On Thu, Dec 10, 2009 at 06:34:01PM +, Andy Pugh wrote:
> Neater still would be an air bearing arrangement.
> Tighten the table down hard with belville washers.
That sounds inspired!
OK, "hard" implies the washers wouldn't be series stacked, but parallel,
I guess [1]. (I'm imagining one or more
Martin
Nice work. My kids would be hanging out in your yard all year
One option could be the HobbyCNC Driver and motor kit. Its a low cost way
to get upgraded and learn how the various components work at the same time.
These kits run $280 for a three axis board with three 305oz-in steppers
Wow...that was a lot of stuff
First of all I have to say that I am really impressed with what some of you
guys have put on the web as projects.
Kirk, I went to your web site and you tear into a machine like I tear into a
locomotive. Your lathe project was impressive. Have you finished it yet ?
On Thursday 10 December 2009, Andy Pugh wrote:
>2009/12/10 Gene Heskett :
>> Just one Q though, wouldn't this also need an oil injector to keep it
>> from rusting since the air is going to have water in it?
>
>Clean and dry should be enough, but our mating parts were aluminium
>and stainless, so I
>>I think we have only got evidence of 4 motor wires.
Yep, sorry. I missed that in the previous message.
Since the driver board is named Chop... something I bet it is a true
chopper drive board.
Still I'd at least dump the drive boards, keep the power supply and go
with something like this
On Thu, 2009-12-10 at 17:47 -0600, Chris Radek wrote:
... snip
> Judging by the four TIPxxx transistors and MTR1_PH[1-4] on that first
> pinout, I bet these are full step or half step unipolar drives and
> motors.
>
> In this case I agree with Dave 100%.
>
> Chris
Et tu, Brute. What happened to
2009/12/10 Chris Radek :
> Judging by the four TIPxxx transistors and MTR1_PH[1-4] on that first
> pinout, I bet these are full step or half step unipolar drives and
> motors.
I think we have only got evidence of 4 motor wires.
--
atp
---
2009/12/10 Kirk Wallace :
> Martin will
> need to get into the guts of EMC2 and HAL more than most, which may be a
> deal breaker.
He is already further down that road than many, having started off
reading the HAL manual. not realising that stepconf was there.
I suspect that altering the existin
On Thu, Dec 10, 2009 at 06:25:24PM -0500, Dave wrote:
>
> I'd scrap the motors, the boards, and the power supply and start with a
> new PS, step drivers, and motors and use a LPT port and EMC2 to drive
> everything.
Judging by the four TIPxxx transistors and MTR1_PH[1-4] on that first
pinout,
On Thu, 2009-12-10 at 18:25 -0500, Dave wrote:
... snip
> Even a low cost bipolar setup should run circles around an old unipolar
> setup. If those were servos, I'd try to save them but those stepper
> motors can be replaced with decent Nema 34 bipolars for about $70 each
> or less.
>
> You a
Those controls are 20+ years old and the control design is likely even
older than that.
My guess is that you have unipolar motors. I have some motors - Slo
Syn's here that have 5 terminals. The one terminal is ground and the
other 4 are the 4 phases.
If you disconnect the motors - I bet you
On Thu, 2009-12-10 at 22:27 +, Andy Pugh wrote:
> 2009/12/10 Hubert Bahr :
>
> > Does anybody else have an
> > explanation for 4 phases with only 4 wires?
>
> It might be 2 phase bipolar, but labelled oddly.
> ie imagine that P1-P4 drive a motor wire each, at +40V if the pin is
> high and 0V
Craig, and list,
You are correct. It is a Cardinal Engineering unit.
I had forgotten about the name on the spindle belt cover. As you can see in
the picture the belt cover is not present because when the head as close to
the table as it is for most of the work I do, the belt cover does not
move out
2009/12/10 Hubert Bahr :
> Does anybody else have an
> explanation for 4 phases with only 4 wires?
It might be 2 phase bipolar, but labelled oddly.
ie imagine that P1-P4 drive a motor wire each, at +40V if the pin is
high and 0V if the pin is low.
Here's plan: after checking that the drive to
On Thu, 2009-12-10 at 21:31 +, Andy Pugh wrote:
> 2009/12/10 Martin Pinkston :
>
> > Andy, the 26 pin header pin out sheet is wrong. the Centroid guy saw a
> > picture I took and told me I had a different board than what he initially
> > thought should have been in this unit.
