Results 1 to 10 of 10

Thread: Mechanical Engineering Gurus?

  1. #1
    Forum User verified Feedback Score 1 (100%)
    Join Date
    Sep 2010
    Owner Since
    August 2003

    Location
    Uniontown
    Posts
    483
    Thanks
    3
    Thanked 11 Times in 10 Posts

    Mechanical Engineering Gurus?

    Ok, I think I am correct in thinking and function, but I would like some help to make sure I am right.

    I have two gears. One gear is 6" in diameter. One is 2" in diameter. The 6" gear is driven at 300 RPM.

    The 2" gear is not driven by the 6" gear. Instead I have a 2" gear on the 6", connecting it to said 2" gear via chain.

    The 6" gear and the adjacent 2" gear have three points, each located at 120 degrees.

    Since the 6 and 2 are connected by a seperate 2" gear. The 6" gear and the adjacent 2" gear(driven by the 2" that is on the 6") will rotate the same direction, at 300 rpm each, and will have the ability to match the three points every time because the drive ratio for the 2" gear is a 1:1.

    And even if they were some hair brained sizes like 5.387 and 1.276, as long as the connecting gear was even they would still turn the same rate and direction.

    Thanks!


  2. #2
    Forum User Feedback Score 0 AdamVR4's Avatar
    Join Date
    Sep 2010
    Owner Since
    2002

    Posts
    1,699
    Thanks
    513
    Thanked 387 Times in 258 Posts
    Quote Originally Posted by EvanH View Post
    Since the 6 and 2 are connected by a seperate 2" gear. The 6" gear and the adjacent 2" gear(driven by the 2" that is on the 6") will rotate the same direction, at 300 rpm each, and will have the ability to match the three points every time because the drive ratio for the 2" gear is a 1:1.

    And even if they were some hair brained sizes like 5.387 and 1.276, as long as the connecting gear was even they would still turn the same rate and direction.

    I think you've got it. Neglecting inertia, the 6" gear is essentially useless.

  3. #3
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,491
    Blog Entries
    1
    Thanks
    784
    Thanked 391 Times in 274 Posts
    The 6" gear is useless. Not really sure if that's what you were asking, but yeah...
    R135
    ╚╬╬╝
    - 24

  4. #4
    Forum User Feedback Score 0 19Eclipse90's Avatar
    Join Date
    Sep 2010
    Owner Since
    Sep 2004

    Location
    OKC
    Posts
    21
    Thanks
    15
    Thanked 4 Times in 2 Posts
    You've got it right. Gears on the same shaft rotate at the same speed.
    -Brian

  5. #5
    Forum User Feedback Score 1 (100%) lawdogg's Avatar
    Join Date
    Sep 2010
    Owner Since
    2003

    Location
    San Francisco
    Posts
    462
    Thanks
    55
    Thanked 26 Times in 23 Posts

  6. #6
    seize the carpe! Feedback Score 0 Lithium's Avatar
    Join Date
    Sep 2010
    Owner Since

    Posts
    233
    Thanks
    5
    Thanked 3 Times in 3 Posts
    Quote Originally Posted by DocWalt View Post
    The 6" gear is useless. Not really sure if that's what you were asking, but yeah...
    Not entirely, If this machine is using the 6" gear to rotate this assembly then It would give the machine more leverage over the 2" gears. For example if the machine was using an electric motor, an electric motor is limited by its voltage supply. The only way to change that motors output characteristics is to increase/ decrease voltage or increase/ decrease a particular gear set that the motor could be rotating. Long story short, Just like a bicycle, bigger gear in the back allows your feet to have more leverage over the tire but not much speed and vise versa. Small gear in the back allows for more speed but less leverage. So really in his example the size of the 6" gear could be used for regulating the speed of this said rotating assembly.

  7. #7
    Member verified
    supporter
    Feedback Score 0 DocWalt's Avatar
    Join Date
    Sep 2010
    Owner Since
    Oct '08 - Oct '10

    Location
    Royersford, PA
    Posts
    3,491
    Blog Entries
    1
    Thanks
    784
    Thanked 391 Times in 274 Posts
    Quote Originally Posted by Lithium View Post
    Not entirely, If this machine is using the 6" gear to rotate this assembly then It would give the machine more leverage over the 2" gears. For example if the machine was using an electric motor, an electric motor is limited by its voltage supply. The only way to change that motors output characteristics is to increase/ decrease voltage or increase/ decrease a particular gear set that the motor could be rotating. Long story short, Just like a bicycle, bigger gear in the back allows your feet to have more leverage over the tire but not much speed and vise versa. Small gear in the back allows for more speed but less leverage. So really in his example the size of the 6" gear could be used for regulating the speed of this said rotating assembly.
    Which is true, but completely unrelated to the question he's asking. He's only asking if the dots would stay "in time", which they would.

  8. #8
    seize the carpe! Feedback Score 0 Lithium's Avatar
    Join Date
    Sep 2010
    Owner Since

    Posts
    233
    Thanks
    5
    Thanked 3 Times in 3 Posts
    Quote Originally Posted by DocWalt View Post
    Which is true, but completely unrelated to the question he's asking. He's only asking if the dots would stay "in time", which they would.
    most likely true because I didnt read the OP lol.

  9. #9
    Member verified Feedback Score 2 (100%) blindmist's Avatar
    Join Date
    Sep 2010
    Owner Since
    Aug 15, 2005

    Location
    Texas
    Posts
    698
    Thanks
    15
    Thanked 45 Times in 28 Posts
    Quote Originally Posted by lawdogg View Post
    Now just to land it.....


    Lets put this into a real world use here.

    Your crank gear that turns the timing belt is exactly HALF the size of the cams (ratio being the factor which is 1:2). Therefore, your crank turns two times for every one rotation of the cam. So, if you have 1 mark that aligns on all of them, it will only happen once every other rotation of the crank.

  10. #10
    Advanced Tech? verified Feedback Score 0 i3igpete's Avatar
    Join Date
    Sep 2010
    Owner Since
    2006

    Posts
    948
    Thanks
    159
    Thanked 139 Times in 87 Posts
    Quote Originally Posted by lawdogg View Post
    Maddog Performance Engineering

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
3000GT / Stealth / GTO Resources
3000GT / Stealth / GTO / Multi-site Classifieds
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive