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1

General Mach Discussion / Lathe G83/M1083

« on: March 28, 2012, 06:11:28 PM »

Been experimenting and reading up on lathe G83 and G83.1 peck cycle. I believe
it was changed a few years back to also support G83.1 using a parameter C in the
command.

These two lines behave exactly the same, why? C should change things
according to the note in the M1083 macro file. (further down in the M1083 file
it refers to C as "taper" which is confusing!!!)

G83 X0 Z-1.0 Q.15 R.2 C0 F.002
G83 X0 Z-1.0 Q.15 R.2 C1 F.002

both enter at the commanded feedrate (.002) all the way in and retract fully
each peck. If I read it right, that is what the C parameter should change.

I would like to either not retract fully each peck OR after a full retract,
rapid in to just above the last peck depth.

Doing it the way it works now gets it done BUT is slow as hell.

Hopefully someone can steer me in the right direction.   
Thanks,
George

2

General Mach Discussion / $20 ebay PCMCIA parallel port that works with mach

« on: February 22, 2009, 08:42:39 AM »

  Figured I would post this for those searching for such info.  I searched extensively and found a post on cnczone over a year old where someone used a cheapo pcmcia card with success.

  First, I realize laptops and add on pcmcia parallel ports are not recommended with mach BUT there are many using them with success.  My HP laptop actually puts out cleaner pulses than my desktop did.  Of course I had to disable all the power management features.  I now have the cnc bug bad and am going to be adding a VFD, another stepper axis, a tool touch plate and more to come I am sure but was out of pins on the bob.

Here is a link to the $20 board.   http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=370146495921

I installed it per the directions and it installed as LPT3 at address FCE8 which I found could not be changed.  So, I just entered that address into mach's port 2 address and tested.   I ran my present mill setup from it just fine, no apparent problems. Motors, spindle relay, coolant, all worked just fine.

Figured this info may be usefull to those searching.   I'll post it on the yahoo group also.