Messages

3551

General Mach Discussion / Re: New people welcome !! Come in here and introduce your self!

« on: February 10, 2016, 02:27:28 AM »

Hi Daniel,

Welcome to the forum.

Post your question as a New Topic in the general section, giving as much detail about your machine and it's setup as you think may be necessary for others to understand the problem you are having. A picture of the deformed shapes you mention may also help (use the Reply tab and Additional Options to post images).

Tweakie.

3552

General Mach Discussion / Re: Mini-Mills - any good???

« on: February 09, 2016, 05:45:23 AM »

Both dependant on the overall size of the machine but…
A moving gantry machine can have a much smaller footprint.
A fixed gantry machine can have a lot less mass on the Y axis.

There are many other for’s and against’s for each design so it perhaps all comes down to personal preference. 

Tweakie.

3553

General Mach Discussion / Re: Motor stalling / noise in lines

« on: February 09, 2016, 04:20:05 AM »

I would use twin core braided screen similar to this pic. for all inputs (switches, estop, etc.).

Tweakie.

3554

General Mach Discussion / Re: Motor stalling / noise in lines

« on: February 09, 2016, 02:02:14 AM »

My suggestion would be that you replace all your inputs wiring with shielded (screened) cable with the shield connected to a single point (star) earth at the controller end only. You should then be able to reduce your debounce setting and hopefully not have any more 'ticks' when jogging the motors.  

Tweakie.

3555

General Mach Discussion / Re: china cnc 6040

« on: February 08, 2016, 06:42:35 AM »

Try reducing your Velocity and Acceleration settings in Motor Tuning by 50% for the X and Y axes, save the changes after altering each axis. If this cures the problem then fine tune your motor settings for optimum performance. The Mach3 manual gives more detailed information http://www.machsupport.com/help-learning/product-manuals/

Tweakie.

3556

Show"N"Tell ( Your Machines) / Re: Ballistic ATC

« on: February 07, 2016, 02:47:37 AM »

Nice work Jeff, thanks for sharing the info. and posting the pictures.

Tweakie.

3557

Screen designer tips and tutorials / Re: Where are button scripts saved?

« on: February 07, 2016, 02:43:02 AM »

The button scripts are part of the .set file and should migrate OK.

Tweakie.

3558

General Mach Discussion / Re: Manual control via keypad is missing - help

« on: February 06, 2016, 04:16:08 AM »

Have you accidentally clicked the Jog ON/OFF button ??

Tweakie.

3559

General Mach Discussion / Re: CNC router shudder and jerky / jitter doing 3D toolpaths

« on: February 06, 2016, 02:48:24 AM »

Motor torque diminishes with increased microstepping.

Basically if your drives are set on full step resolution you will get your motors rated torque, however the torque diminishes via the following equation

T actual = Torque Rated x Sine of (90 / microstep setting)

Hence if you are running say 16microsteps.... you get about 9.8% of your motors rated torque...

Hi Rob,

Once, this info was correct but it is now many years out of date and still the myth continues to be perpetuated.

The manufacturer's of the various stepper driver chips (eg. Allegro/Toshiba/etc.) are well aware of the stepper motor characteristics and design their circuitry accordingly. Basically their chips are ‘smart’, using a form of back emf to proportionally increase the current through the energised windings to balance the available torque in relation to a micro-step position and shaft loading.
It’s a few years now since I carried out comparative angular deflection testing between a number of different manufacturer’s chips and I can confirm that the test stepper motor’s rotational shaft deflection, under a controlled load, (which is basically, holding torque) was within a knat’s whisker between whole step positions and micro-step positions.

Tweakie.

3560

Brains Development / Re: DRO feedrate to control solenoid cycles?

« on: February 05, 2016, 05:51:59 AM »

Interesting idea Ian.

I suppose it may be possible to use the X & Y axis Step pulses which could be electronically scaled (divided) and combined with the Direction signals so that pulses would vary with speed and only occur when travelling in one direction. I haven’t thought about the quadrant math’s for the circular paths but how hard can it be ?? 

Tweakie