> > Let me see if
Martin Pinkston wrote:
> ...snip
>
> Andy, the 26 pin header pin out sheet is wrong. the Centroid guy saw a
> picture I took and told me I had a different board than what he initially
> thought should have been in this unit.
> Let me see if I can take a picture of the pin out schematic and post it
2009/12/10 Martin Pinkston :
> Andy, the 26 pin header pin out sheet is wrong. the Centroid guy saw a
> picture I took and told me I had a different board than what he initially
> thought should have been in this unit.
> Let me see if I can take a picture of the pin out schematic and post it on
>
2009/12/10 Gene Heskett :
> Just one Q though, wouldn't this also need an oil injector to keep it from
> rusting since the air is going to have water in it?
Clean and dry should be enough, but our mating parts were aluminium
and stainless, so I don't know how much of an issue it would be.
--
at
On Thu, 2009-12-10 at 14:53 -0500, Martin Pinkston wrote:
... snip
> Squareness has never been an issue. I was amazed to find the head swept in
> less than .0005. And even if the head is ever out, it's just a matter of
> four very large bolt which hold the column to the base. Just shim to adjust.
>
Martin,
That looks real familiar. I believe that to be one of the many conversions done
by Roland Friestad at Cardinal Engineering. Back in '88, that package went for
about $8500.
The high school, at which I taught, had one driven by an Apple IIe computer and
is now driven by a PC (DOS). AFAIK,
Some of the operations that are "within" the Centroid controller are things
like a circle drilling program, circle milling program, pocket milling
program, face milling program, letter/number engraving. All called up on a
single one line of code. It will also do some simple macros as well.
And yes
>>Centroid OS has a very limited memory to about 250 lines on NC code and
no buffer.
Wow, how old is this Centroid control??
250 lines seems miniscule.
Dave
Martin Pinkston wrote:
> Good Afternoon listers,
> I have posted a picture of my mini mill.
> The reason I wanted to do a conversion over
On Thursday 10 December 2009, Rainer Schmidt wrote:
>You can start out with the cheapest table you can find because you can
>take the motor and probably the mount to another level later when you
>mill the el cheapo into the ground. Backlash is not a problem as long
>as you have control over your to
On Thursday 10 December 2009, Andy Pugh wrote:
>2009/12/10 Gene Heskett :
>> Given the Tommy bar clamps on the one you showed in the link, a pair of
>> small double acting air cylinders and an electric solenoid would be
>> ideal.
>
>Neater still would be an air bearing arrangement.
>Tighten the tab
On Thu, 2009-12-10 at 10:23 -0800, Kirk Wallace wrote:
... snip
> The last board looks like the, or an, axis motor driver. How many of
> these do you have? I bet those red and black wires come from the first
> board. The screw terminals on the middle left edge go to the motor or
> motors? It looks
On Thu, 2009-12-10 at 13:10 -0500, Gene Heskett wrote:
... snip
> didn't consider that because plugging in the motor and running it with
> emc is
> 10x more accurate anyway.
>
> >Erik
>
> --
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo
2009/12/10 Gene Heskett :
> Given the Tommy bar clamps on the one you showed in the link, a pair of small
> double acting air cylinders and an electric solenoid would be ideal.
Neater still would be an air bearing arrangement.
Tighten the table down hard with belville washers.
When you want to ro
On Thu, 2009-12-10 at 11:22 -0500, Martin Pinkston wrote:
> Good Afternoon listers,
> I have posted a picture of my mini mill.
> The reason I wanted to do a conversion over to EMC was because the Centroid
> OS is very antiquated and when I saw what EMC would do, I knew it would make
> the mini mill
On Thursday 10 December 2009, Erik Christiansen wrote:
>On Thu, Dec 10, 2009 at 07:08:21AM -0500, Gene Heskett wrote:
>> 3. face up & making a sprocket, or lathe style & carving gears, backlash
>> will be a problem. So it may be wise to add a 2nd lock brake so that the
>> table is locked pretty sol
2009/12/10 Martin Pinkston :
>
> Good Afternoon listers,
> I have posted a picture of my mini mill.
www.212steam.blogspot.com
I get the feeling that was all very expensive back in 1988.
