Re: [CAD_CAM_EDM_DRO] Re: Digitizing arm?

Don,

If you're looking for a board to bring 4 encoders into the PC with Mach3, I sell one. It can be seen here:

http://www.rogersmachine.net

Thanks, Ron

Don C <tekno62@...> wrote:

Im on the CNC zone also. so have been reading, from what I have been
looking at today and if I have done my math right the 5k encoders
that I have would be .072 deg per tick. With an arm of 3 feet (6 foot
radius)that breaks down to about .04" per tick. for a first try I
would think that it would be good. My main problem is getting the
data from the encoders to the computer. I found a site that talks
about using a pic chip as the interface. then I have to see if I can
get the 3 - 4 encoders in via USB. I would like to make it mobile and
something that can be DIYed.

BTW I have learned alot from your site. thanks

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Don C" <tekno62@> wrote:
> > I join this forum as one of the sites " LINK "
> > <http://www.indoor.flyer.co.uk/digiarm.htm> I found talk about
> > modifying a DRO program. Im hoping that someone is willing to

help me

> > along with this. I just need to be pointed in the right direction

and

> > hate to reinvent the wheel.
> >
>
> That's my site. I had some fun discussing the idea on CNCzone. At
> the time the real sticking point was encoder resolution, we decided
> that you would probably want something around 50000 pulse per rev

even

> for fairly inaccurate scans. That cost money.
>
> Having said that if you look at the relevant forum on the CNC zone
> there is a thread about a 16bit absolute encoder now available that

if

> bought in quanity is VERY VERY cheap. You then just need very good
> bearings and some carbon fibre tubing. If I were to do it I'd look

at

> writing a plug-in for rhino to take the points, there is a wizard in
> the SDK for that sort of thing though you need to do the matrix

stuff etc.

>
> Nothing's easy :(
>
> Graham
>

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