DC Servo Controller Board (Makerbot)
Joheinz
can anyone explain to me what the benefits of this board are?
http://store.makerbot.com/dc-servo-controller-v1-0-kit.html
I am particularily puzzled by the stepper emulation mode. Why is it
that Makerbot is so against stepper motors for the extruder? Do the
two (stepper motor support from Makerbot and the the DC Servo board)
actually relate to each other?
Markus
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Ross Mosshart
Because steppers work?
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Ross Mosshart
Stupid phone cut me off!
Stepper extruders just work, otherwise Rick wouldn't keep selling out of them!
Anyways, this contoller is more for supersized hobby servos, not really for extruder purposes...not saying you couldnt, just there are other options out there that are proven-tested.
On Feb 4, 2011 11:47 AM, "Ross Mosshart" <ross.m...@gmail.com> wrote:Because steppers work?
> > On Feb 4, 2011 11:41 AM, "Joheinz" <justj...@googlemail.com> wrote: > > Hi all, > > can anyo...
Joheinz
against them? Why release a product which even includes a stepper
emulation? I know that they are on the record for saying that the
biggest improvements are within the software, but still... why not
just offer a Stepper extruder? Half of the problems they probably
solve by software will be gone anyway.
Markus
2011/2/4 Ross Mosshart <ross.m...@gmail.com>:
Jetguy
encoder it will never ever skip steps (well not really, just never
lose absolute position). With steppers, we tell it to move a number of
steps and assume (the main problem) that it went that far. All further
movements depend on the fact the motor moved to the correct position
in the preceding command. With a servo, it will attempt to move to the
position, but no matter what, the current position is known, so even a
minor jam or catch shouldn't mess up or shift the entire print. The
main difference is feedback-in the form of a position sensor- the
current stepper drivers are all based on relative positioning based on
the initial start position. You could put feedback on a stepper, but
DC motors can have much higher travel rates and higher acceleration of
the load with no issues other than heat and current (nothing active
cooling can't fix AKA fans and heat sinks). I've been doing some
sleuthing and think the parts from HP DeskJet 672C printers could be
perfect motors for this application as X-Y motors in a MakerBot. This
printer is unique in that it used GT2 belts and pulleys just like
makerbots-so the large 550 size DC motor can easily be adapted to bolt
in place of the steppers. The only change I believe will be required
is the driver will be changed to the 31 volt power supply of the HP
printer rather than 12 volts normally- but this is a built in
capability of the DC driver board. Inject printers have some pretty
impressive carriage speeds, so this could be really cool. Again, the
biggest cool factor is to never ever have a print shifted again, it
may have errors from a jam, but no more completely failed prints
(unless you just get crazy with it).
> can anyone explain to me what the benefits of this board are?http://store.makerbot.com/dc-servo-controller-v1-0-kit.html
Luis Rodriguez
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Luis Rodriguez
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