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Messages - magicniner

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61
General Mach Discussion / Re: Help with machined parts wrong size
« on: January 09, 2016, 07:38:32 AM »
Given it's not the things you say it can't be Russ is right, it looks mechanical

 - Nick

62
I've voted for the by the minute charge in 5 minute increments, whilst subscription is great for organisations needing regular help the reason most companies sell subscriptions seems to be to maintain a revenue stream from their customers.

Jimmy,
Most of the queries which get left unanswered are ones where little or none of the information required to begin to understand their setup is given, if you post a question and furnish as much information about your system as you can I'm sure you'll find someone will respond in kind by making an effort and responding.

63
General Mach Discussion / 3.3v To 5v Bi-Directional Converters
« on: January 03, 2016, 03:25:41 PM »
Has anyone tried the SparkFun bi-directional logic level converter to deal with differences between PP & BOB logic levels?
https://www.sparkfun.com/products/12009
It looks like a few of these in a fairly simple package might deal with the woes associated with modern PPs
I've ordered a pack of 10 to play with,

 - Nick

64
General Mach Discussion / Re: Why parallel port and not USB?
« on: January 02, 2016, 06:20:09 PM »
I'm running fully updated Windows 7 without problems, provided your PC supports the control output device of your choice there's no need to pick older hardware than necessary. I don't have the PC on the network whilst running Mach3, just for data transfer and maintenance.
 
 - Nick

65
General Mach Discussion / Re: Why parallel port and not USB?
« on: January 02, 2016, 05:23:56 AM »
Why doesnt Mach3 support usb instead of parallel port?  

To use a USB device you first need a device with enough independently addressable inputs and outputs, this is what Art Fennerty's parallel port driver achieves through a parallel port, then the manufacturer of that device will have to develop and support (at least until it's fairly mature) a plugin for Mach3.

Even if you had a USB device with a parallel port on the end it's driver would have to support individual pin addressing and you'd still need a plugin to allow Mach3 to run a piece of non-standard hardware.

We currently have all the USB devices for which manufacturers have been bothered to develop plugins, so you see, it's hardware manufacturers that are behind the time and not Mach3.

There are still suitable cards available but you do need to ensure that the data voltage for your BOB and card are compatible (you could do this with your own buffering hardware if you did a little research and built a board;-) ), I haven't contacted StarTech to check the logic voltage for this - http://www.startech.com/uk/Cards-Adapters/Parallel/1-Port-PCI-Express-Base-Parallel-ExpressCard~EC1PECPS - but it is IEE1284 and specifically NOT USB so if it's compatible with your BOB it may provide a way forward.

Failing that there are still a lot of cheap, ex-corporate desktop PCs which are up to the job and likely to give many more years of service.
Until last year I was using a pair of HP Compaq d530 PCs which had run for over 5 years, after the live machine became problematic I swapped out for the spare and investigated alternatives, now I'm using a pair of HP Compaq dc7100s (£40 each - delivered) for CNC and am working on options for their replacement/retirement.

Tweakie has offered a solution which allows you to avoid "Obsolete Technology" but there are thousands of CNC machines out there happily running on "Obsolete Technology" so if it's Function and not Fashion you're interested in then it's still a perfectly viable setup :D

Regards,
Nick

66
General Mach Discussion / Re: squaring slaved axis without limit switch
« on: December 30, 2015, 02:18:41 PM »
It sounds like mechanical oscillation

67
General Mach Discussion / Re: Has to be a record (way too funny)
« on: December 29, 2015, 05:00:52 PM »
Given the number of Mach3 installations giving good stable service I can't understand why so many muppets insist on assuming that it can't be their config or hardware based on a knowledge level of approximately zero  ???  ???

68
General Mach Discussion / Re: squaring slaved axis without limit switch
« on: December 29, 2015, 04:37:39 PM »
What is the construction of the machine and is it square with all drive removed?
If drive tension is required to pull the machine into square the issue could be mechanical bind which will tend to alternate from side to side.

69
General Mach Discussion / Re: Holes resulting with ovality
« on: December 29, 2015, 04:17:34 PM »
That looks exactly like the problem I had which turned out to be backlash, have you checked X for backlash with a DTI?

70
General Mach Discussion / Re: limit swith vibration
« on: December 27, 2015, 05:44:44 AM »
Switches that are used to establish a 0 position must open with a very small amount of travel

I always believed that the repeatability of the switching point was the important bit and not the travel but I'm always keen to learn, can only short travel switches provide repeatability? 

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