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Messages - AlexanderJamesGuitars

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1
Hey everyone.

I am looking at getting this Chinese air cooled spindle and VFD from vipwindows_168 on eBay.
http://www.ebay.ca/itm/191590377107?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT&afsrc=1&rmvSB=true

Does anyone have any experience with a Changsheng spindle like this? Has anyone dealt with vipwindows_168?
Any and all information would be greatly appreciated.
Thanks!


2
General Mach Discussion / Re: STEPS PER help - losing my mind
« on: February 11, 2016, 01:47:23 PM »
Have you performed a comprehensive backlash inspection on the axis' ?

Are you approaching the indicator at least 2 moves in the SAME direction ?

I have made sure to minimize the backlash as much as possible.
For instance, the axis starts at -1.0". I run the axis to +0.0", which is against the dial indicator (then I zero my dial indicator). Then I command +1.0" in Mach 3 and see if the axis moved that amount. Which is does, but at a different steps per inch amount than calculated. 

3
General Mach Discussion / STEPS PER help - losing my mind
« on: February 11, 2016, 01:31:02 PM »
Hey everyone.

I need some help with the STEPS PER part of Mach 3. Putting a dial indicator on my CNC movement doesn't really equate to my STEPS PER calculations.
Also, upon cutting 1" squares. My squares seem to turn out 1.0000" Y, and 1.0040" X
Are STEPS PER subject to fine tuning or is the calculations you do, depict exactly what the STEPS PER should be?

Here is the info on my machine:

Techno Isel Model 040 http://www.techno-isel.com/Tic/H830/HTML/H830P046.htm

Leadshine Closed Loop stepper motors and drives http://www.ebay.ca/itm/Leadshine-Closed-Loop-stepper-Drive-motor-HBS507-573HBM20-1000-3PH-2NM-57mm-NEW-/121559936057?hash=item1c4d896c39:g:dxoAAOSwVL1V-OrR

Here is the info I am putting into a Stepper calculator revision 1:

Degree/step - 1.2

Pulse/rev (micro stepping) - 4000

Leadscrew threads/in - 5.08
Thread starts - 1

Steps Per Inch - 20,320



When setting up a dial indicator to the CNC movement of X and Y, 20320 step per doesn't get me to 1". 20335 gets me to 1" right on the money.
Does anyone have any ideas or can point out what I am doing wrong?


4
3. I'd be looking at why your CAM produces so many lines of code. It seems excessive to me. Are you for example converting arcs to lines unnecessarily? Also take another look at the pic I posted, why have the lines suddenly changed from around 3 hundredths to 7 thousandths for no apparant reason?


I create all of my geometry in Mastercam X4 and it also writes the GCODE as well. It seems to put out BOTH the G64 and G8 codes. I don't understand why it is doing this. It is saying; use CV MODE, then turn off CV MODE.

I also have no clue why Mastercam is producing so many lines of code. Could it be that my geometry in Mastercam X4 is fine but my post processor in Mastercam is what is writing the excessive amount of code lines?


5
Hey everyone.

Here is what I have come up with:

Just right now, I noticed every time the toolpath would start up, the CV MODE would turn off and I was originally not noticing this.
The start of my code looked like this:

N100 G17 G20 G90 G40 G80 G64 G49 G0 M05
N102 G8 P1
N104 G90 M5 Z0
N106 G52 X0. Y0. Z0.
N108 G43 H5 Z.25
N110 T5 M6
N112 G0 G90 G54 X7.3898 Y9.0113
N114 S13000 M3
N116 Z.1
N118 G1 Z-1. F50.

ETC...

I then wrote in a G64 (as previously recommended) and noticed this turned on CV MODE.
The NEW code:

N100 G17 G20 G90 G40 G80 G64 G49 G0 M05
N102 G8 P1
N104 G90 M5 Z0
N106 G52 X0. Y0. Z0.
N108 G43 H5 Z.25
N110 T5 M6
N112 G64 G0 G90 G54 X7.3898 Y9.0113
N114 S13000 M3
N116 Z.1
N118 G1 Z-1. F50.

Here is what happened:

Almost all of the shuddering went away, and I started having a smooth, curve like motion come out of the CNC toolpath. The toolpath was running A LOT better. There is only a small amount of shuddering of very rapid small moves from front to back (backlash?), but it is barely noticeable.

I timed the toolpath for efficiency:
200 lines lookahead

At 3mins 48 secs, CV MODE on, 9890/9890 lines finished
At 3mins 48 secs, EXACT STOP on, 2366/9890 lines finished (very shuddering and jerky motion)




Now this seems to have solved my issue but I am left with a couple questions:

1. What should I have turned on in relation to CV MODE (other than CV MODE)?
2. Do I need 4000 pulse/rev for microstepping or is there a better amount to use to optimize my system?
3. Is there any other things (settings, etc) you folks can think of to help make my system run smoother?
4. Why does my GCODE turn off CV MODE?
5. Should I always have CV MODE on?
6. How can I program Mastercam to always input a G64 into my GCODE?


