Messages

91

General Mach Discussion / Re: Displaying Loop Number

« on: April 20, 2015, 04:42:40 AM »

Well I have had a look on the Wiki and couple of other places and I can't see any DRO that will display the loop number. Any one have any idea's?

92

General Mach Discussion / Re: Machine Missing Steps? Direction on Corners

« on: April 19, 2015, 05:49:30 PM »

The resolution I have setup is to set the step and dir to 1uS (down from 3uS) and this seems to have resolved the issue. Why? I don't know. I am still getting tool walk on cutting shapes with multiple cuts in z axis, however I think this is related to backlash, and resolution of stepping being set to full steps. I have  0.0083mm (0.000328")resolution and the the backlash is between 0.001" and 0.0013" , this however leaves me with a mismatch on compensation(division of resolution into backlash) and I believe this accumulates in multiple cuts around the periphery of a square for example. I also have discovered I may have a little play in the tool head and I will being trying to eliminate this today if it is the case. I will also try half steps to see if this will bring the accumulation error down further. And I will have a look at resonance issues BR549.

93

General Mach Discussion / Re: Displaying Loop Number

« on: April 19, 2015, 05:31:11 PM »

Thanks , I'll see if I can find it.

94

General Mach Discussion / Re: Machine Missing Steps? Direction on Corners

« on: April 18, 2015, 11:40:35 PM »

Hi BR549,
As it occurs at the corner this is where the backlash switches in after a 90 degree prior turn and the shuttle setting affects this point e.g. Cutting a square or rectangle etc etc. No micro stepping, only using full steps, and if the speed was an issue I would expect it at a high speed as opposed to a lower speed.

95

General Mach Discussion / Displaying Loop Number

« on: April 18, 2015, 09:16:21 PM »

Hi guys,
Just a simple query, is it possible to display to loop number as you work?
The reason I ask is I sometimes do work that en-tales loops upto 25 times and it would be good to know how far along the program is.

96

General Mach Discussion / Re: Machine Missing Steps? Direction on Corners

« on: April 18, 2015, 05:30:17 PM »

Hi TP, I have sent the accel. Up and down however as I change it I find I have to alter the shuttle numbers and if it's to low it appears worse.
Could you explain the dampners idea? Or should I just use google?

97

General Mach Discussion / Machine Missing Steps? Direction on Corners

« on: April 18, 2015, 12:55:34 AM »

Hi guys
This ones been bugging me for ages. My Machine, a mill conversion, is going backwards occasionally at corners. Only for a step or two and on the odd occasion like a wild untamed thing.
I have been experimenting with cv, and shuttle numbers with good results, and last night after thinking i had it, it burst onto the scene again.
Details
A HobbyPro CNC kit.
3 to 1 ratio on the drives to driven.
ball screws with oil groves milled on all surfaces
(I don't believe it is an issue with power/torque)
At high speeds(above 200 mm/min) it doesn't seem to worry it. Max is 700mm/Min
low speeds 50-100 really make it appear.
last night I altered the step pulse to 1uS from 3uS and it appears to have corrected it!

if i change the feed rate it appears to fix it or make it worse depending on where I change the Shuttle numbers or step Pulse width too.
Any ideas on removing this bug in my system would be greatly appreciated.
I have access to a CRO if anyone can suggest where to look if it may be a noise issue
This is my Profile File below if you want to check it.

Also if any one knows, how can you get the job path to reflect the actual directions of the machine. Mines about face.

98

General Mach Discussion / Re: Move Z Axis without reWritting the whole code again

« on: February 17, 2015, 05:55:07 PM »

http://www.machsupport.com/forum/index.php/topic,28272.0.html
Ok used this code (and Thank you to the owner)
what do you all think?

