Don’t know if you’re still active on here but thank you for these videos, this is the most detailed videos on this subject on UA-cam, as a 24 y/o maintenance mechanic trying to learn as much as i can as fast as i can thank you. i hope to be of your skill and knowledge level one day
Flamer- Thank you for the kind words. Yes we are still here despite the fact that UA-cam no longer pays us for the advertising. We don't plan on removing these videos because of people like you. Thank you for your interest. John Piotrowski.
The very Best Alignment Tutorial I have ever watched. It's full of practical advises and tit-bits that are very helpful. The tutorial on soft foot simply blew me away! Thanks Engr. John. Thank you so much.
Words can't describe how I feel, thank you Mr.John Piotrowski for this amazing tutorials which peresented in a simple informative way, you sir a true genuis, I am looking forward to check out the rest of tutorials, hopefuly the rest of tutorials will be affordable especialy for people from low income countries, agian thank you sir, best regards
Thank you so very much for the kind words. I hope that this information has helped you. We are hoping that the remaining tutorials will be available in the next few weeks. Thank you for your interest. John Piotrowski
Muhammed: Great question. Shafts that are supported in journal bearings (a.k.a. sleeve, babbitt, plain, hydrodynamic, bushing), require a certain amount of clearance for the lubricant to get between the shaft and the bearing when the shaft is rotating. This clearance is typically 1 mil per inch (1 micrometer/mm) of clearance. For example, a 6 inch diameter shaft would have about 6 mils (0.006") of clearance. Assuming that the shaft is horizontally mounted, once the shaft gets up to speed, the shaft does indeed lift up on a thin film of lubricant but the film thickness only ranges between 0.5 - 1 mil (0.0005" - 0.0010"). The shaft is not going to automatically center itself inside the bore of the bearing because it needs a film of lubricant to run on. If both shafts on a two element drive system have journal bearings, the they both would lift up about the same amount making the oil film thickness a non-issue. If one machine is supported in journal bearings and the other shaft is supported in rolling element bearings, then you could set the shaft supported in journal bearings about 0.5 - 1 mil lower to compensate for it but that's almost not worth worrying about. Thanks for your interest! John Piotrowski 3/30/2020
Carlos: For horizontally mounted shafts, typically the side (horizontal) readings are the same so they cancel each other out. Sag only affects the top and bottom (vertical) readings. For example, if you were using a bracket that had 10 mils of sag, when you check the sag, there would be 5 mils of sag on both side readings.
@@shaftalignment6105 I have another question, why divide they SAG value by two when using the reverse dial method, and when using rim and face method the SAG value is the complete value?
@@carlosaguilar4505 Carlos: For horizontally mounted shafts, when using mechanical brackets and dial indicators, the amount of "sag" that occurs from the 12 o'clock to 6 o'clock reading is being affected by gravity which needs to be compensated for when aligning your machinery. For example, if you had a bracket and indicator arrangement where you had 10 mils (-10) of bracket sag from the 12 o'clock to 6 o'clock measurements and you saw -40 mils for your bottom reading, 10 mils of that -40 is due to the "sag" in the bracket. If you would have had a "perfect" bracket that had no sag at all , you would have only measured -30 for your bottom reading, not -40. Why? Because 10 mils of the -40 reading is due to the sag in the bracket. To compensate the bottom reading for sag, regardless of whether it is a rim or a face reading, you subtract the amount of sag to the bottom rim or face reading. Sag also has an effect on the "side" readings and it is typically symmetric where the effect of the sag for the side readings is HALF of the amount you observed from the 12 o'clock to 6 o'clock position. This is true for any rim or face measurement and it's true regardless of whether you are using the Reverse Indicator, Face-Rim, Double Radial, Shaft to Coupling Spool, or Face-Face methods. Thanks for your interest! I hope I answered your question.
@@shaftalignment6105 thank you Mr. John, i have one more question, why in your book, specifically in the reverse dial method, You take it the readings in both dials at six o'clock? Thanks for your attention
Sushant: You would rotate one shaft at a time. This will reduce any errors as each shaft is now going to rotate in it's own bearing where there will be no influence from shaft to shaft across the coupling where either shaft would impart static forces that would potentially elastically bend the shafts.
Why do you use the whole reading instead of using half the reading. It seems like you will still have the same problem if you use the whole reading. So if you zero your indicator on top then roll it to the bottom and get - .012 then when you put a +.012 on top and roll it to the bottom you will get zero, correct. It seems to me that you will still be out , why do you not take half of the sag and start with a +.006.
So shouldn't it be TIR divided by 2 = SAG . The indicator bar will sag away from the pipe and the indicator reading will be twice the actual bar sag. Gravity works in both ways.
Damon - What you are trying to do is to determine what measurement you would have got with a mechanical bracket that has no "sag". My suggestion is to first set up your alignment brackets and indicator(s) onto the drive system you are trying to align. When you do that, you don't yet know what diameter shaft you are clamping onto, what the height of the span bar needs to be off the contact surface, how far you need to span from one shaft to the other, and what dial indicator(s) you are going to attach to the end of the span bar. Once you get your actual "filed readings", you can then remove the bracket and indicators, set them up on your sag check bar (or pipe), measure how much sag you have, then compensate for it mathematically. Indeed, if you knew exactly how you needed to set up your tooling beforehand, then you could dial in a +12 at the top, sweep to the bottom and get the "sag compensated " bottom reading.
