Forum Index
BesslerWheel.com
Discussion Board

Log inLog in RegisterRegister SearchSearch BlogsBlogs Blog NewsBlog News PollsPolls FAQFAQ FAQWiki
Forum Index
A Motion Machine

 
Page 2 of 14 Goto page Previous  1, 2, 3, ... 12, 13, 14  Next
Post new topic   Reply to topic    Forum Index -> General Discussion
View previous topic :: View next topic  
Author Message
Bill_Mothershead
Aficionado
Aficionado

Joined: 02 Feb 2008
Posts: 265
Total Words: 24,918
Location: Phoenix, AZ

Reputation: Appreciated
Appreciated  
PostPosted: Fri Feb 03, 2012 2:22 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Quote:
Writing from the view of a true pessimist, a ramp mechanism by any other name is still just that and (in this corner) tried and discarded in all its manifestations.


True for prime movers.

But cams can be useful control mechanisms.

In the case of a chiming clock, the power of the chime
comes from the hanging weight, but the timing/control
is from the snail shaped (ramp shaped) cam.


Back to top
View user's profile Send email
rasselasss
Aficionado
Aficionado

Joined: 31 Jan 2012
Posts: 359
Total Words: 22,506
Location: northern ireland

Reputation: Acknowledged
Acknowledged  
PostPosted: Fri Feb 03, 2012 7:03 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Hope this works it did'nt the first time.





wheel 006_opt.jpg
 Description:
 Filesize:  22.93 KB
 Viewed:  72 Time(s)

wheel 006_opt.jpg



wheel 003_opt.jpg
 Description:
 Filesize:  24.81 KB
 Viewed:  78 Time(s)

wheel 003_opt.jpg



wheel 004_opt.jpg
 Description:
 Filesize:  24.67 KB
 Viewed:  94 Time(s)

wheel 004_opt.jpg



_________________
Rasselas busied himself so intensely in visionary bustle he forgot his solitude
Back to top
View user's profile
rasselasss






PostPosted: Fri Feb 03, 2012 7:40 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Took me a while to post these photos of the drawing,i'm disappointed the compression effect shrunk the image never the less....004 shows the spokes and weights from the drum side at 12 o'clock....this is the position the bullet shaped weights and guide pins must be in to give motion...which i will detail the problems later.......003 shows approx.position of guide pins in the fixed slotted guide plate at 12 o'clock ......006 shows the fixed slotted guide plate on its own...please remember this is a sketch not to scale and for simplicity i have not included the simple structure to carry and support the wheel(which would cloud the details of the wheel with pencil lines.i'll post the problems in my next post in casa this computer throws me out......i'm really slow at typing.Thanks for bearing with me.


Back to top
View user's profile
rasselasss






PostPosted: Fri Feb 03, 2012 8:50 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

I propose a linear fixed cam(rigid) fixed to a stanchion which would fit very close to the guide pins(these pins would have small roller bearings to reduce friction)and position the linear cam round the axle but not touching it(not rubbing etc.)....I had thought of a box cam(grooved track)but the acute angles needed might cause lockup of the turning wheel this brings on the next problem,the acme quick screw spokes could possibly induce lockup too so maybe just a rattling fit so to speak weight sliding up and down a plain spoke....another problem is the weight at 9 o'clock may have to be positioned further to the spoke centre because of the close proximity of the weight guide pin at 6 o'clock(which i would prefer not to do as it would reduce the turning torque)i would also prefer the acme quick thread spoke for controlled movement......looking at fig 003 we can see what the fixed pins and weights have do to complete a 360 degree turn ....i welcome any advice or constructive criticism but to me i must build the model/contraption.....before i can decide on the fixed cam or type required...thanks to all who assisted in helping me to post the sketches..you are very helpful people.


Back to top
View user's profile
Tarsier79
Devotee
Devotee

Joined: 12 Mar 2010
Posts: 1621
Total Words: 117,115
Location: Qld, Australia

Reputation: Well respected
Well respected  
PostPosted: Fri Feb 03, 2012 11:01 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Cam driven overbalance:

Posts from Wubbly:
http://www.besslerwheel.com/forum/viewtopic.php?p=96299#96299

Posts from Me:
http://www.besslerwheel.com/forum/viewtopic.php?p=74500#74500


Back to top
View user's profile Send email MSN Messenger
Wubbly
Aficionado
Aficionado

Joined: 06 Jun 2009
Posts: 290
Total Words: 43,835
Location: A small corner of the Milky Way Galaxy

Reputation: Well respected
Well respected  
PostPosted: Sat Feb 04, 2012 1:59 am    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

.

MT65 from Besslerwheel wiki
http://www.besslerwheel.com/wiki/index.php?title=Image:Mt_065.gif

.


