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Messages - 01sporty

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1
Here's the corrected code for the benefit of the next person suffering brain fade.

G90 G95 (ABS DIST MODE / FEED PER REV)
(CREATED 12/09/2022 )
(#3 - Cutoff TOOL 3 )
M6 T0303
g00 x-.2 z0
z.005 x.16
z-.46
M3 S1200
g04 P2
g01 x.082 f.002
g00 x.16 z-.45
z-.48
g01 x.081 f.002
z-.456
g00 x.16
z-.502
g01 x.080 f.002
z-.456
g00 x.16
z-.506
g01 x.080 f.001
z-.456
g00 x.16
z.005
m5
m9
x-.2
z0
M30
N470

2
Thanks for the feedback Graham.
It is a lathe.  There is spindle feedback.  Most of my programs are CAM generated.  I scribbled this out by hand. The M6 is in all of my programs, doesn't seem to hurt anything.

And, I now see the problem.  Lack of G01.  Duh.

3
Simple little program.  At least it should be.  Once I put in a G0 rapid, that's all it will do.  The feed words have absolutely no affect.  If I comment out all of the rapids, it feeds fine.  I ended up just substituting a large feed value for the G00's but I'd still like to know what's up with this program.

G90 G95 (ABS DIST MODE / FEED PER REV)
(CREATED 12/09/2022 )
(#3 - Cutoff TOOL 3 )
M6 T0303
g00
x-.2 z0
z.005 x.16
z-.456
M3 S1200
g04 P2
F0.002
x.082
(g00)
x.16 z-.45
z-.478
F0.002
x.081
z-.456
(g00)
x.16
z-.499
F0.002
x.080
z-.456
(g00)
x.16
z-.506
F0.001
x.15 z-.502 
x.080
z-.456
(g00)
x.16 z.005
m5
m9
x-.2
z0
M30
N470

Thanks,
Walt

4
I machine little stuff.  A #000 center drill won't tolerate a lot of misalignment.  A .020" carbide drill, set for a .200" depth is a bit more forgiving, but not by much.

So, when I read about a commercial product that promised easy alignment of tools, I was very interested.  The system is designed for CNC swiss automatics but the principle is the same for any lathe. 

At it's heart, the inventor mounted a camera/microscope in the bushing of the machine and came up with software that looks at a simple target, plots lots of points on the target as the spindle is rotated and determines the exact center of the spindle.  After that, it's a relatively simple matter to align the rest of the tools to that center.

The system looked to be beyond my budget (I didn't ask), so I decided to see if it couldn't be done on the cheap.

So.

I bought one of these: https://www.ebay.com/itm/313868557442

It has a 8mm diameter so I figured it would be a simple matter to mount it in my 5C spindle.  It's never that easy.  The casing isn't electrically isolated so the camera kept cutting out whenever it was grounded to the machine.

So.

I made a PVC casing for the camera and tried again.

It worked.

5
General Mach Discussion / Re: Looking for help with a spindle motor.
« on: April 10, 2022, 03:00:41 PM »
Well, I'm a happy camper.
 
I finally got time to give it some serious attention and it's now running just the way it should. Smooth and silent from 30 to 3000. I didn't try going over the design rpm but I'm sure it would.
Right out of the box the acceleration and deceleration seem quite acceptable.  Once it actually is moving the spindle rather than just sitting on the floor it will be easier to tune it in.

The gory details:  My first problem turned out to be the way I had been checking for a signal. My VOM has a frequency function and I had been using that.  I finally realized the computer doesn't push a signal out, it offers it up.  If the motor isn't accepting the signal, no sinking occurs and there is nothing for the VOM to read.  Once I realized that, I went back and took a much closer look at my setup.  I had plugged the motor into the wrong power supply so it was not getting adequate voltage.  So much for doing things according to memory.  Once it had the proper supply, things got turning and from then on, it was just a matter of sorting out the settings to get it spot on.

Now I finally feel comfortable with ordering the rest of the stuff needed to complete the installation.

6
General Mach Discussion / Re: Looking for help with a spindle motor.
« on: April 09, 2022, 07:08:35 PM »
Quote
Can you program such features into your servo?

Yes, but I'm hoping that it works in Mach3 since it's more convenient.

Fortunately, it's one of the parameters that's actually documented.

There are literally dozens of parameters that come with no explanation.
I guess you're supposed to just know this stuff.

7
General Mach Discussion / Re: Looking for help with a spindle motor.
« on: April 09, 2022, 10:34:40 AM »
You guys are trying to drop a V8 into a go kart.  Good as conversation starter but you're really not gaining anything.  Power plants need to be sized to fit the rest of the machine.

That massive pile of chips you see in the picture is from that equally massive .043 drill.  Face, chamfer, drill to a depth of .260. That's 6D to save you the trouble of getting out your calculator.  No coolant, no pecking, 80 parts.
I could do that all day long with a 30 watt motor.

That sewing machine motor starts so violently it has snapped a 3/8" belt, not to mention what that does to the bearings.  That's why it has that 1/8" belt, it has more stretch.

The servo motor was simply selected because it's sized correctly and is controllable without having to stand around and babysit the machine.

8
General Mach Discussion / Re: Looking for help with a spindle motor.
« on: April 08, 2022, 04:57:56 PM »
Good idea.  I probably won't have time to try it today.  I'll check back and let you know what happens.

9
General Mach Discussion / Re: Looking for help with a spindle motor.
« on: April 08, 2022, 04:34:58 PM »
It's a home built.  Built around a pair of Parker 404XR linear actuators.

Made for light, precision work.  Jewelers lathe type stuff.
The specs will make you kinda giggly.
8 um (.0003") accuracy over its entire travel.
1.3 um (.000051") repeatability.

10
General Mach Discussion / Re: Looking for help with a spindle motor.
« on: April 08, 2022, 01:02:30 PM »
Why use a stepping servo motor to drive a spindle?
It's small (nema23). 
It's very affordable.  Well, it was until it became apparent the ESS would be an essential ingredient.
It has great torque for its size and the torque curve is flat over its entire rpm range.
The rpm will be spot on and stay there if the power demand increases.
It's controllable for soft start and end.
All of this assumes, of course, that I actually get it to work the way its supposed to work.

Right now I'm using a sewing machine motor.  It has good rpm and torque but the rpm is manual and is really vague.  I have to use ipm rather than ipr.  The rpm has to be changed manually between tools so it needs to be constantly tended.

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