Thanks Eng.Mindset. Really useful to brush up on something I learned 30 years ago. Consider: Do a screenshot of the implementation in Excel, showing the formula in that format.
Having lived most of my life using imperial formulas and recently needing to work in metric, I find myself loving the metric system more and more. My dear ol Dad said you need to work in both so get used to it. It makes using these formulas so much easier. Great video, did you take pitch into consideration or mainly round/V belt? I may have missed that in the video but I work with timing pulleys and splined pulleys where the pitch usually is larger than the actual pulley diameter.
Thanks for the video, but I think you need to explain how you come to the last part of the first formula (pd2-PD1)² / (4xCD). My AutoCAD does not agree with you, it is close though 1675.408 vs 1675.167. Do you know where to find a formula that does it 100% correct ?
I have used the formula to calculate the center to center distance of known belt length, then tried to verify the results with 2 Different CAD Programs, and indeed it is off for me as well. when I apply the center distance between my two pulleys, then draw the belt tangent to the two pulleys, it's off... 740.391mm when I put in 740.000000000 for my belt length. Apparently, this is only an approximation, and not only this formula... but EVERY SINGLE Center distance calculator on-line that I have tried.. they are all off. I even replaced the 6.28's for Pi*2 figuring that's what they represented. I guess I'm stuck moving the pulleys a little at a time in my cad program, re-drawing the tangents, and verifying the belt length until I get it exact. I found this: www.york-ind.com/engineering/center-distance-belt-length/ It states: The approximate center distance can be found by this formula and pretty much gives the exact same formula. If there was a simple formula for this.. I think everyone would be using it
Thank you for the clear explanation and especially making provision for metric. 95% of the world uses metric but not America. Its time those guys woke up to the metric system.
I have a problem, I changed belts three times but they were broken every time. plz uplad a video for adjusting and belt alignment. or belt replacing parameters and balancing method etc.
There is another formula got in youtube. I checked with Ur values it gives same value Length of belt= 2x center distance bet pulleys+1.57(pulley1+pulley2) .
sir can you please make a video on fire fighting design system such as how sprinklers works and how it connected to pumps,calculations. please sir it's request.
Hi, I like the style of your video. Could you explain why you have to multiply the belt length 4 times in the “Centre Distance - Metric” section. And why the 32 x and divide by 16. Thanks
idk about u but for my class i had to get the 30 edition machinery's handbook by Erik Oberg, i think it is around page 2500 where it explains it. It's also nicknamed, " The Bible of the Mechanical Industries"
hello sir, im planning to make a gear pulley but i need to calculate the belt lenght, I have a question is the pulley diameter also a pitch diameter or the outside diameter of the gear pulley?
a little confused how did we do the first imperial belt calculation without knowing the centre distance and vice versa if the formula is needed of each other
This is just a guess but it seems like you would double the distance between the center of the two pulleys and then add half the pi of each pulley. Is that right? But then what do you do for fan belts like on a motor where there are multiple pulleys? My masking tape idea seems like a much better option...
That’s why I came here, seems that plan would only be accurate for pulleys that are nearly the same size. Masking tape is the practical solution though, yes.
After watching this video I decided it was much easier to apply a piece of masking tape around the pulleys, cut it off and measure it. Worked like a charm!
My math skills told me that if I made a mistake and bought the wrong size belt that it would cost me a huge amount of time, effort and gas to go get another belt and only a few cents for the masking tape to be absolutely sure.
HI, great channel! I have a question. Can a pulley system enable a diesels engine gross maximum power to achieve a greater RPM than its rating. For instance, I have a Detroit diesel Series Model 6V-53N/T that is rated at 300 BHP (224 kW) @ 2800 RPM . that is powering a Positive displacement blower , with a maximum RPM of 3000 @ 135 BHP. Would a pulley system be a way of achieving the 3000 RPM at the pump? even though its only rated at 2800. ( 3000 RPM In order to maximize output on the blower) . Is this possible?
yes. you would need a slightly bigger pulley on the motor than the one on the blower. transferring that sort of hp would take a fairly chunky belt though or multiple belts
@@sourabhparit5491 Thank you. However second pulley speed is an unknown and I am going to make custom matched stepped pulleys. I worked out the reverse method of finding the diameter of the second pulley based on belt length, diameter of the first pulley and center distance.
He made a mistake there, forgot to square the unit of length and that's why he ended up with unit/unit=% instead of unit^2/unit=unit. You can't sum up different units, but luckily the numbers he got were right.
Welcome to introduction to mechanical engineering. It’s gets much worse as you progress to certification. My first class assumed you already knew how to calculate algebraic and geometrical given the formulas. Those days may my brain hurt. Never mind when you get to trig an calc.
Not an engineer or such, but had no trouble applying this calculation and method to figure out what size belts more or less I need to replace on my 2 belt bread maker. On opening it up both belts were completely destroyed. Both of varying lengths on a 3 pulley system. Quite chuffed I managed to follow all this and get the 2 belt sizes I need 😀👍
⚠️ Download our Pulley & Belt Calculator ➡️ engineerz.club/Pulley-Calculator
Give us free
What is N and why is is take 3.142
I loooooove color coding. Thanks so much for doing that; it makes my understanding much friendlier.
Thanks Eng.Mindset. Really useful to brush up on something I learned 30 years ago. Consider: Do a screenshot of the implementation in Excel, showing the formula in that format.
Having lived most of my life using imperial formulas and recently needing to work in metric, I find myself loving the metric system more and more. My dear ol Dad said you need to work in both so get used to it. It makes using these formulas so much easier. Great video, did you take pitch into consideration or mainly round/V belt? I may have missed that in the video but I work with timing pulleys and splined pulleys where the pitch usually is larger than the actual pulley diameter.
Thanks for calculating formula...very useful 4me.
Really helped me out, thankyou for such a good presentation
អគុណបង🇰🇭
Thanks for the video, but I think you need to explain how you come to the last part of the first formula (pd2-PD1)² / (4xCD).
My AutoCAD does not agree with you, it is close though 1675.408 vs 1675.167.
Do you know where to find a formula that does it 100% correct ?
I have used the formula to calculate the center to center distance of known belt length, then tried to verify the results with 2 Different CAD Programs, and indeed it is off for me as well. when I apply the center distance between my two pulleys, then draw the belt tangent to the two pulleys, it's off... 740.391mm when I put in 740.000000000 for my belt length. Apparently, this is only an approximation, and not only this formula... but EVERY SINGLE Center distance calculator on-line that I have tried.. they are all off. I even replaced the 6.28's for Pi*2 figuring that's what they represented. I guess I'm stuck moving the pulleys a little at a time in my cad program, re-drawing the tangents, and verifying the belt length until I get it exact.
I found this:
www.york-ind.com/engineering/center-distance-belt-length/
It states: The approximate center distance can be found by this formula
and pretty much gives the exact same formula.
If there was a simple formula for this.. I think everyone would be using it
It's because the formula they are using is derived using the small angles approximation (for angles
Wow that's why I'm proud of you being my engineer lecturer
Thank you for the clear explanation and especially making provision for metric. 95% of the world uses metric but not America. Its time those guys woke up to the metric system.
I'm American,
And agree with this comment 100%..🍻🍻
We woke up and chose to implement metric in 1975.
Imperial was used before metric became a thing.
If I use tensioner wheel between two pulley then what is the formulae for calculating the length of belt ?
Kindly reply ASAP because its urgent
U r just awesome paul
Thank you
I have a problem, I changed belts three times but they were broken every time. plz uplad a video for adjusting and belt alignment. or belt replacing parameters and balancing method etc.
There is another formula got in youtube. I checked with Ur values it gives same value
Length of belt= 2x center distance bet pulleys+1.57(pulley1+pulley2) .
sir can you please make a video on fire fighting design system such as how sprinklers works and how it connected to pumps,calculations. please sir it's request.
Hi, I like the style of your video. Could you explain why you have to multiply the belt length 4 times in the “Centre Distance - Metric” section. And why the 32 x and divide by 16. Thanks
Is the pulley diameter taken from the rim or the bottom of the V groove?
Hi. Thanks alot for the calculation. Can you recommend a book that treats this topic? Thanks alot in advance
idk about u but for my class i had to get the 30 edition machinery's handbook by Erik Oberg, i think it is around page 2500 where it explains it. It's also nicknamed, " The Bible of the Mechanical Industries"
Hi pls tell me the calculation of Flow rate of Centrifugal fan and Axial flow fan
Thanks
Helpful
Hello sir
Why belt drive is more preferred arrangements for HAVAC SYSTEM
What are the design calculations of ratchet wheel?
hello sir, im planning to make a gear pulley but i need to calculate the belt lenght, I have a question is the pulley diameter also a pitch diameter or the outside diameter of the gear pulley?
a little confused
how did we do the first imperial belt calculation without knowing the centre distance and vice versa if the formula is needed of each other
You need to know one of the values or assume and reiterate your answers.
