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Messages - RICH

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5811
Show"N"Tell ( Your Machines) / Re: CNC CONVERSION - 6" ATLAS LATHE
« on: September 02, 2009, 10:17:58 PM »
         X AXIS BALL SCREW INSTALLATION
The x axis will receive a different ball screw as the carriage is rather limited in what it can provide for as shown in Figure 20. The carriage requires machining to open up the cavity such that the ball nut can travel inside the carriage. Sometimes post machining of a casting you remove internal stresses and the thing warps some. Hopefully this will not happen as the other surfaces of the carriage were already fine tuned for fit to the bed. Carbide end mills take care of cuttin thru the sand, stone and other crap in the casting.

Figure 21 show the carriage cavity ready to be machined. Set up is very important as there is not that much surplus material. You want the screw to travel parallel to the dovetailed ways in the carriage. You take you time. By the way before this is done details were drawn to see just what would be removed and how the trust and axial bearings would be mounted.

Figure 22 shows the completed machining with the ball screw laying in the cavity.
RICH

5812
Show"N"Tell ( Your Machines) / Re: CNC CONVERSION - 6" ATLAS LATHE
« on: September 02, 2009, 10:16:29 PM »
TAIL END BEARING INSTALLATION
A bearing will be provided for on the tail end of the Z axis. The bearing is mounted inside the mounting block and then the motor mounting plate is attached to it. Figure 17 just shows some rough work done on the plates before drilling and machining. All the plates are precision 6061 AL stock. Figure 18 shows the bearing just lightly tapped into the mounting block. A boring head was used to bore the hole into the mounting block.

Figure 19 shows the tail assembly mounted to the lathe. The block was temporarily attached to the lathe bed similar as was done at the spindle end. The saddle is mounted, shimmed and the ball screw turned by hand to set the location of the tail and spindle bearings. There should be no binding of the carriage over the full travel along the bed. That done, the tail and spindle bearing holders received alignment pins.
RICH

5813
Show"N"Tell ( Your Machines) / Re: CNC CONVERSION - 6" ATLAS LATHE
« on: September 02, 2009, 10:15:04 PM »
Dimensions are taken and a drawing is made so the mounting of the ball screw bearing and stepper motor can be figured out. This is shown in figure 16.
RICH

5814
Show"N"Tell ( Your Machines) / Re: CNC CONVERSION - 6" ATLAS LATHE
« on: September 02, 2009, 10:13:40 PM »
       CHECKING THE SADDLE TO BED FIT

With the screw adjusted to the bed as before, the tail end will be worked on next.
Note the small clearance of the nut along the bed axis ( I said it was tight! ) in figure14.


The fit of the carriage is again checked and all is well, parallel, perpendicular, and size shims can be used an even shim can be used. The back of bed was cleaned up and the surface checked for square before making a back mounting block. Fortunately no machining or scraping was required.
See figure 15.

5815
Show"N"Tell ( Your Machines) / Re: CNC CONVERSION - 6" ATLAS LATHE
« on: September 02, 2009, 10:12:27 PM »
Well the conversion continues.

     SADDLE WORK
 
            New bottom guide plates will need to be made due to the nut location. The contact surfaces and the spare saddle that touched the bed required re-machining to remove wear. The surfaces were made parallel and shiming would be the same for both sides. You really take your time on the machining along with stoning, grinding, or scraping of the surfaces will be required. You can’t screw this up or the x axis will no longer be run perpendicular to the z axis. The finished saddle resurfacing is shown in figure 12 along with the bottom guide plates which are made from tool steel.

Figure 13 shows the  new holes being drilled into the carriage for the guide plates. There is were a knee mill really comes in handy as I have al lot of room on my small mill. That tap extension ( you know the stuff you buy but never use ) just did the trick.

5816
General Mach Discussion / Re: Button style tool holder???
« on: September 02, 2009, 08:21:28 PM »
Try EMCO, JDL, and MSG and look under indexable toolholders.
RICH

5817
General Mach Discussion / Re: Where to download r3.042.020
« on: September 02, 2009, 08:13:05 AM »
Refreshed and got 029 like you said.  ;)
RICH

5818
General Mach Discussion / Re: Very green newb, Is this possible?
« on: September 02, 2009, 07:49:22 AM »
How much drift are you talking about?
RICH

5819
General Mach Discussion / Re: Where to download r3.042.020
« on: September 02, 2009, 07:43:28 AM »
Hood,
I just looked again and it's listed there as the lockdown version.
RICH

5820
Mach3 and G-Rex / Re: NO service from Geckodrive company
« on: September 02, 2009, 07:36:37 AM »
All i can say is that Gecko has provided supper service to me.
I still remember Marcus, called me at home, after his work day ( not manny folks do that for a hobbiest! ),  when i first started out, and spent an hour with me checking out my wiring, etc. They have always responded to mail messages, technical questions, etc .
Can't speak for your experience which seems very different. I believe most others echo my experience.

RICH

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