Conical Burr Grinder Modelling

[Anonymous]

We are modelling a conical burr grinder as shown in the attached image.

So far we have used a circular pattern within a sketch, extruded it, and used a taper angle, as shown below.

We aren't able to capture the deeper groove that occur further up the part, we are also missing the twist present in the pattern as it transitions from top to bottom.

Because the pattern will require several prototypes to test and refine we would love to find a way to more accurately achieve the grinder structure while maintaining the ability to easily modify the pattern.

Suggestions would be greatly appreciated.

[Beyondforce]

Hi @Anonymous,

Just to confirm, do you need help creating the right model in the picture?

Cheers / Ben
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[Anonymous]

Hi there,

Yes, I need help creating something very similar. The only stipulation is that we'd like it to be very easy to edit. We will be prototyping many burr patterns to see what works best for our applications.

So to be clear, ideally we'd like to recreate whats in the images, but have the ability to tweak the bur patterns to our liking.

[jeff_strater · Accepted solution]

OK, I waited all day for the modeling big guns to weigh in on this one.  It is such a juicy modeling challenge.  So, I took a shot at it.  It is not perfect.  This is a challenging model, to be certain.

Here is a screencast of what I did.  There are lots of ways to address this, many almost certainly better.  The model is attached.  

So, a challenge for all the modeling gurus:  Certainly someone out there can improve on my design!

Jeff

[davebYYPCU]

Good job,  I was stuck with the early teeth area, so didn't buy in,

I was thinking more on a sweep for the larger cut than a loft,

Certainly learned from your effort, waiting for other suggestions,

(as in the real world, those cutters have undercuts for material removal,

[jeff_strater]

Good point @davebYYPCU.  I got a little wrapped around the axle on that large cut, combined with the fact that it was late, and I've been down with the flu this week.  All excuses, right 🙂

Anyway, I started out with a sweep, but tried a similar trick as the first sweep for that larger cut - along the cone of the original.  I thought that the taper effect of that larger cut was due to it not being a uniform section along the way, so started down the loft path, then had to add the rail curve, etc.  So I went back, today, and gave the sweep another try, this time, with just a simple 3D spline curve as the path.  Worked much better, and was simpler:

Jeff

[Anonymous]

Hey Jeff,

This is brilliant. Thank you so much for taking the time to make a video. I think this allows us to do everything we need and more.

Jon

[brendoncoetzer]

I realise this has been answered but I’ve modelled an editable version of a ceramic grinding mechanism in Fusion 360 that allows you to customise the deeper grooves. This is based on the more common ceramic models on the market.  
 

If you’re interested in a tutorial let me know. 

[brendoncoetzer]

Thanks for this. I used some of your techniques to achieve a similar affect for the ceramic versions which use a more rounded profile on those deeper grooves. 

[Anonymous]

perfect

[imagon57MBN]

hello, I am  very interested in a tutorial... thank you, Michal

[sottos20]

I would love to see a guide on how you came up with this! @brendoncoetzer