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Topics - JohnHaine

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41
General Mach Discussion / Help with Spindle Index please
« on: December 15, 2009, 05:41:23 PM »
Hi all, well I'm slowly getting the rest of my lathe functions up.  I've added a slotted sensor with opto-interruptor (salvaged from an old printer) to the spindle, and this seems to operate in that the LED on the diags screen goes off or comes on (depending on active low setting) as the slot passes the beam.  However when the spindle runs the S_true DRO doesn't show the speed, only a steady zero!  When running the LED blinks occasionally which doesn't surprise me as presumably the PC is sampling it and won't see all the pulses.

I haven't checked the pulse width as delivered to the breakout board but the slot width was calculated to comfortably exceed the Mach3 minimum requirement - would need to break out my old 'scope which hasn't been switched on in 10 years for this! (what an excuse...) - before I do this has anyone met this problem before and could suggest a solution please?

Thanks,

John.

42
Feature Requests / Reverse jog on Shuttle / Express / Pro
« on: December 13, 2009, 09:01:42 AM »
On the lathe, when correctly set up the wheel on the Shuttle when turned CLOCKWISE moves the carriage towards the tailstock, or if the X - axis is selected turns the feed screw ANTI-clockwise which moves the tool AWAY from the work.  The former behaviour is intuitive but the latter is the opposite of what one expects.  An option to reverse this would be extremely useful.

Please could this be considered as an option for a later release?

Thanks,

John.

43
General Mach Discussion / Shuttle Express problem - help please
« on: December 06, 2009, 04:36:27 AM »
When I first set up Mach on my lathe and installed the Shuttle plug-in, the motor directions (for jog and G-Code directed moves) was wrong so I fixed that in the "ports and pins" dialogue.  However whilst the Z-Axis moves correctly under the Shuttle Express controls, the X-axis moves the wrong way at least with the jog wheels (both inner and outer).  Also the outer wheel (which produces continuous movement at a speed depending on how far the wheel is turned) only produces movement at small discrete positions rather than the speed changing reasonably smoothly depending on deflection.  Trying to fix this by selecting "reverse X" tick-box doesn't work.

Please could anyone suggest how to fix this problem?  One way I guess might be to re-install the plug-in, but I'm not sure how to de-install it first!

TIA for any help,

John.

44
General Mach Discussion / Newbie problem with Mach3 Turn
« on: November 30, 2009, 05:30:20 PM »
Hi, I wonder if I could tap the collective wisdom on a problem I'm having?  I've got the mechanical conversion of my Super-7 done and built the electronics and everything seems to work fine in "manual" - it jogs properly and accurately and all seems OK.

Then I started to try actual CNC turning and have met a problem.  I started with a piece of 1" bar, to turn down to a shoulder a 10mm long spigot 20mm diameter.  I set the tool origin to Z=0 at the end face of the bar; and X=25.4 diameter on the diameter.  I set the rough cutting to 0.25mm depth and 15 mm speed; and the finish cut to 0.1mm and 5mm; clearance was set to 1mm.

When I set the spindle running and fire off the cycle, it takes the first cut fine; but when it gets to the end it feeds the tool firmly INTO the work and quickly returns the Z axis taking off some very thick swarf in the process!  At that point I pressed the estop in a panic.  It has happened a couple of times...

Could anyone give any pointers as to what I'm doing wrong please?

I should say that I've been really impressed by loading and setting up Mach3, it's a great piece of work and I can see that I'll be spending a lot of time re-learning the lathe!

Thanks, John.

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