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konrad szwab

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I just priced it out and i was originally going to be doing a A36 prototype but i found that it is not much cheaper than 1045 Steel. So i will buy a 4' x10' sheet for the water jet at tech shop to cut to the 9"x18" sheet sizes to mill out. i also found out that my machine time has increased from the projected 2.5 hours to 5.5 hours. also tech shop is in process of moving to new location and they already moved the water jet (their biggest machine) about a month ago and has since been off limits until the move and the building is to code for people "customers" to be in it. the move starts in march 2nd and techshop will be down for 10 days until move is complete. then i will have access to the water jet and the tormach again and then i will begin machining them out. also china is back off their chinese new year so i will be ordering the bearings from there soon.

Originally i was going to take some 4" x 12" smaller plates of A36 that i have in my garage and weld them together to make a 9" x 18" sheet and grind the welds down for prototype. but i dont think that will yield a very good steel prototype. so i was going to go to 1045 sheets ordered to size however the price was outrageous as i could get a 4' x 10' sheet for what it would cost me for 5 9" x 18" sheets.

I will post a update with this information on my dev blog for the shredder so continue to monitor the blog. the blog can be found here:

 

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I just started working at a machine shop to learn more about cnc. He has a old mill that he is no longer using. It would be perfect to start machining out the shredder. It is a old production grade cnc machine. 15hp spindle 10k rpm 24 piece tool changer and 40"x20" bed. so i am going to be designing a fixture this weekend to do the shredder. The fixture is so i can run one after another. In the mean time while i am using that machine i am going to be designing a cnc plasma machine to be using at home. It is way faster and is more suited for this kind of work. But it will take a while to get it calibrated. While the mill will turn out perfect parts every time. I will see when he has time to show me more on how to use that machine it will probably be a Saturday.

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  • Ok so this is the inside scoop on the situation which is changing very rapidly.
  • SF TheShop.build was my originally going to be my go to for cutting out the shredders.
  • However something else has come up.
  • TheShop.build San Jose is going full steam ahead.
  • Supposibly the new 58,000 SF shop is going operational "Early May"
  • In this new shop to manufacture the shredder we have 3 options, cnc plasma cutter, waterjet, and the newest best option a Fiber Laser that can cut up to 1/2" steel.
  • Fiber Laser is how Dave Hakkens manufactures  his shredders and other people on his form and in his buisness Precious plastic
  • It is the precision of water jet but the cost of operation of a cnc plamsa.
  • In the mean time i am getting ready to have the shredder prototype ready for maker faire.
  • Today at the school shop i am going to be pressing the 4 bearings into the housing.
  • Then having central shop water jet cut the rest of the parts needed to build a final assembly.
  • then i am going to get into contact with the new GM of TheShop.Build san jose to figure out if indeed what i heard at the open house of san jose facility is correct and the fiber laser has the correct wattage and wavelength to cut atleast 1/4" steel.
  • If that is the case manufacturing is to begin in summer.

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I kind of gave up hope on this. I think I will continue to use my shears/woodchipper method until someone actually builds something that I can buy. It's been I think 2 years ? since i sent the money for this, hopefully I will get something before I retire in another 20.

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I put together the protytpe a few days ago. The prototype works and everything works i just dont have a machine to cut it that i have access to. paying to have it cut would cost 250 bucks a shredder. the new tech shop that i am going to have access to is supposed to have a fiber laser that can cut the steel. but they are 3 months behind schedule of opening. they were supposed to open in may. I am sort of stuck. either the shop opens to cut it or i have to build my own diy water jet. i am going to be posting a youtube video of the prototype and the status of what is going on. i will post a picture down below of the prototype.

Finished Shredder PIC.jpg

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I am willing to pay extra whatever is needed so I can have a working one so I do not have to do the shears cutting. Please let me know how much and where to send the money.

Thanks. 

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So basicly what is going to happen is that i have a box of parts that need the quare hole chased. i have cut out 8 machines worth of parts but the taper is out of tolerance to assemble. What i have decided on doing is using a modified broach for a press to chase the hole square that will turn these unusable machines into usable ones. these are going to be the ones that are sent to you guys. after this this is when the waterjet will be manufactured and that is what will be used after all 8 have been sold. now at the new shop we have a pottery kiln that will be used to heat treat.

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This is indeed breath taking. The whole project has been a disgrace. How many YEARS have passed since I sent the money for getting this stupid shredder ? Why don't you just own up to it and just tell everyone that was scammed that they will get nothing ?

Just excuses and stupid stories.

You should be ashamed of yourself.

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Here is a brief story of the project:

  • Started the project because the local makerspace had a $250,000. first time i made the product it looked good but was expensive to produce ($440).
  • The whole idea of the project was to reduce the cost of sheet steel manufactured products in low quantities down to the 125$. i was charging you guys cost. Everywhere else this size shredders are going for 600 minimum.
  • i then proceded to get the price of that waterjet down as it was 3$ a minute. I was never able to maintain usable quality down to $125.
  • Then i went to another local makerspace with a cnc plasma. Price was right but quality and finish was unusable. went through $300 sheet trying to get it in spec.
  • I then looked to china. I could not get it below $330. shipping was a problem as it was costing like $125  to ship.
  • Looked locally couldnt find anything under $330. unless there was massive quantity 100+
  • Next i went to my university to see if i could get it involved. had a full shredder made that still cost an estimated $300. on a $100,000. The finish was way better because it was a newer machine compared to one at makerspace.
  • Makerspace went out of business and there was no makerspace in my area for a year.
  • New makerspace was promising to have a Fiber Laser from Pirahna. Which i thought was to be a perfect mix between quality and cost. They never did get it.
  • Current idea is to make a custom efficient waterjet. Pump so far has cost $1000. and i can probably put the rest together for $500-$750 more.
  • Not sure if it will be efficient enough to get manufacturing cost down to $125. But the shop would pay for air it uses so I should be able to hit that price.
  • However, that is many months of testing and assembling and tuning. Right now having my job to keep money in and running a team for the senior project and finishing up my last classes before i graduate by the end of may. I think most of this development will have to wait or be very slow before graduating.

So here is what i learned from this project. the $125 manufacturing price tag is nearly impossible to make in the states (because of inflated wages). It is nearly imposible to make in china for this price because of the shipment back cost.

There is one way to meet that price

Order kickstarter style. Order a couple hundred at a time from local or Chinese source. This sure will be able to hit the  $125 dollar mark but that is about 15k upfront and not sure if the market even is there to sell 15+k worth of these small shredders

Currently, shredders like these are selling for $600. I personally don't think that they are worth this price. This is the reason why I started this project was to drop the price down of these types of machines. As me personally i don't think this shredder is worth $300+ for its size.

 

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You are absolutely correct and your story is without doubt true. I am still mad that this project is a total failure after I have been gathering boxes of plastic for 2 years and will throw them away this weekend, I am tired of the shears cutting while hoping everytime that I would have  a functional shredder to take care of this step in a less painful (literally) way.

https://www.ebay.com/itm/precious-plastic-shredder/223436164597?hash=item3405d54df5:g:aV0AAOSwmDBb8FZO 

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