Friday, December 25, 2015

3D Printer Parts that are 3D Printed

Machines making machines..

This is a filament extruder prototype.  Started drawing at 7am, had first prototype made by 9 and final design by noon.

All in house desktop manufacturing.

3D printing an entire set of of printer parts this weekend.

The beauty of these machines is that if you need more, you can make them pretty easily.

My current line of experimentation is leading me towards as much in house fabrication as possible.

The new linear printed guides will be used with this machine.  Frame for this one is Bosch extruded aluminum. 

Next iteration will use a different lower cost type of profile aluminum and since I am nearly out of linear guide rod from China, I will start sourcing locally guide rods from a hydraulic shop.

My printed guide run smoother and has less backlash than my commercial sourced linear guides. 

Wednesday, December 23, 2015

Blinding Laser Weapons

Chinese Military Using Blinding Laser Weapons

China’s military has equipped its forces with blinding laser weapons in apparent violation of an international agreement signed by Beijing. “China has been updating its home-made blinding laser weapons in recent years to meet the needs of different combat operations,” the official military newspaper PLA Daily reported Dec. 9.

Tuesday, December 22, 2015

Desktop Manufacturing

Once the politicians figure out and the public figures out exactly how disruptive a desktop manufacturing facility can be, they will require the registration and regulation of it.

Look at what they are doing to RC toy airplanes...

This is Why You Need a Starter 3D Printer

For the last week off and on in between a bunch of other stuff here, I have been thinking about how to make these linear guides for CNC machines.

 I have a whole boatload of different designs to use, from expensive commercial stuff, to cheap and everything in between. However, due to a few self imposed limitations for my designs, I was looking for something that is cheap, like super cheap.

When I started building my latest 3D printer, (Of which I probably will have 3-5 identical units by the time i am done) I dug into my big box of bearings ordered last year from China. I printed parts and bolted the China bearings to them. Only to find that the China stuff I paid a lot of cash for, had a large quantity of crap parts. Gritty bearings, loose tolerances, and the mounting holes are all off. Nothing was the same.

So I started looking at how I can make my own. I came across a old article from the reprap guys describing how they were making 3D printed PLA bushings and were getting well over a year of use out of them.
So my interest piqued, I started researching and yesterday bought a kilo of Esun natural color PLA filament along with a can of silicone lube spray. I designed and printed all day today to come up with this:

Now you are asking yourself what is that?

It is a 3D printed linear guide.  This is the part that makes your machine move up down, left, right and mattached to a mechanism like a belt, chain, ball screw, or threaded rod, will let you make real stuff.

Every milling machine, and lathe has one form or another of a linear guide in it. 

The machine shop seed will give you the tools and parts to build bigger and better machines.

For example the China linear guides come in metric sizes, but polished stainless steel pipe comes in english sizes.

Now if you cherry pick thru the stock of a stainless supplier, you should be able to find enough straight material to make your own guides in english measurements.

For this particular design here are the tech specs:

Black block is ABS+ plastic printed at 230C and 0.3mm layer height

The white bushing is Esun PLA printed at 0.3mm layer height, at 207C and was hand fitted by using a 12mm drill bit clamped into the bench vice to hand ream it to fit.
The bushing was printed with 2 perimeter, 50% infill 3 solid bottom layers and zero top layers cause that part is hidden and being open allows the silicone to soak all thru the piece.

To do the same with 1 inch stainless steel mirror finish pipe, you draw the same shape black part in CAD but larger (obviously) and you then draw a smaller bushing insert for it.  The bushing contacts the rod only at the ends and for only 6mm on this particular design.

You will have to make several test prints to make it fit properly.  I print mine just a tiny bit tight then hand ream it out with a drill bit.

Monday, December 21, 2015

Killer Chicken

One of my other hobbies is gourmet food cooking.

Experimented with curing salt for the first time this week.

4 day cure for a chicken and slow cook.

With a dash of bullion, brandy, salt and a tablespoon of nitrate.

Awesome stuff. 

Much better than store bought cause it is fresh, and damn cheap vs buying someone else work.

It comes out light pink like ham.

Texture is like high grade deli chicken breast but the whole chicken tastes that way.

3D Printed Knife

Some "love" sent by PM to me by a Demon

Not the first time they sent me messages.

Hell I had a lot worse in middle east.

However if you really want to mess with their heads...

There is a way to make them go ballistic.

That is by sending a reply in the form of a copy of a exorcism prayer or the Christian statement of faith.

This is because they are so backwards and superstitious   that they will receive the prayer as a greater insult than any threat of violence.

You could go on by telling him that his wudu is weak and he is full of jinns, etc.  Have fun with it.

3D Printer Filament and the Machine Shop Seed

For the last several days, I have been working on making some products to sell that are 3D printed.  Namely one of those little knives that fits in a sheath and hangs by a lanyard from the neck.

They are popular among Filipinos because they can be worn inside the shirt and accessible even when packed into a crowded jeep as getting to your pockets is quite difficult in the cramped sitting position.

So after a few prototypes using regular ABS plastic, I ran out.  So I called up the local distributor and he had this new stuff in.  It is called ABS+.  Now I heard some hype about it, how it was supposed to be a little stronger and did not warp as readily as regular ABS during printing. 

I personally am not fond of ABS much because it is a serious pain to get dimension tolerances anything near what I need for a lot of projects aside from art stuff that no one cares about.

I just got home, loaded up the machine and printed out a couple neck knives.  I must say, yeah the it really did live up to the hype.  It is not as shiny as regular ABS and printed perfect the second try.  (First try I was a little careless and did not check to see if the adhesive was done properly)

So it looks like this ABS+ stuff is the thing if you want to print some good stuff.

This brings me to my machine shop seed project.

Last items arrived from China, and documentation will commence more than likely after Christmas.

Along the way I was searching for any edge to lower the costs of a printer.  One of my biggest costs is the linear guides. 

Normally I buy from China, and I take a 100% markup once tax and shipping are included cause these things are HEAVY.

So I started researching on how to make my own using stainless steel rod and bushings. 

I can buy half inch stainless rod really cheap and it is a shiny smooth finish.  The sellers let me cherry pick thru the stock to find the straightest stuff.

However there are no linear bearings for english sizes rod.  Not anything affordable anyways.  So i am left with a couple options.

One, I can drill some HDPE, Delrin or Brass and make a bushing. 

Two, I can 3D print one from PLA or that new bushing filament from Igus.  Pla works nice however, no as good as the IGUS stuff, but I deal with cheapskates and they do not want to pay much, so PLA it is.

However this got me to thinking about silicone impregnated bushings.  After researching them, It took me half a day of Google-Fu to find out exactly how lubricant impregnated plastics are made.

The trick is a vacuum chamber.  So I am now thirsting for a foodsaver with the vacuum canister to try this and a liter of silicone lube oil.  Total costs are around $200 for this experiment so it may take me a few weeks to scrounge up the cash.