Messages

211

General Mach Discussion / Re: MPG? handwheel?

« on: September 09, 2009, 06:25:55 PM »

I would like three axis toggle swithes or a 3 position switch to manually change axis,is that possible?
   tony

212

General Mach Discussion / Re: MPG? handwheel?

« on: September 09, 2009, 06:13:59 PM »

do the read outs change accuratly when the machine is moved via MPG?

213

General Mach Discussion / Re: MPG? handwheel?

« on: September 09, 2009, 05:12:45 PM »

cheers hood,
 how do you operate it ie switch it on and change axis

214

General Mach Discussion / MPG? handwheel?

« on: September 09, 2009, 12:12:27 PM »

Hi,
  I would like to add a hand wheel to my mach3/servoed (G340) mill.
is there a step by step procedure somewhere that I can referance to get me going?
    Tony

215

General Mach Discussion / Re: G28

« on: July 19, 2009, 04:32:07 PM »

I've sorted it now I didnt have the auto zero enabled on the homing section.
thanks anyway.

216

General Mach Discussion / Re: G28

« on: July 19, 2009, 12:26:20 PM »

the problem is that when I go into g28 it adds whatever the homing position is to the figures in machine position.
I canot fathom how to zero the machine position coordinates, in mdi, the zero buttons dont work, if you overtype then press enter it just reverts back to what was previosly in there.
 I need to get to a state where machine and work co-ordinates are the same.
the g54 ofset position is the same as the ofset shown in machine position when the work coordinates are zeroed.Again I can go ito fixtures but it will not allow me to edit the figures???

217

General Mach Discussion / Re: G28

« on: July 19, 2009, 05:10:02 AM »

The problem I am having is with the g54 fixture figures.what you suggested does not work when there are figures in machine position
or g54 and I cant seem to clear them.If you press reference home it seems to mess things up.

218

General Mach Discussion / G28

« on: July 18, 2009, 01:28:49 PM »

Could somebody please explain in laymans terms how to set up the g28 toolchange position.
I.E. how when I have zero'ed a job I want the machine to go to  x100 y 100 z20 when I code g28.
The exact sequence of events,to go through including the bizzare machine position coordinates system.
  cheers
   Tony

219

General Mach Discussion / Re: Help with new SS board and servo motors on Gecko drives

« on: July 08, 2009, 01:14:43 PM »

Have you matched your peak motor revs,with a reasonable max feed,i.e. are the motors geared correctly?
if they are just mounted directly onto the lead screws you could be over geared.

220

General Mach Discussion / Re: electro-pneumatic slide lock

« on: July 05, 2009, 12:44:48 PM »

vmax,
 when the pulses start the brake releases when the pulses stop the brake locks after a 1/2 second delay.Its that simple.
The pulses themselves trigger the 555 timer which inturn triggers the brake.
the cylinder is a single sided with a light spring holding it continuosly against the lock pad,it unlocks in a fraction of a second as there
is only a few microns of movement to release.
I would concede however that a stepper setup might lose steps that it will never make up but thats always the problem with steppers!.
The Idea is to use it on a Z quill lock. The delay on lock will keep the lock off during rapid direction changes when peck drilling.

I have built the 555 circuit and it all works fine.

 Fixing the backlash is a very expensive option on this machine.Or any knee type machine that has the quill rack and pinion motorised,
because the only option you have is to bolt a ballscrew on the side ala anilam. And even then when using a big milling cutter
it can draw the cutter in.
 I used to have a Beaver knee CNC which used a auto quill lock and it was a far better machine than the bridgeport type.

     Tony