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Messages - Tweakie.CNC

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4761
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/

Tweakie.

4762
Mach4 General Discussion / Re: Mach4 Printer Port Discussions
« on: June 08, 2014, 08:11:59 AM »
Hi Art,

That old plugin is going to take some bettering you know  ;D

Incidentally, because the Digital Trigger only has a maximum duty cycle of 50% I am now experimenting with using an external processor to measure the PRF (dependant on Feed-Rate) and adjust the pulse width to increase the duty cycle to 95% (adjustable). This has enabled the plugin's use with diode lasers down to 150mW output power allbeit extremely slow feed-rate and my 40Watt tube to really attack Corian at 4500 mm/min.  ;D

I look forward to following your progress in the new thread once you get everything up and running.  ;)

Tweakie.

4763
Mach4 General Discussion / Re: Mach4 Printer Port Discussions
« on: June 08, 2014, 01:02:24 AM »
Wow! - Thanks Art, now I know what I will be doing this afternoon  ;D

Tweakie.

4764
Show"N"Tell ( Your Machines) / Re: DC-K40 Laser conversion issue
« on: June 06, 2014, 01:34:41 AM »
Hi Jeff,

If you want to use the Z axis then it's the Z Axis direction pin# (Config. / Ports & Pins / Motor Outputs). GND is connected to the breakout board GND.

(please be aware that all the axis direction pins retain state (hi / low) until that particular axis is moved in the opposite direction).

Tweakie.

4765
General Mach Discussion / Re: Z Axis problem
« on: June 04, 2014, 01:47:37 AM »
Hi Bob,

I am pleased to hear that you have resolved the problem  ;)

Tweakie.

4766
General Mach Discussion / Re: Turning center/milling online
« on: June 02, 2014, 12:22:31 PM »
I am sure you could use Mach3 - Hood is the man who can explain just how much work would be involved.

Tweakie.

4767
General Mach Discussion / Re: Step jog wierdness.
« on: June 02, 2014, 12:04:25 PM »
Hi Dickeybird

Can't say that I have ever encountered the problem you are experiencing so can offer no advice.

If it's any help, I use v.056 with my Mill / CNC and this seems to perform the best for me.

Tweakie.

4768
General Mach Discussion / Re: T-D 3 axis contoller
« on: June 02, 2014, 05:49:15 AM »
Hi Martin,

Yes the pictures help.

I am not a fan of the YOOCNC stuff and this board (PW3024) has caused others problems in the past - not that it is much help but my view is that this board is junk.

You really need to be into electronics (or know someone who is) in order to fault find and solve the problem as there are a number of components that need to be checked. In particular the IFR630, resistors R3 & R4, EL817 and its series 100 ohm resistor (plus other associated components of course).

If it's any help to you, this is the board's component layout and circuit diagram.

Tweakie.

4769
General Mach Discussion / Re: T-D 3 axis contoller
« on: June 02, 2014, 03:31:49 AM »
Hi Martin,

Welcome to the forum.

Looking at your website, you have certainly made some extremely beautiful pieces - my congratulations sir.

Could you perhaps post a picture of your controller board so it can be identified as I suspect that some damage (other than the fuse) has been done to the spindle control circuitry. I may be an easy fix and if we can help you we would be pleased to do so.

Tweakie.

4770
Mach4 General Discussion / Re: Mach4 Printer Port Discussions
« on: June 01, 2014, 02:49:50 PM »
Hi Art,

Wow, that motion is fantastic – I’d love to have that on my CNC (perhaps one day).

My view is that the motion would not cause any damage to a glass CO2 tube (the water coolant mass is really not that great) but…

There are serious problems with mounting single CO2 laser tubes (metal or glass) vertically – basically there is debris produced as a result of the RF or plasma arcs, this debris settles (under gravity) onto the ‘output coupler’ which burns in and results in early failure of this component. For example, Synrad withdraw their warranty on tubes mounted beyond a specified degrees from the horizontal. Having said that, the ‘double’ glass tubes which only have 100% reflecting mirrors at the lower end (outside the plasma envelope) are often mounted vertically in medical equipment. Obviously their tubes are changed very frequently but I think it indicates that there are ways around the problem.

I think you would have to go a long way to better the performance of the Mach3 Impact / Laser Engraving plugin (which you wrote way back when) but I look forward to hearing more of your progress.

Keep up the good work my friend. ;)

Tweakie.

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