Messages

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General Mach Discussion / Re: Y AXIS with 2x Ball Screw Alignment

« on: May 02, 2014, 06:25:57 AM »

Well after some thinking about all your suggestions and some messing around I have come up with what seems to be a repeatable +/-.004mm  when homing.
What I did was tighten the belt considerably using both of the belt adjustment pulley's then I loosened off the Taper lock in the Driven pulley to hopefully relieve any unbalanced tension in each side of the belt.

The Y axis of the Gantry has a natural spot where it likes to sit without forcing it in a + or - direction, gently locking up the Taper Lock and checking this a few more times until I was happy with the results.

Gents thank you for sharing your wisdom and helpful suggestions 

Breastfed

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General Mach Discussion / Re: Y AXIS with 2x Ball Screw Alignment

« on: April 30, 2014, 01:57:09 AM »

 I have considered changing all the Ball screws to a 5 or 10mm pitch as there is some wear and tear but thats a later upgrade, I don't know what this Gantry was originally used for but I liked the look of it and the price was cheap so I cant take the credit for the adjustment. I really only wanted a machine to carve out HD Foam and wood for molds used in Casting Aluminium, so for this purpose I should not be worrying about 0.1mm.

I can see that bigger Pulleys & Belts and a better choice for the Pitch would help out with regards to Back Lash,

BTW the actual pitch of the ball screws seems to be 0.600" the shaft Dia is also 0.600" (ISSOKU E01 90 420188-2) are the markings on the Ball Nut and ISSOKU's website and catalog's don't help, perhaps its an old model that's been superseded, and I'm still google'n for this one. Does this numbering suggesting what the actual pitch could be ?

Breastfed

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General Mach Discussion / Re: Y AXIS with 2x Ball Screw Alignment

« on: April 29, 2014, 07:51:55 PM »

Hi Ray,
Yes correct 0.1mm or 0.004"
The pitch is 15mm or 0.590"
Pulley diameter is approx 25mm or 1"

Breastfed

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General Mach Discussion / Y AXIS with 2x Ball Screw Alignment

« on: April 29, 2014, 11:01:40 AM »

Hi
I'm looking for some advise about how would be the best way to bring the 2 ball screws into alignment with each other, I have had some problems with Homing errors of approx 0.1mm so maybe with this can be a little better for what I'm looking at doing anything under <0.05mm would be ok.

As can be seen in the pictures the timing belt has adjustment on both the Top and Lower sides and equal tension on both sides would be required, My thinking here is that each of the Ball Screws must be sharing the load equally in both directions.

I'm also having thoughts about loosening the Taper lock on the Driven Ball Screw and somehow measuring how much backlash there is, perhaps this would allow me to find the sweet spot between both Ball Screws.

I'd appreciate any thoughts about how to go about this  
 
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5

General Mach Discussion / Re: MACH3 Pulse Frequency appears unstable (R3.043.066)

« on: April 25, 2014, 01:38:14 AM »

Well after way to much messing around and not finding a solution to my sudden problem I installed Win7, I've Installed Mach3 and immediately everything was OK with the Pulse freq.
The next step was to use RT_Seven_Lite to remove all the excess plus all the applicable XP tweaks where applicable and so far its been working OK
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General Mach Discussion / Re: MACH3 Pulse Frequency appears unstable (R3.043.066)

« on: March 10, 2014, 07:24:25 AM »

Hi,
I've got a frequency fluctuation problem and am trying to find the answer - but tried the link given and get a page error - not found - report. Any ideas where it is?
Regards,
GeoffB

GeoffB,
did you have any luck resolving this issue ?

I have tried everything with my dedicated "all in one" PC and still going ... so far a new HDD with a fresh install of XP (Std PC), all the  latest drivers, new Power supply, removed the PCI Parallel Port card just for fun, changed the CPU back to 2.8 GHZ, installed new Memory ...  optimized the settings and all with no change !!

So next I installed Mach3 on this old faithful desktop PC running Win7 that I do all my CAD stuff  on and bugger me the pulsing engine is ROCK SOLID just like I remember it was with the dedicated all in one PC.
Substance abuse coming soon !!!

When I run the driver test this shows a steady frequency under mach control ... is there any explanation for this difference with the driver test and the Pulsing engine instability on the Diagnostics Tab in Mach3 ?

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7

General Mach Discussion / Re: MACH3 Pulse Frequency appears unstable (R3.043.066)

« on: February 24, 2014, 05:55:59 AM »

I was sure there was another text document floating around on the web about how to optimise the PC for Mach3,  do you know if this is the latest ?
ftp://machsupport.com/Extra%20Information/XP%20Optimization%20Guide.txt

Still looking

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General Mach Discussion / Re: MACH3 Pulse Frequency appears unstable (R3.043.066)

« on: February 22, 2014, 11:50:55 AM »

OK Thanks I will check this out

Breastfed

9

General Mach Discussion / Re: MACH3 Pulse Frequency appears unstable (R3.043.066)

« on: February 22, 2014, 09:31:24 AM »

Thanks for the reply, I see a Pulse Freq of constantly changing from 57639 > 58815 > 57675 and then it drops back to 925 > 83 Hz and repeats again 57639....
When I run the Driver Test its rock solid, btw the PC is dedicated to this machine and there is no extra bloatware to speak of

any suggestions as to what I can do to diagnose this ?

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General Mach Discussion / Re: MACH3 Pulse Frequency appears unstable (R3.043.066)

« on: February 22, 2014, 07:03:55 AM »

Hi,
I would be grateful if you guys could take a peek at the Diagnostic page and tell me if the Pulse Freq is a steady number

Breastfed