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Messages - SteveK

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General Mach Discussion / peck clearance height
« on: March 15, 2016, 09:48:34 PM »
i've never noticed before but tonight when i wrote a basic g83 program (g83 x 3 y 4 r.05 z-.575 q.05 f3) it rapids to .05, does a peck and retracts to .05 then up to .25
it is leaving about 1/4 inch before it starts redrilling after each peck. it cuts more air than material.  g98, g99, g73, g73 pullback...nothing matters

any help on this?

Steve K

General Mach Discussion / Re: Lathe Spindle Speed Control
« on: August 30, 2012, 12:28:21 PM »
Now I'm leaning towards having 3 'gears' on the vari drive and using the DC drive for the actual varying
I may be able to hook up the original locating switches on the screw, there are 3 positions, i believe.
i may be able to have mach switch gears somehow.

General Mach Discussion / Re: Lathe Spindle Speed Control
« on: August 30, 2012, 11:35:14 AM »
I've been a CNC operator for 25 years now, I couldn't think of the term CSS.
That's exactly what I want. ( I miss the high end machines)
I have a variable 1HP DC 1800 RPM motor (220VAC input) mounted in but I need the varidrive for facing large diameters and CCS makes things more automatic.
The vari drive also gives the spindle strength at low RPM.
I have the DC motor hooked up to the FWD/REV lever on the machine.
I do intend to use the limit switches in the vari drive, i believe there are a few along the way but i will use the top and bottom limits.

I was part of the TURBO-CNC beta group before I went to MACH.

CSS would be a really neat feature on my machine.
I attached a pic of progress....
Cutting my own XL timing pulleys, only the spindle and X is done so far....

General Mach Discussion / Re: Lathe Spindle Speed Control
« on: August 30, 2012, 10:42:19 AM »
I did find another string about using macros to contol the spindle but it used firm RPMs not variable.
I don't know how to write macros.
I was trying to think of a way to use a PLC (TECO SG2-12) to compare the pulses from MACH to the pulses coming from the actual spindle and hit the realys in the PLC to make a DC motor go up or down.
Does/will MACH even do what I require? Compare work piece diameter to RPM?
I have not seen anything about this type of operation.

General Mach Discussion / Lathe Spindle Speed Control
« on: August 30, 2012, 10:14:03 AM »
I'm new to this forum.
I'm in Yahoo and have used MACH for years now.
I'm fixing up a Hardinge lathe fo CNC.
I have changed many machines but on this one I want variable speed with the work diameter.
I how know the PWM  works but it's not as straight forward as that.
The Hardinge has a variable "V" belt spindle drive like a Bridgeport mill.
There is a 575 VAC 3 phase motor driving the screw that changes the position of the variable pulleys.
I can change the 3 PH motor to a DC motor with gears, belt, whatever
Is there a way to compare RPM with the adjusting screw location?
I've been looking and I have found nothing about a variable speed spindle compared to work piece diameter.
Any help would be appreciated.

General Mach Discussion / Servo Serial Link Feedback
« on: April 02, 2008, 08:09:00 PM »
If this is enabled does it make mach3 work the motors directly with the encoder inputs?
How do I enable this?

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