be).
So in the LEAST....being the fastest typer....and all that..that is more than 2.5 years....So at least now admit your 187 days or whatever you were claiming months ago and now, is false and you made those incorrect assumptions...no real shame there..
it's not even the fastest typer, the most prolific writer could down 2 boards his WHOLE WORKING LIFE 70 years.
No coders or any other key-users would approach his amount...