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Message No. 13004, Started by dfischer on 01/14/04
I am trying to figure out how to get the right answers to the following questions? Can anyone help? I would like to know if someone can show me how they are figuring out the problems.  The questions I have are all multiple choice, but the book does not give a good example for figuring out these problems. I appreciate any help you can give me.

1. A miter gear having 40 teeth and cut with a circular cutter has a  
    diametral pitch of 4. Determine the root angle. I know the answer
    is one of the following but I am trying to understand how they get
    to the answer.

    a. 21 deg 29' b. 33 deg 41' c. 42 deg. 58' d. 51  deg 33'

2. Calculate the pitch diameter of a worm wheel if the pitch of the
    single thread of the worm is 3/4", and the velocity ratio of the
    worm and worm wheel is 40.

    a. 9.55" b. 11.25" c. 13.45" d. 15.25"

3. Two screw gears that run together have a radii of 6" and 8"
    respectively. The angle between their axes is 60 deg and their
    threads make equal right angles. If the gear of 6" radius has 36
    teeth, calculate the normal circular pitch.

   a.0.6554" b.0.7912" c. 0.8423" d. 0.9069"

4. Calculate the number of teeth on the gear of 8" mentioned in
    question #3.

    a. 24  b. 36 c. 48 d. 72  


Diana Fischer

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Follow-up Messages (19)
Regarding triple threaded worms. You would solve the problem in a simila...
No. 13031, Posted by b1ueshift on 01/16/04, 16:23 PST.
The description given in question 3 is clear as mud. However it does seem ...
No. 13030, Posted by b1ueshift on 01/16/04, 16:20 PST.
I found a very comprehensive gear info resource:
No. 13029, Posted by b1ueshift on 01/16/04, 15:54 PST.
"their threads make equal right angles" can only refer to the threads on t...
No. 13028, Posted by gerdb on 01/16/04, 11:46 PST.
"If this gear was a triple threaded worm gear with the same criteria as tha...
No. 13025, Posted by gerdb on 01/16/04, 10:46 PST.
Thanks for your help, but unfortunately when I get to the final exam for th...
No. 13024, Posted by dfischer on 01/16/04, 04:03 PST.
Thanks, this is what I needed, now I understand what I was missing. I misse...
No. 13023, Posted by dfischer on 01/16/04, 03:59 PST.
Diana, now that I've had time to sit down and look at the other three quest...
No. 13022, Posted by acroduster1 on 01/16/04, 03:50 PST.
Thanks for your help, this gives me a better idea at how they arrived at th...
No. 13021, Posted by dfischer on 01/16/04, 03:48 PST.
Gerdb's explanation contains some impressive rhetoric about the very nature...
No. 13020, Posted by b1ueshift on 01/15/04, 18:34 PST.
your clue should have been the randomize function......
No. 13015, Posted by rorschach on 01/15/04, 05:40 PST.
Care for a right answer? I'm running very tight on time, so I'll do the on...
No. 13014, Posted by acroduster1 on 01/15/04, 03:28 PST.
2. Calculate the pitch diameter of a worm wheel if the pitch of the single ...
No. 13013, Posted by gerdb on 01/15/04, 00:13 PST.
I could not see a connection, there was too little programming for the amou...
No. 13012, Posted by gerdb on 01/14/04, 22:40 PST.
Gerdb, it is a random answer generator.... not terribly useful
No. 13011, Posted by rorschach on 01/14/04, 18:24 PST.
now rolschwarz... that's just being cruel..... funny, but cruel..... the...
No. 13010, Posted by rorschach on 01/14/04, 18:22 PST.
I can tell you the answer to number 2, because it's the easiest. Pitch ...
No. 13007, Posted by b1ueshift on 01/14/04, 14:16 PST.
can you do this in C++? Only compiler I have.
No. 13006, Posted by gerdb on 01/14/04, 13:52 PST.
I used a computer program to figure this out I got answers #1=A, #2=d, #3=...
No. 13005, Posted by rolschwarz on 01/14/04, 13:25 PST.
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