Messages

1431

General Mach Discussion / Re: plasma anti dive

« on: October 13, 2010, 08:17:15 AM »

Hi Terry

I first came accross it on the screenset from soundlogicus when I got one of their THC300's. The only mention I've been able to find is in the mach2 mill manual on the downloads page section 6.2.13.1.

Not a big deal really - just wondered how to use it to see if it had any benefitial effect.

Ian

1432

General Mach Discussion / Re: plasma anti dive

« on: October 09, 2010, 11:47:24 AM »

I thought anti dive was to keep Mach from diving into a hole or span cause by the rise in arc voltage as it crosses the gap.

Could be wrong but that is how it seems to work here.  Otherwise IF you had a long dwell on start the head would try to dive into the hole to chase the arc voltage. Same if you crossed a span or gap in the metal

Just a thought, (;-) TP

What you describe is an anti-dive feature of SOME THCs - generally the more sophisticated ones. When the arc crosses a gap, the electronics "recognize" the voltage spike and suspend THC until the voltage settles again. BUT - what I'm referring to is the more simplistic anti-dive that comes out of the box with Mach - i.e. a software thing rather than hardware. The problem it's meant to prevent is that when you slow down round (say) a sharp corner, this causes the torch volts to rise. This fools the THC into thinking the torch to work distance has increased so the THC sends torch DOWN to Mach. Ouch - Crash.

So to get round this you can set an anti dive speed in Mach (OEM 82) which basically says if you go slower than this then ignore the UP/DOWN signals from the THC. It's enabled/disabled  with OEM 221 or with OEM 222,223.

Unfortunately it doesn't seem to work! Hence my question.

1433

General Mach Discussion / plasma anti dive

« on: October 09, 2010, 06:47:59 AM »

anyone got this to work? According to the manual if actual feedrate drops below whatever anti-dive is set to then torch up/down input signals should be ignored by Mach but this doesn't seem to happen.

1434

General Mach Discussion / Re: problem xyza drive fast ?

« on: September 19, 2010, 05:18:48 AM »

Found out a little that may help Hood. Seems there's a couple of versions of the tb6560 driver but anyway the plain vanilla one which I think this is has full, 1/2, 1/4 and 1/16th microstepping.
From the piccys on ebay I'm pretty sure the steppers are direct drive. (helical couplers mind - oops)
Certainly I'm thinking this makes kocher's 2000 steps per unlikely.

Ian

1435

General Mach Discussion / Re: G31 does nothing, in probing wizard and MDI...HELP

« on: September 19, 2010, 04:20:02 AM »

A straight G31 Z1 (or whatever) should give you DRO movement regardless of whether you even have a probe fitted so something is definitely not right. I just installed the latest lockdown and it works fine here. That said I'm using the PP driver and your using SS so hopefully someone who also uses the SS and latest lockdown will chime in. BUT I would have thought that you'd get DRO movement even if you didn't have ANY driver fitted so I'm a tad stumped on this one.

Ian

EDIT: Have you got your signal activation logic the right way round? If your probe is already active when you command a g31 then it will be ignored. If that is the case mind you should get a "Probe ignore, Activated at call for probe" message in the status line.

1436

General Mach Discussion / Re: Scriptor Compile Error?

« on: September 19, 2010, 03:48:38 AM »

just took a look at the out-of-the-box macro and it looks like this on my system

rpm = GetRPM() SetSpinSpeed( rpm )  

whereas syntactically it should look like this

rpm = GetRPM()
SetSpinSpeed( rpm )

Ian

1437

General Mach Discussion / Re: How to recover from power interuption?

« on: September 19, 2010, 03:45:53 AM »

I'll add it onto my list Terry 

1438

General Mach Discussion / Re: How to recover from power interuption?

« on: September 18, 2010, 05:51:04 AM »

I'm guessing I'm off your Birthday invite list then Terry.

Ian

1439

General Mach Discussion / Re: Exactly how are home switches supposed to work?

« on: September 17, 2010, 10:18:54 AM »

I think moving the switch to the left is the right thing to do - that way you can't (likely) end up to the left of it. But - regardless of where the switch is - home is where you want it to be. So if (just for example) you wanted the middle to be zero or whatever, just set home at the left to be minus 10 or whatever.

Ian

1440

General Mach Discussion / Re: Exactly how are home switches supposed to work?

« on: September 17, 2010, 05:16:23 AM »

According to the manual, Section 5.6.1.1, (I actually read the manual  ) I would expect that when a home switch is active, the initial homing motion would be reversed from that specified in the "Home Neg" check box.

It does say that - you're right - the manual implies that if you're already on the switch it will just do the second part of homing i.e. back off the switch and call it home - but unfortunately it would seem the manual is wrong - now that's something you don't see every day 

Ian