Messages

1

General Mach Discussion / Re: Mach3 Turn all moves are rapid after feedhold

« on: October 05, 2009, 02:51:27 AM »

Thank you for looking at this for me.  As you suggested I've temporarily turned off the closed loop control and the problem goes away. I guess I will therefore have to continue with F in each line.

2

General Mach Discussion / Re: Mach3 Turn all moves are rapid after feedhold

« on: October 02, 2009, 02:42:58 AM »

So you have the full picture, here is the offending g code. If you feedhold at any time during T0101 and resume then you will see the feed change from 0.2mm / Rev to 340mm / Rev !   (I expect I have done something very obviously wrong !)

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General Mach Discussion / Re: Mach3 Turn all moves are rapid after feedhold

« on: October 02, 2009, 02:18:42 AM »

Many thanks for taking the time to reply. I've been using G96 Feed per Revolution .xml is attached, appreciate if you could comment on it.  The other problem you may be able to advise on is spindle settings. I've tried many different settings to achieve the full 10 volt output to inverter, the problem being that this would drop back about 0.5 volts during rapid moves of X or Z axis and therefore spindle speed would also drop slightly. The settings here work but I also had to alter P.I.D. settings a fair bit as with the default settings it was taking about 40 seconds to get the programmed speed ! There is now some overshoot for a few seconds especially upon increasing spindle speed. Threading seems to work ok though. Many thanks, Nick

4

General Mach Discussion / Mach3 Turn all moves are rapid after feedhold

« on: October 01, 2009, 03:42:01 AM »

Wondering if anyone can advise why, after a Feedhold, and then restarting with Cycle Start, all G1 moves become rapids ?  At the moment I have overcome the problem by making the F command non modal so it's repeated in every line.  Perhaps this is a requirement for Mach ?  Any advice appreciated !

5

General Mach Discussion / Re: Orac Lives

« on: September 18, 2009, 04:08:23 AM »

Yes I think MT5 taper is pushing it a bit for the Orac, not too large for the Dean Smith & Grace though ! There is also a Bridgeport Romi CNC lathe in the shop which unusually is PC based (but with closed loop control and DC servos). These machines have a some very user friendly functions. One of the most useful ,which would be great in Mach, is the ability to quickly define "stops". For example, say you wanted to cut a groove a certain width and depth you could quickly set stops for min diameter and min and max Z. Then machine the groove using the handwheels like a manual lathe, but the axis movement will not go past the "stops" you have defined. i.e. When you reach those limits you can just keep turning the handwheels and nothing happens. It's not even necessary to look at the DRO's. I don't know how difficult this would be to introduce into the Mach software but it would be very useful for machines fitted with handwheels. Another feature is taper turning where you define a taper angle and just turn the Z handwheel, the X axis moves automatically to give you the taper you want. Same for radius.

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General Mach Discussion / Re: Orac Lives

« on: September 18, 2009, 03:18:55 AM »

Another Orac here, just completed. Machine had been gathering dust in a local school for over 20 years (unused). I fitted CNC4PC  C11G and C10 breakout boards. (2nd board needed for the handwheel encoders).  Gecko 201 drives and Mitsubishi inverter for the spindle. Handwheel encoders,contactors and relays recycled from scrapped full size CNC router. All running well.