Topics

51

General Mach Discussion / Acceleration calculations

« on: May 30, 2006, 12:18:19 PM »

Hello,
I dont know if it is pertinent to ask this on this forum, but here we go.
I am building an OEM machine which has a shuttle that weights 220lb. I want to size the servo to be used to move that shuttle as fast as possible and with as much acceleration as possible. This is to reduce cycle time as much as possible. The shuttle would make moves like the one at the end of the post (in INCREMENTAL MODE).

I am trying to come up with the max acceleration that a servo would be able to get me.
If I use a 3Kw ac servo, which has a constant torque of about 14Nm going trough a 4:1 reduction and a 2"sprocket (chain drive) gives about 2240N of force on that shuttle. Now If I want to find out the max acceleration I could get I would use F=ma, so 2240N=100Kg*a[m/s2] which solving for "a" gives a=22.4[m/s2] which converting to in/sec2 gives out 881 in/s2. Is that what I should use when tuning my servo? and should I expect that to be the acceleration i should get?

Hope I made sense.
thanks
Fernando

(shuttle movement test in incremental and inches)
G61
G91
F1500
G01 X10
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G01 X1
G4 P.1
G01 X1
G4 P.1
G01 X3
G4 P.1
G00 X-50

52

General Mach Discussion / PLC capabilities

« on: May 15, 2006, 11:28:05 PM »

Art,
Have you ever thought of making Mach3 have PLC capabilities, or make a stand alone software capable of doing this?
I have yet to see a decent software based PLC controller.
Best Regards
Fernando

53

General Mach Discussion / simultaneous motion starting at separate times

« on: May 01, 2006, 07:08:33 PM »

Hello,
This has something to do with my previous post about zeroing an axis while moving.

Is it possible to be moving an axis, and while it is still moving, start to move another axis?
I need to do this because the second movement is not necesarily linked to the first movement, this is, the second movement needs to be done as soon as a sensor is hit. If this is not possible, then I will have to have two computers runing two instances of mach3, to control each station separately. No inconvenience in having to computers, but might call for some user error if the code of the second machine, does not correspond to the code on the first machine.
Thanks Again
Fernando

54

General Mach Discussion / zeroing axis while it is moving

« on: April 28, 2006, 12:07:52 PM »

Hello,
Does anyone know if it is posible to zero an axis while it is moving? I need this not for a machining operation. I am building a machine, and i want to control it with Mach3.
What I need is Mach3 to move a servo that servo will take a piece of stock, and I want to zero the DRO of that axis when the stock passes trough a sensor and keep moving in the same direction, let me see If i can explain myself better:
the DRO is now at 10 and it is moving in the +direction, when the DRO reaches 12 the stock triggers a sensor, when that happens I need the DRO to reset at 0 and keep moving on he +direction.
Is this possible?
Regards
Fernando

55

General Mach Discussion / Wizzard tutorial?

« on: April 24, 2006, 12:37:11 PM »

Are there any tutorials or videos about making wizards?
What would be cool, would be to have the ability to program the operation of a machine (not necesarily a XYZ machine) like a plastic injector, where you could input the number of pieces you want to produce, input all the times for the different operations, amount of plastic to shoot, etc...
That would allow Mach 3 to be used in other aplications, like the coil winder machine, the example above etc...
Like user az7733 said: Teach us to fish!
Best Regards
Fernando

56

General Mach Discussion / Campbell´s THC

« on: March 28, 2006, 11:12:11 AM »

Hello,
Does anyone know how is the campbells THC interphased with mach 3 and the stepper drivers?
how is it connected to Mach3, does it need to be wired to a stepper driver and motor?
Hope somebody knows.
Fernando

57

General Mach Discussion / Kinematics

« on: February 21, 2006, 03:40:51 PM »

For all you folks that dont follow the groups on yahoo, there has been an ongoing talk about parallel kinematics implemented within Mach, by using the formulas implemented by art on some of the latest versions of Mach.
Its and interesting concept. Now as they say, the sky is the limit! (not really)
I was just hoping if anyone can tell me if series kinemetics can be implemented in the same way, I have been trying to do to do the math, and it is not as simple as for the parallel kinematics i have been practicing on.
Best regards
Fernando

58

General Mach Discussion / Anyone fluent in chinese?

« on: February 09, 2006, 08:41:49 PM »

I found a chinese company that offers step motors and drivers, but the page is in chinese, and altavista translator does a so so job.
They have a monster 45Nm stepper motor 6 amps, it says 30-300v, they offer the matching driver. I just want to know if both are compatible with each other and with Mach 3/4.
Im guessing the most common step motor would round the following characteristics:
2 phase
Bi polar
4 leads
1.8º step angle.
And a driver to be compatible with mach 3/4 it has to have TLL inputs and thats it?
I beleive this drive has a +step -step, +direction -direction, +enable -enable. and it has 110v input too.
page is http://www.stepping.cn/
Hope anyone can understand the page.

59

General Mach Discussion / tiny pc for mach 3

« on: February 03, 2006, 06:17:56 PM »

I just found these tiny pc´s ready to go, hardrive, ram processor and all.
http://www.boldata.com/html/minipc.cfm

They would make good control boxes, and could even fit inside our controller cabinets.
Regards
Fernando

60

General Mach Discussion / Cool thing for a pendant

« on: January 31, 2006, 07:22:31 PM »

Just found this:
http://www.ergodex.com/content.php?id=12
Looks like it would work great for a mach 2/3 pendant

A while back i found another page that had some different shaped keyboards, one even had a joystick, and another had a trackwheel, the page stated that if was used for video editting and custom aplications, but i cant find it anymore
Regards
Fernando