Messages

4391

Mach4 General Discussion / Re: Repeating Problems with Y Axis Stepper

« on: June 03, 2018, 04:43:51 PM »

Hi,
you say the X and Y axis motors are the same, but are the axes?. Is the Y axis heavier for instance?.

A heavier axis will require more torque to accelerate it.  If you can eliminate other potential causes like power supplies, driver settings,
control settings the you may need to increase the size of the motor.

What motors are you using?
What voltage power supply are you using?
What drivers are you using?
What microstepping regime are you using?

Craig

4392

Mach4 General Discussion / Re: Homing & Limit Switches

« on: June 03, 2018, 04:35:31 PM »

Hi,
if you had a second BoB you'd have plenty of inputs.

You get the regular five inputs with the first BoB and another 13 with the second. As I say there is a question mark as to whether the C11 can re-purpose
its pins 2-9 as inputs, but if the C11 cant there are others that can. One additional BoB (that can re-purpose its inputs) is cheaper than the MB2 but the MB2
also represents a good solution.

Craig

4393

General Mach Discussion / Re: Really basic "beginner advice" needed please !!!

« on: June 03, 2018, 09:52:08 AM »

Hi Stanley,
as Dave points out  500GBP is probably pretty good value, if it works. You will no doubt have read that many have faced exactly the same problem you are.
In many case they resolve the issues and get it to work.

Question: Would you still consider 500 reasonable if you retained the mechanical parts, maybe the power supply, the spindle and speed control but
bought a new (US or European) motion control board?

Craig

4394

Mach4 General Discussion / Re: Homing & Limit Switches

« on: June 03, 2018, 02:35:05 AM »

Hi,
I've just been reading the C11 manual and it is not plain to me that it can be configured with pins 2-9 as inputs.

The original specification for the parallel port allowed pins 2-9 as outputs or alternately as inputs. You couldn't have some of each, they were either all inputs
or all outputs. Neither was it possible to re-define the data direction on the fly.

With Mach3s use of the parallel port it was the norm for pins 2-9 be outputs that could be used for step/direction outputs. If you used a second parallel port pins 2-9
are usually assigned as inputs as it was inputs that were seriously lacking when you only had one port. The second BoB then required circuitry that would treat pins 2-9 as
inputs. Not all BoBs did this or are capable of it.

I use Homan Designs BoBs from Austrailia, near enough to local for me. The BoB can be configured with pins 2-9 as either input or outputs for maximum flexibility.
This is made possible by the bi-directional tri-state buffer IC used by Homan designs.

A quick read of the C11 manual suggests this may not be possible with the C11. Before you rush off and buy another you may need to do some research, even confirming
with the supplier before parting with your money.

I have looked at the documentation of the MB2 from CNCRoom that I linked to previously. In table 1 page 4 of the manual shows the pin arrangements.
Pins 2-9 port1 are line driver outputs, ideal for driving higspeed step/direction pulses.
Pins 3-9 port2 are NPN inputs suitable for extra inputs such as limit and home switches.
Pin 2 port2 is a sink output rather quirkily
Pins 2-9 port3 are sink outputs.

Thus there are certainly sufficient inputs for your purposes but the manufacturer has made some design choices that might restrict your flexibility compared to having three separate
BoBs like the Homan Designs units.

Craig

4395

Mach4 General Discussion / Re: Homing & Limit Switches

« on: June 03, 2018, 01:06:18 AM »

Hi,
amongst ESS owners this BoB from CNCRoom has become popular:

http://www.cncroom.com/break-out-board/smooth-stepper

All three ports are utilized. I don't have one but the reports of those that do are enthusiastic. Note how the ESS sits
atop the BoB, very convenient.

Caig

4396

Mach4 General Discussion / Re: Homing & Limit Switches

« on: June 03, 2018, 12:55:17 AM »

Hi,
yes. The ESS communicates with all three of its ports simultaneously.

