Re: [CAD_CAM_EDM_DRO] Re: What makes step and dir?

Hi Daves,

There is a 555 timer circuit WITH RAMPING in the photos section of the
SherlineCNC list. Look under "circuits":

http://photos.groups.yahoo.com/group/SherlineCNC/lst

(partial URL, you wouldn't believe how long the full one is).

Alan KM6VV


turbulatordude wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Dave Shiels <dshiels@e...> wrote:
>
>>>>Hi, I have only posted a few times and was asked a question that I
>>>>couldnt answer: I was wondering if I wanted to make a machine that
>>>>made one move in the X direction then back to cut slots. What could
>>
>>>I
>>
>>>>>use to make the step and direction to Geko drives that power
>
> steppers?
>
>>>>>In the past I have always used a PC based CNC, but I really wouldnt
>>>>>need to have the features and flexibility of a CNC because I
>
> want to
>
>>>>>go one direction and a fixed amount and then back.
>>>>>
>>>>>Can a plc do step and direction or is there another simple way
>
> to do
>
>>>>>one move and back? Thanks for any input.
>>>>>
>>>>>Dave Harhay
>>>
>>>
>>>
>>
>>Still the PC is going to be the cheapest way to do this. A cheapo
>>mother board
>>can be integrated right into the controller and use turbocnc on a IDEto
>>CF disk
>>to make it solid state.
>>A single step and dir board off one of the web sites and a re-use PC
>>would work
>>the trick, not require and special programing and be quite cost
>
> effective.
>
>
> I disagree with the pricing part.
>
> A simple 555 could be set to generate the pulses (no ramping) and a
> DPDT relay could be connected to set direction. then end switches
> control the rest.
>
> If, all he is doing it moving out and back on the same axis, then
> anything CNC is pretty sophistacated technology.
>
> BUT, I would agree 100% that a cheap laptop could do the work in the
> easiest to run time and costing.
>
> TurboCNC on an old 486-66 laptop would run acceptabley. Easily the
> fastest to get from the parts to making chips.
>
> And, very inexpensive at that.
>
> Dave
>