Help! > Hints, Tips & Tricks

Using the ARC function on a DRO

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mcostello:
We still appreciate the effort. :ThumbsUp:

Sanjay F:

--- Quote from: springcrocus on September 28, 2025, 01:40:25 PM ---Well, what with Sanjay preferring YouTube and Jason effectively trashing my work, I think I will give it a miss in future. I'm obviously not very good art this lark.
Regards, Steve

--- End quote ---

Sorry Steve, I didn't mean to say that your efforts were wasted, as a beginner I have found it easy to have a old laptop in the workshop and step through following Youtube videos. Keep up the good work, I NEED INSTRUCTIONS  ;D

Don1966:
I put in the plans and drawings years ago a coordinate calculation sheet for those who don’t have DRO capability. You can find it here check through the thread to find the latest revision of it.   https://www.modelenginemaker.com/index.php/topic,6004.msg118631.html#msg118631
I hope this helps some of the novices!

Regards Don

Jasonb:
Steve, my reply was as much to Sanjay as it was to you.

In my opinion for stitch drilling as you show then the PCD function is simpler, will do any angle of arc and being a function that most use a lot more often does not need reference back to poor instruction books.

If you had been wanting a far smoother finish to the semicircle then the ARC function can be a better option as it will work out the ofset from the edge depending if you want to cut inside like you show or outside to leave the semicircle. These are typicaly used to round over corners or cut a cove/scotia. on the X-Y plane.

The usual way to set it up is to enter the radius of the arc in this case 31.5 not the ctr line and then when you enter the tool diameter the software will take that into account and plot the points so that the tool is inside or outside that 31.5mm radius by half it's diameter depending on what you select.

When it comes to rounding on the X-Z or Y-Z planes then that is where the eight options come into it more, but even when doing in X-Y the direction of travel can affect the finish as one is less likely to see the tool being pulled into the work. The eight buttons show the vertical milling cutter and that is when they come into play when the cutter is vertical up against the arc like the example I showed.

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