6
Hey everyone.

So, this is all a lot for me to take in because I would not consider myself professional at CNC but here is what I have gathered.

1. Try halving my micro stepping and see if it produces a smoother result
2. Play with reducing velocity and acceleration to produce a smoother result



I also wanted to try to give more back story. The shuddering during this toolpath is definitely repeatable, it is not random.
When really trying to hear and see the shudder, I have been running the CNC dry (just running the toolpath in the air, not cutting anything).
I used to have 125 oz in. steppers on the machine and I do remember the shuddering while running this toolpath then.
The closed loop steppers (linked to in a previous post by me) are new and this is my first time running them through movement tests.


I will try 1 and 2 up there ^ but please let me know if you have any other possible solutions or you need any more information from me.

8
I am using an Ethernet Smooth Stepper.
My drives are microstepping at 1/13 (I think that is how you write it), or 4000 pulse/rev

I have uploaded my XML.
Here is a sample of the guitar neck volute toolpath that I get a lot of shuddering on:

N100 G17 G20 G90 G40 G80 G64 G49 G0 M05
N102 G8 P1
N104 G90 M5 Z0
N106 G52 X0. Y0. Z0.
N108 G43 H5 Z.25
N110 T5 M6
N112 G0 G90 G54 X7.3898 Y9.0113
N114 S13000 M3
N116 Z.1
N118 G1 Z-1. F50.
N120 X7.4171 Y9.0341 F100.
N122 X7.4443 Y9.0571
N124 X7.4713 Y9.0801
N126 X7.4981 Y9.1031
N128 X7.5249 Y9.1261
N130 X7.5515 Y9.1489
N132 X7.5781 Y9.1715
N134 X7.6047 Y9.1939
N136 X7.6312 Y9.2159
N138 X7.6577 Y9.2375
N140 X7.6842 Y9.2586
N142 X7.7108 Y9.2793
N144 X7.7373 Y9.2993
N146 X7.7638 Y9.3188
N148 X7.7903 Y9.3375
N150 X7.8168 Y9.3556
N152 X7.8434 Y9.3729
N154 X7.8699 Y9.3894
N156 X7.8964 Y9.405
N158 X7.9228 Y9.4198
N160 X7.9492 Y9.4336
N162 X7.9756 Y9.4465
N164 X8.0019 Y9.4585
N166 X8.0282 Y9.4696
N168 X8.0544 Y9.4797
N170 X8.0806 Y9.4888
N172 X8.1068 Y9.4971
N174 X8.133 Y9.5044
N176 X8.1593 Y9.5108
N178 X8.1858 Y9.5162
N180 X8.2125 Y9.5209
N182 X8.2396 Y9.5246
N184 X8.2671 Y9.5274
N186 X8.2953 Y9.5294
N188 X8.3241 Y9.5304
N190 X8.3313
N192 X8.3387 Y9.5303
N194 X8.3463 Y9.5302
N196 X8.3542 Y9.5301
N198 X8.3624 Y9.5299
N200 X8.3707 Y9.5297
N202 X8.3793 Y9.5294
N204 X8.3881 Y9.529
N206 X8.397 Y9.5286
N208 X8.4062 Y9.5282
N210 X8.4156 Y9.5278
N212 X8.4252 Y9.5272
N214 X8.435 Y9.5267
N216 X8.4449 Y9.5261
N218 X8.4551 Y9.5255
N220 X8.4654 Y9.5249
N222 X8.4758 Y9.5243
N224 X8.4865 Y9.5236
N226 X8.4973 Y9.523
N228 X8.5082 Y9.5223
N230 X8.5193 Y9.5216

9
Hey everyone.

I have some toolpaths where I cut out a guitar neck. While doing any straight cuts, my CNC router runs great. When I get into doing the heel or volute carve on the guitar neck, the CNC is going through A LOT of little code to make the moves and it can start to shudder / jitter pretty bad. It shakes the whole CNC.

I am running those paths at 50 IPM but Mach 3 only says it makes it to 10-15 IPM for all those lines.

I don't know anything about CV mode but could it be that? Or would it be my post processor for Mastercam X4?


Any help would be greatly appreciated.
Thanks.

10
Hey everyone.

I just bought a set of Leadshine closed loop stepper motors and drives. I am going to install them on my old Techno Isel 027 CNC.
http://www.ebay.ca/itm/2NM-Nema23-Leadshine-Closed-loop-stepping-motor-drive-kit-HBS507-573HBM20-1000-/191574934333?hash=item2c9ac1833d:g:DZYAAOSw9N1VuGzl

The original Techno Z axis stepper motor had a Lenze brake on it. I figure I am going to need a brake for my new Z axis closed loop stepper motor.
I am very new to brakes and know little about them. I take it I will need a NEMA 23 mounted brake to go with my closed loop stepper motor.

Can anyone direct me to a manufacturer that would fit my needs? I expect to pay around $200. Is there anything available in Canada? What holding torque would I need?
I can't find any of them on eBay.

I really appreciate any help the community can give.
Thank you.

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