G0 G49 G40  G17 G80 G50 G90
(Drill 12mm Holes x 3)
G1 X0 Y0 F500
G1 X-59 Y-3.67
M06
G1 X-59 Y81.2
M06
G1 X4.2 Y58.9
M06

g41 p3

#10=[0]           (Parameter #10 starting value; will be used for stepping the Z axis in .2 increments)


M98 p1000 L30     (GoTo subroutine with label 1000, repeat routine L? times :-Divid Increments into total Move; The letter p precedes the 1000)

g40
G0X0Y0
M30 ( Stop and Reset)                        (Program end)       

(subroutine for Z Axis)

o1000           (Label 1000, indicated with a letter o, not number 0)
         
#10=[#10+.2]    (Increment parameter #10 by .2)
G1 Z#10 F50     (Z is now incremented by .2 because #10 has been increased after cutting action)
     

G1 X0 Y0 F500
G1 X-49.8 Y0
G1 X-49.8 Y-8
G2 X-68.45 Y-7.3732 I-11 J5.1681 F250
(The X center point is -9.0858 Y center point is 5.1681 )
G3 X-66.2352 Y-2.6517 I-4.7874 J4.7264
(The X center point is -4.7874 Y center point is 4.7264 )
G1 X-66.2352 Y-2.6517 F500
G1 X-66.2352 Y71.4879
G3 X-71.4879 Y79.33 I-6 J1.4 F250
(The X center point is -6.4323 Y center point is 1.4812 )
G2 X-48.5 Y86.2677 I12.1951 J1.5675
(The X center point is 12.1951 Y center point is 1.5675 )
G1 X-48.5 Y86.2677 F500
G1 X-48.5 Y73.5993
G1 X-4.3 Y58.9443
G1 X-4.3 Y63.6
(G2 X8.932 Y47.8448 I8.9608 J-4.885)
G2 X8.932 Y49.5 I8.9608 J-4.885 F250
(The X center point is 8.9608 Y center point is -4.885 )
G1 X8.932 Y49.5 F500
G1 X-0 Y49.5
G1 X-0 Y-0
M99

99

General Mach Discussion / Move Z Axis without reWritting the whole code again

« on: February 17, 2015, 05:02:09 PM »

Ok, before we start.... i seem to be having a brain fart.(been away from the machine working for 18Months).
The below code has to have the z axis increment as I machine through a piece of Aluminium
I have chased through my notes from over 8 years and for love nor money i cant remember how to add to the Z axis after each complete cycle.

Also if any one could advise, i am losing a couple of steps in random places while doing the radius cuts, any thoughts?

G0 G49 G40  G17 G80 G50 G90
(Drill 12mm Holes x 3)
G1 X0 Y0 F500
G1 X-59 Y-3.67
M06
G1 X-59 Y81.2
M06
G1 X4.2 Y58.9
M06
(I need to Loop from Here to increment the z axis for multiple cuts)
g41 p2
G1 X0 Y0 F250
G1 X-49.8 Y0
G1 X-49.8 Y-8
G2 X-68.45 Y-7.3732 I-11 J5.1681 F250
(The X center point is -9.0858 Y center point is 5.1681 )
G3 X-66.2352 Y-2.6517 I-4.7874 J4.7264
(The X center point is -4.7874 Y center point is 4.7264 )
G1 X-66.2352 Y-2.6517 F250
G1 X-66.2352 Y71.4879
G3 X-71.4879 Y79.33 I-6 J1.4 F250
(The X center point is -6.4323 Y center point is 1.4812 )
G2 X-48.5 Y86.2677 I12.1951 J1.5675
(The X center point is 12.1951 Y center point is 1.5675 )
G1 X-48.5 Y86.2677 F250
G1 X-48.5 Y73.5993
G1 X-4.3 Y58.9443
G1 X-4.3 Y63.6
(G2 X8.932 Y47.8448 I8.9608 J-4.885)
G2 X8.932 Y49.5 I8.9608 J-4.885 F250
(The X center point is 8.9608 Y center point is -4.885 )
G1 X8.932 Y49.5 F250
G1 X-0 Y49.5
G1 X-0 Y-0
g40
G0X0Y0
M30 ( Stop and Reset)

Any Help would be greatly appreciated as wife reckons im losing it

100

General Mach Discussion / How to work out auger flights

« on: August 11, 2013, 07:47:02 PM »

Hi guys, trying to find a formula on how to generate flights for screw augers so I can cut them out and not having any luck.
Does anybody now if there is a formula? And we're I can get my hands on it. I have been looking for months and nothing, currently I am using cut and try from .8mm sheet until I get it close and have found that the distance traveled along the screw to do 1 complete turn is close to the diameter to cut the inside radius, am I on the right track?
Hope some one can help, don't need Mach code just the formula, I can do the rest.