Is there a way to this?

dan_2

I am trying to design a rotisserie for an oven and like a Ferris wheel I will have trays revolve about center axis on a wheel and the trays like the seats on a Ferris wheel will remain parallel to the ground. I havnt a clue how to use mates to set it up Thanks Dan

jakeramsley

I have my test document here: https://cad.onshape.com/documents/4e217116c8df4e489a894a2c/w/309e5a3b69a64ec183ad04dd/e/220e5212c0ab496198ff1656

1. Insert the rotisserie part that is rotating.  Start a revolute mate.


2. Select the center of the rotisserie (I use the shift key to be able to get the middle mate connector).  Then select the mate connector that goes with the right plane at the origin.  This allows the rotisserie to rotate about the center of the origin.


3. Insert the carriage and make a revolute mate.  Select the outer portion of the rotisserie center that you want the carriage to be attached to.  Then select the connection point of the carriage.  This should allow the carriage to rotate about the rotisserie


4. Create a gear mate relation between the two revolute mates.  Make the relation 1 so that as the center rotates the carriage counter-rotates.


5. Select the rotisserie and start rotating it.  If the gear relation is correct, the carriage will stay in a relative position.  If not, re-open the gear mate relation and select "Reverse Direction".

jakeramsley

It takes a bit of set-up, but I would make the center of the rotisserie rotate about the origin with a revolute mate and then each tray rotate about the prongs/bars/etc with a revolute mate.  I would then add a gear relation of 1 : 1 between these mates so that as the center of the rotisserie rotates, the tray counter-rotates to negate the rotation of the rotisserie.  

I'll try to mock something up in a bit to 1) validate my thinking and 2) explain what it is.

jakeramsley

I have my test document here: https://cad.onshape.com/documents/4e217116c8df4e489a894a2c/w/309e5a3b69a64ec183ad04dd/e/220e5212c0ab496198ff1656

1. Insert the rotisserie part that is rotating.  Start a revolute mate.


2. Select the center of the rotisserie (I use the shift key to be able to get the middle mate connector).  Then select the mate connector that goes with the right plane at the origin.  This allows the rotisserie to rotate about the center of the origin.


3. Insert the carriage and make a revolute mate.  Select the outer portion of the rotisserie center that you want the carriage to be attached to.  Then select the connection point of the carriage.  This should allow the carriage to rotate about the rotisserie


4. Create a gear mate relation between the two revolute mates.  Make the relation 1 so that as the center rotates the carriage counter-rotates.


5. Select the rotisserie and start rotating it.  If the gear relation is correct, the carriage will stay in a relative position.  If not, re-open the gear mate relation and select "Reverse Direction".

dan_2

jakeramsley  Thanks ,you Da Man. I was thinking in those terms. Who says you can't teach an old dog new tricks? In a couple of weeks I turn 67 and I am so excited about OnShape because it allows me to have some income designing machines. I have a neuro-muscular disease that confines me to a wheel chair and fortunately I have a computer and the internet. My brother has metal fab shop and does aero-space stuff. I can sit at home and collaberate with him on the shop floor. Very cool !  We are going to pro version and I have seen some grumbling about price. I figure if you can,t make $100 a month doing cad you should stick with Sketch-up :>) CAD in the cloud is the way up and forward and OnShape is the ROCKET . Thanks again Dan