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Topics - Craig1

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1
General Mach Discussion / UC-100 Motor Stalls. Direction changes. new PC
« on: August 15, 2016, 08:40:07 PM »
Hello,

Symptom / example: When jogging on more than one axis followed by a direction change. Travel in X+ Y+ then switch to travel Y- an axis will stall. This is at 100% jog rate. Motors set to 20 IPM acceleration has been set from anywhere from 1.5-20 IPM with the same result. Now if i turn down the jog percentage to 50% the problem is no longer present. Now i did observe when i jog at the low rate i see M3 take out the backlash. It does not stall. It also doesn't seem to stall while under control of g-code. It did stall under g-code but was resolved after some tweeking.

I have done a fair amount of searching with out an answer as of yet. My gut says its a setting i'm overlooking.

Granted i have changed fair amount at once. Any thoughts & advise would be helpful.
I'll keep looking in the mean time.

XML attached

New pc:
dell optiplex 790 3ghz 8gig ram.
UC-100
sherline stepper controller.

Thank you,
Craig

 

2
G-Code, CAD, and CAM discussions / Modifying facing code
« on: April 14, 2014, 09:25:45 PM »
Hello,

A nice piece of variable facing code was written by someone for leveling stock. The code works on the upper surface. What I'd like to know is it possible to adjust the code to work on a vertical surface? The reason why i ask is i also have a metal metal foundry in which i melt down aluminum pour in blocks. The blocks need to be cleaned up prior to milling. Due to the size of the block and my bench top mill i can't fit them on edge.

My thoughts on the 2 types of movement could be done.

1) Set the tool at the top of the part. The code would move down a specified amount the traverse + X reach the end Z down the - X repeat cycle.


2) The tool would be at the bottom of the part. + y increment  Cut + X across vertical face + Y increment cut - X back to zero repeat.

The host code is attached. Any thoughts are appreciated.

(CUTS Top Face of stock)
    (STARTED AT Z0 TOP OF rough PART)

    M03 (start spindle)
    G1G90X0Y0Z0.25F60. (Go to lower left corner of stock)
    Z0 ( Feed to face of rough stock)

    (load variables)
    #1000=[2](Length in X in this case inches ******* correct)
    #1001=[2] (Width in Y ******* correct)
    #1002=[-0.1] (depth each of cut pass)

    #1004=0 (i beleive this should be value i in put NO, leave it at ZERO)
    #1005=0.2 (offset cut distance smaller than .75 cutter diameter)
    #1006=[#1005*2] (Compute step over)
    #1007=[#1001/#1006] (Compute passes)

    M98 P5 L8 (call subroutine CUT DOWN IN Z in this case 0.1 * 8 = .8")
    M05 (stop spindle)
    G0G90Z.25 (move back up)
    X0Y0 (go home)
    M30 (All done)

O5
    M98 P10 L1 (call sub to feed down)
    M98 P20 L1 (call sub to face part)
    G0G90Z0 (Move out of the way)
    X0Y0 (Go Home)
    M99

O10
    #1004=[#1004+#1002] (Calculate New cut depth)
    G1Z[#1004] (MOVE TO CUT DEPTH)
    M99

O20
    M98 P30 L[#1007] (call sub to cut reps ACROSS)
    M99

O30
    (THIS IS THE SUB TO CUT FACE)
    G1 G91Y[#1005] (Increment over in Y)
    G90X[#1000]F80. (Cut across part)
    G91Y[#1005] (again increment over)
    G90X0 (Cut back across part)
    M99

3
General Mach Discussion / Sherline speeds direction transition
« on: February 09, 2014, 09:21:56 PM »
Hello,

I'd like to figure out how to increase the speed on my mill. The purpose is to decrease job times. I'm using the stock steppers and control box from Sherline. I have success with increasing IPM in the CAM software as well as using the feed rate override. I still see a slow down in direction change.

Would i make adjustments in the motor tuning screen?
Increase backlash rate?
Is it possible?

