Author Topic: Pproblem with a stamp  (Read 1338 times)

mauriceman

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Re: Pproblem with a stamp
« Reply #15 on: February 05, 2018, 07:34:17 AM »
For all my engraving, I do all the image prep work in either Photoshop or Inkscape. I really don't use any of the "image tweaking" functions in T2LASER. Sorry.

So basically, I set up the image I want for a stamp in Photoshop at 508 pixels per inch (.05mm). This setting gives me sharp edges. Like I said, 254ppi (.1mm) just doesn't look good that small. I make sure there are no gray pixels, only black and white. I reverse it left to right and invert it black and white, then save to a jpg at 100% quality. Gif files work great too.

I tape my rubber stamp material to a thin sheet of steel to prevent moving. This also acts as a heatsink. The rubber can get quite toasty. I burn horizontal, bi-directional. When one pass is done, I use a small paint brush and vacuum to clean out all the ash, then burn pass 2. Rinse and repeat.

I use a Osram PLTB450B diode from DTR with a Techhood current driver at 1.8 amps, 3 element lens tweaked to the sharpest line, less than .004 inches. That should give me about 1.6 watts out including the 30% loss througn the lens.

At 100% power, you need to find the speed that doesn't cause the rubber to flame or extremely discolor but gives you the maximum burn depth.

One thing you could do is increase the font size a tad in the GCODE window. Kinda small on a laptop. Old man eyes.
Retired Industrial Electrician, PLC
500mmX500mm Openbuilds frame
1.6w, 2w, 2.5w laser heads

Zax

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Re: Pproblem with a stamp
« Reply #16 on: February 05, 2018, 10:09:22 AM »
One thing you could do is increase the font size a tad in the GCODE window. Kinda small on a laptop. Old man eyes.

Noted.

bob2299

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Re: Pproblem with a stamp
« Reply #17 on: February 06, 2018, 07:11:27 AM »
Thank you both for all the help and suggestions.  Now I will wait for my new rubber to arrive and go to it.  I'll post results then, again, thanks.

Bob
-EleksMaker - A3 2.5 W Laser with Mana SE board
-Laser Air assist and a modified Hako smoke absorber
-Inkscape, Qcad, BCL, & T2, My interest is marquetry/inlay
-MonoPrice Mini 2 3D printer
-I live in London, Ontario, Canada

bob2299

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Re: Pproblem with a stamp
« Reply #18 on: March 21, 2018, 01:45:00 PM »
I finally received my low odour stamp rubber from China by way of Thailand.  6 weeks!

Lasered several stamps with good results.

I prepared the drawings in Inkscape, saved as png files.

Loaded png file into T2.  Using T2 edit menu I flipped vertically and then inverted drawing.  This gave me proper orientation for the stamp to print properly.

Using T2 I set my size 37mm x 37mm, laser power 100%, resolution 0.05mm, Greyscale, diagonal.  Lasered 4 passes to get total depth of cut of approx 0.040" (tried 0.06 and 0.07 resolutions and found it cut well and left a vertical patterm but it did not effect the stamp and was a little faster).  I vaccuumed the stamp after each pass and then brushed with a stiff bristle and again vaccuumed.

Thanks to Zax and Mauriceman for their help and suggestions.

Bob
« Last Edit: March 21, 2018, 01:47:15 PM by bob2299 »
-EleksMaker - A3 2.5 W Laser with Mana SE board
-Laser Air assist and a modified Hako smoke absorber
-Inkscape, Qcad, BCL, & T2, My interest is marquetry/inlay
-MonoPrice Mini 2 3D printer
-I live in London, Ontario, Canada

Zax

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Re: Pproblem with a stamp
« Reply #19 on: March 21, 2018, 01:50:04 PM »
Excellent, I will have to get some of that material to test.

bob2299

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Re: Pproblem with a stamp
« Reply #20 on: March 31, 2018, 07:39:28 AM »

Here is a photo of the stamps mounted on wood and acrylic handles and an imprint.  My friend is planning to place gold stamp impressions on wooden, turned lacquered boxes.  Will post photo when completed.

Bob
-EleksMaker - A3 2.5 W Laser with Mana SE board
-Laser Air assist and a modified Hako smoke absorber
-Inkscape, Qcad, BCL, & T2, My interest is marquetry/inlay
-MonoPrice Mini 2 3D printer
-I live in London, Ontario, Canada

Zax

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Re: Pproblem with a stamp
« Reply #21 on: March 31, 2018, 05:18:34 PM »
They look really nice, high quality work.

Network23

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Re: Pproblem with a stamp
« Reply #22 on: July 06, 2018, 12:48:48 AM »
I finally received my low odour stamp rubber from China by way of Thailand.  6 weeks!

Do you have a link? Thanks.

bob2299

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« Last Edit: July 10, 2018, 08:45:07 AM by bob2299 »
-EleksMaker - A3 2.5 W Laser with Mana SE board
-Laser Air assist and a modified Hako smoke absorber
-Inkscape, Qcad, BCL, & T2, My interest is marquetry/inlay
-MonoPrice Mini 2 3D printer
-I live in London, Ontario, Canada