Re: HF Bandsaw converted to CNC

Smoke,

My conversion is on a cold saw. Unlike a bandsaw these things won't
gravity feed. Depending on what's being cut the operator may have to
exert a fair amount of downward force on the operating lever. The
force could easily be 50 pounds or more. Gets really old if you have
a number of cuts to make.

Doug

--- In CAD_CAM_EDM_DRO@y..., "Smoke" <gordonr@r...> wrote:
> Why all the controls? All mine has is a hydraulic cylinder, a flow
control
> valve and a shut off valve. The shutoff valve is used to hold the
saw in a
> partially raised position while adjusting the work. The flow control
> controls the rate of down feed.
>
> No relays, switches, etc required.
>
> Smoke
>
>
>
> >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
> >
> >
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