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Messages - fdos

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111
Screen designer tips and tutorials / Re: DRO Format strings?
« on: May 09, 2007, 07:43:01 PM »
Well we have determined %=number +makes it only positive sign, the rest control the length before and after the decimal place maybe.

Wayne....

112
Show"N"Tell ( Your Machines) / Re: Waynes Leadwell VMC Retrofit
« on: May 09, 2007, 07:33:40 PM »
LOL   Old endmills have a multitude of uses.   Make excellent boring bars for lathes too ;)

Here's a recent recent 2nd lifes for old old cutters.

1st 2 are threadmills including the one in the video (HSS) the smaller threadmill is an old solid carbide cutter, I use that for 0.75mm pitch internal threads on model aero engines.

The other pic is a form drill which drills for 1/4" whit tap, chamfers the hole and creates a spotface all in one operation.

Wayne....

113
Show"N"Tell ( Your Machines) / Re: Waynes Leadwell VMC Retrofit
« on: May 09, 2007, 06:35:44 PM »
Boring Innit!    Thought someone might be inspired if I posted it though ;)

Not enough vids of machines working in here!   Lets see some more.   When the Hardinge is running I'll be sure to show a job or two.

The ability to host on Youtube is useful though ;)

Wayne....

114
Easiest way to find source of noise is to eliminate it by switching off electrical items which may cause interference.

Is there anything that may have changed recently?  Have you checked the condition of your encoder cables?   Look them over very carefully, ensure you still have good grounds without ground loops.  If in doubt try another cable.

Wayne....

115
Show"N"Tell ( Your Machines) / Re: Waynes Leadwell VMC Retrofit
« on: May 09, 2007, 05:22:28 AM »
The cutter used above is an old burnt out 7/16" 3 flute endmill which has been reground into a threadmill.

Wayne....

116
first just try to determine where the noise is coming from.

Try running your program without the spindle running.

Is this a router?

Wayne....

117
Show"N"Tell ( Your Machines) / Re: Waynes Leadwell VMC Retrofit
« on: May 08, 2007, 07:19:29 PM »
More video.

Some single point threadmilling done today

Yes it is supposed to be a lefthand thread  :P

Wayne....


<a href="http://www.youtube.com/v/FQ1rYX559Gk" target="_blank" class="new_win">http://www.youtube.com/v/FQ1rYX559Gk</a>


118
OK thats good information

Sounds to me like you have a noise issue, either getting into the Step input on the drive or the encoder cables.

Brushed spindle motor?   Could be brushes arcing a lot.

These noise issues are the reason I like to use differntial signals for both encoders and Step/dir signals.

In retrospect with this new information it's unlikely to be drive tuning.

Wayne.....

119
Well who knows!    If you tell mach to move say 1"  what do the DRO's in mach say?

If it's been working ok for a year and not now then something has changed surely?

In one of the cases you gave above the distance fell short, in the other it gained?

Wayne....

120
If you're DRO's in mach are saying -1" and the job is ending up 5 thou short of 1" then I agree with Brian your servo tuning is off.  Or you are losing some steps somehow.   

If your DRO's read .995" then there's something else wrong.

Wayne....

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