Subject:
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Re: the LEGO CNC-Machine
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Fri, 31 Aug 2007 10:43:06 GMT
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Viewed:
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16946 times
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ok, now i understand what you mean. the problem is that this setup could be
difficult for long axes, i guess the axle with the worm gears would flex too
much...
>
> The tools can ride a disk in front of Z and move in when Z is at a tool
> change height. The disk moves in and Z can discharge the old tool. The drum
> rotates to the new tool and Z picks it up and settles down to Home position.
> Z does most of the work. You need to rotate the disk and slide it in and out
> under the spindle.
exactly what i was thinking. that's the way the machines i've seen change their
tools.
>
> This is a really ambitious idea. I think you will lose your Lego Purist
> thinking trying to cut plastic with plastic.
no! i won't mill REAL lego bricks. i meant to cut the wax/soap/whatever into the
shape of a big lego brick, more like duplo or even bigger :)
> I hope the newer gears lend
> themselves better to anti- backlash designs than the old gears. You best
> design your positioning device driven from the slide and not the drive gear
> train.
why is that? i am planning to use a pole reverser short-circuited on one side as
a rotation counter, this could allow 8 counts per revolution of the motor, that
would be a precision of 1/8 teeth, which is pretty acceptable i think. (if the
rcx manages to count all impulses)
the backlash (when changing directions) could be compensated in the software, i
just need to see how many rotations the motor has to make before the gears
engage again.
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Message has 1 Reply:
 | | Re: the LEGO CNC-Machine
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| "daniel" <daniel.formatc.at.gmail.com> wrote in message news:JnMwFu.CMs@lugnet.com... (...) I like the worm for a drive. It provides the best ratio and the least backlash. It also acts as a brake while the slide is under the pressure returned by (...) (17 years ago, 31-Aug-07, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: the LEGO CNC-Machine
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| "daniel" <daniel.formatc.at.gmail.com> wrote in message news:JnL3ox.7r9@lugnet.com... (...) As you can see, I do not know how to get "deep links" on Brick Shelf. If I figure it out I will post the links again. The tools can ride a disk in front of (...) (17 years ago, 30-Aug-07, to lugnet.robotics.rcx)
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