[hoss2006]

I was just looking at the specs for the drivers I got (8060s) and noticed this:

Full or Half Current Mode: Sw4: 0= Half Current

They are all currently set to 0 so I wonder if that is my problem? That is just how they were set when I received them - the pin descriptions on the driver itself doesn't mention anything about this pin 4. Should they be set to Full Current?

Looking close at the pics on your thread, I'm assuming the driver in front is for the Z axis.
Based on the jumper positions, as best I can see, you have it set for 3.7A (should be 3.2)
I would imagine because he sent you an 8 wire 640 motor and you have to wire it Bipolar series to be able to run it from your 72 volt power supply.
Bipolar parallel is the preferred method as you get more power over a longer range than in series.
In series, the 640 wants about 95 volts for best output so you're going to loose some speed there too.
You got it as good as you can get it.
Maybe have him replace it with the KL34H280-45-4A when they get back in stock,
should work a lot better.
I just noticed keling changed a bunch of the components in his bf20 kit from what they were and from what I would recommend.
He doesn't know much about how the parts need to work together.
He dropped the power from 72V that Ellik used to 50V and added the 570 motors that I use
for the X and Y, theres no need to run an 80V driver that he's recommending
other than being able to handle the 6.3 amps of the 8 wire 640 in bipolar parallel.
If you substitute the KL34H280-55-4A , you only need 4.5A, but their out of stock.
lots more money for drivers that aren't going to work any better at 50V
than the ones that I'm using.

This WAS the package and I still have it listed on my site.
The purpose of it is to get geckos and high voltage.

(3) G201X 7A, 80VDC
(2) KL23H2100-30-4BM 495 oz-in for X , Y axis
(1) KL34H280-45-4A STEPPER MOTOR 640 oz-in for Z axis
(1) KL-7212, 72VDC, 12A Power Supply
(1) C11G multifunction Breakout Board

these components would work well together.
As well as my components, maybe.
Hoss

[mrcodewiz]

Looking close at the pics on your thread, I'm assuming the driver in front is for the Z axis.
Based on the jumper positions, as best I can see, you have it set for 3.7A (should be 3.2)

... snip ...

I will have to check that when I get home but yeah, I had to wire it in series so it would work with the 72 volts. I really wanted the KL34H280-45-4A instead since it was a better fit. I emailed him about the possibility of doing an exchange.

As an update - I did a few tests last night. I did several G0X2Y2Z2 moves, back to 0, etc - all without a problem. I then ran drivertest.exe and while it said the system was 'exceptional', the line looked terrible.

This morning, I unhooked the PC from my X2, hooked it up to the G0704, reconfigured it and it ran perfectly! Not only were there no stalls when I jogged but the motors sounded like they were running much smoother.

So now I am going to walk through Mach's XP optimization instructions and see if I can figure anything out. I can still only get 150IPM on the Z so hopefully the other stepper will fix that.

[ncdeftones]

Hey Hoss, you've probably had your machine tore down farther than any of us so I was wondering what you think about extending the Y travel. Seems to me that it could extended by spacing the Z column with a spacer block kind of like people do with the little X2 mills. I was looking at how the dovetails continue all the way up until they butt against the column and that got me to thinking that there is probably at least .5 to .75, maybe even an inch, of additional travel that could be had.

[mwood3]

Hey Hoss, you've probably had your machine tore down farther than any of us so I was wondering what you think about extending the Y travel. Seems to me that it could extended by spacing the Z column with a spacer block kind of like people do with the little X2 mills. I was looking at how the dovetails continue all the way up until they butt against the column and that got me to thinking that there is probably at least .5 to .75, maybe even an inch, of additional travel that could be had.

I think anything you gain by this method would almost for sure be lost in rigidity...surely another joint there would induce some flex (i have already seen some footage that suggests the flexy column is already the weak point.)

