Let's Make Robots!

Yet anothter "Valkyrie" clone

CNC Stuff....hopefully...
AttachmentSize
stepdirection.c4.12 KB
rename_to_makefile_without_extension.txt9.78 KB

 Here you can find Version 2.0:

http://letsmakerobots.com/node/19239

 

 


 

 

Inspired from Tinheads "Valkyrie 2.1" is started building my own CNC last weekend. Until now the X and the Y axis are ready and i also got one Motor running.

 

Differences to Tinheads CNC:

- drawer guide rails with ballbearings

- the table is moving and not the Y-axis

- Sanguino instead of Arduino

 

The Motors i'm using are from an old Tektronix Plotter. (They are nearly two years older than me... Produced Feb. 1978) They have 1.8° per step so i'm going to have a wonderfull resolution...

 


Update:

This evening i changed the leadscrew a littlebit and now the X-axis works much better. So i have now 2/3 of my cnc working ;-) It also painted an eagle file ;-) And makes funny music while doing this ;-)

I also found out that the G01 F Statement can set the feedrate higher than max. Feedrate. Is there a good reason for this? If not i'm gonna change this in the sourcecode. Editing the gcode by hand is a lot work ;-)

 

Tommorrow i will start assembling th z-axis.

 


Next Update:

 

 It's done!!! at least for now ;-)

 

 


YAU (Yet another Update):

 

Yesterday evening i tried to mill a PCB. After about 1 hour good work it started loosing steps. First on the Z-axis and then on X too. I think i will have to increase the Voltage. 'til now I'm using 5V and the motors stay cool. So there is ptential for more torque i hope. I'm driving the Motors in fullstep mode with 2 Coils powered a time. I think this is the strongest mode they can be driven...

 

 


Update: New Video


Update 14. Feb. 2010:

 

 

Today I switched over to EMC2 to control the Mill. For this I had to change the Stepperdriver Firmware a littlebit so that it will accept step/direction signals. I attached the sourcecode and the makefile to this page.

 

Result: its working really good with EMC2. I can drive all axis at double speed because EMC accelerates the Steppers so they don't loose steps.

 

 


Update 19. Feb. 2010

 

My dremel clone broke down tonight - still running but a 1mm mill-bit makes about 2mm line. You can fell that theres a little play on the bit-clamp. So i'm going to buy a new one. But now i have to make a decision dremel 300 or proxxon FBS240E or Proxxon IB/E

 

Dremel:

+ up to 40.000 RPM

+ cheap 50€

+ 125W

- they don't say anything about accuracy

- hard to mount

 

Proxxon FBS240E:

- only 20.000 RPM

+- a littlebit more expensive 60€

- 100W

+ collet-chuck (Spannfutter)

+ seems to be better mountable

- they don't say anything about accuracy

 

Proxxon IB/E:

- expensive 90€

- 100 W

- only 20.000 RPM

+ is professional mountable

+ has a high accuracy 3/100mm

 

I hope they have them all available in the hardwarestore tomorrow so that i can get hands on them. If anybody reading here has a quick suggestion, please post....


Update 26. Feb. 2010:

 

It's a Proxxon! A FBS240/E. And it seems to work quite good! But the axis speed of my mill is much to low (120 mm/min). So I decided that i need a new stepper-controller. This time with integrated current-limiting. I took a look at a lot of available circuits on the net but then I've found this one:

http://www.mechapro.de/catalog/stepper-motor-power-stages-c22/3d-step-pcb-for-3-channel-stepper-motor-board-p33/?osCsid=c58roccm0mh2b22qnuo1ogpkh0

It's just 20 Euros (PCB) and gives me some important new features: sleep and boost.  For 20 Euro i cannot make my own pcbs... (time, material, failures...) I will try 12V tomorrow. Lets see what speed i will get out of it ;-)

 

Greets

Daniel

 

 


Update 1.3.2010:

 

I installed the new stepperdriver and it was a great success! Had a little trouble with some old atx-powersupplies but now it works!

Old speed was 2mm/sec and acceleration of 1.5 mm/sec^2 on all axis

New speed:

X: 6mm/sec 10mm/sec^2

Y: 10mm/sec 13mm/sec^2

Z: 15mm/sec 20mm/sec^2

All 12V, X and Y running at 1A each, Z at 2A.

Things to change:

- find a cheap bigger powersupply 30-40V 4-5A

- exchange Motors on X and Z (the motor on Z is the strongest!!!)

- change the 8mm thread-rod on x axis to a 12mm one (to get rid of the wobbling problem.....)

 

 


Update 9.3.2010:

 

The Proxxon ist also a piece of....

Tonight it broke down. A 1mm tool makes an about 2mm hole... I will try to get my money back tomorrow. Instead of the proxxon i ordered a Kress 800FME. With this I hope I will have enough power and longtime qualitiy. The give 10 Years warranty and its a professional tool.

 

Not so good:

Last week milled a really good holder for the proxxon. But this is unusable for me now, because the kress spindel has an 43mm mount...

 

 


Update 16.3.2010:

 

 

The Kress spindle cuts everything like butter ;-) Now i can do some Aluminium too:

 

 

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It looks nice, kind of like what I started to build in the winter of 2008 back in Ro. Only I got some knowledge from this site: http://engraving.majosoft.com/html/wooden_hobby_cnc_engraving_mac.HTM and used double rails. Unfortunately I made a mistake and I abandoned the thing in my mother's attic before I packed some of my stuff and emigrated to Canada. Now I'm debating if I should build one or buy a kit. I have the Hobby CNC electronics and steppers for a 4 axis machine, but I never got the other necessary parts. Perhaps in the spring I'll start to do something...

Thanks for the link! I will perhaps use a few ideas from there.

 

Where is Ro?

 

Greets

Daniel

Good news first: it moved ;-) (only x and y-axis assembled til now)

Bad News: only with my test-program. When running with the Original Arduino code it looses many steps. I wil try to lower the feedrate this evening. 

 

I have a little trouble creating my own gcode files... can someone send me some testfiles ( a square, a circle, a square with round corners...) so that i can be sure that the files are OK?

 

Greets

Daniel

by the speed of your build. the rusty power supply and the brass nuts you used to fasten the stepper drivers make it almost steampunk.

;-) The rusty Powersupply is only for 5V Logik Power. Its an real oldschool external floppy-enclosure - Handbuild about thirty years ago and had two 5.25" Floppys inside.

 At the moment the CNC is flattenig the table. I had about 1.2mm difference on the Y-axis and about 0.5 on the x-axis. Im driving it at a feedrate of 90 so it will take a while...

 

The working area is 280mm(x) x 210mm(y) and theres potential for more on the y-axis when i change a littlebit. But for the moment its ok as it is.

 

Greets

Daniel