animaliordinari: 3D printing

Showing posts with label 3D printing. Show all posts

CN milled catapult

Ever since seeing this little 3D-printed catapult, i knew i had to build a better one. so i designed a bigger and more powerfull one in aluminium.

i used Fusion 360's adaptive clearing to remove the bulk of material, then fiunished of the pieces with contouring rounds.

Here, the parts are laid out for the assembly:

The spring assembly was constructed by layers of 1mm plywood, later knitted around, so that they are still able to slide, but not separate

Of course, i had to use a 3D-printed wrench to assemble it:

The arm was riveted to the main axle:

And here it is, in all it's glory besides the smaller 3D- printed catapult, and the printer who printed the small one.

Producing the first part for my hydroponic setup

So, today i decided to produce the first part for my hydroponic setup. The part in question was the Left mounting bracket for the tubes, here marked in red.

Since this part will need to handle both twisting and downwards pressure, i did FEA analysis of the part, and changed the design until i was happy with the result:

immediately after machining the part, i had to play with it to see if it was rigid enough. Needless to say, the part snapped. The problem was that i had not taken in acount the direction of which the grain in the wood is orientated.

Disapointed with todays result, i gave up any further work, and instead pimped my office-cactus with some ultrabrigth LED's and ate chocolate.

Rigid FDM delta printer

Altough we have a few FDM printers at Bitraf, i now see the need for having my own at my office. i started to develop a small scale delta printer last week.

The printer is constructed from a plates milled from sheet of 10mm 6082 t651 aluminium.

Movement is performed by NEMA17 steppermotors, and HIWIN linear bearing rails.

This is what i have modeled so far:

As the ultimakers, this design also equips the captured nut concept, in this case M6 nuts, as seen in this cutaway:

In this cutaway, the belt tenison system can been seen in the lower left corner. Notice the stiffening bracket in the middle of the linear rail assembly, and the milled weigth reducing pockets.

These are the main components of the printer, here laid out, ready for toolpath generation.

I decided to use this project as a testcase for Fusion 360`CAM strategies, in this case adaptive clearing.

The milling bits normaly break When peak loads is achived when running into a corner. Therefore, the feedrate must be reduced for the entirety of the toolpath when using normal CAM strategies for avoiding milling bit failure:

What adaptive clearing does, is to slowly dig the milling bit into the material, before performing a series of deep cuts at maximum depth, with optimal chipload. In this way, the tool will not experience peeks in loads, as the tool will have constand load. This reduces the runtime with a suposed 40%

I will spend the next weeks experimenting further with Fusion CAM. This is my first result with adaptive clearing:

Pulsejet sled update

Finaly got the time to do some welding on the Pulsejet powered sled. i added the reinforcement bars at the back, and prepared the aluminium bracket for welding. The jet sled is currently being exhibited at NDC oslo 2016 together with my hexapod.

Hexapod

Just testing the limit on how many components you can include in a 3D preview from Autodesk 360. Quite a few apearently. The explode view function is intresting.