Back to top
View user's profile Visit poster's website
rasselasss






PostPosted: Sat Feb 04, 2012 12:58 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Tarsier79 i appreciate the links(food for thought)and Wubbly i found that link very interesting......Over here its been bitter cold and i have no heat in my workshop,hopefully the cold snap which is unseasonable for here will cease in the next few days and i can make this contraption.If i bring anything into the house that does not resemble a household fixing i get the Medusa stare from" her indoors "which believe me stops most folk in their tracks.........I remember many years ago before he was famous attending a lecture by Stephen Hawkins at Manchester University,anyway after the lecture he asked for questions and one of the under graduates present asked the age old question which bore no relation to any part of the lecture ,he said "Which would hit the ground first if a ton of lead and a ton of feathers was dropped at exactly the same time from a height of 100 feet", Hawkins was obviously somewhat taken aback but after a moment or two said, "I can give you 2 or 3 variable formulas for the answer,but the best solution is to try it and see"......i am very much "a try it and see "type of person and if it does not work i will continue to try.....thats what i like about this forum the enthusism from the bloggers is contageous and encouraging no matter what the outcome of our endeavours...


Back to top
View user's profile
rasselasss






PostPosted: Sat Feb 04, 2012 6:42 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Please forgive spelling error of Stephen Hawking,...unforgiveable!!


Back to top
View user's profile
daxwc
Devotee
Devotee

Joined: 27 Mar 2007
Posts: 1961
Total Words: 190,155
Location: Wile E. Coyote

Reputation: Well respected
Well respected  
PostPosted: Sat Feb 04, 2012 10:17 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Quote:
Please forgive spelling error of Stephen Hawking,...unforgiveable!!

Nah, it is ok; he rarely spells my name correctly.



_________________
"Never argue with an idiot, because they will only bring you down to their level and beat you by experience."- John Guerrero

Wile E. Coyote - super genius; “I like the way that rolls out”
Back to top
View user's profile
rasselasss






PostPosted: Tue Feb 07, 2012 5:35 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Its still bitter cold here,yesterday the wife was out so i made a start to the model(in the kitchen!!)just the fixed guide plate,the linear cams to make and acquire the guide pin bearings.... two photos...





model 73 001_opt.jpg
 Description:
 Filesize:  40.56 KB
 Viewed:  142 Time(s)

model 73 001_opt.jpg



model 73 002_opt.jpg
 Description:
 Filesize:  30.5 KB
 Viewed:  91 Time(s)

model 73 002_opt.jpg


Back to top
View user's profile
rasselasss






PostPosted: Mon Feb 13, 2012 12:22 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Sketch with linear cam template below the axle and snail cam template above the axle to show how little of "nudge" required to comlete one revolution....also photo of "rig"with mods.to adjust height should a larger wheel be made........i ran it at 100 r.p.m.attached to drill m/c for 10 minutes to loosen tight spots.......if it does not "run"as expected i could connect it to a timer and simple motor to frighten the birds from my seeds in the springtime!(joke)





m_opt 01.jpg
 Description:
 Filesize:  27.41 KB
 Viewed:  86 Time(s)

m_opt 01.jpg



m_opt.jpg
 Description:
 Filesize:  51.25 KB
 Viewed:  79 Time(s)

m_opt.jpg


Back to top
View user's profile
rasselasss






PostPosted: Mon Feb 13, 2012 12:54 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

For those interested in "cams" here is a link ......http://www.cs.cmu.edu/~rapidproto/mechanisms/chpt6.html


Back to top
View user's profile
rasselasss






PostPosted: Mon Feb 13, 2012 12:58 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

http://www.cs.cmu.edu/~rapidproto/mechanisms/chpt6.html


Back to top
View user's profile
rasselasss






PostPosted: Tue Feb 14, 2012 12:29 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

A rough sketch of a m/c i made a few years back(which i am sure has been done before on this Forum)...i had some success using differing "pulls"of magnets and lighter/heavier pendulum weights to drive a simple "clock train".....the problem was the pendulum "shake"which i controlled to some degree in a slotted wooden track....i dismissed the contraption because although it would "run" for weeks driving the clock train/hands etc......i could not make it do "work"(lifting weights etc.)....since joining this Forum and reading others and their theories on pendulum activity....i shall look at this again....PS....the time keeping was erratic to say the least.





m_opt 01.jpg
 Description:
 Filesize:  27.41 KB
 Viewed:  70 Time(s)

m_opt 01.jpg


Back to top
View user's profile
rasselasss






PostPosted: Tue Feb 14, 2012 12:32 pm    Post subject: re: A Motion Machine Reply with quote Report Post to Admin

Whoops!!!!





m_opt.jpg
 Description:
 Filesize:  51.25 KB
 Viewed:  73 Time(s)

m_opt.jpg


Back to top
View user's profile
Display posts from previous:   
Post new topic  Reply to topic    Forum Index -> General Discussion All times are GMT
Page 2 of 14 Goto page Previous  1, 2, 3, ... 12, 13, 14  Next


 
Jump to:   
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You can vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum

Log in:         Remember me     

Please click below to help support this website!

Google