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Messages - RICH

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891
Quote
Not sure about duplicating the fault, they both occurred towards the end of the last tool path.

By the last pass I take it that it was the finish pass.
What you can do is insert some code such that there would be a move to a check location
along with a short dwell so you can inspect position to see if skipping occurred.Strategicaly place it
in the program ( can be in multipe places ) to see if yo can repeat the problem. If it's random then it is difficult and may not yield any results. I have a seperate digital read out on my mill so can compare against the DRO.Poor mans readout can be a a simple mark / something on the motor shaft so you can check position at some point in time. Skipping can occur and you won't even hear it and result can be that the axis continues on with a loss of position or the axis just runs away.

What is important is how much torque you have while machining at feedrate. In the machining you have a lot of very small combination moves and thus the accel is almost instant in time. You shold minimize the torque required  to just move the axis and have ample torque available for required acceleration of the code
and headroom for machining of the material.

As replied you need to find the cause of the problem. It could be a number of things or combination of
things. Start with basics, be meticulous in what and how you are testing such that you eliminate
factors.

RICH

892
BTW,

I would never run a code that requires "days" to machine something.
Suggest you have a hard  look at  how you are setting up the project in the software such that rough and  finish cuts are
efficiently done to minimize the time.

RICH

893
Is this the first time that you have experienced missed steps when doing 3D machining?
If more than once can you duplicate the fault?
Are the missed steps random or consistant at some section of the gcode.

You need to find what is causing the problem.

The problem could be due to inadequate motor torque for the commanded move at current
acceleration and max velocity setting. 

 RICH

894
General Mach Discussion / Re: Newbie help with Lazycam_ mach3
« on: June 11, 2016, 06:11:21 AM »
Save your AutoCAD drawing as a version 12 dxf. Use the Open DXf tab to open that drawing or File> Open....

There is a manual for Lazycam in Member's Doc's.

RICH

895
Lazycam is an importer of ver 12 dxf files. All entities should be vectors. Not all dxf files are created properly from some programs.
Use a CAD program to create you files. "Etch A Sketch" just doesn't work very well for CAM programs.
That is why you are having problems.

RICH


896
Glad you figured it out.
Attached is a pic of my tool set up screen.

RICH

897
Using the master tool concept, all of the tools are relative to the master tool.
All of the tools should be front or back tool post and never mix back and front.
Now when you touch off the master tool that surface is a baseline / reference for all the other tools.
So if you touch off to the + side of the indicator that side becomes the reference.
Now you can touch off to that same side with an internal tool by extending that reference ....if you can...adapter over the end of the edge finder..... it's a PITA.....
So touch off to the other side of the  edge finder and adjust based on the diameter of the edge finder.

If you first set your master tool X=0 which is the center of the lathe, Zero World axis, and work in Machine Coordinates, you will have the tool offset difference ( need to take into account the edge finder diameter)
on touch off for any tool.

Make sense?

I probe all my lathes tools using a tool setter in the spindle ( could be anywhere ). It's very accurate +- 0.0002 and repeatable.
See attached pic's.

RICH

898
General Mach Discussion / Re: Plasma water table
« on: May 25, 2016, 07:43:36 PM »
So the pan will sit on top of the frame..............wasn't thinking that when just calc'g to what was needed for support of the  the bottom pan plate.
So it is continuously supported around the bottom  perimeter and the other two supports provide for breaking the long side into 3 places , thus you have the
required  two supports already.
Take your pick, 12 or 16 ga thickness. I am not going to totally engineer the thing.

RICH





899
General Mach Discussion / Re: Plasma water table
« on: May 25, 2016, 09:47:32 AM »
Approx total weight of pan and water with 10% added = 525#

So I will assume that the plate gauge used will be 16,12, or 10.
Unit load on the plate will be approx 0.17 #/ sq in

Now it becomes a matter of choice of how the pan is supported.
The pan should be considered fully supported ( assume bolted to upper frame via a pan lip, thus  it's fixed all around.
Using no additional pan supports and 10 GA you'll get a pan deflection of .3" but you can add additional supports ie; put one on the center ( an attached hanger support
running across the bottom of the pan and  up the sides  into the upper frame.
You can also add 2 supports across the width evenly spaced over the length at say 22" spacing and use 12 GA @ .025" deflection or 16 GA with  .16" deflection.

So that gives you an idea of plate thickness with out consideration for corrosion. May want to consider adding a support from legs to center of upper frame.

RICH

900
I don't see anything that says it supports threading which, as Mc replied, is done via the  card / plug in.
You may want to ask the vendor to confirm.

RICH

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