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Messages - mrehmus

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Inspiration / More nice ideas
« on: November 07, 2017, 06:42:43 PM »

T2 Engraving / Re: How did this happen, clear spots engraved.
« on: November 04, 2017, 10:01:34 AM »
If you have a choice, never open and resave a JPEG. The compression algorithm actually destroys some of the image content. That's why you get those commas around picture features after a couple of opens and saves. Copying a JPEG does not destroy any more image information.

What I do is immediately save the JPEG in a non-destructive compression file format (or none at all which I prefer). Since I have photoshop, I tend to use that format although .BIP and .TIFF work well too. If I need JPEG for the final format, I then save in that format after all the manipulation is finished. Save at maximum quality if that option is available.

Engraving / Re: Repairs needed locally
« on: October 11, 2017, 02:56:43 AM »
Here is an example of a paid service that works well. I've used services like these and found the cost and the answers acceptable.

General Discussion / Re: Low pwer with 1.1f
« on: October 11, 2017, 02:53:54 AM »
Could be you need to set the value to 1000?

Engraving / Re: Problems with greyscale
« on: October 09, 2017, 07:15:29 AM »
Power supply?

Engraving / Re: Problems with greyscale
« on: October 08, 2017, 04:34:52 PM »
Any chance the speed is too great?

Here is a thought:
Tape something thin and flexible, like 6-8" long bristles from a broom so they stick out in both the X and Y directions. Now load up some X & Y motion code at your normal burning speed. Make the motion in only one direction at a time. If the outboard bristle ends don't wobble, then try taping one to the lens and repeat the motion with the bristle sticking out in line with the motion. If it wobbles then, you've found the problem. My laser lens has an o-ring around it in the area of the threads to compensate for a really sloppy fit in the heat sink. Yours may be missing the o-ring.

If the bristles wobble in the first test, then move them to the crossbeam and retest.
This way you can find the source of the errant motion.
Another way would be to use a dial indicator but most people don't have one of those at hand.

General Discussion / Re: Could an A3 machine become a 3D Printer?
« on: September 30, 2017, 07:27:16 AM »
Pretty much most of the frame, carriages, wheels, etc. The plexiglass sheets used for the carriages have no stiffeners, etc. They are flexible fliers when you move the bits at the speed of a normal 3D printer. Of course, they really don't have the electronics to move a print head at speed in any case let alone the power supply capacity to heat a nozzle, heat a bed and run several fans.

3D printers, the best ones, are framed with steel and at least cast aluminum joints if not steel-to-steel connections, have stiff dual steel rods for slide rails with bearings that have no slop. Those 3D printers that use plastic joints always have some slop in the frame. It shows in the prints.

Here is a print from my Qidi X-one printer. All steel frame, no flex. The Unicorn is printed in PETG.

General Discussion / Re: Could an A3 machine become a 3D Printer?
« on: September 29, 2017, 09:21:23 PM »
I think you would be happier if you started with a 3D printer and put a laser on the head. You'd get a much more rigid mechanism than these laser engravers offer. The non-stable frame of a laser engraver means your prints will not be very good at normal 3D print speeds or you will be spending days to print something halfway decent.

Repair & Testing Services / Re: Replacing mosfet
« on: September 27, 2017, 08:53:06 PM »
Thank you 8)

Repair & Testing Services / Re: Replacing mosfet
« on: September 27, 2017, 05:34:14 PM »
I always feel guilty when I have an active component with a tab and don't put a heat sink on it for insurance.

It would be good if you would post the ID of the replacement MOSFET.

Projects / Re: My Rotary Axis
« on: September 27, 2017, 12:11:02 PM »
You can use the laser to warm the beverage and then mark the bottle. Why waste time?

Cutting / Re: Laser doesn't cut evenly
« on: September 26, 2017, 06:24:39 PM »
Might check the power supply voltage to see if it is varying. I think the supply they provide is marginal for the 2.5 Watt head. I plan to move to an old computer power supply one of these days.

Projects / Re: My Rotary Axis
« on: September 26, 2017, 06:22:28 PM »
What, no hot mulled wine or cider? :'(

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