Re: 3D printer progress

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@...> wrote:

>
> Graham,
>
> Would it work as-is if you had more gantry travel?

Possibly but I already have far more travel than the length of a piece
of paper, you would probably need twice that, it would end up being a
super long machine.

> How much travel do you suppose is necessary to accomodate ALL the
> pre-print dancing?

I'll video it and then count the rotations of the paper feed motor,
well over 1m I'd say.

> And how much is required of the start-up routine?

nearly all of my travel, I forget what that is, probably 450mm

> Do these both use the same "space" in the travel?

nope.

> What is the paper sensor in the print head looking for? Is it
> a "safety" switch? Or used in overall registration?

That's only on the Epson (and possibly better HP's), it is just a
proximity sensor looking for light reflected back from the paper. It
looks for the edge and then end of the paper I think. So you could
have a black bed and paint a white box to look like the end of a piece
of paper I'm guessing.

> Thank you in advance, Don't give up!

I won't. I have the paper feed encoder connected to my propeller now,
reading an encoder is just a matter of downloading an encoder object
(though I have my own) so that's easy, I can look at the counts per
second or something to work out when the paper feed happens and then
output a stepper pulse every x encoder steps, easy! ;)

Graham