This is my first Instructable, I am primarily interested in sharing my process because i had a lot of fun with it and also want to encourage more making. A second less intrinsic reason for posting is to enter the "make it real challenge". Although i have access to some amazing tools my personal projects are always limited by the boundaries of my professional relationship. Having unmitigated access to certain technologies would give me complete freedom to pursue projects of unparalleled absurdity.
So, in a step by step personal diary format i present to you the Ice Scream Man or The Birth of Brutherford Industries.
Step 1: Content
The model started with some basic volume created in Solidworks, I prefer to start most of my digital modeling in a program like Solidworks because as far as 3-d modeling goes it is my native language and really helps me understand the scale i'm working in.
Once i have a basic form and proportion i am happy with i'll transition to another more freeform type modeling program.
In this case that program is actually called Sensable Freeform. This program is operated by a haptic sculpting device that allows you to "feel" your model and provides for a much more sculptural manipulation of your digital file.
You'll see the progression from step 1 which was a fairly controlled geometry through step 5 where i was pushing and pulling the model in to a more organic shape.
Initially i was only interested in a rendering and not an actual physical output, but once i decided to bring the product in to the real world the model made one more trip back in to Solidworks for some engineering details since i wanted to make the base and cone in two parts that had to fit together well.
Step 2: Share
As it turns out my blog had a further reach than i thought and it was imensly inspiring to get possitive feedback from strangers.
Shortly after this I joined Instagram and shared some images there and again the support from strangers Inspired me to push on.
Step 3: Prototype
The process is similar to an inkjet printer in that the machine uses liquid cartridges of resin to feed moving print heads.
After each pass of the print head the resin is cured with UV light and the print plane moves down away from the print head just a tiny bit.
The object is born in a gelatinous snot of support material that is removed in a power wash cabinet, it's like a dental water pic with the water pressure of a fire hose. After that the models take a swim in a bath of sodium hydroxide (drain cleaner) to further remove support material, then back to the power washer for a final rinse.
Once dry , i hit them with a little krylon primer and a quick topcoat, high gloss for the ice cream and matte for the cone.
Step 4: Learn and Refine
Since i didn't know i was actually going to be producing this piece when i started the original 3-d file i was just kind of winging it on scale. I dropped a ruler in my oen palm and took a guess at the size of an ice cream cone in reference, i know i have hands like a gorilla so i even made some conservative adjustments to try to be safe.
I guess i wasn't conservative enough because the prototype looked awesome but was 30% larger than a real cone.
I got my giant hand on a real ice cream cone and rescaled my model and then reprinted it.
This time i knew the printed part was going to be a master for a mold so i took a lot more care in finishing it.
Many slow coats of primer to fill the small texture that is inherent to the printing process, then a lot high grit sanding to smooth it out. This was followed by a few coats of high gloss on the ice cream to insure my mold would cast with a gloss surface and matte on the cone to get a nice contrast in material finish as well as color.
The image of the blue ice cream and grey cone is the master after all of the prep.
Step 5: Get all fired up and go way overboard
I start looking in to different ways to produce the Ice scream man in larger numbers. I could easily just source the project in china and be done with it. In fact that would likely have been cheaper and easier than where i ended up.
Instead i started scouring the internet for small manufacturing equipment, it wasn't long before i found a vintage rotocasting machine. it was a model that was widely produced in the 60's and 70's and sold to vocational schools as a training device. but is actually perfect for the scale of these types of collector toys. The story was that it was purchased by the school and never turned on...score!!! When the machine arrived it appeared that the story was true, the machine was clean and the heating elements looked like they'd never been hot unfortunately the entire unit was smashed in transit.
I was able to rebuild it, maybe later I'll do a whole instructable on rebuilding a vintage rotational molder.
For now, someone smarter than I has already created one for building a roto molder from scratch.
Step 6: Make some decisions and make some molds
I did some research and ultimately landed back where most DIY toy makers do, Urethane resin.
turns out if you process it in a standard silicone mold under rotation with a little bit of heat you get really good results.
The simplified version of building a silicone mold:
-spend a lot of time prepping your master as discusse din step 4 of this project
-define the parting line on your master with a clay wall
-1 important thing to note about a rotational casting mold is that it does not need vents or a gate as you will simply load material when the mold is open.
-build walls around your master
-mix up and degas your silicone and pour it over your piece
-remove the walls flip the mold and remove the clay wall being careful not to disturb the portion of the master now encased in silicone.
-coat all surfaces of new silicone with mold release
-build new walls
-mix, degas, pour second side
BOOM!!! Mold Done
The mold making process is standard and should be documented in it's own instructable
Oh look... it already is thanks bofthem
Step 7: GET TO WORK
I premix my color in to the resin 1 gallon at a time for consistency, then just measure part A and part B mix, pour, close the molds, load them in the machine and turn it on.
I figured out the minimum time the resin would take to gel in the molds, then the total time it took to stabilize and built enough mold cavities so i could cycle the molds out of the machine and in to a staging area as soon as the resin gelled. This cost a little more in upfront mold investment but maximized my production time.
Once the resin is set and ready to come out of the mold the product is mostly done, there is small amount of flash where the mold opens that is cleaned up with a high grit sanding disc.
the parts are cleaned up with some alcohol and the cones are bonded to the base with cyanoacrylate (super glue).
the base is stamped with our logo...maybe someone already has an instructable on making stamps?
the edition is signed , numbered and... oh crap... we need packaging.
Step 8: Packaging Solutions
One major advantage i had was, my amazing wife, Tamara Petrosino. She is a fantastic illustrator who gets my strange humor. She whipped out a kick ass graphic for the package in no time.
We played around with sourcing custom printed and die-cut materials and ultimately found a stock box that fit the product perfectly and then we were able to source a simple slip on sleeve from another local supplier.
Step 9: Now you've got a business
speak to an account and a lawyer , form an llc, s-corp or whatever else they advise
file federal and state tax paper work
if you are doing business on the web and are not a web designer and programmer (as i am not)
hire someone who is
if you're not going with an off the shelf shopping cart and payment processor (as i did not)
do your research and understand what you are getting in to
decide which payments you will accept and apply for merchant accounts with each
Decide on your shipper LEARN EVERYTHING THERE IS TO KNOW ABOUT THEM, they will be hugely important to your operation.
When all that is in order SPAM THE HELL out of anyone who has ever shown even the slightest bit of interest in what your doing.
Step 10: COUNT ALL THE MONEY!!!
Step 11: Where we stand 8 months since the inception of the Ice Scream Man
To be clear, i've said "we" quite a bit through this description, we are Brutherford Industries, Brutherford Industries is Ryan Rutherford, Tamara Petrosino, a couple cats and countless friends and family members who've assisted in everything from production to packing and shipping and sharing everything we've done all over the internet.
We had a lot of fun getting here and we plan to have a lot more fun as we keep on rolling and make more stuff.