The Basic, Intermediate, and Advanced tutorials will eventually be put on UA-cam as Pay Per View (PPV) tutorials. I think we need to get to 40K views and / or 1000 subscribers before UA-cam will allow PPV.
@@shaftalignment6105 All the tutorials were very helpful As described in your vibration and alignment tutorials can you upload the video describing the spectrum and misalignment. Also it will be great helpful if you could upload detailed videos for each precious shaft alignment methods
Don: As you may have noticed in the reply to Ashish two years ago, our plan was to put the remaining Basic, Intermediate, and Advanced shaft alignment training tutorials on You Tube on a PPV basis through the "Red" channel. That no longer exists. We are trying to figure out how to get the remaining tutorials onto some sort of PPV site. The tutorial on "describing the spectrum and misalignment" is one of the Advanced tutorials. The explanation on how to makes sense of the measurements taken for each of the "precious shaft alignment methods" are in the Basic and Intermediate tutorials series. As you can imagine, the training tutorials take a considerable amount of time to develop. On average it takes about eight hours to produce each hour of video. It would be nice to get reimbursed for the time to produce 22 total hours of time for the 31 video tutorials in the Introductory, Basic, Intermediate, and Advanced tutorials. Until that happens, the best way to get this information is to attend one of our training course! Thank you for watching and I hope these Introductory tutorials have helped you. John Piotrowski
@@shaftalignment6105 how can we attend the intermediate and advance training courses, and it will be good if you give us the average of every course cost, thank you in advance
@@akramalrazihi3037 Akram: We are currently in negotiations with a company to begin offering the Basic, Intermediate, and Advanced shaft alignment tutorials on either a Pay Per View (PPV) or Pay To View (PTV) system. Hopefully our efforts to get all 31 tutorials available for viewing will be successful.
Don’t know if you’re still active on here but thank you for these videos, this is the most detailed videos on this subject on UA-cam, as a 24 y/o maintenance mechanic trying to learn as much as i can as fast as i can thank you. i hope to be of your skill and knowledge level one day
Flamer- Thank you for the kind words. Yes we are still here despite the fact that UA-cam no longer pays us for the advertising. We don't plan on removing these videos because of people like you. Thank you for your interest. John Piotrowski.
The very Best Alignment Tutorial I have ever watched. It's full of practical advises and tit-bits that are very helpful. The tutorial on soft foot simply blew me away! Thanks Engr. John. Thank you so much.
Darkland Curious: Thank you for the kinds words. I hope that this information will help with your rotating machinery. John Piotrowski
Words can't describe how I feel, thank you Mr.John Piotrowski for this amazing tutorials which peresented in a simple informative way, you sir a true genuis, I am looking forward to check out the rest of tutorials, hopefuly the rest of tutorials will be affordable especialy for people from low income countries, agian thank you sir, best regards
Thank you so very much for the kind words. I hope that this information has helped you. We are hoping that the remaining tutorials will be available in the next few weeks. Thank you for your interest. John Piotrowski
@@shaftalignment6105 Alright Sir, could you please make an announcement when they avaliable.
I downloaded all tutorials it very useful, thank you engineer john
Tahseen, I hope these tutorials are helpful. Thank you for the kind comment! John Piotrowski
thank you for more thought provoking videos.great work.Andy Haslam
I appreciate the kind words, Andy. John Piotrowski
Hola tiene nivel intermedio? Videos grabados para poder acceder?
Mr.John what about lift check of the bearings radial clearance ?
Muhammed: Great question. Shafts that are supported in journal bearings (a.k.a. sleeve, babbitt, plain, hydrodynamic, bushing), require a certain amount of clearance for the lubricant to get between the shaft and the bearing when the shaft is rotating. This clearance is typically 1 mil per inch (1 micrometer/mm) of clearance. For example, a 6 inch diameter shaft would have about 6 mils (0.006") of clearance. Assuming that the shaft is horizontally mounted, once the shaft gets up to speed, the shaft does indeed lift up on a thin film of lubricant but the film thickness only ranges between 0.5 - 1 mil (0.0005" - 0.0010"). The shaft is not going to automatically center itself inside the bore of the bearing because it needs a film of lubricant to run on. If both shafts on a two element drive system have journal bearings, the they both would lift up about the same amount making the oil film thickness a non-issue. If one machine is supported in journal bearings and the other shaft is supported in rolling element bearings, then you could set the shaft supported in journal bearings about 0.5 - 1 mil lower to compensate for it but that's almost not worth worrying about.
Thanks for your interest!
John Piotrowski 3/30/2020
Why SAG affects the horizontal readings?
Carlos: For horizontally mounted shafts, typically the side (horizontal) readings are the same so they cancel each other out. Sag only affects the top and bottom (vertical) readings. For example, if you were using a bracket that had 10 mils of sag, when you check the sag, there would be 5 mils of sag on both side readings.
