cnc 3040 and mach3 problems

[JAZZCNC]

Eddy The road runner is not small it's quite large it's just using imperial units and you have tried to cut it with Metric units so appears small.

This will most likely be the problem here.
If you want to use Imperial units then Go to Config menu and Native units and see if it's set to Metric units.?
If so then you'll need to change and restart Mach3.
Then go into Motor tuning and change the steps per. What ever is entered in steps per just multiple by 25.4.

If you just want to see the road runner cut larger but don't want to change the units then just use the Scale Axis feature and type 25.4 in each axis Scale Dro.
You'll find this at the side of the Green DRO box with coordinates in it. Click in it and type 25.4 and push enter, you must push enter or doesn't happen.

WARNING Doing this remember to reset the Scale factor to 1 before cutting other parts or every thing will be sacled 25.4 times.!! . . .Thats why it will flash yellow to warn you.!

To be honest I don't think you have enough room to cut the road runner full size on 3040 so just set the sacle factor to say 5x and that will make it big enough to see cut.

[EddyCurrent]

Eddy The road runner is not small it's quite large it's just using imperial units and you have tried to cut it with Metric units so appears small.

I meant it looked small to the OP

It just shows how naff g-code files are when the units are not specified in a file header, it's a fundamental principle that when 'values' are used they must be given a 'unit' or else they are just meaningless numbers.

e.g. http://articles.latimes.com/1999/oct/01/news/mn-17288

[JAZZCNC]

It just shows how naff g-code files are when the units are not specified in a file header,

They are if you know how to read g-code the G20 says it all. It's always at the top of G-code or in the intial string and Mach displays this on the top bar so there's no excuse really.! . . . . Every one should try and learn a little G-code and Units to be cut in is one of the must's along with offsets and mode codes.

[hoggy]

going to try greasing it and see what happens

[EddyCurrent]

They are if you know how to read g-code the G20 says it all. It's always at the top of G-code or in the intial string and Mach displays this on the top bar so there's no excuse really.! . . . . Every one should try and learn a little G-code and Units to be cut in is one of the must's along with offsets and mode codes.

Yes but I meant in a proper file header, not the code itself, so that Mach3 for example could scale it automatically.

[JAZZCNC]

Yes but I meant in a proper file header, not the code itself, so that Mach3 for example would scale it automatically.

Ok last word from me on this as it's not the OP's problem.!!

Mach won't scale it automaticly because it's native units are set to metric so 1 in G-code equals 1 unit and if thats metric it's 1mm or 1" if imperial.
The G20/21 doesn't change any of mach's settings so the native units are the same. It's mostly to identify the units not set or change them.

[EddyCurrent]

Ok last word from me on this as it's not the OP's problem.!!

Mach won't scale it automaticly because it's native units are set to metric so 1 in G-code equals 1 unit and if thats metric it's 1mm or 1" if imperial.
The G20/21 doesn't change any of mach's settings so the native units are the same. It's mostly to identify the units not set or change them.

You are correct but what I'm saying is, this leads to issues where the machine cuts to the wrong size.