Re: [CAD_CAM_EDM_DRO] HF Bandsaw converted to CNC

Hello Jon
I have to handle quite a few band saws
The best ones use an force adjustable
flow control valve that are governed by the band saw itself.
the cheap ones use a counterweight spring you adjust to your need.
Myself I am thinking for quite a while in a control where you input the material,
kind of profile and thickness. And the PLC shall govern all the variables
like blade speed, down feed, blade force etc..
But unlikely the client continues buying
second hand junk that i have to get into working condition.
There are quite a few industrial machines sold for little money.
Normally you have to invest quite a bit of hydraulic repairs to get them functioning.
Who sells a good machine?????
Some times it is better to get a conventional machine from a shop you know
and trust and make the upgrade to automatic use yourself.
Good Luck
Sven Peter


Jon Anderson 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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