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  1. Ivan Silva

    Twin screw extruder modelling

    I'm currently trying to reverse engineering an 3d scanned based screw model. The profile section cut are pretty straightfoward to model but I have no idea how to model the transaction between two diferent cross-sections with different pitches in an smoth way. Someone have ever experience to...
  2. Ivan Silva

    Stainless storage tank fabrication

    I recently was moved on to a project which demands to reverse engineering an tank in order to fabricate another equal ones. Until now I had only worked with automation machines so I’m quite inexperience with tank fabrication so I have some question about it. The tank main body has 700 mm...
  3. Ivan Silva

    Power required in roller chain conveyor

    As the title says, I'm trying to evalute the amount of power needed in roller chain conveyor. I know there is engineering manuals regarding this calculation although it mostly aimed to grain/mining bucket conveyors but in my case it's not an grain it's biscuits and the manner the biscuits are...
  4. Ivan Silva

    Selecting pipe diameter and vacuum pump

    Yep you are right 3DDave! My lack of knowledge in vaccum system made me make an mistake. Since the start of this discussion what I want was to size an blower fan not vaccum pump (I thougt it was the same thing) and yes this gantry works with a boxes (I call it vaccum box) in which suctions cups...
  5. Ivan Silva

    Selecting pipe diameter and vacuum pump

    Compositepro, Yep this ejector vaccum type are quite versitable but demains a lot from the pneumatic compressor especially when you have 112 vaccum pumps to suply. But the problem doesn't stops here the product has a lot of suggar grains and flour so the this ejector vaccum pumps would be...
  6. Ivan Silva

    Selecting pipe diameter and vacuum pump

    georgeverghese, thanks for your time to awnser my question! From the first batch to the next batch the process takes up to 8 secs but mostly of it the suction cups are been actuated, in fact only in the last 3,5 sec the suction cups are not been actuated. So in this case xx = 3.5 sec. Taking by...
  7. Ivan Silva

    Selecting pipe diameter and vacuum pump

    I'm finishing the mechanical design which lay down on the project and I'll talk with vaccum system supliers but I would like to understand the physics behind this system.
  8. Ivan Silva

    Selecting pipe diameter and vacuum pump

    Yep
  9. Ivan Silva

    Selecting pipe diameter and vacuum pump

    Thank you, Dave! That will help me a lot. Little, I mistyped it's -40 kPa
  10. Ivan Silva

    Selecting pipe diameter and vacuum pump

    I know all that parameters are necessarily in order to size the pump what I asked for is some sort of source containing tables and formulas which would guide me towards the suitable vacuum pump. But since you bring all that questions here we go: All the suction cups will operate at the same...
  11. Ivan Silva

    Selecting pipe diameter and vacuum pump

    That's not what I asked for.
  12. Ivan Silva

    Selecting pipe diameter and vacuum pump

    I have an application where I need to operate 112 suction cups and I need to know the suitable pipe diameter (All the suction cups are conect to a single main pipe, that’s the pipe I want to calculate) as well as the right size of the vaccum pump according to the time per cycle time I have. I...
  13. Ivan Silva

    Location tolerance exercises

    @greenimi “ Everything I Needed to Know About Geometric Dimensioning and Tolerancing I Learned from My Dog” By Dave Slopsema
  14. Ivan Silva

    Location tolerance exercises

    Hello, I'm solving some question about position tolerance from a book and there are two of them which I didn't understand what is wrong with my resolution. Could someone help me with it? Picture for question 69 and 70: 69. The perpendicularity callout and this tolerance of position callout...
  15. Ivan Silva

    Appropiate MMB boundary

    @SeasonLee I just finish the reading of the topic you suggest. It was enlightening. About the Drafting Zone website is it down or the hosts only changed it's domain?
  16. Ivan Silva

    Appropiate MMB boundary

    Now I got it. Thank boys. About the diameter on position tolerance zone I think it was missed. About the book it’s from Dave Slopsema who hosts the dimensional consulting web site.
  17. Ivan Silva

    Appropiate MMB boundary

    The ASME Y14.5 - 2018 says some words about choosing the appropiated MMB boundary: "7.11.6 The appropriate MMB for determining the size of the true geometric counterpart for an external datum feature(s) of size is the smallest MMB that can contain the datum feature(s) of size while respecting...
  18. Ivan Silva

    Cons of zero tolerancing at MMC

    A good example Belanger. Thank you! Another good example that just come into my mind is when you have maybe three mating parts, a flat piece with hole where an pin must fit and then an small ring which fits the pin. Maybe for the pin manufacturing process the usage of zero tolerancing at MMC...
  19. Ivan Silva

    Cons of zero tolerancing at MMC

    Hello! Today I was presented to the concept of zero tolerancing at MMC on postion tolerance. I quite understood how it works but couldn't understood why it's not so used in industry. For me, it ALWAYS has more benefit than using the MMC plus any tolerance since the virtual condition doesn't...
  20. Ivan Silva

    Lubrification on sprocket gear

    @Tmoose Sorry I forgot this information... The initial ideia is a automatic and continuos device (Grip Lubrication). @3DDave Very funny! Thank you for sharing your knowledge and time with me.

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