Hi Dave, Thank you again for this, you are very generous in sharing this content. I am trying to create a mass monitor spreadsheet, that includes mass, center of gravity values and PTC common names, however, the mass properties dialogue does not allow you to do that. I tried building a repeat region table, but it only exports the local center of gravity values. Do you know how can I get around this?
Hi Dave, Is it possible to measure the combined centre of gravity for multiple parts inside an assembly? For example, the beam and the tank of the assembly you showed at the start of the video.
When you calculate mass properties in an assembly, it gives you the combined center of gravity. If you want the CG of a subset of components, create a Simplified Rep.
Hi Dave...Do you know how to make cutting list of piping using sweep command? or how to generate the total length using sweep command in parts.? Thank you:)
So if we are using sweep command there is no way to generate the cutting lenght table right? We are going to use sweep command since the piping module did not allow us to reuse the part that we are already created..we were going to implement part numbering system....
I’m not saying that. You asked if I knew how to create those tables using the sweep command. I don’t. I didn’t say it was impossible. I don’t know if it’s possible. I know the Piping module, so that’s how I do it.
Hi Dave, I have a question. I am designing some aluminum (6061 AL) parts. I am confused about the mass that creo calculates. The mass i get is in lbm. I know that to convert mass to weight you must multiply by gravity ; when i multiply by 32.2, the answer that I get is too large. Is the "mass" that creo calculates actually weight? If i had the parts on hand and i put them on a scale, would the weight i get be the mass that creo calculates?
What unit system does your model use? Are your length units in inches? What is the calculated volume? What are you using for the density (value and units)?
@@CADPLMGuy Thanks for the quick reply. my units are inch lb seconds. lengths are in inches. my density is 9.79e^-02 lbm/in3. my volume is 4.59e+01 in3. the mass it calculated was 4.5 lbm.
@@CADPLMGuy I also tried it with part of another model ( i know it definitely weighs less than 7lbs). For this one the units are the same as my previous reply (inch lbm seconds ). The density they use is 9.791206 e-2 lbm/in3. the volume is 8.79468 in3 and the mass is 3.167828 lbm. This mass seems reasonable for the weight of the model. Also if i multiply the density and volume they are using to get mass i dont get their mass value ( instead i get 11.65379lbm). If i were to multiply their mass by 32.2 to get lbf it would be too much ( 102 lbm). I am confused.
@@katcam7993 I took a look at the math using PTC Mathcad Prime and it's correct. Here's the thing, and this always gives me a headache: when you multiply pounds-mass by the acceleration due to gravity, the numerical value for the weight is the same. You can't just multiply by 32.2 - actually it would be 386.4 for g in inches. You have to multiply pounds-mass by g in inches per second squared. Then the numbers turn out to be equal. A mass of 4.477 pounds-mass has a weight of 4.477 pounds-force. Bottom line, pounds-mass and pounds-force suck.
Thank you, Dave
Thanks, Volodymyr! I appreciate that.
Hi Dave,
Thank you again for this, you are very generous in sharing this content.
I am trying to create a mass monitor spreadsheet, that includes mass, center of gravity values and PTC common names, however, the mass properties dialogue does not allow you to do that. I tried building a repeat region table, but it only exports the local center of gravity values. Do you know how can I get around this?
Hi Dave,
Is it possible to measure the combined centre of gravity for multiple parts inside an assembly?
For example, the beam and the tank of the assembly you showed at the start of the video.
When you calculate mass properties in an assembly, it gives you the combined center of gravity. If you want the CG of a subset of components, create a Simplified Rep.
how to get the weight of whole instance of family table? How to set up relation to calculate the paint needed for the instances?
Have you watched my Family Table and BOM videos?
Hi Dave, how to calculate whole mass/weight of the assembly?
The same way.
Hi Dave...Do you know how to make cutting list of piping using sweep command? or how to generate the total length using sweep command in parts.? Thank you:)
Are you talking about a cut length table? Using the Sweep command, no. But eventually I’ll have a video on how to do that in Piping mode.
So if we are using sweep command there is no way to generate the cutting lenght table right? We are going to use sweep command since the piping module did not allow us to reuse the part that we are already created..we were going to implement part numbering system....
I’m not saying that. You asked if I knew how to create those tables using the sweep command. I don’t. I didn’t say it was impossible. I don’t know if it’s possible. I know the Piping module, so that’s how I do it.
PLS what does that +06 +03 etc at the end of mass value mean??
Scientific notation. 03 for thousands, 06 for millions, etc.
Hi Dave, I have a question. I am designing some aluminum (6061 AL) parts. I am confused about the mass that creo calculates. The mass i get is in lbm. I know that to convert mass to weight you must multiply by gravity ; when i multiply by 32.2, the answer that I get is too large. Is the "mass" that creo calculates actually weight? If i had the parts on hand and i put them on a scale, would the weight i get be the mass that creo calculates?
What unit system does your model use? Are your length units in inches? What is the calculated volume? What are you using for the density (value and units)?
@@CADPLMGuy Thanks for the quick reply. my units are inch lb seconds. lengths are in inches. my density is 9.79e^-02 lbm/in3. my volume is 4.59e+01 in3. the mass it calculated was 4.5 lbm.
@@CADPLMGuy I also tried it with part of another model ( i know it definitely weighs less than 7lbs). For this one the units are the same as my previous reply (inch lbm seconds ). The density they use is 9.791206 e-2 lbm/in3. the volume is 8.79468 in3 and the mass is 3.167828 lbm. This mass seems reasonable for the weight of the model. Also if i multiply the density and volume they are using to get mass i dont get their mass value ( instead i get 11.65379lbm). If i were to multiply their mass by 32.2 to get lbf it would be too much ( 102 lbm). I am confused.
@@katcam7993 I took a look at the math using PTC Mathcad Prime and it's correct. Here's the thing, and this always gives me a headache: when you multiply pounds-mass by the acceleration due to gravity, the numerical value for the weight is the same. You can't just multiply by 32.2 - actually it would be 386.4 for g in inches. You have to multiply pounds-mass by g in inches per second squared. Then the numbers turn out to be equal. A mass of 4.477 pounds-mass has a weight of 4.477 pounds-force. Bottom line, pounds-mass and pounds-force suck.
@@katcam7993 32.2 is acceleration due to gravity in feet per second squared. You shouldn't be using that.