Problems with Mating

phil_sheppard

Hi - I'm stuck with a small project.  I can't seem to insert the image as others have done in this forum, but I can give the URL:

https://cad.onshape.com/documents/b4dee06f3fe15b14a25f7ce7/w/6df653bdfb109443029dd6d9/e/c94cb3ec215fba061bfb5dec

I think the problem is obvious from this uncompleted Assembly. I can't make the smaller piece mate to the full face of the bigger piece.

Otherwise, are there any more advanced Onshape users local to me (Loughborough, UK) who could act as a mentor or buddy?

Regards - Phil Sheppard

brucebartlett

Hi Phil,

Hopefully, you will get the help you need from the forum. Insert a picture with the attach image icon, 5 from the left at the top.

This first thing I see when I open your document is your parts are modeled in separate tabs, to really make use of the power of Onshape I'd model all the separate parts in 1 part studio (tab) which allows them to be modeled in position and have links easily created parametrically between parts. This will also make it easy for the assembly, as you can just drop the whole part studio in and group mate.

In your assembly, firstly I fixed the large part then had a little go at getting your mate's right but not sure if these are the correct positions. See the model, one end was mated with cylindrical and revolute mates. The other I aligned the mate connector connected to the larger part using the secondary axis to the edge and then used the very simple fasten mate. 

https://cad.onshape.com/documents/5873e16469ca5410c4d4f277/w/bc0c6bee15c0a0f2ab3de4e7/e/06b08547605940ce93030662



 

phil_sheppard

Bruce - Thanks very much for helping me.  Firstly thanks for the tip about modelling all parts in one tab. I did a course on Onshape offered by Kingston University in the UK, which was very good I thought, and their approach was to model separate parts in separate tabs, probably to minimise confusions for novices like me.

I have now managed to get the parts to mate properly, and can see that I have got the dimensions slightly wrong, so I'll correct.  The thing I learned was that the orientation axes of each mate have to be aligned, which they weren't in my first attempt.

I hope to get this 3D printed when finished.  It's a lip for a plant holder; currently soil falls out of the holes for the plants to stick out of, so the lip will hook into the hole and prevent the soil fallout.  If I get good at Onshape I'll be able to make a bit of money and pay for the Professional sub!

Thanks again - Phil.

brucebartlett

Hi Phil,

Hopefully, you will get the help you need from the forum. Insert a picture with the attach image icon, 5 from the left at the top.

This first thing I see when I open your document is your parts are modeled in separate tabs, to really make use of the power of Onshape I'd model all the separate parts in 1 part studio (tab) which allows them to be modeled in position and have links easily created parametrically between parts. This will also make it easy for the assembly, as you can just drop the whole part studio in and group mate.

In your assembly, firstly I fixed the large part then had a little go at getting your mate's right but not sure if these are the correct positions. See the model, one end was mated with cylindrical and revolute mates. The other I aligned the mate connector connected to the larger part using the secondary axis to the edge and then used the very simple fasten mate. 

https://cad.onshape.com/documents/5873e16469ca5410c4d4f277/w/bc0c6bee15c0a0f2ab3de4e7/e/06b08547605940ce93030662



 

phil_sheppard

Bruce - Thanks very much for helping me.  Firstly thanks for the tip about modelling all parts in one tab. I did a course on Onshape offered by Kingston University in the UK, which was very good I thought, and their approach was to model separate parts in separate tabs, probably to minimise confusions for novices like me.

I have now managed to get the parts to mate properly, and can see that I have got the dimensions slightly wrong, so I'll correct.  The thing I learned was that the orientation axes of each mate have to be aligned, which they weren't in my first attempt.

I hope to get this 3D printed when finished.  It's a lip for a plant holder; currently soil falls out of the holes for the plants to stick out of, so the lip will hook into the hole and prevent the soil fallout.  If I get good at Onshape I'll be able to make a bit of money and pay for the Professional sub!

Thanks again - Phil.