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Messages - RICH

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1941
General Mach Discussion / Re: G76 threading issues - any thougts?
« on: June 19, 2013, 07:01:00 AM »
Glad you have something that works even though we have no definitive answer as to the actual cause in your case.
I can live with your case closed.  ;)

RICH




1942
For threading you only use a sensor which provides a single index pulse per revolution of spindle.

RICH

1943
If the Kernal Speed of 25kz satisfies your velocity requirements for a given value of steps per unit going to
a higher kernel speed will not be of any advantage.

RICH

1944
CS-Lab / Re: CSMIO/IP-S Closed Loop?
« on: June 17, 2013, 10:28:58 PM »
CV580,
I know this is off topic, but you haven't lived until you have hand drilled and rifled a 50 cal 48" long barrel.
BTW, it was the best shooting muzzle loader my friend ever had!  ::)

RICH

1945
General Mach Discussion / Re: axis zero moved
« on: June 17, 2013, 10:20:43 PM »
Start by having the velocity set to a low number, say 10 ipm and the accel = 1.
Now just keep doubling the the vel until they skip. Say they skip at 120 ipm, then somewhere between
60 and 120 is the max velocity. So try 100, if they don't skip then leave it at that setting. Now at 100 increase the accel to 2 and start doubling it until they skip. Say it skips at accel =6, then reduce the vel to say 80 and try.
You will find a max velocity and accel value quite quickly.

Whatever that value is that they skip at some max vel and accel reduce the velocity by maybe 30%. Now you
do some testing while machining and over time you will have a reliable value for vel and accel.

Just trial and error. Even if the values are calculated you still need to test and confirm.
Of course having a motor curve always helps.

What you really want is power and that is speed x torque.

If you can set the drives for microstepping and greater than 10 is of no value.

BTW, make sure the steps per unit are correct.

RICH

1946
General Mach Discussion / Re: Router cuts angles wrong
« on: June 17, 2013, 11:36:32 AM »
3.503 is 3.3503?
Dimensioned backplot for your use attached.

RICH

1947
General Mach Discussion / Re: speed sensor/lathe threading
« on: June 17, 2013, 10:52:30 AM »
how did you mount the magnet

Crazy glue and you will / can adjust the clearance and location of the sensor from the magnet ( just an 1/8" diameter and high approx and Radio Shack had them)

Some have purchased the CNC4PC board and it worked fine with a slotted disc, I have one but never used it.
Probably cheaper than a Hall Effect.
CNC lathe threading is great and you can do things that makes manual threading antiquated.

Threading, for that matter any lathe work, will only be as accurate as you lathe SYSTEM. Ged rid of the backlash so there is no need for BC ( worth the effort).

RICH

1948
Here is simple test as far as postioning.
Air cut the program to and including line N180. ( so get rid of the second pass). The DRO will be at
X &Y coordinates of N180 and the location of the head should be that distance from XY=0.
If it is not there then your steps per unit may be wrong, or, it can be attributed to nunmber of things.

Measure accurately and also consider spindle runout.  

RICH

1949
Post your xml file.

BTW, I can't speak for WIN-CNC and will not entertain a comparison nor adaptation of Mach to their
boards / whatever.

It may not be a mechanical issue as the only thing at this point is that the gcode pathing is not the problem.

RICH


1950
General Mach Discussion / Re: speed sensor/lathe threading
« on: June 17, 2013, 09:01:42 AM »
Both will work and a simple optical along with one slot in a disc with basic dimensions of the disc slot and diameter per info in the Mach manual. A disc made from a CD and painted black saves time.

The Hall Effect I used actualy has two sensors and only one is used. Sensors have a response time so be carefull if purchasing a Hall Effect and also don't use reed type sensor since many of them don't have the response time /
are not fast enough for higher rpm's. Attached is a pic of the Hall effect sensor mounting showing that adjustment
and mounting can be easy if your space limited.

Multiple slotted disc's / input are not supported and there is no advantage to it for threading.

There is write up in Members Doc's called Threading On the Lathe and suggest you may want to have a
read.

RICH


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