Pattern (Circular) question.

[Anonymous]

My goal is to create two discs - one with a circle of 'pits' and one with a single 'pip' - the idea being when the discs are bolted together through a centre hole, the 'pip' will go into the 'pits' to allow a position to be selected?

I can create the disc with the pits - 72 of them - by placing a sphere and then using a pattern, but when I create the upper disc it is 'inheriting' the centre hole and all the 'pits' - I can hide the bottom disc but need to be able to locate the top disc on the centre hole?

I am very new at Fusion 360 and struggle a bit with the concept of sketches - the way I created the bottom disc was to create a circle on the base plane, extruded it up, created a sketch on the top face, added a hole to the top face in the centre, added a construction circle, added a sphere on the construction circle and then added a pattern using the construction circle to replicate the sphere 72 times - which seemed to work correctly.

Is this the correct approach? Add the sketch on the top face and then add the construction circle, sphere and pattern to the same sketch? Or create a sketch for each???

The second disc, do I add another sketch to the top face, add another (smaller circle)  and extrude this up? Or move the plane up to the same level as the top of the first disc and add the second circle to this??

I know you have to add objects to a plane or a sketch?? 

Thanks 

Chris

[davebYYPCU]

There are a few different ways to do everything, so it comes down to what you prefer,

sounds like you are on the right track, ceertainly patterning the objects is far better than patterening in sketches, in Fusion anway,

So if I have it right, the second plate should be the 2nd component, discounting washers and airgaps for a minute,

you can make it on top of the 1st plate, and project one dimple onto it, disregard the original bolt hole and sketch the correct one,

I think that's what you asked for,

easy to do examples with your file, export and attach it here we came take you through it if you want.

[Anonymous]

Yes, I am creating the second (top) plate as a new component, on top of the first but it 'inherits' all the dimples and central hole from the bottom plate?

I have tried to delete all the dimples with a view to leaving one as a 'join' rather than 'cut' but got lost - I can't work out if inheriting the dimples also inherits the sketch they were originally on?

Chris

[Anonymous]

As an aside, I didn't understand this?

"sounds like you are on the right track, ceertainly patterning the objects is far better than patterening in sketches, in Fusion anway,"

I thought I had created the pattern on the sketch? 

Chris

[daniel_lyall]

What it means is If you do your pattern as a sketch feature then extrude/cut whatever it is it can slow fusion down a lot.

If you do one sketch extrude or cut that, then do a pattern feature of the extrude or cut it does not slow fusion down, it may by a tiny bit.

What may help is start a new component then do a plane on the faces where you wont the new body to go, then any sketch item you wont in the new component you can just project onto that plane and select the plane when you wont to do some sketching, Doing it this way you have less chances of by mistake drawing on the wrong part.

[davebYYPCU · Accepted solution]

Sorry lost in the interpretation,

You say you have a plate, with dimples, I was thinking you have "finished" the cut dimples,

What we are saying is cut one dimple then pattern it,

For you to be seeing the sketch pattern in the second component, then you probably have the preferences for auto project sketch when created turned on,

You can turn it off, or make the new sketch on another plane, not the face of the plate, this will not autoproject, until you snap to the other sketch articles.

Again it is difficult to see the problem so far.

[Anonymous]

Thank you - I had not seen the option to 'Auto project'

As I mentioned I am new to Fusion 360 and struggle to work out when (and sometimes how!) to use sketches - I have been turning off the first component to stop it being projected on the second but a couple of times I have saved the model and lost the component that was turned off...when I re-opened the model the browser did not show the component and I had to redraw it 😞

All good practise I suppose...

There is a lot of training material but the majority is video clips, which are hopeless when you are getting started - you cannot usually see what is being clicked on!

I have also had  a few lockups and screen freezing so I guess the software is a bit buggy?

Thanks for the advice 

Chris

[davebYYPCU]

Happy to help,

Next time you cant find something, make sure the timeline is sent to the end of the file, then you can check light bulbs, for lower level folders,

For example, if the body or sketch light is off, but the component light is on, you wont see it,

I don't get any freezes, sometimes the back of the browser goes black and I have learnt to WAIT while it finishes thinking, I can make it worse if I dont wait.