[mrcodewiz]

It's probably OK, really. The problem is that I had the rear screw in too far when I installed the gib and front screw. I tightened the front and then loosened the rear (and repeated) to get it tightened up but what that did was it pressed the spacer at an angle and jammed it into the channel. It didnt bind the gib but it made it so I couldn't push the gib deep enough into the dovetail to get rid of all the slop. It was so close it was barely noticeable.

I think if I had started with the rear screw out, pushed the gib all the way in with the front screw, then installed the rear that it would have been OK at least for a while.

BTW, I made a new screw for the rear Y gib. I think the head was 16.5 mm -I can now snug the gib up perfectly so this is probably a better fix for this issue than a spacer/washer.

[hoss2006]

Hey Hoss, you've probably had your machine tore down farther than any of us so I was wondering what you think about extending the Y travel. Seems to me that it could extended by spacing the Z column with a spacer block kind of like people do with the little X2 mills. I was looking at how the dovetails continue all the way up until they butt against the column and that got me to thinking that there is probably at least .5 to .75, maybe even an inch, of additional travel that could be had.

yes i've looked into it, already have some stock and longer bolts.
I get 7.125 Y travel right now stock, there is no point in adding
a spacer to the column to get more travel because the spindle to column distance is 7.250.
Any spacer thickness for the column would also have to be done to the head.
This head is not as simple to add a spacer as the X2.
Going to all that work just for another 1/2 inch is pretty pointless to me.
Another 1 1/2 is all this saddle is capable of anyway.
I'd suggest trying the mill as is for a good while and if you run into actually NEEDING more travel.
look into it then.
Hoss

[photomankc]

Or I could get an RF-45 with lots of Y travel and just sign the divorce papers.

[hoss2006]

Updated the Electronics page with a few more selections,
Also added a chart of the motors from keling to quickly see what their amps and voltages are.
http://www.g0704.com/G0704_electronics.html#keling
Didn't add the itty bitty ones or the monsters, just ones useful for the g0704.
Hoss

[ncdeftones]

yes i've looked into it, already have some stock and longer bolts.
I get 7.125 Y travel right now stock, there is no point in adding
a spacer to the column to get more travel because the spindle to column distance is 7.250.
Any spacer thickness for the column would also have to be done to the head.
This head is not as simple to add a spacer as the X2.
Going to all that work just for another 1/2 inch is pretty pointless to me.
Another 1 1/2 is all this saddle is capable of anyway.
I'd suggest trying the mill as is for a good while and if you run into actually NEEDING more travel.
look into it then.
Hoss

Yeah I know greedy me. I've got some parts I want to make that are a hair under 7.5" and I was hoping to be able to make them without having to reposition the work piece. I can make do with what I have. I just thought if it were a simple mod it might be worth doing. Yeah a RF45 would be nice, but I'd probably be signing divorce papers as well. This little venture has tied up enough money.

I ordered a KL23H2100-35-4B 381 oz/in motor, another KL-6050 driver, and a LMS rotatory table so I can make a 4th axis. That should help me get the most from my machine and help me do some small cylindrical parts, timing gears, etc. That's going to have to do me for a while until I start making some $$$ off of this machine.

[photomankc]

Updated the Electronics page with a few more selections,
Also added a chart of the motors from keling to quickly see what their amps and voltages are.
G0704 Electronics
Didn't add the itty bitty ones or the monsters, just ones useful for the g0704.
Hoss

Nice. That makes the choices pretty clear and beats trying to dig it out of his site. He has good products but man is that site unpleasant. Those 570's are really one of the best match-ups for any of the reasonable cost drivers. Pretty clear why you picked them.

Just as an FYI for others. I for some reason thought that the 305/425's from HobbyCNC were the same as the 425's from Keling. Wrong! The HobbyCNC is a 4.0A 60V motor vs the Keling that is 3A 80V motor. I can get my new P/S to put out 55V without much problem but 60V is pushing it up towards it's maximum adjustment and that is still not enough to properly juice the Keling 425's. I have noticed that the HobbyCNC motors don't seem to go quite as fast as other motors. I noticed way back when trying to build my own microcontroller/driver for it. It would not get to the same RPM as some of the other similar motors. They do have a lot of grunt at low speed though.

