+ Reply to Thread
Page 3 of 6 FirstFirst 1 2 3 4 5 ... LastLast
Results 21 to 30 of 57
  1. #21
    Full Member KICK-ASS's Avatar
    Computer Details
    KICK-ASS's Computer Details
    Operating System:
    32-bit Operating System
    Computer:
    Dell Vostro 1520 Laptop
    Motherboard:
    ...WTF?
    CPU:
    Not sure yet.
    RAM:
    2.00 GB
    Graphics:
    Mobile Intel(R) 4 Series Express Chipset Family; 812 MB
    Primary Storage:
    Not sure.
    Secondary Storage:
    Not sure.
    Monitor:
    I am using a laptop.
    Discipline
    Mechanical
    KICK-ASS's Discipline Details
    Occupation
    Student (9th grade)
    Discipline
    Mechanical
    Details
    Currently, I'm working on dimensioning parts and creating them with CAD.
    Using
    AutoCAD 2014
    Join Date
    May 2013
    Location
    Valencia, CA
    Posts
    29

    Default

    Registered forum members do not see this ad.

    fotofriend_2717017.jpg Sorry about the blur in the upper left. IT WON'T GO AWAY!!! (Do you guys need a side view?)

  2. #22
    Luminous Being JD Mather's Avatar
    Using
    Inventor 2015
    Join Date
    Sep 2007
    Location
    Williamsport, PA
    Posts
    8,719

    Default

    Quote Originally Posted by KICK-ASS View Post
    I appreciate your help, but the reason I came hear was because I didn't know any of those kind of sprocket terms.
    I think you meant here rather than hear.
    You never answered my question. Are you really willing to go through this process step-by-step.

    Can you give me an approximate measure center to center of these arcs (just need a ballpark measurement).

    Distance.PNG Do you have a Machinery's Handbook?

    If you are a student, is there a reason you are not using Inventor?
    Certified SolidWorks Professional
    Autodesk Inventor 2015 Certified Professional
    Autodesk AutoCAD 2013 Certified Professional

  3. #23
    Luminous Being JD Mather's Avatar
    Using
    Inventor 2015
    Join Date
    Sep 2007
    Location
    Williamsport, PA
    Posts
    8,719

    Default

    If you have a Machinery's Handbook you should be able to find an image very similar to this one.

    Once you have commited to following the process we can begin.

    Sprocket parameters.jpg
    Certified SolidWorks Professional
    Autodesk Inventor 2015 Certified Professional
    Autodesk AutoCAD 2013 Certified Professional

  4. #24
    Luminous Being JD Mather's Avatar
    Using
    Inventor 2015
    Join Date
    Sep 2007
    Location
    Williamsport, PA
    Posts
    8,719

    Default

    Once you give me the approximate distance of the red line shown above on your actual part we can fill in the spreadsheet and calculate our parameters for this sprocket.

    Sprocket Calcs.jpg
    Certified SolidWorks Professional
    Autodesk Inventor 2015 Certified Professional
    Autodesk AutoCAD 2013 Certified Professional

  5. #25
    Super Member
    Using
    AutoCAD 2012
    Join Date
    Jun 2012
    Posts
    902

    Default

    Quote Originally Posted by KICK-ASS View Post
    And yes, I am willing to go step by step IF that is what it takes.
    JD, I think he did answer your question, but with a condition. The answer to his condition is, of course, that it DOES need to be step by step. I'll leave it to you to explain why.


    K-A, congratulation on making the pic and getting it uploaded--good enough; and congratulations on making some base measurements.

    A few more questions for you regarding your assignment: Do you have an actual statement of the assignment? If so, you should post that. Again, "Tell what you know, show what you've got."

    How much math do you have under your belt? I assume you have Algebra I. Have you taken a formal Geometry class? How much Trigonometry do you know? How much calculating are you allowed/expected to do for this assignment?
    How much are you allowed to reference outside the sprocket itself? For example, are you allowed to determine anything about it based on what it is, a standard roller chain sprocket? Did your teacher mention anything about tolerances regarding measurements? How close to exact are you supposed to be when done?

    You mentioned that you tried to draw a tooth, but the method did not seem to work out. I didn't really follow what you were trying to do, but in any case, you should post that attempt here. Along with the post you should include the dimensions you were using. Was it a method recommended by your instructor?
    Last edited by neophoible; 11th May 2013 at 09:52 am. Reason: words not spaced
    When all you have is a hammer, everything looks like a nail.--

    “Doc, it hurts when I do this.” “Well, don’t do that!”

    “Well, if you don’t know, I’m certainly not going to tell you!”

  6. #26
    Quantum Mechanic ReMark's Avatar
    Computer Details
    ReMark's Computer Details
    Operating System:
    Windows 7 Pro 64-bit
    Computer:
    Thinkmate
    Motherboard:
    Intel DX58SO2 LGA1366 X58
    CPU:
    Intel i7-960 Quad-core 3.20GHz 8MB cache
    RAM:
    12GB (3x4GB) PC3-106000 DDR3
    Graphics:
    nVidia Quadro K4200, 4GB GDDR5
    Primary Storage:
    150GB Velocipraptor 10,000 rpm
    Secondary Storage:
    none
    Monitor:
    Dell P24LLH - 24" wide screen LCD
    Discipline
    See details...
    ReMark's Discipline Details
    Occupation
    CAD Draftsman/Designer...chemical manufacturing.
    Discipline
    See details below.
    Details
    I work for a specialty chemical manufacturer. I do a little bit of everything from P&IDs to civil to architectural and structural.
    Using
    AutoCAD 2018
    Join Date
    Nov 2005
    Location
    Norwalk, CT USofA
    Posts
    46,375

    Default

    You would have been better off taking a digital picture with your phone and posting it.
    "I have only come here seeking knowledge. Things they wouldn't teach me of in college." The Police

    Eat brains...gain more knowledge!

