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  1. delimashare

    Gear Design

    Hi Desertfox, I followed your instructions to calculate the torque on the operating shaft.Suppose the Torque on the operating shaft was (Z).How do I calculate the force to be applied on the handle? Regards, delimashare
  2. delimashare

    Gear Design

    Hi desertfox, I was in a vacation and had no chance to check what you have sent me.Now I'm back to work and will do that soon. Thank you so much. delimashare
  3. delimashare

    Gear Design

    Thanks desertfox, I really appreciate that. delimashare
  4. delimashare

    Gear Design

    Hi all, Thanks desertfox I have a simple question here.Is the torque constant all through the system?I'm really confused. delimashare
  5. delimashare

    Gear Design

    Hi All, desertfox,Thank You so much for you time and help. 1)The Linkage is welded to the gear and rotated by applying the force on the linkage itself. That's why I considered the linkage length to estimate the torque on the gear? If this is wrong what would be the force on the linkage(L1) on...
  6. delimashare

    Gear Design

    Another Try delimasharehttp://files.engineering.com/getfile.aspx?folder=3361fd89-7921-4ae8-9817-551f8bc36ac8&file=GEAR1_FORCES.pdf
  7. delimashare

    Gear Design

    Hi All, MechEng2005 , Sorry I have just noticed that the files are not working for you too. Anybody knows the reason? I'm uploading the files in the same way I used to do it before.But it is not working.! Regards delimashare
  8. delimashare

    Gear Design

    Hi desertfox, It seems that the file is not working for me either.Here I attach it again in Autocad 2004.Hope it will work this time. Thanks delimasharehttp://files.engineering.com/getfile.aspx?folder=d33ed5ef-8bcf-40b3-b4b2-b36533bcb183&file=Gear1+Force.dwg
  9. delimashare

    Gear Design

    Hi desertfox,, Sorry for that .I don't know what the problem is.Here is the file again. Thanks delimasharehttp://files.engineering.com/getfile.aspx?folder=3e8e999e-96d3-4436-bea9-514e726554a0&file=GEAR1+FORCES.pdf
  10. delimashare

    Gear Design

    Hi all, and thank you so much desertfox. I still need some help in analysing the forces and torques.Please see attached a pdf dwg. on which I show how I worked on this.I also put my question on the same drawing,to make it easier to follow up. Regards, delimashare...
  11. delimashare

    Gear Design

    Hi, I'm calculating the diameter of the shaft using the formula: Tmax=(pi/16)x sheer stress x ((D4-d4)/D) T is torque sheer stress varies acc. to material used D is outside diameter of shaft d is inside diameter of shaft I don't know where to apply polar moment of inertia here? Regarding my...
  12. delimashare

    Gear Design

    Thank you desertfox, I worked backwards and did my calculations to find the operator force needed.I assumed that the force on the G1 (horizontally in the direction of chain)is equal to the force on G2 in the same direction.Is that correct?My estimated force was less than 250N in the worst...
  13. delimashare

    Gear Design

    Hi everybody, thanks desertfox, Here I continue, In order to operate the gear,an L shape handle of 20"x6"is used. The short side is inserted inside a nozzle at the gear closure door in order to operate the gear,and the 250N force is applied on the long side. Now, Can we calculate the force on...
  14. delimashare

    Gear Design

    Thank you desertfox. I'm not sure if I understand you.Which part is the handle? I assume it is the bar that the operating man uses manually to operate the switchgear. So we have to apply 250N-450N on this bar? How do we measure the force applied?And how do we estimate the force on the gears...
  15. delimashare

    Gear Design

    Thank you .Here I attach the drawing as pdf file. Hope this will work. Regards, Delimasharehttp://files.engineering.com/getfile.aspx?folder=ac32e0c1-cfc0-4773-8ea6-40e5de57b1aa&file=Gear1.pdf
  16. delimashare

    Gear Design

    Hi Everybody, I have to design 3 gear assemblies which run a switchgear inside an enclosure. Here I attach a drawing for one gear only(for a similar project). I have to do my calculations and select the diameter, length, cross section, material...etc. for the linkages, shafts, axles, chains...
  17. delimashare

    gear design

    Hi Everybody, I posted a question about gear design on a physics forum,unfortunately I didn't get any reply. Here is my question: I have to design 3 gear assemblies which run a switchgear inside an enclosure. Here I attach a drawing for one gear only(for a similar project). I have to do my...
  18. delimashare

    fan selection based on static pressure

    Thank you ChasBean1 I will calculate and come up with real figures. Please What do you mean by (heat loads) in your sentence (Size your supply to meet heat loads and fresh air ...) .The pressurizing fan here is A SEPARATE fan; it not the HVAC fan. Do I understand you correctly? ChasBean1 ...
  19. delimashare

    fan selection based on static pressure

    Thank you all very much. ChasBean1. I understand that leakage has the biggest effect on pressure . I am not sizing the fan based on p1v1=p2v2. I just don't want to miss anything in my calculations. No matter how small it is. walkes ,KiwiMace, Zesti. The application of BLOWER DOOR TEST and...
  20. delimashare

    fan selection based on static pressure

    ...sure if I understand your point about allowing 1-2 air changes/hr as a difference between supply and extraction. Let’s calculate 2air changes/hr * 1500ft3(room volume) =3000ft3/hr. So, based on existing EQUAL supply and exhaust in the building, the capacity of our pressurization fan should...

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