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Messages - magicniner

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71
General Mach Discussion / Re: help need to create mirrored a component
« on: December 26, 2015, 09:09:10 AM »
I've used -1 scale to mirror parts and it just works, you can mirror any job yourself if you need to see what it looks like.

 - Nick

72
General Mach Discussion / Re: Holes resulting with ovality
« on: December 26, 2015, 07:00:04 AM »
Hi Guys, I been experiencing some problems lately with "deformed" cutting paths and have replaced one of the encoders


It's more likely to be your calibration than speed, what happens if you drill a square pattern of holes?
With the mention of encoders along with no other machine information you've lost me.
If you've posted full machine details somewhere else a link or pasted text would save folk from going hunting for it in order to read up in an effort to help,
Regards,
Nick

73
General Mach Discussion / Re: Help with machined parts wrong size
« on: December 26, 2015, 06:49:19 AM »
If by reversing the cut the part comes out undersized. What would that imply?


A rotating cutter when engaged in a material and moving in a given direction will be subject to a force generated by the rotational movement of the cutter which can generate sideways take-up of any slack or flex in the system.

Test your outer profile cut with clockwise and anti-clockwise paths to see if there's a size difference and how much.

 - Nick

74
General Mach Discussion / Re: Help with machined parts wrong size
« on: December 24, 2015, 06:25:38 AM »
Did your outside profile have a finishing cut? If not try it with one of the size of your error, you could also try reversing the direction of your profile cut to see if it reverses the error to undersize, 

 - Nick

75
General Mach Discussion / Re: Help with machined parts wrong size
« on: December 23, 2015, 08:39:48 PM »
Were inside and outside cut with the same strategy, both with the same depths of cut, finishing cut and both climb or conventional?
If your machine has significant flex in it changing almost any parameter can change the path slightly,

 - Nick

76
When I adjust the X axis position (left right keys) it moves left and right just barely but almost seems locked.


If the axis movement distance shown in the DRO doesn't match the physical movement then you need to adjust your motor tuning steps per unit movement to correct this

I don't know how to determine if the parallel port is a addon or if it is factory/to the mother board (read this could be an issue)


That's not really relevant, it's an age and manufacturer thing, both on board and aftermarket PPs can be 3v or 5v, if you know your CNC system needs a 5v signal and you adjust your motor tuning and still can't get repeatable movement you may have to investigate the port signal voltage

 - Nick

77
General Mach Discussion / Re: Converting from ncstudio
« on: November 15, 2015, 07:15:15 AM »
This guy appears to be doing just what you're trying to do,

https://www.youtube.com/watch?v=aW0E-0B5SB4

I haven't watched the whole video for you though, that's your job ;-)

You might find a quick Google search on

convert nc studio to mach3

will yield lots of useful information too,

 - Nick

78
General Mach Discussion / Re: Lathe Threading Troubles
« on: November 06, 2015, 04:38:56 AM »

One other thing that I tried on another scrap piece was turning a thread at different speeds, I turned a thread at 300rpm then left it in the chuck and returned it at 200 rpm then 400rpm, what I noticed all three turned the thread properly but the start point was not in the same position on each of them, the slower turn started the thread earlier on the same piece and the faster later, no doubts the thread was ruined but interesting test non the less.


No surprise once you consider that you are using a feedback loop with a single position sensor and consistent signal timings, it is logical that start points will vary and will get later for faster rpm, it also explains why constant speed is critical to avoid pitch variations.

 - Nick

79
General Mach Discussion / Re: Confused about work offsets
« on: October 28, 2015, 10:56:09 AM »
I am using BobCad CAM to generate most of my code, and the post processor typically adds a G54 command to all programs.

BobCAD-Cam usually adds the offset to each feature, if you compile multiple features you should search through the code for instances of offset commands and delete them when running manually and without correspondingly configured offsets in Mach3

80
General Mach Discussion / Re: Confused about work offsets
« on: October 28, 2015, 05:16:00 AM »
Don't replace G54 with something else, just remove it, also do a search of your code in Note Pad or an editor, G54 will often be at the start of multiple features throughout the code.
You can use the same switch for Home and Limit but you can also have separate switches, why not add home switches wired back to Mach3 which throw just before your limits with enough over travel to allow the limits to actuate, then you can use Ref All Home and start down the path to using Machine Offsets to put a zero on your table with Work Offsets and Tool Offsets to drop it on the job ;-)

 - Nick


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