Let's Make Robots!

The Beast CNC machine II

For now it draws the shapes provided, eventually it should cut them too - actually does do cutting now :D

Hi all,

 As OddBot suggested on my blog I have created a robot page for this thing. I will update this page with more pictures schematics, code and video as soon as I have some time on my hands. 


Ok yahoo gaved in :D Added the video. Warning: It is long and boring :P

13 June 2009 - First cut

Here is a quick preview:

first cutFirst cut yey :D




















And a closeup:
























Ok engraving video added, its is 10 minutes long just skip forward when you get bored :D  Not yet used to this editor, the video is up ahead.


And the outcome below:


p1050877.jpgNot perfect but hey it is home made :D


















14 Jun 2009 - Square test

As probably Myc expected (and I kind of did) the square test reveals the following:


- I have to take the X axis apart and fix the play in it before attempting cutting a square again :)

- While at it I will check the other 2 as well

- not sure about why the straight corners come out rounded on the inside

- Right now the square is a pretty arty approximation of a square see below:D 



















- Motors do take the load pretty well and do not loose steps

- Z axis can handle the weight of the Dremel tool without problems

- software and electronics do their job pretty well now.

- hoy mate it does do cut :D

- yey my work was not for nothing after all :D

- for a badly built prototype it works pretty well 


What now?

a) take the thing apart, put it back toghether, hope it works better

b) take the thing apart, put it in the parts box, forget the mess

c)  take the thing apart, try fixing the wrongs here and there

d) take a break, start thinking wildly, draw designs, make a 3d model, etc., etc., for a Beast V2 with a better design which ensures lesser things going wrong when building it 

I'm oscillating right now between c) and d) or both, so if I do c) and get better results, parts for d) might come out of the machine. 


Oh yeah forgot one thing: 

The posibility of an extruding head for plastics, just got my hands on nichrome wire from a friend, will play at some point with that too. It would work with the current thing pretty nice because there are virtually no friction effects as with cutting.

Update 16 Jun 2009 - Fixing axis play .... right

So the good news is that the X axis is fixed, virtually no play except for the nut play which is not really fixable.

The bad news is that the Z axis design is flawed, I should have gone with four bearings instead  of three on each side. This leads to a very flimsy Z axis :( time for redoing some bearing mounts on the Z axis ... bleah


Update 17 Jun 2009 - Z-axis ... kind of fixed


Still some play there due to general flimsiness ... my Z axis design kind of sucks there :/

Time to strap on the Dremel on it again and do the square .... probably tomorrow morning (daughter fell at sleep)...




Ubdate 18 - Square Test II - The return of the Beast


Without further intro:

 Square evolution

Square evolution 

















And closer:

Squarer square


















So clearly an improvement  here ... diagonals are not equal but that I think is due to the Dremel being strapped on :)



Update 20 Jun 2009: Got real end mill bit - and the end of fixing axes 


Ok so dremel does not provide nice end mill bits here but Proxxon does :D 

I have been wandering around Bucharest looking for materials suitable for the new improved design and found out that:

- usually in the stores you buy mdf you can also get it cut for free (they have nice machines too)

- Dremel supplies suck in Romania but Proxxon rules :D (wish I had known that before I bought a Dremel)

So I got a box with 3 very nice Proxxon end mills with cutting bits of 1, 2 and 3 mm (which surprise ! have 3 mm diameter shaft and work with dremels just fine) :






















 And a small test reveals that they do cut like a hot knife trough butter :D

 And some scrap mdf from other cut for a very low sum, and the new rails I'm going to use. 

And after waisting all afternoon on fixing the Z -axis I'm giving up: I shall build new, better, improved Y and Z axis, I'm happy with the X though, I think I 'll keep that one.

Stay tuned ... more to come ...


23 Jun 2009 - The Beast is dead, long live Valkyrie 

Ok I'm done with the Beast, it proved that it can be done. Sadly and annoyingly the Beast had a pretty rough time getting build and the mistakes I've done punished me. Since Y and Z axis would have required me to rebuild almost all of it and I got tired of rebuilding it, I have decided to move on to a new and better design inspired from the same initial source buildyourcnc.com. That guy obviously hit the same obstacles and decided to take a different rails approach which is alot easyer to build.


He is using v-grooved bearings to slide onto the tracks, since I do not have those I just improvised ;) 

More to come soon .. probably in a new robot page.

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Ok, so it's not the fastest pencil mounted on 3 axises but 100% credit for succeeding! I'd love to see this as a 3d printer (perhaps with the video speed up a bit :P)

Well yeah it's slow, but not because the axis could not go any faster, they can go a lot faster.

But faster isn't always better, imagine that with the Dremel mounted on it, that is probably the highest speed you can use while cutting (that actually remains to be seen I haven't tried cutting anything yet) .

I should have genereated the gcode with a pencil in mind though :D

My wife informed me that the hair drier motor starts to show it's age so nicrome wire it is :D I might as well give it a shot with a termal extruder tool head.