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Messages - KB7CGA

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1
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 08:55:02 PM »
The output of the sensor is going strait to the printer port, no bob, no traces to anything on the
controller board, just a open pin #15 on the rs232 strait through cable, and yes I tested the cable
just in case ( I have been dumb before and grabbed a bad cable  ??? by accident. )

In the pulley configure I did make sure the ratio was 1:1 as the sensor directly reads the spindle.

slot size, on a 2" disk ,I would think that .2" wide would have been more than enough.

I can try another disk if you think it would help. I once saw the calculations some where
but making a new disk will only take a few minutes.

2
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 08:27:43 PM »
The spindle on the MaxNc uses  pwm to switch the spindle motor on an off as a variable speed control.

By switching a electronic rely vary fast, you can have mach 3 control the speed of the spindle.

Could this be interfering with the rpm counts?

Just took mach out of MaxNc mode, tried it.

results: no change

put mach back in MaxNc mode.

On the mill control board, pin 15 is not connected to anything or any circuit traces.
It's a unused pin.

Any Ideas hood?

Richard

3
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 08:13:11 PM »
I just set it up for the first time.

has any one had problems with the new changes or had to revert to a older
version?

should this work fine with my computer? (specs in first post.)

Did the new changes after 3.042.031 ( 032 to now ) knock out some
motherboards from using the index rpm feature?

I'm Stumped as to why it's not working right.

Richard

4
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 07:55:38 PM »
2" single pulse disk with a slot with of .2"

 
Mach3 R3.042.040 is the Lockdown version I'm using.

Mach3 R3.043.022 is still in Development and was not sure if i should try it until this
problem was resolved.

5
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 07:44:07 PM »
Cool video.

m3 s500 should give rpm of 500.

I don't have the option of mounting lathe tools on the spindle head as the stacked bearings
are in the way. cool move thou.

have a look at the second vid like in my post as it the same setup as I'm trying.

Richard

6
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 07:29:50 PM »
 just tried a debounce change, here are the results.

start with m3 s500

bebounce 0  =rpm 5800 to 5990

bebounce 1  =rpm 117 steady

bebounce 2  =rpm 117 steady

bebounce 3  =rpm 117 steady

does the debounce interval affect any thing?

7
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 07:23:58 PM »
I do intend to thread mill soon when i can get the cutters, but for now, I was going to
use a 60 deg lathe cutter in a vice on the table like in the vid link I sent.

I just tried them with no difference. trying the debounce now.

8
General Mach Discussion / Re: Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 07:17:35 PM »
Hello Hood

Spindle Feedback in Sync and spindle speed averaging are chosen.

m3 on a S500 I get a rpm of 5800 to 5990, not good in cnc land  :(

I should be more stable and at the correct rpm, that is more than 5300 rpm off .

9
General Mach Discussion / Mach 3 Spindle rpm inaccurate
« on: January 15, 2011, 07:01:18 PM »
In mach 3, My rpm dro is inaccurate and varies greatly.

I know mach x pulsing  driver was updated for faster bus computers,
Did it cause lower bus speed computers to have inaccurate rpm or inconsistency even
with single pules disk?

Even thou I have a mill, I'm interested in threading using both a 60 deg lathe
cutter in a holder mounted on the table as well as mill threading and turning
using  4 axis  control.

as in these videos as examples

http://www.youtube.com/watch?v=gUw9XKjMfUg

http://www.youtube.com/watch?v=yU_SeEvSsqE

http://www.youtube.com/watch?v=pQ83XRgRCyg

hope not to get in trouble as the links relate to my post.

    Dell Dimension 8300
    Intel Pentium 4 3.20Ghz Hyper Thread
    1 GB Ram
    Windows XP Pro 5.1.2600 Service Pack 3
    Nvidia Geforce FX5200 128MB 1024x768x60Hz

Mach 3

     Licensed Mach 3
     Version R3.042.04
     Mach x Pulsing Engines 4-11-2010
     Version 5.50.0.0
     Pulse Frequency 24998 rock steady
     Time in Int. 4.2 to 5.2
     PWM Base +140

Cnc Machine

     MaxNc 10 Open Loop 2005
     Omron EE-SX 872 Optical Interrupter
     Sensor has electronic circuit signal conditioning
     Direct connect to printer port pin 15 port 1 (no bob, 5volt + and ground from
     MaxNc stepper control board, connections are verified good.)
     5.09 volts on pin 15 active pulse window on printer port buss
     .025 volts on pin 15 no pulse window on printer port buss
     clean o scope signal


Setting

     Index De bounce = 0
     Index pin 15 port 1 enabled
     TurnDiags - 1.00.1 NOT enabled

I would like to have the spindle rpm work right so the feed will
follow with rpm, If it's possible.


Thank you.

Richard
kb7cga


10
How to change axis direction in hoss auto probe od script?

As the script starts, I start just above the center of the part less than 0.5 inch.
the tool moves to the left, Z axis drop -.5 inch, then moves farther left away form the part,
insted of right into the part to touch. Normal MaxNC 10's home to the left, my home switch
( modified ) homes to the right. So under homing and limits, it is checked for reversed axis as
needed for my setup.

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