Re: [CAD_CAM_EDM_DRO] Re: Electronic Lead Screw & Power Cross Feed | Poor CNC ?

grr...that's the problem with analogies. i put my foot
in with analogies, but i'm not gonna now immerse
myself...lol

i suppose you Can spend as much as you like to cnc a
500$ lathe...but i question the assumption that $2000
is the mean, average or normal figure - for a desktop,
certainly.

i don't see how you can synchronise lead screw and
spindle significantly cheaper or with less enjoyment
than full cnc, at least on a desktop lathe like a taig
or sherline. until the motors are in the hundreds
dollar range, they arent the main cost of such a
project.

i question the assumptions made regarding all the
difficulties of CNC. if you want to design a circuit,
you can go ahead and master orcad or altium...use your
scope and soldering station to wire up a
breadboard...or etch your own pcb...or create the
files and send out $ for one...then you can test your
board, but you still have to cnc an axis PLUS encoding
as well as the spindle encoder. well, those 2 things
have to happen for full cnc anyway, so that's even.
so you are trading off the shelf parts for a pcb
design project to test (and will probably work without
much tweaking) and to avoid the agony of attaching a
stepper to the existing cross-slide screw and a 100$
tablet pc to give you EvErYtHiNg you can gt by
designing a 'less than' circuit...and lots more...of
course, if you were to do an electronic spindle/lead
synch, yu'd get a chance to do a lot of lovely math
fun! but you can get that with cnc, too if you wanna
do it the hard way..

so that is not an effective trade (for me, with my
skills, for my purposes) but then, i already know
gcode consists mainly of the line and the arc and is
sooooo not a hairy deal to put any effort into
avoiding it...i already know all about designing a pcb
so there is no great joy or novelty in that for me and
i'll happily put my effort into what i see gets me a
better return for marginally larger cost.

i further question the assumption that $150 is the
full and complete expense for developing the
synchroniser. unless your wage is normally under 2
digits and on the RIGHT side of the decimal point,
your time is gonna have to count...

my cnc machines all have handwheels, btw. there's an
assumption i outright reject. i use manual or cnc, as
i please..

i point out that the common denominator of all these
'objections' to full cnc in favor of less, is that
they are focussed on an agenda and are non-objective.

if it's not about the cost of time or materials and is
all for fun, then hey- have fun! reinvent the frog
and have a frog! if it floats your boat, go for it!



--- "C.S. Mo" <cs@...> wrote:

> >despite all the confusing fruit metaphors that may
> >have r&d watermelons mixed in with the apples, it
> is
> >my own view that creating a circuit to accomplish
> >everything you can do with a 2$ optodetector on a
> cnc
> >rig makes about as much sense as building a plane
> with
> >no wings 'cuz of the added complexity' (well, it
> will
> >get me down the road and tha's all i need. who
> needs
> >to actually fly?!!)
>
> So what you're saying is, all those people driving
> cars should really
> get planes because that's what they *really* need?
> (And just don't know it)
>
> I, for one, would be really happy to get an
> electronic threading
> thingamajigee for $150. Would I then yearn for full
> CNC control?
> Probably yes. Do I need full CNC control? Probably
> no. Do I want to
> spend $2k on CNC'ing a $500 lathe? Definitely no.
>
> Hell - I have a ready-to-go Hardinge CHNC1 lathe bed
> w/ballscrews,
> servos (don't know if they work), turret, spindle..
> etc sitting in my
> driveway. All it needs is new controls and an
> enclosure. I'll probably
> never get around to retrofitting it because for the
> time and money I'm
> probably better off just buying an older running NC
> lathe.
>
> Anyone want a nice CHNC1 lathe bed? :)
>
> --C.S.
>
>
>
>
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