finding center point of circle that doesn't have one

[jonathan joseph]

I'm sure this is a novice question. 

Need to drill a lot of holes from a customer's drawing and they do not have center points to select when using a drilling operation.  Is there a way to find or create them without having to redraw them all? 

Using x8 router. 

Thanks in advance. 

Jonathan 

 

[AHarrison1]

See below thread, might help you out

Oops my bad, missed the part about it being X8.

 

[pullo]

Use Simplify . 

[DUM1]

MASK ON ARC

[jonathan joseph]

Mask on arc doesn't work. I'm not able to select the circles

[JParis]

12 minutes ago, jonathan joseph said:

Mask on arc doesn't work. I'm not able to select the circles

It's because they are splines

[jonathan joseph]

17 minutes ago, JParis said:

It's because they are splines

So then my choices are what? 

[Tim Johnson]

10 minutes ago, jonathan joseph said:

So then my choices are what? 

Read Pullo's posting.

[AHarrison1]

Look for  a button that says 'Simplify Spline' which will convert them to arcs. I think this will only work if it's a closed spline

thus creating a closed arc / circle

[jonathan joseph]

Here is a file with the circle in question. 

 

CIRCLE CENTER PROBLEM.mcx-8

[AHarrison1]

I don't have x8 loaded but when I opened the file and analyzed each element they came as as lines, not splines.

So nothing to simplify there. It looks like you are going to have to draw your own circles.

The easiest way I found was Circle Edge point then 3 Points tangent then pick any of the 3 lines

making the 'circle'

[Ocean Lacky™]

21 minutes ago, jonathan joseph said:

Here is a file with the circle in question. 

 

CIRCLE CENTER PROBLEM.mcx-8

Your 'circle' consists of a bunch of short, line segments.

Place 3 points around the 'circle' and use those with Circle/Edge Point-3 points command.

From there you can come close

[jonathan joseph]

15 minutes ago, Ocean Lacky™ said:

Your 'circle' consists of a bunch of short, line segments.

Place 3 points around the 'circle' and use those with Circle/Edge Point-3 points command.

From there you can come close

That's great! Thanks! Any idea how they generate a crappy circle like that? These are supposed to be serious businesses, I'd assume they have better software than me.....

[Ocean Lacky™]

1 minute ago, jonathan joseph said:

 Any idea how they generate a crappy circle like that? 

Likely just crappy translators

[Colin Gilchrist]

48 minutes ago, jonathan joseph said:

That's great! Thanks! Any idea how they generate a crappy circle like that? These are supposed to be serious businesses, I'd assume they have better software than me.....

What kind of File Format are they giving you? That looks like a bad IGES or DXF Translation.

Ask the company for a copy of the 'Native File', or ask them to export a 'STEP' file.

If you have a solid or surface model, you can generate your own wireframe from those solid/surface edges with the 'Create Curve' command. If the model is a Solid, you won't need to however, as Mastercam will recognize the 'holes' as 'circles', and let you pick the center point.

This is just a result of bad CAD Data translation.

[jonathan joseph]

22 hours ago, Colin Gilchrist said:

What kind of File Format are they giving you? That looks like a bad IGES or DXF Translation.

Ask the company for a copy of the 'Native File', or ask them to export a 'STEP' file.

If you have a solid or surface model, you can generate your own wireframe from those solid/surface edges with the 'Create Curve' command. If the model is a Solid, you won't need to however, as Mastercam will recognize the 'holes' as 'circles', and let you pick the center point.

This is just a result of bad CAD Data translation.

Colin

I receive a dxf from them. Not sure what they originally create them in. I'm pretty primitive and only work in 2-d up to now. 

[Aaron Eberhard]

2 hours ago, jonathan joseph said:

Colin

I receive a dxf from them. Not sure what they originally create them in. I'm pretty primitive and only work in 2-d up to now. 

Some programs have a lot (too many!) options on format export.  I'll bet what you're seeing is something that is set to export DXFs without arcs.

[JParis]

GOGI

"Garbage out, garbage in"

[Flycut]

Wireframe -> Bounding Box -> Center Point?