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Messages - zarzul

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161
General Mach Discussion / Re: Mach3Turn
« on: September 25, 2007, 12:34:04 PM »
Mike,

The clearance is how far away from the stock you want to pull out to when doing your rapids.

Arnie

162
Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help
« on: September 20, 2007, 05:57:18 PM »
Hutchison,

I didn't mean to sound too techie.   I just figured anyone who would breakout the soldering iron and have a go at their machine would be an Electronics guru.

regeneration stops the motor by turning it into a generator and driving the kinetic energy back into the controller,  the end result is if you spin the 3/4 turn speed pot on my lathe's regen motor controller from full speed to zero the motor is stopped before you take your hand off the pot.  Nice feature for safety but can be stressful on machine or parts.  Not required.

IR comp is a feedback feature, kind of like a closed loop speed controller where you call for a speed, actual speed feedback is sent to the controller and the controller will boost output if speed drops to maintain it at a constant speed.  The IR comp is looking at current and resistance to provide the same response and is very close to closed loop, but you don't have to pickup any outside signals because the drive controller already has the IR built in.

Chopper is just a description of how the power is converted from AC to a variable voltage DC,  the full AC wave is rectified at the highest speed setting (highest DC voltage) and only part of the full AC wave is rectified at a lower setting,  (part of the wave is chopped off).

PWM to V converter, a circuit that takes a pulse (mach3 speed control signal from the parallel port) and converts that pulse signal into a Voltage (a lot of the controllers will accept a 0-10 voltage signal as the speed demand signal)  The PWM signal is a fixed frequency with a variable width (on duration).


I took a look at that Fincor drive  http://www.saftronics.com/PRODUCTS/DCDRIVES/2330/2330L.htm, it looks like it would work fine, maybe a little pricey but it probably cost $230 usd new.  It may not have the option of the 0-10 volt signal input,  if you can get the full model number and look at options in the manual.

163
Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help
« on: September 20, 2007, 05:08:37 PM »
You might want to consider going with the treadmill DC motor.  I believe the DC motors give you more constant torque over their speed range.  They are fairly compact and cheap.
Couple that with a regenerative ir comp dc motor chopper drive, and a pwm to v converter, then you would have full CNC controlled spindle, speed, stop / start.  The regenerative drives
can stop on a dime and the IR comp gives them a boost when loading the spindle to maintain the speed constant.
I picked mine up on ebay, drive and motor for less than 100 total.


164
General Mach Discussion / Re: Question for Brian re new Video Window
« on: September 20, 2007, 03:27:02 PM »
Brian,

That is looking really good with what you are doing with the video window changes.  Keep up the fine
work!!

I have a little problem and I think you talked about it in another post,  my video is now a mirror image.
Were you planning on putting a flip image button?

Thanks Arnie

165
Show"N"Tell ( Your Machines) / Re: emco 5pc spindle motor help
« on: September 20, 2007, 03:23:11 PM »
Hutch,

I have converted two machine spindles but not a EMCO.  Is that an AC or DC spindle motor? 

 I did a D&M labvolt machine, just put a new DC motor controller in,  you can pick these up on Ebay,  KBIC or others.  They have a voltage 0-10v input control for the speed and a contact input for starting and stopping.  The 120v models output upto 90vdc typically,  the 240v models output 180vdc.  The other one I did was a 7x12 mini-lath,  removed the motor and put a 2 1/2hp treadmill motor on it with a KBIC dc motor controller on it also. 

Did you use the conversion detailed in Digital Machinist?  Is that a lathe or mill?  There is also an article in the same  magazine on converting a emco compact 5 pc lathe, using all of the old hardware.

Arnie

166
Others / Extra turn wizards
« on: September 13, 2007, 02:33:25 PM »
I posted these in the VB & Wizard area before and thought they should be moved to here.


Unzip and put in Mach3\turnaddons\MY TURN 
Put the bitmaps in Mach3\turnaddons\MY TURN \bitmaps


Left taper to Face
Right taper to Face
Parabola - use with care
End Groove - for o-ring groove on the face
ID groove - for internal groove for o-ring or snap ring

167
General Mach Discussion / Re: retrofit - steppers or servos?
« on: August 31, 2007, 04:06:39 PM »
Bill,

Looks like a great project, lots of work though.    Good job on the pictures,  the drivers I assume are the 3 boards on the right side of the picture.

The driver schematic is probably the most important part,  if there is a way to inject the step and direction signals into it then you are halfway there, and you would be able to abandon the rest of the controller.

Can you post those somewhere or send them to me off list, if you can scan them.

Arnie

168
General Mach Discussion / Mitutoyo probe help
« on: August 31, 2007, 12:41:31 PM »
I just bought a probe from ebay and was wondering if anyone has any experience or info on this type.

It is a Mitutoyo probe head MTP-1M M2   Mod.#321-010A

I looked at the Mitutoyo web page but nothing there. 

Arnie

169
General Mach Discussion / Re: retrofit - steppers or servos?
« on: August 31, 2007, 11:07:19 AM »
Bill,

The I is most likely a 1.  1.8 deg step is most common, that gives you 200 steps for 1 full rotation of the shaft. 

Can you take some pictures of the machine? 

I would  try to use the existing components, they are most likely to be correctly sized for the equipment, all you have to do is to figure out how to interface it.

Do you have any schematics, or part numbers on the Allen Bradley parts. 

Get some more part numbers and info.  maybe we can help.

Arnie


170
General Mach Discussion / Re: Simple drive controller circuit
« on: August 31, 2007, 10:55:40 AM »

Good recommendation,

another combination of that is the l297 & l6203 chip.  Do a search on google for those two and you should come up with some circuits.
here is a good one, http://www.majosoft.com/engraving/html/stepper_driver_board_with_l297_and_L6203.html ,

I have built one and I used the application notes from  ST to create the circuit.  Go to their web site and look at their app notes section for these
two chips.

Arnie

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