Really the arrangement of the ESS's IO into three 'look-a-like parallel ports' is redundant. The core of the ESS, the FPGA chip controls ALL of the pins
and they could be arranged sequentially  1 through 50 say. This is how PoKeys name the IO pins of their 57CNC for example.

The ESS and the company that makes it, Warp9, started making control devices for the Mach3 market. As then users of Mach3 were intimately familiar with the
naming and numbering on the pins within the parallel port Warp9 decided to continue the naming/numbering scheme so that it  appeared seemless to their customers.

To take advantage of the extra IO would require you get a second BoB but they are usually pretty cheap and all the extra inputs and outputs is a luxury. You can plan,
design and build additional bits of gear without spilling over into the control space of existing gear.

You may have noticed that Mach4 provides four probe commands, G31.1 G31.2, G31.3 etc and they are supported by the ESS. You might have a probe mounted in your spindle
to measure the 'flatness' or otherwise of the material and another separate switch to set tool length offsets. Having multiple individual probe inputs allow you to do this
without an erroneous input on the unused probe interfering with the active probe. Very handy. We used to be able to do this only by combining the two probes to just
one input pin and getting wrong results  because of noise on the unused probe is not trivial. It does of course require that you have spare input pins available. The ESS
and others makes it easy.

Craig

4397

Mach4 General Discussion / Re: Homing & Limit Switches

« on: June 03, 2018, 12:14:01 AM »

Hi,
I've found a wrinkle that offers some flexibility if you are using modern AC servos.

I have a second hand Allen Bradley servo and drive for a spindle motor and found amongst all the other features that you can hook the limit switches direct to the drive
not the controller/BoB at all. I have since noticed that this idea is common among other manufacturers also, certainly Granite Devices, Delta, Sneider, Panasonic and Yaskawa.

The idea is that with the limit switches each hooked to their own pin on their own drive that 1) it protects the axis against out-of-bounds excursions, 2) provides a logic lockout
to the axis jog direction that would make the excursion worse , 3) signal the controller that a fault has occurred and 4) whether that fault condition is combined with others
like 'following error' or not is subject to your control having programmable digital outputs on your drive.

I believe that this idea started with the concept of 'distributed motion control' where each axis driver controls its own motion only and therefore has need of direct access
to both its home and limit switches. The combined motion occurs when the controller synchronises the individual axis movements. Ether-Cat is a prominent example of this idea.

Craig

4398

Mach4 General Discussion / Re: Homing & Limit Switches

« on: June 02, 2018, 11:46:17 PM »

Hi,
NKS is right, you can combine switches to reduce the number of inputs required, usually with a modest loss of functionality.

The ESS has three ports. With a second or even third BoB you can have multiple inputs. You may have noted in the ESS setup screens the option of declaring pins 2-9
in ports 2&3 as inputs rather than their default as outputs. This means that the two ports provide 26 inputs and 10 outputs.

I have two BoBs attached to my ESS to gain the extra inputs, its easy to do and such a luxury. Combining limit and home switches as NKS proposes is apt to confuse you
if not Mach and the first time you recognize a fault in your logic or perhaps a hardware fault like noise or a broken wire is when the carriage sails off the end breaking stuff as it goes.

Craig

4399

General Mach Discussion / Re: SXCNC 6040 mach 3 setup (JP-3163B v.3.9) (Need help!!)

« on: June 02, 2018, 01:58:33 AM »

Hi,
you are going to have to get information about your controller from the supplier.

Do you have a manual for it?

Craig

4400

General Mach Discussion / Re: ABC's of YOOCNC 6040Z Setup

« on: June 01, 2018, 07:24:32 PM »

Hi,
this is a Gcode problem not a Mach3 problem.

To be effectective at CNC you are going to have to become familiar with reading Gcode. There are online tutorials.
Or  'The CNC Handbook' by Peter Smid is sort of the CNC bible.

Craig