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361  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Just got a lathe to retrofit on: February 25, 2012, 02:02:29 AM
Id like to scale this down but need an alternative to the curvic as I don't see them offered in a smaller size.
Maybe pins and bushings ?  Or keys and slots ?

Russ,

You need them tapered for it to work at all. Otherwise a small lash and vibrations are inevitable. If you have an accurate enough CNC mill I think it wouldn't be a problem making one. If your mill isn't accurate you should still get around if you have a rotary table which would index one tooth at a time and the mill would cut each tooth at the same location, thus repeatability is guaranteed.

Dan
362  G-Code, CAD, and CAM / G-Code, CAD, and CAM discussions / Re: Arcs not cutting smoothly on: February 24, 2012, 02:08:01 AM
It's different in this case, I am afraid, as he has arcs programmed in the Gcode and not segments.

Dan
363  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 22, 2012, 08:00:05 AM
Sorry, Tweakie. Didn't mean to sound that way. Let's just consider the issue closed... till we know better anyway Wink

Dan
364  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 22, 2012, 05:55:26 AM
Hi Tweakie,

I agree again. I was just trying to say it was not theoretically correct a way of description. There will always be the slightest offset between the two dots. It might be small, but it's there. And without it you wouldn't again be able to produce shades of grey Grin

Dan
365  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 22, 2012, 04:45:54 AM
Hi Tweakie,

I agree with this. It's just that I think that using the word "power" to describe this process is misleading as the laser is being turned on to the same (predefined by some other means) power each time.

And to be more correct, I think that the laser never really does several pulses on top of one another (well if it's focused fine enough that is), as the axis is in a constant move. I think the correct way of thinking about it is the dots intensity. And the other thing to consider while at it is that the exposure time is determined by the axis feed rate.

Yes, I had read through your PDF and I must say you've done great job there!! Thanks for that!

Dan
366  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 20, 2012, 01:09:39 PM
Well, I think the plugin doesn't control the laser power whatsoever. All it does is trigger it on and off.

Dan
367  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 20, 2012, 12:43:59 PM
On it's own, the plugin will not always smooth a gradient of tone without producing 'steps' as can be seen in the background of this image which is a smooth transition from light to dark.

Tweakie, just out of curiosity I would try engraving the same image rotated by 90.

John, I think the plugin outputs equal length pulses for each pixel. As far as I understand it's the spacing which creates the toning.

Dan

EDIT: Found original Art's description:

http://groups.yahoo.com/group/mach1mach2cnc/message/74912

368  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 20, 2012, 11:52:36 AM
Hi Tweakie,

So how does it vary from the Impact plugin which still fires the laser at the same power each time? Roughly speaking, if I understand correctly the way the plugin works, it does internally the same thing as that program does, but following a different algorithm.

Dan
369  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: February 20, 2012, 09:20:27 AM
Can you explain please, Tweakie? The power supply still operates in digital mode so how does the image conversion help?

In the image the program outputs, are all the dots equal in size?

Dan

370  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Just got a lathe to retrofit on: February 19, 2012, 05:59:01 AM
Yes, using the bolts against the turret would damage it.

You're lucky to have clean air Smiley

Dan
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