    I'm now a full member of the Society for the Promotion of Mediocrity in CAD. Standards? We don't need no stinkin' standards! Take whatever advice I offer and do the opposite.

  7. #27
    Luminous Being JD Mather's Avatar
    Using
    Inventor 2015
    Join Date
    Sep 2007
    Location
    Williamsport, PA
    Posts
    8,719

    Default

    Quote Originally Posted by neophoible View Post
    JD, I think he did answer your question, but with a condition. The answer to his condition is, of course, that it DOES need to be step by step. I'll leave it to you to explain why.
    I missed this response by the OP. My internet is going painfully slow making it difficult to go backwards in the discussion thread (each page takes 5 minutes to load).

    Sprockets are governed by standardized dimensions as indicated in the Machinery's Handbook. I have set up a spreadsheet for the calculations - so no math is needed (unless the OP wants to dig into the math).


    The process is fairly straitforward for someone who knows how to draw circles, lines, trim and extend and a couple of rotates of lin
    Certified SolidWorks Professional
    Autodesk Inventor 2015 Certified Professional
    Autodesk AutoCAD 2013 Certified Professional

  8. #28
    Luminous Being JD Mather's Avatar
    Using
    Inventor 2015
    Join Date
    Sep 2007
    Location
    Williamsport, PA
    Posts
    8,719

    Default

    I just realized that the OP did give an OD dimension for the sprocket earlier that would indicate that it is smaller than a #40 chain. OD is not the best of measurements to go by as the theoretical perfect points are usually cut down a bit becuase they would quickly wair away anyhow. (now all my spelling is looking suspect to me, if my internet was not running so slow I would do a check, but oh well.

    The best measure would be the pitch, but the thickness is also a pretty good measure (and the easiest) since the thickness is also governed by the standard chain sizes and given in the Machinery's Handbook. (see tooththick variable in spreadsheet image above) Of course manufacturing tolerance and application might vary that parameter a bit, but it shouldn't be too far off and can only go one direction (smaller) as you can't make the chain wider from side to side.
    Certified SolidWorks Professional
    Autodesk Inventor 2015 Certified Professional
    Autodesk AutoCAD 2013 Certified Professional

  9. #29
    Super Member
    Using
    AutoCAD 2012
    Join Date
    Jun 2012
    Posts
    902

    Default

    Quote Originally Posted by KICK-ASS View Post
    What I can tell you so far is that all I am permitted to measure with is a 6" CEN-TECH Dial Caliper.
    One of the reasons for my extra questions is that, from the OP, it sounds like he may be required to rely solely on measuring the sprocket and is not allowed to consult any manuals. I would like for him to clarify his assignment so that we can help him do it the way the instructor expects. The main thing is to get off dead center and start. He's done that, and that's a good thing. Now he can continue to move forward, but he will not be closer to the end of his assignment if he doesn't do it according to the instructor's specifications, though he stands to learn a lot in any case.
    When all you have is a hammer, everything looks like a nail.--

    “Doc, it hurts when I do this.” “Well, don’t do that!”

    “Well, if you don’t know, I’m certainly not going to tell you!”

  10. #30
    Luminous Being JD Mather's Avatar
    Using
    Inventor 2015
    Join Date
    Sep 2007
    Location
    Williamsport, PA
    Posts
    8,719

    Default

    Registered forum members do not see this ad.

    Quote Originally Posted by neophoible View Post
    .... sounds like he may be required to rely solely on measuring the sprocket ....
    Having worked out on the shop floor for 8 years making parts, in my opinion such an effort would be a waste of time. Better to do it by the standards.
    Certified SolidWorks Professional
    Autodesk Inventor 2015 Certified Professional
    Autodesk AutoCAD 2013 Certified Professional

Similar Threads

  1. Measuring an existing drawing
    By l00k_uk in forum AutoCAD Beginners' Area
    Replies: 36
    Last Post: 15th May 2012, 03:18 am
  2. Trimming problems need help desperately
    By hailiang in forum AutoCAD Bugs, Error Messages & Quirks
    Replies: 1
    Last Post: 29th Jul 2010, 04:45 pm
  3. help with sprocket please...
    By tds73 in forum AutoCAD General
    Replies: 9
    Last Post: 20th Oct 2009, 03:19 pm
  4. DESPERATELY Need Pen Plotter Help
    By ATKOgirl in forum Hardware & Operating Systems
    Replies: 20
    Last Post: 15th Nov 2008, 03:27 pm
  5. Help need for drawing a BMX sprocket- see picture
    By willsy in forum AutoCAD Beginners' Area
    Replies: 4
    Last Post: 15th Sep 2005, 11:05 pm

Tags for this Thread

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