[hoss2006]

Was just playing around to show what the Keling 40 volt driver CAN do.
I usually run the X around 125 IPM but as you can see in the video, it's capable of peaking a lot higher.
Hoss

[ame="http://www.youtube.com/watch?v=CkWpRz2dXXs"]YouTube - 225 IPM Rapids[/ame]

[hoss2006]

Made an improved Mach axis calibration video using the Set Steps Per Unit button on the Settings page that tacpyro noticed.
The genius of Artsoft thought of everything.
Eliminates the need for doing the math and editing the motor tuning.
Much more accurate too, I wouldn't have taken the steps to 10 decimal places but it does.
Hoss

[ame="http://www.youtube.com/watch?v=XkO5tc-jSxw&feature=channel_page"]YouTube - Improved Mach 3 Axis Calibration[/ame]

[BobWarfield]

That little function in Mach for calibration is pretty sweet. I didn't find it at first either. I used to do the calculation backwards at least once per axis, making the error twice as bad and having to go again.

I definitely agree with using a longer standard. I use a 2-4-6 block.

Here is a thought instead of the dial indicator. Put a dowel pin in a collet and use a micrometer to measure the outer distance between the dowel pin and the far side of a 1-2-3 block. You'll need a little larger mic, but you can be pretty accurate that way.

Are you going to map your screws with your DRO? I don't recall what the DRO's accuracy was, but if you have a good one that ought to be even more beneficial. That's on my list to do. I scored a deal on a nice Fagor DRO for a 16x40 lathe, so I only have 2 axes, but that'll be fine.

Cheers,

BW

[hoss2006]

I only have the Shumatech DRO which is sitting in a box, somewhere.
Kept it to put on the lathe.
good idea on the dowel pin.
Hoss

[Teyber12]

great vid- that is really moving!

btw whats clamped on the table- is that one end for the turnion table?

[hoss2006]

great vid- that is really moving!

btw whats clamped on the table- is that one end for the turnion table?

nope, just an old angle plate I made ages ago.
The trunnion will have to wait a bit.
I'll be installing the interrupter on the spindle for the C3 board this weekend,
see if I can get it to cut threads.
Hoss

[hoss2006]

Here's a few pics of the spindle bracket mods for the C3 interrupter.
Should be well protected.
Hoss

[ellik]

I was actually experimenting with a similar idea a few weeks back using a simple reflective sensor. My problem was getting Mach 3 synchronizing feed to the spindle RPM. Once the Z axis starts to move the feed rate stays constant no matter how the RPM changes during the feed. Have you had any experience with this yet?

EK

[BobWarfield]

Cool setup for the sensor, Hoss.

Isn't it amazing how much more professional these things start looking when they're made on a CNC.

Best,

BW

[Teyber12]

that looks insane hoss.

How are you going to attach that to your mill head? do you drill and tap holes into the casting?

[hoss2006]

that looks insane hoss.

How are you going to attach that to your mill head? do you drill and tap holes into the casting?

Hey Teyber,
I've had that bracket on the mill for about 2 years, made it for one of my first projects, the Dewalt high speed spindle attachment.
Have used it for several other projects too.

Ellik,
no experience with it, Yet.
Plan on using another one for my lathe attachment and my 10x22 lathe.
That's where I really want the threading control, for the mill just really want RPM output.

Bob,
Can't help it, force of habit.
Hoss

[Adamj12b]

Looks great. I designed something just like that before, but only ever made the disk and sensor mount. One problem ive had with the disk with the single hole is its not optimal for speed sensing. Its closed about 98% of the rotation and only open about 2%. Ive been looking into how to fix this for when I finally get some time. I believe the best solution would be to mill half the disk so it would be open 50% and closed 50%.

-Adam

[hoss2006]

Nice design Adam,
I hear ya on the disk, I've seen others that were open 90% and only had a 10% tab left.
I went with what Cnc4pc diagram shows for the C3, hopefully it works since it's
pretty well balanced but we'll see.
I have a portable laser tachometer to compare the output.
Hoss

[hoss2006]

Good news, the disk works with the small hole.
Spent a lot of time troubleshooting when it wouldn't even give a signal on the diagnostics page.
Opened up the back of the console only to find out some yahoo had hooked up the C3 output to the wrong C10 input# a few weeks ago.
Good to go now.
Checked the Spindle Speed Averaging box under config after the video and it gave a more stable rpm output.
Was too late to get into the threading stuff, just went thru mach turn and set up some of the config settings.
Hoss
The washer in the pic is holding the disk 1/8 from the head while I mounted it so
it lined up on the center of the bracket.

[ame="http://www.youtube.com/watch?v=etdbEsh2-Jk"]YouTube - C3 Index Pulse Board[/ame]

[Starleper1]

how are those bearings holding up at that speed? I was thinking about making a pulley to spin at 8k.

[hoss2006]

how are those bearings holding up at that speed? I was thinking about making a pulley to spin at 8k.

Didn't realize but it's been almost 14 months since the high speed pulley mod.
Running great, have made lots of timing pulleys with it running flat out for 1/2 hour per pulley (5) with a few minute break in between.
Still doesn't even warm the head much beyond room temp.
One of the lucky ones I guess.
Hoss

[ame="http://www.youtube.com/watch?v=6mJ29g-RcdU&feature=channel_page"]YouTube - belt conversion overdrive[/ame]

[hoss2006]

The ABC's of CNC is an instructional video for newbies for learning about hobby CNC technology.
The video goes through all of the basics of machine construction (lead screws, stepper motors, etc.)
as well as the types of software (CAD, CAM, and controller software), and the actual workflow from concept,
through CAD drawing, CAM cutter path generation,
G Code creation, and the final cutting of actual parts.
The video ties all of the various parts of the CNC process together, in an easy to understand, and thorough interface.
Get the DVD Today.
I just finished watching it. It's geared more toward CNC routers but it'll give
a total newbie an idea about what can be accomplished and how to go about it.
Hoss

[yang_cnc]

Hoss:

I just read through this thread (well, not really "through", I read about 20 pages), I just want to express the how I am impressed by your work, and by the quality and quantity of information you and other folks here provided. It is a super good reading for me, I just want to thank you for your great work!

[hoss2006]

Back to working on the trunnion table now along with the 4th axis rotary table
that will go with it.
It's looking pretty easy to add some bearings so it will last longer.
I've had this table laying around for several years, a cheapo from Harbor Freight
but it's better made than I expected, made in India instead of China so maybe that's it.
It has anti backlash adjustment but I'll be modifying the drive gear shaft for
including bearings and adjustment.
Speaking of rotary table 4th axis', if you have a Phase II from LMS, J Fettig has free plans to convert one to a 4th axis.
Here's a sampler of some of my parts, the pdf can view the part in 3D.
Hoss

[BobWarfield]

This will be interesting.

RE backlash, you can look for relatively backlash free drives on eBay from Bayside and the like. Harmonic drives in other words.

This thread on hypocycloid drives is also quite interesting:

http://www.cnczone.com/forums/showth...ht=hypocycloid

You have to get past the earlier posts to get to the hypocycloids.

Will you be adding brakes to the axis? Probably not needed for a mill of this size I guess.

Cheers,

BW