Rob,
> Lie, is your system using stepper drivers or 'real' servo drives with
encoders?
> For stepper drives I could draw up the schematics for this (using standard
logic > > circuits) quite easily.
I using 4 pcs of Pico univpwm servo drives with Panasonic 200W, incremental
encoder
200ppr.
Th
Would it help to park and lock the gantry at each power down? That way
the ends would be in sync at power up and until unlocked.
--
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/
Hardinge HNC/EMC CNC lathe,
Bridgeport mill conversion, doing XY now,
Zubal lathe conversi
Rob Jansen wrote:
> Jon Elson wrote:
>
> This is, in general, a bad idea to have a rigid tandem axis.
>
>
> Define "rigid". Even a 1-foot steel I beam has some flex...
As opposed to a gantry that is suspended on bearings from the
sides. Big machines, like vertical boring mills, bed planin
Hi,
I have bumpers that define square on my router.
I rapid into the bumpers, wham. Voilla! Square.
Move it off the bumpers, home to the switch.
Voilla! Homed.
Yes it's a stepper machine.
No, I don't do this very often, mostly when I am setting up and the
motors have been trying
Jon Elson wrote:
This is, in general, a bad idea to have a rigid tandem axis.
>
Define "rigid". Even a 1-foot steel I beam has some flex...
Depending on the size and material there is always some flex in the system.
I have a dual ball srews on both sides of my X-axis, some quick details on
the s
John Kasunich wrote:
> One approach is to consider the power-up state as "acceptable" meaning
> "since the motors were free-wheeling a minute ago, there can't be too
> much stress in the machine". Record the offset between the two encoder
> feedbacks before enabling the amps, and maintain that off
Kenneth Lerman wrote:
>
> Well, if one side can back drive the other, a possible sequence is:
>
> 1 -- Float side B and home side A. Side A will drag side B along with it.
>
> 2 -- Side B will be off of its home switch. Now lock side A (keep the
> servo active) and home side B.
>
> 3 -- Now b
On Mon, 14 Jul 2008, John Kasunich wrote:
> Date: Mon, 14 Jul 2008 21:11:13 -0400
> From: John Kasunich <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users]
Jon Elson wrote:
> I've seen pictures of the machine, it looks quite rigid,
> a welded steel box-tube frame with round slider ways bolted
> every 100 - 200 mm. A modestly robust gantry, although it looks
> like 80-20 extrusion plus several round ways between the two ends.
>> It might be worth c
Jon Elson wrote:
> Kenneth Lerman wrote:
>> Jon Elson wrote:
>>
>>> Ray Henry wrote:
>>>
Are there swivel joints between the two screws so that the motors can
move independent of each other?
>>> Excellent point, and no, there do not appear to be any joints
>>> between the two sides. (
Kenneth Lerman wrote:
>
> Jon Elson wrote:
>
>>Ray Henry wrote:
>>
>>>Are there swivel joints between the two screws so that the motors can
>>>move independent of each other?
>>
>>Excellent point, and no, there do not appear to be any joints
>>between the two sides. (Dr. Lie has sent me photos
On Mon, 2008-07-14 at 13:02 -0400, Kenneth Lerman wrote:
>
> Jon Elson wrote:
> > Ray Henry wrote:
> >> Are there swivel joints between the two screws so that the motors can
> >> move independent of each other?
> > Excellent point, and no, there do not appear to be any joints
> > between the two
Jon Elson wrote:
> Ray Henry wrote:
>> Are there swivel joints between the two screws so that the motors can
>> move independent of each other?
> Excellent point, and no, there do not appear to be any joints
> between the two sides. (Dr. Lie has sent me photos of the
> machine.) That is going
Ray Henry wrote:
> Are there swivel joints between the two screws so that the motors can
> move independent of each other?
Excellent point, and no, there do not appear to be any joints
between the two sides. (Dr. Lie has sent me photos of the
machine.) That is going to make it MUCH harder to pr
Are there swivel joints between the two screws so that the motors can
move independent of each other?
On Mon, 2008-07-14 at 20:54 +0700, Lie Seng-Thok wrote:
> Hello,
>
> I just nearly completed the project of retrofitting of CNC router,
> with tandem configuration on the Y-axes
>
> (i.e. 2 m
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