Re: HF Bandsaw converted to CNC

Jon,

I'm in the process of converting my cold saw to hydraulic downfeed.
Air could probably be used as well, although I like low pressure
hydraulic better. I'll adjust feed rate with a flow control valve.

The hydraulic or air method simplifies things. A relay, start
button, and a couple limit switches are all the controls needed. And
an emergency stop, of course.

Doug

--- In CAD_CAM_EDM_DRO@y..., Jon Anderson <janders@n...> wrote:
> Dan,
>
> Funny you should write about this. While I'd really like to find an
> automatic cold saw with a dead control, even that isn't going to be
> cheap. I've been thinking about converting my HV saw (an older
Clausing)
> and wondered about the feed control on the saw. If a feed rate was
> programmed that was even a bit too fast for the cut, it could cause
the
> blade to wander, or even break on deep cuts.
> I've been thinking about some form of control that would allow feed
> based on pressure. Something along the lines of the Z screw being
> attached to a mechanism whereby the saw frame would float between
two
> springs, and an adjustable micro switch would contact the frame
under
> some adjustable amount of preload. The upper spring and gravity
would
> provide down feed to the point where the two springs equalize, at
which
> point the Z motor would start feeding until getting a signal from
the
> limit switch that the desired preload level had been reached.
>
> Did you do anything like this at all, or did you just adjust feed
rates
> until you were happy with the cut?
>
> Jon