Messages

731

LazyTurn / Re: Inscribed circle, what am I missing?

« on: December 04, 2010, 01:02:44 AM »

Hi Rich,

Thanks for finding this. Can't take the credit for this, as Jim is the one who found this

As to the tool inserts, the world standard to define the dimensions of inserts is by using the inscribed circle, (except for parallelogram shaped inserts). It is coded in the number of eights of an inch. It is usually a sequence of three numbers along with insert thickness and tip radius. In metric system the insert is defined by the cutting length in mm along with thickness and tip radius. Machinery's Handbook has a good description of the American standard.

Dan

732

VB and the development of wizards / Re: key cutting

« on: December 04, 2010, 12:41:10 AM »

The only trick is you need to work out the code of the key.

And how is that done?

Dan

733

Show"N"Tell ( What you have made with your CNC machine.) / Re: RC Gyrocopter

« on: December 03, 2010, 08:28:51 AM »

Like it! Is it your own design?

Dan

734

VB and the development of wizards / Re: key cutting

« on: December 03, 2010, 01:57:07 AM »

Hi AR,

So how does it work if I needed to make a key to match an existing one? I can see no point in being able to produce a new key if you don't have a matching lock for it.

Dan

735

LazyTurn / Re: Inscribed circle, what am I missing?

« on: December 03, 2010, 01:46:33 AM »

Hi Rich,

I don't think I understand your point about insert tolerances. Define it whatever you define in LT, in the end it all comes down to touching off the bar and measuring the diameter. Furthermore, for discussion purpose, the insert tolerances are much better than what you mentioned. It is in the range of 0.01mm (0.0004") for the critical dimensions.

Dan

736

General Mach Discussion / Re: What would make the size of holes change during cutting????

« on: December 02, 2010, 09:35:57 AM »

Hi Lulu,

It does the same thing no matter where you place the work on the table...? Can you post the Gcode?

Dan

737

VB and the development of wizards / Re: key cutting

« on: December 02, 2010, 09:34:05 AM »

Hi Ar,

Very interesting! Nice application. Thank for sharing!

What is it mostly used for - reproduction of existing keys or producing new ones?

Dan

738

LazyTurn / Re: Inscribed circle, what am I missing?

« on: December 02, 2010, 09:19:01 AM »

Hi Jim,

Tool inserts are defined by the inscribed circle. i.e. the circle inside the insert and tangent to all its sides. From your description I think you were defining a circumscribing circle.

Dan

739

Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS

« on: November 30, 2010, 03:35:15 PM »

Sorry Wes, it was my bad about the Z values. They are fine.

It looks like in diameter mode the K word should be half the radius. See the code I posted in reply #23. Here are the last few lines:

(Finish Passes)
G1 X15 F0.05
G3 X15 Z-25 K-5
G0 Z-15
(Spring Pass)
G1 X15 F0.05
G3 X15 Z-25 K-5
G0 X16.5
G0 Z0.5
M5
M30

When is diameter mode, the last G3 move takes the cutter to the extreme X5, while the X end is defined as 10. Sorry for being unable to explain it better. Hope you follow me. Just change between the modes and run the code. You will see where the DROs go. Also load the OD Arc3 wizard and see how the arc movements are affected by changing the mode. I didn't try to understand the math behind it, but for some reason, in diameter mode the 'I' word adds up. In radius mode it's zero.

Dan

740

Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS

« on: November 30, 2010, 09:57:32 AM »

Hi Wes,

Had a chance to cut some material today. The wizard doesn't work when in Diameter mode. The cutter plunged deep into the stock. Changed to Radius mode and changed the X values in the wizard accordingly and it worked fine.

The Z start and end are still swapped.

Dan