stepdirection.c (4219Bytes)
rename_to_makefile_without_extension.txt (10019Bytes)
cnc1.jpg (102720Bytes)
cnc2.jpg (118695Bytes)
IMG_0064.jpg (91642Bytes)
cnc4.jpg (72573Bytes)
cnc5.jpg (29314Bytes)
cnc6.jpg (45116Bytes)
cnc7.jpg (47402Bytes)
cnc8.jpg (42451Bytes)
Here you can find Version 2.0:
https://www.robotshop.com/letsmakerobots/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:
https://www.youtube.com/watch?v=KnkxrvKsOw4
(only x and y-axis assembled til now)
