My Hardware
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
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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 Gecko1x 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
<>I used Axial bearrings to make the trapezium spindle run smooth and playfree<>
<>again not the cheapest solution
<>
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
Toledo router/bovenfrees whent up in smoke
Ball bearring cage is broken blocked spindle and thus result is smoke
Cannot say the tool was bad
just bad luck the bearing stucked the spindle when i wass not arround
So bought a new cheap router this time a FERM for 40 Euro
ferm bovenfrees 850watt
its almost exactly the same as the Toledo
except this tool is 850watt
i would prefer 500watt but could not find a toledo tool again or another cheap 500 watt tool
should i add a fuse or thermal switch too prevent future smoke i case off ballbearring failure????
A smaller tool this time rebuild it with a Ferm combitool 135Watt
Rebuild with a smaller 135Watt Ferm CombiTool 5xCheaper as a Dremel tool
and the spindel is more stable (less runout) as a Dremel
Price FCT-400 18Euro (has a flexible shaft included) FCT-300 maybe even cheaper (no flexible shaft included)
Chamfer on mounting plate and tool fastening nut
This way its nice ferm fixed to mounting plate
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Total Cost, I dont wanna know (its not Cheap)
Pay and Forget
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