Hello Guest it is June 04, 2023, 10:47:59 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Topics - Tweakie.CNC

Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 »
Tangent Corner / 3D Printing a full size Elephant.
« on: March 07, 2015, 02:13:55 AM »
An excellent project (and for a very worthy cause) appeared on KickStarter recently and the details are here https://www.kickstarter.com/projects/1661525705/z-unlimited-add-on-for-ultimaker?ref=discovery


Show"N"Tell ( What you have made with your CNC machine.) / Guitar Strings.
« on: December 28, 2014, 02:56:24 AM »
Despite the high levels of technology that have been incorporated into professionally manufactured, machine wound, strings the demand still exists for the purpose-made string (like there is sound and there is sound there are strings and there are strings – there can be a world of difference to those with a trained ear).

A good friend and Luthier has been making classical Guitars and manually winding his own strings for many years now and together we are investigating CNC machine winding. My involvement is solely with the Mach3 side of things and to this end I have adapted Benny & Brian’s Coilwinder screenset for the purpose.
In order to check my macro code and attempt to resolve some of the mechanical issues I have constructed a small (1/8 length) test rig and thought these pictures may be of some interest to others.

It’s early days yet and it can only get better so stay tuned folks.  ;D


General Mach Discussion / Just a general question…
« on: December 21, 2014, 07:35:57 AM »
Whilst using Mach3 with the Parallel Port - when running a stepper motor at a constant speed of 2000 rpm the pitch of the sound it produces, very occasionally, has a momentary slight change. Increasing the speed to 2500 rpm - this slight change of pitch ‘phenomenon’ generally causes the motor to stall.
Fitting a ‘dampener’ (in the old days, used to overcome ‘mid band resonance’) overcomes the stall and for the most part cures the problem (maybe fitting a suitable ‘flywheel’ may also work just as well).

I suspect that the aforementioned ‘momentary change of pitch’ is a glitch in the step pulse chain which may be Mach3 related or Windows related, I don’t know which, but I am wondering if anyone else has trod this route and has found any answers.

My next task will be to try an external motion controller and see if the ‘phenomenon’ persists but at the present it is all bit of a mystery.


Mach4 General Discussion / Ethernet Smooth Stepper.
« on: December 03, 2014, 03:13:43 AM »
Just a heads-up for those using the Ethernet Smooth Stepper.

The beta version of the ESS Mach4 plugin has now been released http://warp9td.com/index.php/sw

A huge thanks goes out to Greg for all his continuing hard work with this plugin, which is available free of charge, and I sincerely hope that increased sales of the ESS more than pay him for all the time he has dedicated to this product.


Tangent Corner / We all make mistakes.
« on: September 27, 2014, 04:42:36 AM »

It all became pretty obvious once I thought about it but at the time it was something I did not consider.
I was driving a domestic sewing machine with a steel reinforced, T5, synchropower, timing belt. I set the correct belt tension and the driven load was well within the belt manufacturer’s specification. What I, rather stupidly, failed to consider was that the driven mass increases exponentially with acceleration.
At 300 rpm and with an acceleration, from stationary, of 0.6G’s everything was just fine but in the quest for speed I increased the acceleration to 0.8G’s and then the belt started to stretch.
In the interest of science I re-adjusted the belt tension a number of times and it continued to stretch until such time as the teeth pitch failed to match those of the pulleys.
Basically, with this type of belt the steel reinforcement is helically wound during manufacture and there is no real bond between the wire and the polyurethane so what started out at say 11 complete turns of the wire (within the belt) soon became 10.8 complete turns as the polyurethane stretched.

What I have learnt – I choose the wrong type of belt for the intended application.  :'(

Yet more knowledge to file away in my repository.  ;D



Mach4 General Discussion / A Question.
« on: June 27, 2014, 11:41:09 AM »
Will Mach4 provide a square wave PWM output signal (similar to Mach3) or will that be up to the external motion controller to produce. ?



Mach4 General Discussion / Laser Cutting.
« on: June 18, 2014, 10:05:09 AM »
I have said it before but I just can’t say it enough – my congratulations go out to the Mach4 team and of course, Art for the excellent Darwin driver.

Just couldn't resist making a short video of Mach4 (build.1767) with Darwin laser cutting.  http://www.graytel.talktalk.net/Mach4.wmv



This is the video of the latest test engraving and cutting  http://www.graytel.talktalk.net/Darwin 2.wmv

General Mach Discussion / Engraving Spindle.
« on: June 13, 2014, 05:01:01 AM »
Just as a heads up…

Tests have shown that small brushless dc motors (BLDC), more usually used with RC models, (mainly because of their high power to weight / size ratio) can make ideal engraving spindles.
The construction of just one such spindle is detailed here; http://openbuilds.com/builds/890kv-ox-rc-spindle.411/
To facilitate BLDC motor speed control and operation from Mach3 I have now made a simple interface circuit which takes the Mach3 generated PWM signal and converts it to the necessary pulse stream for operation the motor’s ESC and this is detailed here; http://openbuilds.com/builds/software-speed-control-of-a-brushless-dc-bldc-motor-from-mach3.762/


Pages: « 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 »