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Messages - cncbobuk

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General Mach Discussion / Preparation Positioning, (Defaults) Mach 3
« on: July 03, 2020, 04:46:44 AM »
Hi all, long time since I've been here having been very happy with most aspects of my Mach 3 setup for some time. However one thing has started to get to me lately. When initiating a "feed hold" mid job, maybe to adjust work holding clamps etc, then moving the head away from the job to get access, after restarting, the "Peparation Positioning" window pops up. All fine and I understand why that is, but why does it default to not starting the spindle and rapid height to zero, (top of job) first before making X and Y movements? Is there a way I can make it default to say Rapid Height +10 and spindle start? It would save me breaking a few cutters and posibility of scratching the surface of the job. Many thanks for any help, Bob

General Mach Discussion / Re: Cut not going into corners?
« on: January 25, 2018, 11:34:21 AM »
Hi Dave, thanks for that, you are of course right I remember now having this problem before. I'm always a bit reluctant to set acceleration too high as I always think this is a recipe for losing steps however setting "Exact stop" has cured the issue for now. You prompt is much appreciated. I will have a play with acceleration and see what happens. Cheers,

General Mach Discussion / Cut not going into corners?
« on: January 25, 2018, 08:48:23 AM »
Any ideas what I'm doing wrong here? I'm trying to cut a pocket into Plywood, the pocket is 12mm wide and 40mm long with corners radiused at 3.1mm. I'm using a 6mm dia cutter but only one of the corners is actually cut completely, it's like the cutter is anticipating the corner and moving earlier. The G Code was compiled using Sheetcam and looks perfect in simulation so fairly sure the problem is not here but is with Mach 3. Also I'm sure I've done this successfully before. Any ideas? I'm stumped.
Picture here https://www.dropbox.com/s/87xllsubd2i9yo3/2018-01-25%2013.55.15.jpg?dl=0

General Mach Discussion / Re: Setting up a USB MPG (HBO4)
« on: September 20, 2017, 03:46:40 AM »
Hi Rich, Thank you for your reply, I've been into the MPG setup window in ports and pins and tried any number of settings there. It makes no difference even if I enable or disable the MPG there. The result is still the same whatever settings are made. This pendant connects via USB and therefore I presume bypasses the normal Mach3 setup and runs via a .dll in plugins. I'd hoped someone who has used it may know what I'm missing.

General Mach Discussion / Setting up a USB MPG (HBO4)
« on: September 19, 2017, 08:02:52 AM »
Hi all, not been here for a while as my machine has been working perfectly for a good while now. However I've decided to add an MPG to the controller and have bought one of the USB connected HBO4 pendants from ebay where there are any number of these for sale. After plugging it in everything seems to work but when I turn the handwheel the axes move something like 4mm per click. This is of course completely useless, I want to use this to "touch on" the top of the job to set Z=0. I've been through all the setup/config screens and can't see any way to adjust the resolution. Has anyone here successfully set one of these up and could point me in the right direction?

Many thanks, Bob.

General Mach Discussion / Re: Art code 102
« on: August 17, 2016, 07:38:39 AM »
All sorted, simple really I was using the laptop on battery power and the power saving was affecting Mach 3. After plugging it in and setting the power settings to always on everything is fine.

General Mach Discussion / Re: Circles not Circular???
« on: August 12, 2016, 05:29:04 AM »
Many thanks Hood, you were of course right on the money here, the Y axis ball-nut mounting hadn't been tightened up properly during assembly of the machine. I remember leaving it loose so as to ensure it was aligned correctly when putting everything together. I'll have to check everything else for soundness now! Doh!

General Mach Discussion / Re: Circles not Circular???
« on: August 11, 2016, 03:22:15 PM »
Many thanks Hood, I'll give it a good look over in the morning. Cheers

General Mach Discussion / Re: Circles not Circular???
« on: August 11, 2016, 02:51:26 PM »
Looks like backlash issue to me.

Do you mean mechanical backlash? if so I can rule this out completely, both axes have brand new zero backlash ballscrews! If not then can I eliminate it within Mach 3?

General Mach Discussion / Re: Circles not Circular???
« on: August 11, 2016, 01:27:45 PM »
Motor tuning, acceleration too slow.  My initial thoughts when reading your message was scaling active on one axis or another but in that picture it definitely looks like an acceleration setting issue... at least to my limited experience.
Ah that makes sense, I presume that both the X and Y axes should be set to the the same values as both have similar motors and ball-screws (Nema 23 and 16mm x 5mm pitch) Max speed is set to 4500mm/min and motors driven at 2000 ppr. ?

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