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Messages - Tweakie.CNC

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8261
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: April 30, 2010, 12:58:32 PM »
I had boiled eggs for breakfast this morning and while I was dunkin my soldiers I thought " I wonder if..... ".
The answer is yes you can.  ;D ;D ;D

Tweakie.

8262
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: April 28, 2010, 10:27:10 AM »
Hi Dan,

Thanks for the suggestions / ideas - anything and everything is appreciated. I have just so much learning to do here.

Tweakie.

8263
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: April 28, 2010, 08:10:17 AM »
Hi Dan,

Yes it does have a draft angle because the beam converges from the lens to the exact focal point whereupon it diverges again. I am currently looking at ways to improve this situation either by using a lens with a greater useful focal length or multi-pass cutting at reduced power with Z movement resetting the focal distance on each pass.

The edge finish is not perfect with some vertical styrations similar to a bandsaw cut but at least it is polished and so looks acceptable - I need more practice and experience here !.

The picture was taken with flash and the acrylic is on a sheet of brushed alluminium - Quite a nice effect I thought !.

I will post some more pictures when the camera battery has been recharged.

Tweakie.

8264
Show"N"Tell ( Your Machines) / Re: The Laser Project.
« on: April 28, 2010, 06:52:41 AM »
By way of an update on this project:-

The DRO struggled to display the tube current a low power settings and has been replaced by a retro moving coil panel meter straight out of the 1960's. A new scale was engraved with the laser and a suitable shunt fitted to calibrate the meter.

   

This is my first attempt with cutting acrylic. The red is 2mm and the clear is 6mm thick.

   

Tweakie.

8265
Great work Rich.
How did you make the targets please ?.

Tweakie.

8266
Share Your GCode / Re: He's just a Wile and crazy guy!
« on: April 26, 2010, 04:28:27 AM »
Hi Sam,

I export as HPGL (which is where the arcs become the many straight lines) then convert this to the GCode with a simple converter program.

Tweakie.

8267
General Mach Discussion / Re: Any Microscribe users in here?
« on: April 26, 2010, 01:54:16 AM »
Seems that Rhino is looking at a different file or getting it's data from the registry settings perhaps.

Tweakie.

8268
Share Your GCode / Re: He's just a Wile and crazy guy!
« on: April 26, 2010, 01:50:24 AM »
Thanks for the information Sam.

I am still in the dark ages using Adobe Illustrator and Acme Trace Art or TurboCad.

Tweakie.


8269
Share Your GCode / Re: He's just a Wile and crazy guy!
« on: April 25, 2010, 01:31:30 PM »
Hi Sam,

How did you produce the code for Wile.E.Coyote please ?.

It does truly run at a constant velocity on my machine - unlike some of the code I make, which has so many straight lines instead or arcs, that it slows down considerably.

This was never a problem with conventional engraving but is a real headache with laser engraving which relates speed and depth.

Tweakie.

8270
Hi Bill,

This problem was discovered by engravers, many years ago.
The trouble is that the very tip (magnified) of a standard vee tool has no cutting edge therefor a great deal of friction is present which, with stuff like HDPE results in melting and subsequent poor finish. If you study the geometry of an engraving point, you will see that it has a flat on the point (only about 0.004" wide) and this flat has clearance which makes it into a cutting edge and therefore reduces friction.
Exactly where one can be purchased I don't know but there must be 'purpose made vee tools' which are made especially for plastics which probably look just like the standard engraving points.

Tweakie.

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