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Messages - Tweakie.CNC

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7341
Spotted the bubble Chris - I am sure you could blob a bit of wax in there and with your skills smooth it off again.

Tweakie.

7342
Why wait until you are big ?.

Tweakie

7343
General Mach Discussion / Re: need help step per unit
« on: May 08, 2009, 12:01:20 PM »
Hi elgammmmal,

Are you working in mm or inches here.

Tweakie.

7344
Another small circuit board - this time it is a simple, two position driver for a bipolar stepper motor.

Tweakie.

7345
Brilliant work there Chris - I agree, you certainly are sharp.  :)

Tweakie.

7346
Thanx for the link - much appreciated.

Tweakie.

7347
Hi Dave,

At the moment I don't have a video camera (spent all my allowance on a Sony SLR and Minolta 70-210 'beercan') but just for you I will try to obtain a cheap webcam that will work with my laptop. Actually you are not missing much, with a feedrate of 20mm per minute It would probably be like watching paint dry. What would be far more interesting is a video of me photographing the laser in action as I tape one lens of the protective goggles to the camera lens filter (to give some degree of protection to my expensive image sensor) then shut one eye and look through the remaining goggle lens to take the shot. Glad no one can see me really  :D
It perhaps should be noted here that viewing a laser through any optical device is a bad idea for your eyesight.

Incidentally these solid state lasers cannot be turned on quickly as they require a 'soft start' in order to meet their expected life span. Therefore, in use, switching them on and off quickly requires a shutter system and I am currently working on this to solve the problem of unwanted burns when the axis is accelerating / decelerating from the start or finish of a line. First attempt at a rotary shutter was not too successful so I either have to improve on it or start again with a sliding shutter idea. I will add to this post when I have more information.

Tweakie.

7348
Thanks RC,

I was thinking of using the Z axis direction signal but this looks like a better way - I must try it and see how it works.

Tweakie.

7349
Hi Hood,

I bought the laser last year and Virtual Village stocks probably change but I am sure it will be back again. (hope so because I want another one).

This Road Runner is approx. 65mm across and laser engraved into aluminium clad plastic engraving laminate. The gloss finish stuff did not work but this matt or brushed surface is just fine. Although the line width is not quite as fine as can be achieved with an engraving point it is not far off. The laser was positioned approx. 60mm off the work and focused to the smallest spot I could get on the surface. There are a couple of dings, top right, which were the focus point and the starting and finishing point. There is also a slight line from the end of the engraving to the home position at the end of the job. I will have to connect a laser enable / disable from the LPT port and perhaps link it to the Z axis function. Does anyone have any ideas about this please ?.


Tweakie.

7350
Hi Dave,

I am only too pleased to share any info I have. All I know about CNC has come from you guys sharing your info.

Another piece of information - When the laser is operated at 2 Volts it produces a faint beam which is ideal for focusing because there is no loom and the beam can be adjusted to the smallest spot then it only lases when the voltage is increased to 5 Volts - pretty similar to the operation of the laser cross hair pointers we use for the tool positioning.

Couple more pics. - The Mach write wizard allows GCode to be created without Z moves which is ideal for experiments - This little laser cuts through 4mm high density foam (the stuff I use to protect RC servos and receivers) too easily, in fact it scored the surface during the fast G00 moves. It also makes short work of pvc electrical tape too.

Tweakie.

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