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

Hi Ron,
Really? Impressive!
12800 * 140ipm / 60sec = 29866 encoder transitions per second. Even at 45kHz
it's impossible to detect more than 22500 and if I my memory serves me Art
said that number should be derated a bit too.
Then again, it's only theory ;-)

Or does your board handle the actual count and sends it back to Mach3
somehow? If so that would be another thing.

Thanks in advance!
/Henrik Olsson.

PS. Nice machine!!

----- Original Message -----
From: "R Rogers" <rogersmach@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, December 07, 2005 6:37 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Electronic Lead Screw & Power
Cross Feed | Poor Man''s CNC ?


>I keep reading what Mach3 wont do in regard to encoders in theory. It's a
>bit frustrating as I see everyday what it does.
>
> A machine I recently retrofitted with Mach3 and encoder feedback to the
> PC. Put Mach in "reset" and it has a screen with nothing but DRO's for
> manual operation.
>
> Here are the specs:
>
> X and Y axis are 12,800 steps per inch, max rapid rate is 140+ ipm on
> both 5 tpi ballscrews (.200" lead) (3.2:1 belt reduction)
>
> Z axis is 20,000 steps per inch. 10 screw revs per inch. .100"lead (4:1
> belt reduction) Z rapids at 60 ipm (driving the knee).
>
> All three axis's are monitored by their encoder in Mach, if position is
> lost the machine is halted.
>
> Mach in 45 khz mode, all three axis's can be rapid simultaneously and no
> lost steps are encountered. It will actually go faster.
>
> Do the math on the above for the true pulse/count rates.
>
> The machine can be seen here, the white JET 836: (disregard my dirty
> shop..thx)
> http://machsupport.com/forum/index.php?topic=2.0
>
> The board used is at:
>
> www.rogersmachine.net
>
> Ron