How do I add the last mates without getting errors on the pervious mates that where good?

dylan_bowers144

I have been working on ordering the mates differently to see if that has an effect and so far no luck, I am just so puzzled. Every time I fix a problem a new one appears. 

https://cad.onshape.com/documents/05eb48224e3c2e0a586cdba1/w/89553662a352078fb4f806d4/e/b41b15d23b19c0373edc625c

steve_shubin

@dylan_bowers144

Here is your part studio animated

https://cad.onshape.com/documents/56f325ce5399d841c8894a7b/w/bf08fc8f8881ed1bb8c5d680/e/073b415c096003ff65b8e53b

steve_shubin

@dylan_bowers144

If you’re curious about exactly what I did with your particular part studio

After importing

1. I brought the four parts into the assembly at the same time — meaning I selected the part studio but not the individual parts, in order to bring them into assembly in the same position relative to one another, that you had them in the part studio
2. Grouped them
3. Created a revolute mate at the origin and the end of the crankshaft
4. Ungrouped
5. Fixed the block in place
6. Created revolute mate at crankshaft and connecting rod
7. Created a slider at Piston to block

then

I tried a revolute mate at the connecting rod to piston, but I figured this possibly would not work, and it didn’t — because although I knew the pivot point at the piston would align with the pivot point at the connecting rod, I suspected that the points I picked for the mates at the piston & rod would not be coincident along the axis that ran parallel to the length of the block

So then I tried a cylindrical mate, which gave me that degree of freedom along that axis parallel to the length of the block — that is along the slider portion of the cylindrical mate — and that worked

Prachi

No need for a slider mate in this case a cylindrical mate will do nicely. May be looking at slider limits over defining. A cylindrical mate has no limits on the main axis.
Also there is no mate for the crank to revolve around. Try animating the crank revolute in example.
https://cad.onshape.com/documents/1e042395b29f5c7b2e314a28/w/80ee73eac7ffe5012aaf0ac6/e/d35246edc3c12803fff1c9eb

steve_shubin

@dylan_bowers144

Here is your part studio animated

https://cad.onshape.com/documents/56f325ce5399d841c8894a7b/w/bf08fc8f8881ed1bb8c5d680/e/073b415c096003ff65b8e53b

steve_shubin

@dylan_bowers144

If you’re curious about exactly what I did with your particular part studio

After importing

1. I brought the four parts into the assembly at the same time — meaning I selected the part studio but not the individual parts, in order to bring them into assembly in the same position relative to one another, that you had them in the part studio
2. Grouped them
3. Created a revolute mate at the origin and the end of the crankshaft
4. Ungrouped
5. Fixed the block in place
6. Created revolute mate at crankshaft and connecting rod
7. Created a slider at Piston to block

then

I tried a revolute mate at the connecting rod to piston, but I figured this possibly would not work, and it didn’t — because although I knew the pivot point at the piston would align with the pivot point at the connecting rod, I suspected that the points I picked for the mates at the piston & rod would not be coincident along the axis that ran parallel to the length of the block

So then I tried a cylindrical mate, which gave me that degree of freedom along that axis parallel to the length of the block — that is along the slider portion of the cylindrical mate — and that worked