This time i wanted to make a bit more
proffesional
xyz table
Not like the homebuild
qbasic plotter =>
with
used or low cost parts (old dot matrix printers Etc.)
So i turned the porselin pig upside down
This is what i have so far
Did not wanted to solder
a stepper drive so
Gecko Stepper drives G210
(they are expensive but work great)
Just have to connect a
few wires
--
HEATSINK
Mounted some CPU coolers/heatsinks
=> (maybe cheaper to buy alu profile but couldnt find any)
Gecko's with PK268-E2.0B-B3 1,8deg/step nc-step
motors stays cool (even without heatsink)
But the Gecko with the bleu connectors with
another
type motor PH266M-E1.2-C8 0,9deg/step gets verry hot
Dont understand why because its less then 2 amp(1,2Amp)
(gecko instruction manual says heatsink above 3 amp)
2x Stepper motors Vexta
PK268-E2.0B-B3
Think 1.75Nm 8wires (from nc-step.de)
want to use 60VDC on the
motors (strange things steppers say 3VDC and i use 60VDC)
But this is normal to use
20 times the motor rated voltage (for
constant
current drives)
connected the motors
phases
bipolar to Gecko
1x Stepper motor Vexta
PH266M-E1.2-C8
0.9deg/step 1,2Amp
Wich i had already and will
do for zaxis
Toroid
transformer/Ringkern
trafo 230Vac=>2x45Vac 5,55A 500VA
www.Conrad.de order
nr: 518353-24
i did not know how to connect the 2x45V 5,55A
coils
parallel (=45V & double amperage)
and asked Sedlbauer
coil1
= swart-rot / coil2 = violet-weis
Answer => correct
is:
connect
1:
schwarz +
violett
0 V
connect
2:
rot +
weiß
45V 11,1A
10.000Uf 100V Capacitor
Be
carefull with large capacitors they store a shocking amount off
electricity
Im verry anctious with
them after opening a photocamera, the batterys where removed a
longtime
But the capacitor hit me
by surprise
25Amp bridge rectifier
(45VAC x 1,4 = 63VDC)
1 fuse&holder for 230Vac
side
3 x fuse&holder for 63Vdc
to Geckos
Wich should make a 63VDC 10Amp
power supply
Gecko says 67% off motors rated
Amp x 3 number off motors
I only need 5Amp but maybe
some reserve for the future
Build the parts into an old
pc486 case
Ordered steel trapezium
spindles 12x3 with bronze nuts
Maybe i wil make 2 nuts
from 1 and bolt them together with 2 or 3 screws and rubber rings so -
that i have a preloaded
nut wich eliminates the free play
Wich give a 0,0075 or 0,015
resolution (3 / 400)
And maybe a speed of 1,5
or 3 metres per minute when steppers can run at 1000Rpm
And if i made the
calculations
right =>push/pull 30Kg
FiFirst test at 1.5meterp/m and gecko on 1/10
microstep think thats 2000 positions a rotation
theoretical resolution 0.0015mm
(3 / 2000)
=16.6Khz puls rate i think
zz-axis has a M8x1.25mm
spindle because i tought motor is less powerful and heavy tool
and motor is 0.9 degree /step
theoretical resolution = 1,25(mm pitch) / 400(steps) /
10(microstep) = 0.0003125mm
Ordered 2x20mm &
2x15mm
THK liniar ballSlides and rails 600mm
The table working area
shoud be 500x500mm
Pretty expensive, but hey
you only live life once
So
ordered some 12mm wide 13mm high from THK.nl for the z axis
Would have been much cheaper if i knew that there is a lot off
>> NEW<< 12mm THK rail on EBAY
| Used Cheaper rail |
Not sure if my middle axis/nut design is stiff
enough when milling at the end of the axis
always could add 2 wires that will make it
stiff (see above drawing)
I would like to have a new engraving tool
I DO NOT like the Dremel
the Dremel spindel
is not verry stable
/play free
Toledo
router/bovenfrees (Gamma Bouwmarkt)
580Watt with 6mm and 8
mm tool holder/clamp
7000 to 32000 Rpm for only
29 Euro thats worth a try
Got a nice solid alu round shaft for mounting it on my
machine
it also has reserve/spare
brushes
A pitty i cannot find 3 - 3.2
- 4mm tool clamps
Bought
a small huvema lathe => so i can make my own clamps now