C-c Length x 2 + half circumference of each pulley. Way easier approach
how much the car serpenine belt needs to cover the pulley suface in order to rotate it 100%? is it 20% minium or more?
This is just a guess but it seems like you would double the distance between the center of the two pulleys and then add half the pi of each pulley. Is that right? But then what do you do for fan belts like on a motor where there are multiple pulleys? My masking tape idea seems like a much better option...
That’s why I came here, seems that plan would only be accurate for pulleys that are nearly the same size. Masking tape is the practical solution though, yes.
I FIND THIS EXACTLY THE DAY AFTER MY EXAM
After watching this video I decided it was much easier to apply a piece of masking tape around the pulleys, cut it off and measure it. Worked like a charm!
Of course It works, but it's not very elegant. And how are you going to ahow off your math skills that way?
@@naverilllang I was always horrible at math until you put a dollar sign in front of it and then I all of a sudden become an expert!
My math skills told me that if I made a mistake and bought the wrong size belt that it would cost me a huge amount of time, effort and gas to go get another belt and only a few cents for the masking tape to be absolutely sure.
How to calculate for 3 belt pulley. If 2 are at same size and aligned with each other and larger one is at some distance from them ?
Why does the formula include 4x the center to center distance ???
2:56 magic
Sir can u explain how these formulas came from..... it would help in memorizing..
Thanks for videos ...
can just ask suppliers of the equipment they provide all
Shouldnt the ( -100 mm )^2 get to be 10,000 mm^2
HI, great channel! I have a question. Can a pulley system enable a diesels engine gross maximum power to achieve a greater RPM than its rating. For instance, I have a Detroit diesel Series Model 6V-53N/T that is rated at 300 BHP (224 kW) @ 2800 RPM . that is powering a Positive displacement blower , with a maximum RPM of 3000 @ 135 BHP. Would a pulley system be a way of achieving the 3000 RPM at the pump? even though its only rated at 2800. ( 3000 RPM In order to maximize output on the blower) . Is this possible?
yes. you would need a slightly bigger pulley on the motor than the one on the blower. transferring that sort of hp would take a fairly chunky belt though or multiple belts
clear as mud
How would one calculate the diameter of a second pulley when the belt length, center distance and the first pulley diameter are known?
By considering speed of motor and speed you want toa achieve.
N1/N2=D2/D1. N is speed
@@sourabhparit5491 Thank you. However second pulley speed is an unknown and I am going to make custom matched stepped pulleys. I worked out the reverse method of finding the diameter of the second pulley based on belt length, diameter of the first pulley and center distance.
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What if you have three puleys like a tensioner?
I would assume you can get close by taking half of the answer for each of the 3 center-to-center measurements.
Unit stays same... In the 3rd line upper unit becomes mm^2 and then stays mm....
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Why does belt length have to be specific. Isn't the pulleys not touching good enough?
if you knew already the belt length,why need to know the C-C of the pulley?
4 pulley heto kaise belt size find kare
Add in Hindi video sir
Hindi channel now live! ua-cam.com/video/j7dlywCbjF0/v-deo.html
Just get the old one and buy a new one the same size 👍
I call it American measures vs. Whoever has no flag on the moon
Apollo moon mission guidance computers used metric SI units for calculations, with readouts in miles / feet.
Low voice,can not hear 😂😂😂
L
You lost me at going from adding the length to a percentage... huh?
That's ok, just rewind, pause and think it through. We had to learn everything from scratch and one day you'll forget you didn't even know this.
He made a mistake there, forgot to square the unit of length and that's why he ended up with unit/unit=% instead of unit^2/unit=unit. You can't sum up different units, but luckily the numbers he got were right.
To bad he didn’t actually run through the calculation great that he showed the string but didn’t actually do it in video
Mike Craft the numbers in the formulas and string are colour coded, you should be able to follow it through
Welcome to introduction to mechanical engineering. It’s gets much worse as you progress to certification. My first class assumed you already knew how to calculate algebraic and geometrical given the formulas. Those days may my brain hurt. Never mind when you get to trig an calc.
Not an engineer or such, but had no trouble applying this calculation and method to figure out what size belts more or less I need to replace on my 2 belt bread maker. On opening it up both belts were completely destroyed. Both of varying lengths on a 3 pulley system. Quite chuffed I managed to follow all this and get the 2 belt sizes I need 😀👍
Only listen. Can’t read
Turn your phone sideways so it's larger