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
2009/12/10 Pat Lyons p27...@gmail.com:
any comments/suggestions/do'sdonts???
I have converted one of these:
http://www.axminster.co.uk/product.asp?pf_id=453684name=tableuser_search=1sfile=1jump=44
It took me too iterations. Initially I just made a motor mount and
retained the existing bearing
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 its
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
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
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
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
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 instead.
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
2009/12/10 Martin Pinkston martinpinks...@gmail.com:
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
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 solidly
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
2009/12/10 Gene Heskett gene.hesk...@gmail.com:
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
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. Please
On Thursday 10 December 2009, Andy Pugh wrote:
2009/12/10 Gene Heskett gene.hesk...@gmail.com:
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.
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
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 to
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,
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.
2009/12/10 Martin Pinkston martinpinks...@gmail.com:
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
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 on
On Thu, 2009-12-10 at 21:31 +, Andy Pugh wrote:
2009/12/10 Martin Pinkston martinpinks...@gmail.com:
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.
2009/12/10 Hubert Bahr h...@hbahr.org:
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
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
On Thu, 2009-12-10 at 22:27 +, Andy Pugh wrote:
2009/12/10 Hubert Bahr h...@hbahr.org:
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
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
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 are
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, I
2009/12/10 Kirk Wallace kwall...@wallacecompany.com:
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
2009/12/10 Chris Radek ch...@timeguy.com:
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
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 your
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
On Thursday 10 December 2009, Andy Pugh wrote:
2009/12/10 Gene Heskett gene.hesk...@gmail.com:
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
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 ?
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
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 of
36 matches
Mail list logo