I wonder what it all does?
The pinout that you published a while ago seemed to show pulse and
direction input
Good Afternoon listers,
I have posted a picture of my mini mill.
The reason I wanted to do a conversion over to EMC was because the Centroid
OS is very antiquated and when I saw what EMC would do, I knew it would make
the mini mill more flexible.
The Centroid OS has a very limited memory to about 2
On Thu, 2009-12-10 at 09:23 -0500, Rainer Schmidt wrote:
> Gears have backlash period. And if they don;t have backlash out of the
> box... they increasingly will have it.
> There's a method of countering that, but it increases wear as it uses tension.
> I rely on my steel loaded timing belts instea
If the BeagleBoard port works out, we could then look at other,
cheaper, ARM9 boards. The BeagleBoard has all kinds of stuff we
don't need (e.g., video, including 2 or 3D acceleration), and leaves
out ethernet, plus may be subsidized (and might have some
availability issues). If we can get to
Gears have backlash period. And if they don;t have backlash out of the
box... they increasingly will have it.
There's a method of countering that, but it increases wear as it uses tension.
I rely on my steel loaded timing belts instead. I use the type made for the car
industry. Incredibly strong PU
My 5 axis is made with two el cheapo rotaries one a vertex and the
other a lesser name, both have backlash so I tend to lock up B when I
can, else for both rotaries I hand code the gcode so drive is from one
direction only wherever possible.
If you put the worm into full engagement they jam, there
You can start out with the cheapest table you can find because you can
take the motor and probably the mount to another level later when you
mill the el cheapo into the ground. Backlash is not a problem as long
as you have control over your toolpath. I build a 4th out of 2 inch
thick al using a 1.5
On Thu, Dec 10, 2009 at 07:08:21AM -0500, Gene Heskett wrote:
> 3. face up & making a sprocket, or lathe style & carving gears, backlash will
> be a problem. So it may be wise to add a 2nd lock brake so that the table is
> locked pretty solidly when the motor is not moving it. I'm still figuring
On Thursday 10 December 2009, Pat Lyons wrote:
>If a brake is being used, what about a direct drive setup?
>
>-pat
I hadn't given that any real thought. This one has a brass thumbscrew with
IMO very limited holding power. Some sort of an eccentric to pull the table
down and lock it against it
If a brake is being used, what about a direct drive setup?
-pat
On Thu, Dec 10, 2009 at 7:08 AM, Gene Heskett wrote:
> On Thursday 10 December 2009, Pat Lyons wrote:
> >Hey guys,
> >
> >I'm going to add a 4th axis to my gettup here on my lagun emc refit, and
> >wanted to ask for suggestions.
> >
On Thursday 10 December 2009, Pat Lyons wrote:
>Hey guys,
>
>I'm going to add a 4th axis to my gettup here on my lagun emc refit, and
>wanted to ask for suggestions.
>
>My plan is (as of now) to find a rotary table on the cheap (ebay,
> craigslist etc) and mill up a motor mount to it with encoder f
2009/12/10 Pat Lyons :
> any comments/suggestions/do's&donts???
I have converted one of these:
http://www.axminster.co.uk/product.asp?pf_id=453684&name=table&user_search=1&sfile=1&jump=44
It took me too iterations. Initially I just made a motor mount and
retained the existing bearing arrangement
Hey guys,
I'm going to add a 4th axis to my gettup here on my lagun emc refit, and
wanted to ask for suggestions.
My plan is (as of now) to find a rotary table on the cheap (ebay, craigslist
etc) and mill up a motor mount to it with encoder feedback, and use the 4th
channel on my 5i20.
I've neve
2009/12/10 BRIAN GLACKIN :
>
> H... According to the site on this drive your considering - its USB
> based
>> http://www.phidgets.com/products.php?category=11&product_id=1000
> Not to throw a wet towel, but isn't that a no-go for EMC?
I doubt it would work at all with EMC (but if it appears
Martin
I am having a little trouble picturing your mill. I have a mini
mill about 125lbs and a small mill about 350lbs. The Rong Fu's I have
looked at (Square Column) weigh about 750. Can you post a picture on
your Blog? However, the fact it has ball screws is a very definite
plus. Als
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