Re: [CAD_CAM_EDM_DRO] Re: HF Bandsaw converted to CNC

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
>
>
>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems, for CAD, CAM, EDM, and DRO.

>
>Addresses:
>Post message: CAD_CAM_EDM_DRO@yahoogroups.com
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
>Moderator: jmelson@... timg@... [Moderator]
>URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>bill,
>List Manager
>
>FAQ: http://www.ktmarketing.com/faq.html
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>