Messages

2221

General Mach Discussion / Re: 3D Printer - OD vs ID Measurement

« on: September 20, 2015, 03:59:03 AM »

You don't really, the adjustment on 3d print is normally a function of the extrusion amount - too much extrude will make things bigger externally and smaller internally.

I use Slic3r for my 3d code generation and it has adjustments for the extrude width etc and must be calibrated every time a new roll of filament is added as they are all different and thicker filament=more extrude, naturally if you have a granule feeder then this will not apply.

Mach just does what the code tells it

2222

General Mach Discussion / Re: Ref All Home

« on: September 20, 2015, 03:12:40 AM »

I think you need to edit the ref-all button code and change the X ref to refcombination( 10 ) possibly. Thats what my machine uses and i have X slaved with A.

I have a home/limit switch on X and A

2223

General Mach Discussion / Re: Stop CV issues...

« on: September 16, 2015, 02:23:28 AM »

Dave it is NOT an issue with the PM45 it is a  Machine design issue. You accel is too slow . Have you tried raising the acell rate until you get skipping of steps  then back it up untill it stops skippinging steps.  THAT is the only way to know the upper limit of the setting.

AND it that is still not enougt THEN you redesign the drives/motors /power supply to a better combination that WILL let you get to where you need to be.

Not sure i ever hinted it was an issue with the PM45??  I will retune the drives as soon as i can, this is a pretty small issue really, i know plasma can never cut a square corner and i have seen some samples of others work which shows i am not that far away from a typical cut.

I will push it to the limit though just to find the limit

2224

General Mach Discussion / Re: Stop CV issues...

« on: September 14, 2015, 06:23:13 AM »

Ohh, nice, found a bug

Ok thanks for the fix, very useful.


Dave

2225

General Mach Discussion / Re: Stop CV issues...

« on: September 14, 2015, 02:23:20 AM »

Hi

can't remember which version, its at home, will check tonight but i do know that the CandCNC plugins and THC only works with one version of Mach.

Yes i can leave it on of course.

The main issue is i think that i done even know what a PM45 is capable of when it comes to internal corner quality, i know it can't be tighter than the radius of the flame but its difficult to know when you can't see what other users are happy with I may be chasing the impossible.

Anyway, thanks all for the info, I will leave CV on as normal and revisit my table settings etc.

2226

General Mach Discussion / Re: Stop CV issues...

« on: September 13, 2015, 04:42:57 PM »

I've only cut this one part, using it as a test to check the slot width etc. The whole lot are drawn just as badly though.

No, with CV back on the blips disappear.

This is the LPT version, the THC is a CandCNC Mp3000 DTHC2, not tried this part with THC off yet or reversed directions.

I've attached the whole file incase someone wants a play.

2227

General Mach Discussion / Re: Stop CV issues...

« on: September 13, 2015, 04:13:10 PM »

Hmm, ok here we go

That file is not my general standard, it's downloaded from the 'net and yes it's pretty ugly when loaded in CAD, thousands of little lines. However, with normal CV on, it cuts perfectly fine - no issues at all, its only when stop-cv is on that the blips show up and there is one every point where it goes form straight to a curve - no slowdown so should not blip.

It's a minor point and i was just playing about looking for improvements.

Yes, I have not fine-tuned the THC yet, it could well be diving unseen, I will have a play with the dive% settings.

So far I only have the 45A consumables for my PM45, I will be getting some 30A ones to try though. The air is passed through a refrigerated dryer so should be pretty good.

Any chance of a pic or two of some examples of your cuts for comparison, some settings maybe

2228

General Mach Discussion / Re: Stop CV issues...

« on: September 13, 2015, 10:36:36 AM »

take a look at line N0360 and N0490 and tell me what you see.

N0360 G01 X8.171 Y25.365
N0490 X33.009 Y48.108

G01 is missing?

Thats all i can see, i'm way down the learning chain though...

2229

General Mach Discussion / Re: Stop CV issues...

« on: September 13, 2015, 09:16:24 AM »

Ok, g-code and a picture attached.

You can clearly see the hiccup in the cut on the last two parts in the picture, the only difference was turning stop-cv on angles>89 deg on for these two.

The reason for wanting the exact-stop is because there is a 3mm slot in the parts which i wanted as square as possible.

2230

General Mach Discussion / Re: Stop CV issues...

« on: September 13, 2015, 07:39:27 AM »

Yes the line joins as you say - no angle.

Yes, It's pointless using stop cv on that part BUT lets say the part has internal corners AND arcs etc, the corners are improved BUT the arcs are degraded by the blip.