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Messages - ryckmans_t

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31
wow clever program.Thank you!

Thomas

32
Hi folks,

I have inherited a XY table that was use to taked samples from a plate. The axis can move about 24 x 17 inches or 60 x 45 cm. The X stepper drives a belt, the Y stepper drives a long lineshaft(?) along the X axis, that in turns drive a belt. The steppers are PK268-03B (3V, 3A, 200 steps per turn) - datasheet attached (see page 241) if it helps.

How do I set my "Motor Tuning" variables, since I don't know the specs of the belts and the lineshaft?
The wheel (sorry don't know the proper term) driving the belt has 32 teeth, the belt has 1 tooth every 5mm... I guess it means that one turn of the wheel should move 32 belt teeth, or 16 cm... but if I turn the stepper manually one full revolution the X carriage moves about 8-9 cm (some calculations must be wrong here...)

So I assumed 3200 steps for 80 mm, or 40 steps per mm. If I use these settings... the steppers get noisy, but nothing moves.

Also, the table tends to vibrate at lower speeds... is there a rule of thumb for smooth operations?

many thanks for your help -

Thomas

33
Thanks, very useful to know. I'll probably stick to my current drivers and PSU then!

Thanks to everyone for your time and suggestions!

Thomas

34
From the Gecko website, the PSU should deliver "anything between 4 to 20 times the listed voltage" so in my case I am at 10 times, not too bad...

cheers

Thomas

35
Thanks Hood,

Just wondering if I should spend an extra 50 quids to get bigger drivers, then extra to get bigger PSU as well...

cheers

Thomas

36
Great, thank you.
So if I just look at DC voltage I would need 3.8V * 20 = 76V minimum, and the maximum voltage 3.8V * 25 =95V
So I would need a 80V DC PSU

as for the amps, even using the parallel connection I would need maximum 3 * 6A * 0.67 or 12A

I have 36V 10A, which is below both ratings...

what will be the impact of this? Is it just going to be speed and torque? In that case it may be okay - I don't think I need all the power for a simple XY table...
Also, where can I find a 80V PSU? I found a 48V 12A PSU, marginally better than the 36V 10A one I have...

The driver my seller is ready to exchange my current ones for is here:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&isIU=1&item=180824312186
and can take AC voltage at 60V - so I would need a transformer to supply that. It should be 80V * 12 A or almost 1000VA!

what do you think??

many thanks

Thomas

37
Hello,

I'd like to power 3 steppers motors FL86STH80-4208A (4 phases, 4.2 A per phase), datasheet attached. I will only use 2 steppers in the near future, but would like to be able to add a third later. The wiring I am using at the moment is bipolar (parallel) connection... The steppers will be used for relatively light work (for example a sand plotter as shown by Bruce Shapiro), maybe a small mill.

I think my steppers are well over specs for my actual needs, but I have two of them and would like to avoid buying more steppers.

My question is about the power supply I need and the amp rating of the drivers
(datasheet attached) ... my online seller first told me that a 36V 10A power supply and  4.2 A (max) drivers were fine for this, ... Is this right?

From the specs of the stepper in parallel connection I apparently need 6A (4.2 * 1.4) A ... so it looks like 6 * 3 = 18A. So my power supply looks too small

As for the drivers the max amperage is 4.2A - this again looks under-powered if I use the stepper in parallel connection...

Now the seller is okay swapping my drivers (at a cost) for drivers that can handle up to 7.2A (http://www.ebay.co.uk/itm/CNC-Mill-Router-DIY-Stepper-Driver-Board-Controller-MA860H-2-6A-7-2A-24V-110V-DC-/270917084995)

Should I do this, and also get a new power supply? What power supply would you recommend?

many thanks

Thomas

38
General Mach Discussion / Re: newbie - help needed please
« on: March 04, 2012, 05:11:22 PM »
yes you did - but since both 3-16 and 16-3 were quoted you are only 50% right!

thanks for your help... I am sure I will have more questions soon. I struck gold Friday, my company threw away an auto sampler - which basically is a XY table 60cm by 40 cm.
The steppers work fine - I hope to be able to add a Z axis soon

Thomas

39
General Mach Discussion / Re: newbie - help needed please
« on: March 04, 2012, 04:31:23 PM »
"Y not working" solved - the datasheet said step pin for Y was 3 and Dirpin was 16 - it is just the reverse

%%^##' datasheet

thanks for putting up with me so far...

T

40
General Mach Discussion / Re: newbie - help needed please
« on: March 04, 2012, 04:24:19 PM »
okay...

now I connected my second stepper to the Y axis... set up everything as for X (which is working)...
but Y does not move at all.
I swapped the drivers - X still works... so both drivers are okay
swapped the connections (Y stepper plugged on X driver, X stepper on Y driver) --> Y works but not X... so the stepper works...

so it looks the issue is upstream from the stepper or the driver...

anything I could do here?

many thanks

Thomas

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