I have included a video i have found on you tube by Neo7cnc. I have asked him about his setup with no reply. Any thoughts you have are appreciated. I have looked at his posted specs. From what i can tell he i using steppers.

http://www.youtube.com/watch?v=7jY-_rR4Yg4&list=PLFc8_pNqVayKjZOWfq7PzxyowhobPZPae&feature=c4-overview-vl

4
Hello,

I'm ordering a piece of MIC-6 to make a tooling plate for my Sherline 2000 mill. I have the A2Z CNC X & Y upgrades so the dimensions will be 1/2 X 6 X 17.  I'd like verify may process or hopefully get some input.

1) Square and secure the plate spaced off the table. The spacing is so the drilling op will not go into the table.

2) Drill the clearance hole for the hold down crews.

3) Mill pockets for hold down screws so the heads sit below the surface.

**** At this point I have some options ****

4A) Drill the tap holes for plate.

5A) Engrave an alignment grid

6A)  Square the edges of the plate.

*******************

4B) Stop, re-secure the plate to the mill table using the new mounting holes. I would still have it spaced off the table to protect it as before.

5B) Drill operation for the tap holes.

6B) Engrave an alignment grid

7B) Square the edges.

I like the B option better.  I think the tap hole drilling and engraving will be done more accurately.

Thanks,
Craig

5
General Mach Discussion / keyboard loss functionality
« on: January 28, 2014, 11:19:41 PM »
Hello,

I have lost the functionality of page up/down left right up & down arrow they as relate to X Y and Z. This occurred after i was trying different screen sets  looking for a one with an inner diameter zeroing function. The on screen MPG works with axis movement. As a test i installed mach 3 again in another folder. All axis worked fine with the keyboard commands in the newly installed version. Program relaunched and system rebooted. No change. My thought is a file may have been corrupted. I rather fix the problem to avoid running through the set up process.

Would using one of the XML back up files resolve the issue, other suggestions?

Thanks.
Craig

6
General Mach Discussion / Z Axis issue with RUN FROM HERE
« on: December 24, 2013, 03:57:08 PM »
Hello,

I have noticed a problem after I use run from here. I was making an Acrylic tooling plate. The program was stopped to clear the tap drill from melted chips. Then when I went to use Run From Here I received the message stating preparing to move (normal). The Z then starts to raise. I assume this is to clear my .4" clearance or got to the 1" tool start height set by the CAM. The Z will raise to the point of the running out of travel.

I'm using a drill chuck and standard length drill bit which makes the head stock much higher then with other tools. I don't have this problem with shorter tools. I would guess that there is an option or value on how far to Z up.

Any thoughts?

XML attached.

Thank you and Merry Christmas.


7
I have made the code in solid cam. It is a pattern of circles tobe cut first then cut out the main shape from the material. Any thoughts?


8
General Mach Discussion / First G code to actual part
« on: May 14, 2011, 12:29:41 AM »
So things went pretty well. I still have plenty to learn. This was a good start though. The part was orientated in mach facing the other direction so I need to flip the axis. Also locating the block better would help. Eye balling isn't so accurate. 

9
General Mach Discussion / Tool plate/setter wiring.
« on: May 08, 2011, 02:35:02 AM »
I am planing on using the simple PCB board style setter. How do you physically wire the input? I have a Sherline controler which has tamper seals. Do i have to wire through box or can it be wired anothe way?

If you know of another post that i should i would appriciate it.

Thanks you.

10
General Mach Discussion / Which end mills to have on hand????
« on: May 03, 2011, 08:22:57 PM »
    This is rather general; But what end mills should I have for most applications? I have a standard assortment which came with my Sherline. I also have 3/8 x1-1/2 long and some very tiny end mills form harbour freight. Very cheap but worth a try for 6 bucks. What sizes of ball mills, engravers and specialty bits? Granted each users preferences will differ but a general idea would help me pick a fair assortment.

Thanks.
Craig

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