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Messages - joeaverage

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1821
Hi,

https://www.homanndesigns.com/index.php?main_page=product_info&cPath=54_22&products_id=59&zenid=ta53k5otpu0jfchi1m5fc52vc1

Peter Homann has been making these for years and well and truy predates the CNCRoom boards.

Craig

1822
Hi,
the MB3 has a good reputation. It has a good balance of inputs and outputs with both single ended and differential
configurations.

My only concern is that you are then locked into that manufacturers interpretation of a 'good balance'.

I use MB2's from Homan Designs in Australia. The model code is that close to CNCRoom's MB03 to cause confusion but
I believe Peter Homan was first in by many years with the model designation. The MB2 is a bi-directional one port BoB.
It does not have any opto-isolated inputs, relay outputs or a PWM to analogue circuit.  What that means is that the
flexibility is mine, I make and add the additional circuitry as I require. This suits me as electronics is my thing.
If electronics is not your forte then the MB03 is a good alternative.

Craig

1823
Hi,
peak of summer here and we take a dim view of fireworks at this time of year for fear of fire, doesn't stop
some people.

Craig

1824
Hi,
what the hell, I had mine shipped from the US to New Zealand, that's about as far apart as you can get on a sphereical
planet....and it got here no problems. Italy is a reasonably well known address....if you order one you'll probably get it!
Tax?....blame your government!!

Craig

1825
Hi,
XHC has a long reputation as being buggy, both their controllers and their pendants, and you can forget trying to get
XHC to help. They've already got your money and they just don't care.

I use a VistaCNC P1A pendant and have done for years. It worked perfectly with Mach3 and then with Mach4 for the last five
years, and they support their products.

Craig

1826
General Mach Discussion / Re: Altivar 320 VFD + ESS Smoothstepper + Mach4
« on: December 31, 2019, 12:40:15 PM »
Hi,

Quote
First impression is that this VFD is highly programmable/customisable and quite complex ... not something to jump in not knowing what to do.

All modern VFDs are like that.

Craig

1827
Hi.

Quote
sometimes while jogging with the pendant the mach3 software get stuck and the axis I am moving continues to move even if I stop turning the wheel!

If you spin the wheel fast enough the machine can't keep up so the pulses get stored up, so even when the wheel stops the
pulses in the buffer cause the machine to move until the buffer is emptied. This is normal behavior. You need to either not
spin the wheel so fast OR decrease the step size so that the machine never lags behind OR increase the speed of the machine
so that it never lags behind and therefore no pulses get pushed into the buffer.

My solution was the second option, namely reduce the step size. I had originally set the maximum movement per click at 1mm.
I had the problem you describe, that is the machine would carry on moving even after I stopped. I reduced that down to
0.5mm per click. Now I can still make it happen if I spin the wheel really really fast, but you have to be pretty determined
to do it. Mostly I can turn the wheel and the machine keeps pace at a good and comfortable speed without overrun. Problem solved.

Craig

1828
Hi,
what motion controller do you have?

I use an ESS and that means that I can have the second port as inputs so I can have one input per switch, 3 homes and
6 limits and still have inputs left over for probes, Estops etc.

If you are using a UC300 an ESS or a 57CNC then you have plenty of inputs, there is no need to be stingy with them.

If you have separate homes and limits Mach is never confused about which event has occurred. If for instance you haxe the X home and X- limit
combined on one input then when you are referencing your machine you wish Mach to interpret a signal on that input as a home switch. Thereafter
it is to be treated as a limit and cause an immediate Estop. Mach can and does treat them differently but if it gets confused can you blame it?
Whereas if you have separate switches if ANY of the limits operates causes an immediate Estop at all times and conditions likewise the
home switch always gets treated as a home event, never any other interpretation required.

Craig

1829
Hi,
I use roller plunger snap action microswitches as home switches. They are set up several mm 'inside' the machine boundaries.
They are operated by a little ramp screwed to the axis bed. This means that should the axis overrun the switch is not damaged.

I would suggest roller plunger switches a little inboard of machine limits. I would use prox sensors as limit switches.
I know most people try to combine limit and home switches into just one switch but then have exactly the problem you describe.
I prefer one roller plunger home switch per axis and two prox sensors at the limits per axis.

Craig

1830
Hi,
when a limit switch triggers Mach does an Estop and it commands the machine stop at what amounts to infinite acceleration,
and NO servos can do that, as infinite acceleration requires infinite current. Therefore your servos fault.

The simple expedient is never to let your machine trigger the limits. In industrial practice it is considered a failure if a
machine 'limits' out. It should have been stopped by soft limits prior to the physical limits being triggered. When a machine
Estops due to a limit event the machine must be re-referenced, time consuming and therefore expensive in a production
environment.

You should do similar, set up your soft limits and set them 2-3mm 'inside' your physical limits and then you'll never touch
the limits. Note this absolutely requires that you reference (home) your machine at the beginning of each Mach session.

A second alternative is to set the limits a little inboard of the bumpers and have a script to decelerate and stop, ie
<FeedHold> and <Stop>, any axis that triggers its 'limit' but WITHOUT causing an Estop.

Craig

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