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

Since were talking two different types of saws here, sholud I presume the HF
stands for "horizontal feed"?
If so, that would explain why the rest of you get more accurate cuts than I
do with my cutoff saw.

Smoke

>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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