11 x 26 Conversion With Centroid Acorn control and closed loop steppers

jumps4

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my lathe was a Wholesale Tools 11 x 26 very similar to the G0602 Grizzly shown but bigger ( 10x22 )
Another build in pictures.
I have been collecting parts for a while now and have finally started to make the required parts to convert my lathe.

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jumps4

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The last 2 pics are of the sheet metal brake I had to make to build the enclosure.
The cardboard box is how they shipped my z-axis 2505 double Ball-nut screw ( it was fine )
there is a 2000 line per rev encoder belt driven off the spindle. No more Mach3 for me on a lathe.
Thanks for viewing
Steve
 

Boswell

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looking good. Looking forward to seeing the build progress.
 

jumps4

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Today I spent some more time on the enclosure.
The lower front panel will be removable for cleaning.
I have 36" LED lights to install above the spindle.

Thanks for viewing
Steve

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TomS

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Steve - good to see you posting again. I'm watching your build closely as I've been thinking about converting a lathe to CNC.

BTW - Why the new build? As I remember you built a 9 x 20 CNC a few years back.
 

jumps4

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Hi Tom
My wife was diagnosed in April with terminal small cell cancer (less than a month to live ).
It was in her lungs, liver and spine. since then we have been doing treatments 3 times a week and all the cancer is gone for now.
after completing treatments she is back to normal with no signs at this point.

Ya I know I don't need it, I want it. lol
My 9x20 lathe works fine and has made hundreds of parts. Mach3 though has limitations on a lathe and that was the reason for mach4.
mach3 can at times get lost with only one pulse per rev on threads of any length.
I just completed another run of 100 Ford spark plug thread repair inserts on the 9x20.
With such limited time my shop looks like a bomb went off and I have to move three things to do one.
The 9x20 is really a light lathe and limited on pass depth, where this 11x26 has a very heavy, ridged base capable of passes of .050 .
For such a low cost lathe, they put the metal where it counts.
I'm installing a 4hp inverter duty motor controlled by the Acorn board and Centroid software for constant velocity capability and with a 2000-lpr encoder on the spindle
my threading will finally be reliable at greater depth per pass without loss of finish quality due to rigidity .
Thanks for viewing
Steve
 
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TomS

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Hi Tom
My wife was diagnosed in April with terminal small cell cancer (less than a month to live ).
It was in her lungs, liver and spine. since then we have been doing treatments 3 times a week and all the cancer is gone for now.
after completing treatments she is back to normal with no signs at this point.

Ya I know I don't need it, I want it. lol
My 9x20 lathe works fine and has made hundreds of parts. Mach3 though has limitations on a lathe and that was the reason for mach4.
mach3 can at times get lost with only one pulse per rev on threads of any length.
I just completed another run of 100 Ford spark plug thread repair inserts on the 9x20.
With such limited time my shop looks like a bomb went off and I have to move three things to do one.
The 9x20 is really a light lathe and limited on pass depth, where this 11x26 has a very heavy, ridged base capable of passes of .050 .
For such a low cost lathe, they put the metal where it counts.
I'm installing a 4hp inverter duty motor controlled by the Acorn board and Centroid software for constant velocity capability and with a 2000-lpr encoder on the spindle
my threading will finally be reliable at greater depth per pass without loss of finish quality due to rigidity .
Thanks for viewing
Steve
Wow! You and your wife have been through a lot. Good to hear she's doing better.

I recently got my mill back running after moving to the Reno, Nevada area. As you might remember it's a virtual clone of your build. I love it!

Keep the pictures coming. I'm enjoying it.
 

jumps4

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For the few days I have been working on the electrical and electronics.
after a sleepless night caused by no motion from the steppers, I found that the Centroid Acorn board defaults to 200000 steps per second in the setup wizard.
No problem right the closed loop driver say up to 200000kh... they lie
I had to go into the acorns main config and lower the frequency to 100000 steps per second for these drivers and everything works perfect now.
This will have no effect on the motion of the machine at 100000 steps per second, that over 300ipm.
thankfully there were some great videos by "Franco" and others on YouTube showing how to change the settings.
I also had to order a programming cable from China that hooks to my computers serial port to configure some extra features in the motor driver settings.
The VFD is a real HaunYang 4.0kw with an optional braking resister, not a knock off so it will have a 400w braking resister installed to stop spindle fast.
with this I'll be able to ridged tap, instant stop and reverse.
The spindle will stop instantly if either stepper misses steps, something is binding, e-stop is pressed or a crash happens.
Thanks for viewing
Steve

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jumps4

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I have made some progress on my new lathe project and everything has gone well.
The Centroid Acorn board and software are a dream come true compared to my mach3 lathe.
I have automatic control of everything working including the spindle and automatic tool measurement.
my next project will be either gang tooling or an automatic tool turret... or both.
The right side screen on the desk are the Acorn lathe also, with extra keyboard and mouse so I can work on cad/cam from a chair instead of having to stand and program. I can run the lathe from either side and I will be able to monitor progress by video.
Thank You for viewing
Steve



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jumps4

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I have started building an Automatic Tool Turret for the lathe.
I'm using a one way sprag roller clutch for the brake when force is on the cutter and a 30 to 1 Nema 23 worm drive.
The drive will be 8 position.
 

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jumps4

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As usual everything was going to well and I'm not sharp enough to stop when tired...
I was cutting the taper for the tool locks and wanted to move over to position "-.120" but I typed "-120" and pressed enter before reading my typing.
So the next photos are repairing the damage I caused by not reading.
All fixed now but I had to make a few fixtures to keep from causing more damage while filling in the damage with weld.
the copper and brass parts keep the weld in the area I need it without causing me to re-machine everything in the area.
Thanks For Viewing
Steve
 

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JimDawson

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What I really want to know is what kind of anti-grav unit are you using to float the bearing above the sprag assembly. :alien: :grin:

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Karl_T

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Nice save. A measure of how experienced a machinist is by how the fubars are recovered.
 

jumps4

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I made some more progress today.
I ground, drilled and tapped the side tool mounts.
I finished the tapered tool locks for the front tools.
Thanks for looking
Steve
 

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jumps4

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I completed The mount parts and did the assembly today. I still have to make the drive shaft and spring loaded
coupling that holds pressure against the sprag when cutting.
Thanks for viewig
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jumps4

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Today I designed and built the drive coupling.
The shaft has a straight spring wire through it that locks if turned clock wise and loads spring tension in the direction of cutting force
down on the tool. This takes the load off the worm gears and loads all the force on the sprag clutch.
All tool changes are in a clock wise direction and 45 degrees each. When the correct tool number is reached the direction reverses
2 degrees. The reverse direction does not rotate the tool it loads the spring in the drive coupling locking everything tight.
Now that it is finished I have to learn how to program the tool changes and I have no idea how to to do that yet...
Building it may have been the easy part!
I'll ask for help on the Centroid Forum
Thanks for viewing
Steve


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