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Messages - ger21

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2961
General Mach Discussion / Re: scaling of project in Mach3 ??
« on: December 04, 2013, 05:51:09 PM »
First thing I'd do is try one of the Cut3D mm posts, rather than an inch post. Is the model in inches? If so, scale the model to mm's in Cut3D if you can.
Or even better, configure your machine in inches if those are the units you work with.

A bug was discovered last week when running inch code on a metric Mach3 setup, but I don't know if that's what you're seeing.

2962
General Mach Discussion / Re: Closed loop control using encoders?
« on: December 04, 2013, 11:46:40 AM »

Why are you and others so against encoders?

Because your machine should be 100% reliable if set up correctly. Adding encoders won't make it any more reliable, they'll just give you the opportunity to stop it when things go wrong.

Quote
If you have a NEMA 34 or larger motor you have literally 5 times the torque I do. 380 oz-in motors don't have much overhead when driving against a 1/2" bit mounted in a router plowing through hardwood plywood. Feed rate changes as little as a few IPS under those conditions make the difference between a toasted bit and a successfully cut part.

The issue here is that you have a machine capable of a certain level of performance. You want it to perform like a machine with much higher capabilities. Encoders aren't going to do that. The "overhead" that you mention is up to you. The reality is that if the machine stalls or loses steps, then you should be running at least 15%-20% slower than you're trying to. That's how you get a reliable machine.

As far as burning bits. Try slowing down the rpm. As far as achieving recommended chip loads. You'll need at least a 5-7HP spindle to achieve those, as 3/8 spiral router bits are easily capable of cutting 3/4" deep in one pass at 800-1000ipm. With a normal router for a spindle, you'll stall it instantly at those feedrates. When you have an underpowered machine (which most of us have), you run at reduced depth of cut and lower rpms to keep the bits from burning, while getting the most you can from your machine and it's capabilities.





2963
General Mach Discussion / Re: Getting DRO values out of Mach3
« on: December 04, 2013, 07:26:12 AM »
While I agree that you should solve the problem rather than finding a workaround, something like this may be of interest to you.
http://www.rogersmachine.net/encoderinterface.html
Imo, it shouldn't be needed, and is a "fix" for a machine that doesn't work properly.

2964
General Mach Discussion / Re: Home to machine zero?
« on: December 03, 2013, 02:01:16 PM »
 Not to get OT from original question, but as long as I have some experts here... Do you know of a custom screen set I might look at that would be less "robust" and more dummied down for the kids to use?


Yes, the one in my signature below. ;)

2965
General Mach Discussion / Re: Home to machine zero?
« on: December 03, 2013, 11:38:39 AM »
  After that I click goto home and I get a move to the workpiece zero. 

There is no "Goto Home" button. You clicked Goto Zero.

2966
General Mach Discussion / Re: Strange movement behaviour
« on: December 01, 2013, 01:49:29 PM »
I can't say for sure that it'll fix the issue. The drive has no manual that specifies the minimum voltage?

2967
General Mach Discussion / Re: Table is not in level?..... cnc3040
« on: December 01, 2013, 12:18:58 PM »
I'm not an expert with gcode but looks like line N200 of the gcode the Z is at 3.175 which to me is too high. To me this should have been 0.00

This is the retract height, and is correct. It should NOT be 0.00

There's nothing wrong with the g-code.

The proper procedure is to mechanically adjust the table to be as flat as possible, then mount a sacrificial spoilboard to it, and surface that flat with the machine. Then, any work you attach to the table will be flat for your v carving.

2968
General Mach Discussion / Re: Mach3 and Vcarve6 CNC3040
« on: December 01, 2013, 12:05:18 PM »
Feed rates are dictated by the material your cutting, the tool your using, and the rpm the spindle is turning. It also has a little to do with trial and error to get the best results.

2969
General Mach Discussion / Re: Strange movement behaviour
« on: December 01, 2013, 12:03:37 PM »
Also, what are your pulse widths set to in the motor tuning screens? Make sure they are at least 5, and try 10-15 and see if it makes a difference.

2970
General Mach Discussion / Re: Strange movement behaviour
« on: December 01, 2013, 12:02:30 PM »
You need to measure the DIRECTION pins WHILE your jogging.

pins 10-13 and 15 are input pins only, and don't really have anything to do with the issue you're having.

If pins 14 and 16 are 3.3 volt, then your direction pins probably are as well.

Do your drives support 3.3v signals?

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