Gear for Buildlog 2.0 laser cutter rotary axis

[ArtF]

Well thats just genius ..

  I had often wondered if the sound card should be used as an analogue source, they seem to have
done it well. The resin looks a bit spotty.. and I suspect they have issue with the size of the laser spot, ( focusing over
a distance can be a bugger as the spot size usually is too big..

  True genius though to tie it all together that way, salt water to hold the layer till its activated and such..

Ill keep my eye on this one, its a remarkable idea...

Art

[Mooselake]

Unfortunately Peachy hasn't been able to deliver a working product, and is two years late.  Since they posted a recent comment on KS they're still around (unlike some KS projects), but so far nothing works well enough to ship.

With a little poking around, in addition to the KS funds they raised another $75K on indigogo, and claim to have taken $166K in preorders.  Not quite a million dollars US, but after two years of development it does raise some doubt about whether or not there's enough money left over to build and ship all those promised printers.  It's astounding how much money these 3D printer campaigns raise, especially considering the number of them that never send the ordered device to those who paid for it.

Kirk

[Zebethyal]

Here is a 48 tooth GT2 gear I just printed, for the Z axis reduction gearing on my laser cutter.

You can see a slight bend in the top rim, this is where I squeezed it  to remove it from the heated bed before it had fully hardened.

The slight mess around the captive nut for the grub screw is from where I slipped with the soldering iron pushing the nut into place

The gear was generated by the Openscad script I mentioned previously from Thingiverse and exported as an STL ready to be sliced and printed - all of the required settings are already in the script - gear profile, gear height, hub diameter, hub height, bore size, number of grub screws, top and bottom retainers, etc, you just edit the settings at the beginning then render and export.

For what it does, it does it very well, however it has nowhere near the functionality of Gearotic, and you are generating a single gear in isolation, not a gear train, nor any of the many complex gear types Gearotic is capable of.

[ArtF]

Hi :

HEre's a gearotic one printed on an UP! printer..

Art

[Zebethyal]

Looks very nice is that also GT2-2 profile?

Please don't get me wrong, I am not in any way trying to knock Gearotic, I am still learning to use it and aim to use it to design some clocks and kinetic sculptures, but I have not as yet seen any options for belt retainers, hubs or retaining screws, maybe I am simply not looking hard enough.

Whilst I can add all of these in some other program like Sketchup/Rhino, etc - as I did for the first gear I posted, where I could just as easily have generated the tooth profile in Gearotic (had I had a license at the time) and then added all the other parts after the fact, which in this case I had to do anyway.

For this gear I simply wanted to cut out a few extra steps and tools in the workflow, the whole gear took about 60 seconds from initial requirement to generating the final STL file ready for printing.

That being said, the script has a very limited number of tooth profiles and can only generate one gear at a time - it is intended for generating gears for use in belt drive systems and has limited use beyond that - Gearotic is way more powerful in nearly every aspect, not least in its list of supported gear and movement types.

I am currently designing an automatic tool changer for my Mini Mill and am making use of an 8 position Geneva mechanism that will be created by Gearotic, the current one I have in the Sketchup model was drawn from first principles using a spreadsheet to do all of the calculations.

I actually created it in Gearotic, it took seconds, but then I couldn't save it as my demo had expired, this is obviously not an issue any more.

[ArtF]

Hi:

I believe it is a gt2..but its been awhile since I printed it so I cant swear to it..

  I dont usually add the hubs and such, but you can add a set screw hub for 3d printing,
though you have to drill it yourself afterwards. ( I figured printing the hole just makes it weaker..)

On the project screen, select a gear or pulley. Youll see two edit boxes on the lower properties window
labeled collar width and radius. Set them appropriately and hit respoke..

You should get a collar like this gear shows..

Art

[Zebethyal]

Thanks - that helps a lot.