Messages

1

General Mach Discussion / Re: Cutting under or over size depending on software

« on: July 23, 2020, 12:26:46 PM »

Yes, probably a good idea. I'm currently at the 'can the machine work properly' stage using software to drive it rather than coding.
Paul.

2

General Mach Discussion / Re: Cutting under or over size depending on software

« on: July 23, 2020, 09:54:48 AM »

I haven't but I'm not that clued up on G-code. I'll have a look to see if they look similar.
Paul.

3

General Mach Discussion / Re: Cutting under or over size depending on software

« on: July 03, 2020, 04:41:47 AM »

Thanks. Any idea why two separate pieces of software have different errors?
Paul.

4

General Mach Discussion / Cutting under or over size depending on software

« on: July 02, 2020, 02:34:03 PM »

Hi, I've got a small mill with Mach3 on it (Warco WM16 - Cast iron, weights about 200KG). I've set it all up and if I measure the movement with verniers (with the head pushing them) I'm within 0.02mm which is not fantastic but is OK. If I use the newfangled wizards for pockets, either round or square, they come out under size, sometimes as much as 0.1mm. If I user dolphincam to generate g-code to cut the same shape it comes out slightly oversize, by around 0.05 to 0.1. This is cutting plastic so fairly soft, so I don't think it's flex. If it was, I'd expect it to be the same. Any ideas?

Also, What are typical tolerances for Mach3 and 1605 ball screws? I'm using 1600 steps per rev and NEMA23s. Not sure if that's a good value of not, but gives reasonable speed and should technically get me 0.00312 per step. Any advice welcomed on how to get it better.

thanks Paul.