@@shaftalignment6105 I have another question, why divide they SAG value by two when using the reverse dial method, and when using rim and face method the SAG value is the complete value?
@@carlosaguilar4505 Carlos: For horizontally mounted shafts, when using mechanical brackets and dial indicators, the amount of "sag" that occurs from the 12 o'clock to 6 o'clock reading is being affected by gravity which needs to be compensated for when aligning your machinery. For example, if you had a bracket and indicator arrangement where you had 10 mils (-10) of bracket sag from the 12 o'clock to 6 o'clock measurements and you saw -40 mils for your bottom reading, 10 mils of that -40 is due to the "sag" in the bracket. If you would have had a "perfect" bracket that had no sag at all , you would have only measured -30 for your bottom reading, not -40. Why? Because 10 mils of the -40 reading is due to the sag in the bracket. To compensate the bottom reading for sag, regardless of whether it is a rim or a face reading, you subtract the amount of sag to the bottom rim or face reading. Sag also has an effect on the "side" readings and it is typically symmetric where the effect of the sag for the side readings is HALF of the amount you observed from the 12 o'clock to 6 o'clock position. This is true for any rim or face measurement and it's true regardless of whether you are using the Reverse Indicator, Face-Rim, Double Radial, Shaft to Coupling Spool, or Face-Face methods. Thanks for your interest! I hope I answered your question.
@@shaftalignment6105 thank you Mr. John, i have one more question, why in your book, specifically in the reverse dial method, You take it the readings in both dials at six o'clock?
Thanks for your attention
How will we rotate both the shafts if the coupling is removed?
Will it not create more errors?
Sushant: You would rotate one shaft at a time. This will reduce any errors as each shaft is now going to rotate in it's own bearing where there will be no influence from shaft to shaft across the coupling where either shaft would impart static forces that would potentially elastically bend the shafts.
Thank you Mr. Piotrowski. I am waiting for your PPV videos.
Why do you use the whole reading instead of using half the reading. It seems like you will still have the same problem if you use the whole reading. So if you zero your indicator on top then roll it to the bottom and get - .012 then when you put a +.012 on top and roll it to the bottom you will get zero, correct. It seems to me that you will still be out , why do you not take half of the sag and start with a +.006.
So shouldn't it be TIR divided by 2 = SAG . The indicator bar will sag away from the pipe and the indicator reading will be twice the actual bar sag. Gravity works in both ways.
Damon - What you are trying to do is to determine what measurement you would have got with a mechanical bracket that has no "sag". My suggestion is to first set up your alignment brackets and indicator(s) onto the drive system you are trying to align. When you do that, you don't yet know what diameter shaft you are clamping onto, what the height of the span bar needs to be off the contact surface, how far you need to span from one shaft to the other, and what dial indicator(s) you are going to attach to the end of the span bar. Once you get your actual "filed readings", you can then remove the bracket and indicators, set them up on your sag check bar (or pipe), measure how much sag you have, then compensate for it mathematically. Indeed, if you knew exactly how you needed to set up your tooling beforehand, then you could dial in a +12 at the top, sweep to the bottom and get the "sag compensated " bottom reading.
when next set of tutorials will be updated
The Basic, Intermediate, and Advanced tutorials will eventually be put on UA-cam as Pay Per View (PPV) tutorials. I think we need to get to 40K views and / or 1000 subscribers before UA-cam will allow PPV.
@@shaftalignment6105 All the tutorials were very helpful
As described in your vibration and alignment tutorials can you upload the video describing the spectrum and misalignment.
Also it will be great helpful if you could upload detailed videos for each precious shaft alignment methods
Don: As you may have noticed in the reply to Ashish two years ago, our plan was to put the remaining Basic, Intermediate, and Advanced shaft alignment training tutorials on You Tube on a PPV basis through the "Red" channel. That no longer exists. We are trying to figure out how to get the remaining tutorials onto some sort of PPV site. The tutorial on "describing the spectrum and misalignment" is one of the Advanced tutorials. The explanation on how to makes sense of the measurements taken for each of the "precious shaft alignment methods" are in the Basic and Intermediate tutorials series. As you can imagine, the training tutorials take a considerable amount of time to develop. On average it takes about eight hours to produce each hour of video. It would be nice to get reimbursed for the time to produce 22 total hours of time for the 31 video tutorials in the Introductory, Basic, Intermediate, and Advanced tutorials. Until that happens, the best way to get this information is to attend one of our training course! Thank you for watching and I hope these Introductory tutorials have helped you. John Piotrowski
@@shaftalignment6105 how can we attend the intermediate and advance training courses, and it will be good if you give us the average of every course cost,
thank you in advance
@@akramalrazihi3037 Akram: We are currently in negotiations with a company to begin offering the Basic, Intermediate, and Advanced shaft alignment tutorials on either a Pay Per View (PPV) or Pay To View (PTV) system. Hopefully our efforts to get all 31 tutorials available for viewing will be successful.
..i downloaded all tutorials.. ..i want to learn all of these.. ..thank you..
Eduard - Thank you for your interest! John Piotrowski
Hindi me bhi video banaya karo sir