Models Suitable for Display

Tom Ligon · Post by **Tom Ligon** » Mon Aug 22, 2011 2:37 pm

Ladajo,

That sounds like a good bet. Almost any waterbased paint or coating would confer some protection of the foam from the solvents common in metallic paints. These foam cores typically have a skin that can almost tolerate a light spray even without help, although pitting is a likely outcome.

rjaypeters · Post by **rjaypeters** » Mon Aug 22, 2011 9:42 pm

Tom,
I was about to recommend fiber-reinforcement of the toroids, but that would be an unwelcome diversion for someone who wants to build a working model!

rjaypeters · Post by **rjaypeters** » Mon Aug 22, 2011 10:42 pm

10 cm Atomic Fusion Wibblefall:

http://www.shapeways.com/model/318925/a ... tml?gid=mg

in Black strong-and-flexible: $131!

in Black detail $207

rjaypeters · Post by **rjaypeters** » Mon Aug 22, 2011 11:47 pm

And the limited data set is complete with a lovely parabolic relationship between model diameter and price:

I'm tempted, but not that tempted, to see how things go with an interval of 25mm.

rjaypeters · Post by **rjaypeters** » Tue Aug 23, 2011 9:46 am

If one wishes to see the Platonic ideal of a working machine, how about this?

The lengths of the spikes are such the core can be in the center of the rings if the bottom "spike" is trimmed.

If anyone is interested, I'd even put in the cusps located directly between each ring pair.

Giorgio · Post by **Giorgio** » Tue Aug 23, 2011 11:00 am

rjaypeters wrote:If anyone is interested, I'd even put in the cusps located directly between each ring pair.

You are really tempting me

rjaypeters · Post by **rjaypeters** » Tue Aug 23, 2011 11:32 am

Giorgio wrote:I am asking on i.materialise.com, let's see if the price is sensibly different or not.

What about the titanium?

re Platonic Ideal: I'm curious if what I designed above is printable. I won't submit the design until I've added the ring-pair cusps since Giorgio seems interested.

It might work better to let the customer assemble parts.

Giorgio · Post by **Giorgio** » Tue Aug 23, 2011 12:38 pm

rjaypeters wrote:What about the titanium?

I am still waiting for a quotation from them as Titanium quotation is not available online.

By the way, I just noticed that the 20 cm model you uploaded on shapeways is 15,2 cm.
http://www.shapeways.com/model/317836/

DeltaV · Post by **DeltaV** » Tue Aug 23, 2011 3:39 pm

I think you need to increase the gaps between magrid coils a smidge.

Also, standard nubs would provide less intercept area, in a better-shielded zone.

I'd prefer wall-mounting the coils, but the Shapeways price for adding chamber and supports would be through the roof.

rjaypeters · Post by **rjaypeters** » Tue Aug 23, 2011 11:45 pm

Giorgio wrote:By the way, I just noticed that the 20 cm model you uploaded on shapeways is 15,2 cm.

That's what I get for doing things in a hurry! If we decide to go this way, I'll be sure to give full measure across the rings.

Besides wasn't the price high enough?

rjaypeters · Post by **rjaypeters** » Wed Aug 24, 2011 12:15 am

DeltaV wrote:I'd prefer wall-mounting the coils, but the Shapeways price for adding chamber and supports would be through the roof.

So would I. I started to design wall-mounts for the coils, but stopped because I think they would detract from what we want to see.

I have thought of using anti-nubs to connect the rings together:

But I will probably go with two small cylindrical connectors per ring pair with the cusp leakage coming out between the cylinders and the ring-close approach. So you, sort-of, get your wish.

Also, the core and cusp leaks will probably be customer-assembled so the ring-close-approach leaks can be inserted skinny end from the inside of the rings and then attached to the core piece. So I'll be asking the Shapeways forum for advice or experimenting on ball-stud connectors to get things just right.

For how many may we sign you up? 15 cm or 20? BTW, I'm not making any money off these (what am I saying!) so it's not like your hard-earned money is supporting a bad cause.

rjaypeters · Post by **rjaypeters** » Wed Aug 24, 2011 1:19 am

Like this:

Now for the core.

rjaypeters · Post by **rjaypeters** » Wed Aug 24, 2011 1:48 am

With cusp leaks:

Giorgio · Post by **Giorgio** » Wed Aug 24, 2011 8:38 am

rjaypeters wrote:Besides wasn't the price high enough?

It was, i just wanted to advise you in case you wanted to fix your relationship between model diameter and price.

I had a quick chat with someone from i.materialise.com and I think that their quotation for the titanium will be on the level of several thousands dollars.

I started to enquiry for a kidney sale at my local hospital....

rjaypeters · Post by **rjaypeters** » Wed Aug 24, 2011 9:42 am

Almost there: