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what mate to use??? [PICS]

J

jbates2454

New member
This is driving me nuts. I am a "figure it out myself"
kind of guy and i am stuck on something so simple.

Its a rotary table with a stepper (not sure?) motor. one
revolution of the motor spins the table 90* but not at a
constant speed...the pics explain it. As the pin engages
the table slots, it spins the table 90*. then picks up
the next slot.

what mate to use???

EDIT: cant get the IMG tags to work, providing link to
direct pictures instead

http://i985.photobucket.com/albums/ae340/JaysCustomWoodwo
rking/1-1.jpg

http://i985.photobucket.com/albums/ae340/JaysCustomWoodwo
rking/2-1.jpg

http://i985.photobucket.com/albums/ae340/JaysCustomWoodwo
rking/3.jpg


border=
oodworking/1-
1.jpg">
border=
JaysCustomWoodworking/2-
1.jpg">
border=
JaysCustomWoodworking/3.jpg">
Edited by: jbates2454
 
jbates,


Your links came in pretty jumbled... Here they are again:


[url]http://i985.photobucket.com/albums/ae340/JaysCustomWoodworki ng/1-1.jpg[/url]
[url]http://i985.photobucket.com/albums/ae340/JaysCustomWoodworki ng/2-1.jpg[/url]
[url]http://i985.photobucket.com/albums/ae340/JaysCustomWoodworki ng/3.jpg[/url]


Since your slot is going to be slightly larger in diameter than your pin (to allow for tolerances), I would just use a tangent mate. One selection would be the cylindrical surface of the pin, and the other would be one of the flat surfaces of the slot. What you won't be able to simulate is the backlash of the joint.


Make sense?


Jim
http://www.linkedin.com/in/shawengineering



Edited by: jimshaw
 
yes, i had the tangent mate going when i made the pics. But
the problem is after the pin leaves the slot, the table
rotates back with the pin. im wanting to have the table
stay in place after the pin leaves the slot. then the pin
picks up the next slot. in essence the table only rotates
one direction...90* at a time. rotate 90 and stop...rotate
90 and stop.... the tangent mate makes the table rotate
backwards where the pin is only engaged with a single
slot...make sense? i can email a zip file if you would like
 
Well i know it can be done. I got the idea from a video
on YouTube showing the exact same thing. Cannot locate
the video for the life of me now tho. I was trying to
contact the poster of the video for advice. I believe
what he did was make a sketch on top of the table and
extrude a surface for the pin to run along. Basically a
large Cam mate. Then hide the surface for the assembly.
Anyway, it is more of a just for fun project but the
table is going to be incorporated into an assembly line
when i get it figured out. it is not going to be these
particular pieces. I threw some parts together to find
out how to mate them for when i put the major assembly
together.

also, selfish plug for myself :) check out my YouTube
SolidWorks animations....
www.youtube.com/jbates2454
 
jbates,


OK, I gave it a try. Here is my assembly: the actual parts are in green/reed, and the trajectory surface for the table is transparent orange.


View attachment 5861


I'm still getting some binding at the bottom of the slots, but I'm sure some tweaking could change that. I created the trajectory body and did not merge it with the existing slotted table, thus allowing me to hide it separately...


Jim
http://www.linkedin.com/in/shawengineering
 
your a good man mr jim. nice work. i just need to get some
tweeking done and hopefully will be able to get the
assembly going. Thanks for giving me a good visual of where
to start.
thanks again!
 
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