In a message dated 6/18/2003 1:21:55 PM Central Standard Time,
gmanca101@... writes:
never consider one for plotting something that required the mechanical resolution
of a PCB, particularly a double- or multi-sided one!
If your need is "professional enough" that you require plotter-drawn artwork,
then you must simply go BUY what you need!
If your need is avocational, and/or only very occasional, the use of
manually-applied Bishop Graphics PC-component patterns to 0.1" grid paper is not yet
considered a mortal sin!
An acquaintance who worked for a large chemical firm GAVE me a like-new 7475
that his employer was "throwing out"! I removed the cover to clean it with
solvent, and dust-out the innards, and I saw that it moved the paper with RUBBER
ROLLERS, and the quill across the page with a RUBBER "timing belt" with
considerable "wiggle and flop". And both of those axes were moved by little DC
servo-motors with "shaft encoders" and custom "electronics". This may have been
an acceptable mechanism for moving a felt-tip pen about on smooth paper, but
NOT for plotting something like PCB art! NO way! Now I grant you, I DID
repeat the buillt-in Demo-Plot on the same sheet of paper, and it repeated all
probably within 0.01", or even better---hard to tell, running a PEN about over
paper! I put an ad on e-bay, and sold it to an artist in a State far, far away
in a few hours! NO regrets!
Jan Rowland
[Non-text portions of this message have been removed]
gmanca101@... writes:
> I have an HP 7475AThat kind of plotter may be fine for plotting graphics on PAPER, but I'd
> plotter that will never plot in alignment.
never consider one for plotting something that required the mechanical resolution
of a PCB, particularly a double- or multi-sided one!
If your need is "professional enough" that you require plotter-drawn artwork,
then you must simply go BUY what you need!
If your need is avocational, and/or only very occasional, the use of
manually-applied Bishop Graphics PC-component patterns to 0.1" grid paper is not yet
considered a mortal sin!
An acquaintance who worked for a large chemical firm GAVE me a like-new 7475
that his employer was "throwing out"! I removed the cover to clean it with
solvent, and dust-out the innards, and I saw that it moved the paper with RUBBER
ROLLERS, and the quill across the page with a RUBBER "timing belt" with
considerable "wiggle and flop". And both of those axes were moved by little DC
servo-motors with "shaft encoders" and custom "electronics". This may have been
an acceptable mechanism for moving a felt-tip pen about on smooth paper, but
NOT for plotting something like PCB art! NO way! Now I grant you, I DID
repeat the buillt-in Demo-Plot on the same sheet of paper, and it repeated all
probably within 0.01", or even better---hard to tell, running a PEN about over
paper! I put an ad on e-bay, and sold it to an artist in a State far, far away
in a few hours! NO regrets!
Jan Rowland
[Non-text portions of this message have been removed]