Messages

1

General Mach Discussion / Re: UC-100 Motor Stalls. Direction changes. new PC

« on: August 19, 2016, 01:24:52 PM »

jintthefish & Gerry,

i am using the keyboard arrows to jog. Possibly with the faster PC the UC100 it causes the stall to happen; being that it can process the changes sooner. Unlike the slower XP machine. I read where it's not advisable to have comp at 100%. I have also tried varing the comp percentage with no change.  The reason was likelihood to loose steps. Looks like i may just have to dial down the jog speed or just move in one direction at a time. Speed fixes some problems causes others. 

Thanks again

2

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

 

3

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

4

General Mach Discussion / Re: Sherline speeds direction transition

« on: February 24, 2014, 05:03:37 PM »

Fastest1,

Yes i had backlash at 100. I had to do some further searching and didnt realize i was given the answer. My shuttle settings were too high. I adjusted to .0001 and all is smooth.

Thanks for the help gents.

5

General Mach Discussion / Re: Sherline speeds direction transition

« on: February 16, 2014, 12:51:16 AM »

Rich,

Thanks for the info. I did have a motor stall while milling some parts which ruined them. Obviously running too fast. I did take out a lot of backlash mechanically. I'm running with backlash comp off with pretty close tolerance. It's nice to see the smooth transitions with minimal slowing while rocketing along. Job times are much faster.

Is there any benefit in adjusting the Gs?

I have a video of the smooth transitions. Pardon the shaky cam effect.

http://www.youtube.com/watch?v=O-l6XndKqus

6

General Mach Discussion / Re: Sherline speeds direction transition

« on: February 14, 2014, 06:46:16 PM »

Oh Flashcut is a CAM program. I thought it was a machine controller; My error. I use SolidCam.

CV Mode is on. Changed the acceleration to 30 in motor tuning. The mill still slows for the backlash comp. It was faster but not what i was looking for. Take a look at the video below. When the circle is being cut i don't see any noticeable change in velocity as the circle is cut.

http://www.youtube.com/watch?v=itqz-7T-24o

7

General Mach Discussion / Re: Sherline speeds direction transition

« on: February 13, 2014, 07:44:40 PM »

Fastest1,

Router or Mill i don't believe there is much difference in the motion systems. Granted there is belt and rack and pinion. The router in this video is lead screw driven. I looked at his description he is using Mach3 with steppers as opposed to servos and it was the best example i could find. I believe i need to tighten up my backlash up a good bit.

No, Sherlines can be run under number of control software and driver boxes. I have seen Linux based emc2 as well.

Thank you for your input.

8

General Mach Discussion / Re: Sherline speeds direction transition

« on: February 09, 2014, 09:52:20 PM »

Fastest1,

I do run Mach 3 on my sherline. I have looked at the settings for the motor tuning. Am i on the right path? I suppose the next step is to make some adjustments and see what happens.

Thank you,

9

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

10

General Mach Discussion / Making a tooling plate - process help for machining

« on: January 31, 2014, 08:18:56 PM »

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