I did find there were a few other suppliers of the 570's out there since they are not listed as in-stock on Keling, but they were getting rather expensive. If he still doesn't have 570's in stock when I go to setup the Z axis I may step up to a NEMA34 in the 640oz range.

[daman]

I did find there were a few other suppliers of the 570's out there since they are not listed as in-stock on Keling, but they were getting rather expensive. If he still doesn't have 570's in stock when I go to setup the Z axis I may step up to a NEMA34 in the 640oz range.

I emailed Keling and they do have 570's in stock. For some reason they don't have them in stock on the webpage but their eBay shop shows them.

I'll soon order 3 pieces for my project. The 570oz model seems to be a good compromize and keeps all XYZ steppers the same size.

[mrcodewiz]

Updated the Electronics page with a few more selections,
Also added a chart of the motors from keling to quickly see what their amps and voltages are.
G0704 Electronics
Didn't add the itty bitty ones or the monsters, just ones useful for the g0704.
Hoss

Hmm... I hadn't noticed that 1200 Ouncer before. That may work better for my Z. Quite a bit more expensive though.

[photomankc]

I emailed Keling and they do have 570's in stock. For some reason they don't have them in stock on the webpage but their eBay shop shows them.

I'll soon order 3 pieces for my project. The 570oz model seems to be a good compromize and keeps all XYZ steppers the same size.

Guess I should have emailed then. Dang it.

[hoss2006]

I did find there were a few other suppliers of the 570's out there since they are not listed as in-stock on Keling, but they were getting rather expensive. If he still doesn't have 570's in stock when I go to setup the Z axis I may step up to a NEMA34 in the 640oz range.

Homeshopcnc is one that carries pretty much the same 570 stepper but for $73.
Only $8 more.
If kelings been out of stock, this is where I've gone next.
Hoss

[mwood3]

how does this power supply look? 350W 48V 7.3A Regulated Switching Power Supply [K009] - eBay (item 170504122489 end time Oct-21-10 01:18:01 PDT)
I think it is the same thing as the Keling KL-350-48 48V/7.3A
110V/230V $59.95

I couldn't find the published Amp output for the keling supply

I assume the 350 in the part number means its rated at 350W?

[hoss2006]

how does this power supply look? 350W 48V 7.3A Regulated Switching Power Supply [K009] - eBay (item 170504122489 end time Oct-21-10 01:18:01 PDT)
I think it is the same thing as the Keling KL-350-48 48V/7.3A
110V/230V $59.95

I couldn't find the published Amp output for the keling supply

I assume the 350 in the part number means its rated at 350W?

looks like the same thing, worth saving $30 to wait a couple weeks for delivery.
have to wonder how cheap we could get the motors and drivers if we just find his source too.
Will have to start looking, patient people could save a lot of dough.
Hoss

[mwood3]

looks like the same thing, worth saving $30 to wait a couple weeks for delivery.
have to wonder how cheap we could get the motors and drivers if we just find his source too.
Will have to start looking, patient people could save a lot of dough.
Hoss

same thing i was thinking...im pretty patient...look at my join date...took me until last month to buy the mill

[mwood3]

I have searched high and low for the same stepper motor anywhere else...keling sells them on ebay but for the same price...and modelshopcnc sells them but for $77.32 including shipping...

[hoss2006]

Here's the second HSM video, tried some slotting, pocketing and drilling.
These are roughing passes so don't be expecting beautiful finishes,
I didn't let it run the finish pass here, those are slow and boring.
Still made some nice round pockets and sharp edges.
Ran up to 150 IPM.
Changed the belt drive back to the timing belt quill version, spins at 7200 rpm.
Hoss

[nomedia="http://www.youtube.com/watch?v=tHQv1bsLhfs"]YouTube - G0704 HSM Test 2[/nomedia]

[mwood3]

Very Nice!! love the disapearing bit trick (nuts)