Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Electronic Lead Screw & Power Cross Feed | Poor Man''s CNC ?

Thanks Ron!
Yes, mr Cullins designs seems to get top grade from the CNC community. And
I'm in no doubt that it does what it's supposed to. I just can't grasp the
speed thing, that's all ;-) .....Art, are you there??

/Henrik Olsson.

----- Original Message -----
From: "R Rogers" <rogersmach@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, December 09, 2005 1:49 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Electronic Lead Screw & Power
Cross Feed | Poor Man''s CNC ?


> Henrik,
>
> Its a breakout in a sense with optos and comparators. The macropump
> within Mach monitors the activity and triggers a feedhold if an error is
> observed.
>
> I'm not certain on how it does it in regard to speed but, if you'd like
> to see it operate at the numbers given, let me know. Jim of Sound Logic
> designed it. I just sell them and handle the support. Of course, like
> everything else he dreams up, it works great and tuff as nails.
>
>
> Thanks, Ron
>
>
>
> Henrik Olsson <henrik-olsson@...> wrote:
> Ron,
> Thanks for the clarification. I can't understand just HOW that works but
> if
> you say so....
> So what the interface is, basicly, is a breakoutboard that splits the
> encoder signals between Mach3 and (if it's a servo system) the drive. +
> aux
> relays. It's the macropump script that does the work.
>
> I once did a spindle RPM sensor and interfaced that to Mach3. Then, with
> the
> macropump I monitored the speed and shut down the machine if it was below
> a
> certain speed for more than 5 samples. I could not get that to work beyond
> ~10kHz with Mach running @25kHz. That's why I'm so curious about this.....
>
> Thanks again.
> /Henrik Olsson.
>
> ----- Original Message -----
> From: "R Rogers"
>
>
>> Hi Henrik,
>>
>> Read that from a few people.... Mach is doing all the counting out and
>> in as far as I know. The axis will stall at almost 160 ipm, right where
>> the voltage calculation-limitation of the drive dictated that it would.
>> Don't have an explanation of how it can do this in regard to speed but,
>> it
>> does it. When first started using encoder counts to monitor position, the
>> concern was timing constraints. Now they aren't given much attention
>> after
>> three machines have exceeded the 22.5k mark without any issues.
>>
>> The Jet has those folding handcranks on it, in rapid they are a blur (700
>> rpm). Thanks for the compliment on the machine.
>>
>> After using the interface, for close to a year now, I wouldn't want a
>> machine without it. It has saved so many workpieces. Some big UHMW
>> details
>> (2X6X20) I was running on one of the Bridgeports a few weeks back. Very
>> complex 3D surface and about 8 hours into the job, the X gib on the old
>> Bridgeport got free of the adjusting screw and totally locked the X
>> axis(fixed it). Normally Y and Z would have continued on and destroyed
>> the
>> part (80 ipm feed). The following error of .004" was exceeded and the
>> interface stopped the machine. Saving the part.
>>
>> Ron
>>
>> Jon, Those are very impressive numbers. Thats a nice system you have.
>
>
>
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