Messages

2571

General Mach Discussion / Re: Configuring Z access

« on: February 10, 2016, 02:41:41 AM »

OK that's good to know. Now let's get back to the road runner. When I cycle start the Road Runner it appears not to be  cutting properly. When completed there is a small indent about size of a dime.  The display table looks fine and shows it cutting appropriately but my X and Y axis are not moving appropetly  to the Road Runner picture being carved. Thanks appreciate the help John is

The Gcode dimensions of the roadrunner file are in Inches and it sounds as though your machine is set-up in Millimeters.
Try editing the file and adding a G20 at the start of the roadrunner Gcode - this will tell Mach3 that you want the file processed in inches and it will then scale everything up to suit.

The Mach3 manual explains in more detail http://www.machsupport.com/help-learning/product-manuals/

Tweakie.

2572

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.

2573

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.

2574

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.

2575

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.

2576

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.

2577

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.

2578

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.

2579

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.

2580

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.