Comments for Prutchi.com http://www.prutchi.com Cutting-edge diy projects Fri, 25 Oct 2013 09:41:55 +0000 hourly 1 http://wordpress.org/?v=3.7 Comment on Possibly the Only Accessible Border Demarcation Pillar Placed under the Franco-British Boundary Agreement of 1920 by kerry webber http://www.prutchi.com/2013/10/17/possibly-the-only-accessible-border-demarcation-pillar-placed-under-the-franco-british-boundary-agreement-of-1920/#comment-307 Fri, 25 Oct 2013 09:41:55 +0000 http://www.prutchi.com/?p=1290#comment-307 Dear David,

Thank you for making available research into the Franco-British Boundary Agreement of the 1920s. I am currently writing the biography of Colonel Newcombe of the British commission and found your photos extremely interesting. Would it be possible to use one or two in a blog entry, giving due credit of course? You mention your brother-in-law making available the original maps. Are there any others that you intend to post? I would be extremely grateful for any assistance in putting together this interesting story.
Best regards,
Kerry

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Comment on d.i.y. Moon Camera for EME and Radio-Astronomy Mounted on Space Communications Antenna Array by David Prutchi http://www.prutchi.com/2012/01/15/d-i-y-moon-camera-for-eme-and-radio-astronomy-mounted-on-space-communications-antenna-array/#comment-305 Sat, 12 Oct 2013 12:57:28 +0000 http://www.prutchi.com/?p=603#comment-305 Hi,
Thanks for the information. Someone stole my photo. That’s not me making those comments.
Cheers,
David

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Comment on d.i.y. Moon Camera for EME and Radio-Astronomy Mounted on Space Communications Antenna Array by Some guy on the internet http://www.prutchi.com/2012/01/15/d-i-y-moon-camera-for-eme-and-radio-astronomy-mounted-on-space-communications-antenna-array/#comment-304 Sat, 12 Oct 2013 06:37:21 +0000 http://www.prutchi.com/?p=603#comment-304 This comment will probably be caught in a spam filter because it has a link but there is a whole thread on 4chan blowing up which uses your antenna image. Did someone steal this photo off your site or is this you? Mirror: http://fuuka.worldathleticproject.org/b/thread/510400594/

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Comment on CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill by Bob http://www.prutchi.com/2012/02/04/co2-laser-engravercutter-addition-to-a-cnc-retrofitted-sieg-x2-mini-mill/#comment-296 Thu, 27 Jun 2013 09:43:00 +0000 http://www.prutchi.com/?p=629#comment-296 I’m planning this exact mod to a taig mill but I am going to use a 60 watt Chinese CO2 tube. Was considering to mount it vertically directly to the mill spindle but offset to the right side. Yes, it will be tall but should work fine. I followed the retrofit that tweakie did, very informative. Maybe I’ll document my build also. It is pretty interesting how you did the offset mounted laser. Only way I could do that would be to build a frame to mount the taig on, not out of the question at all. I could also mount the laser horizontally behind the taig and use a mirror system. I’ll have to think this over.

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Comment on Abigail’s Whimsical Sand Pendulum by tarita virtue http://www.prutchi.com/2012/03/18/abigails-whimsical-sand-pendulum/#comment-295 Thu, 23 May 2013 19:48:31 +0000 http://www.prutchi.com/?p=938#comment-295 I’ve been wondering how to make my own sand pendulum after someone ordered one for me as a birthday present from amazon.com; however when it arrived the parts did not match up and it had to be returned. Instead of going thru this again – which is utterly frustrating and more expensive I was THRILLED to find your website and Abigail’s desire to make one too!! Brava!! And all my gratitude!!

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Comment on CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill by David Prutchi http://www.prutchi.com/2012/02/04/co2-laser-engravercutter-addition-to-a-cnc-retrofitted-sieg-x2-mini-mill/#comment-293 Thu, 28 Mar 2013 19:07:06 +0000 http://www.prutchi.com/?p=629#comment-293 With plexy, cutting is not done on a single pass. It takes multiple slow passes to cut through all the way, but it does so very neatly. Color of the plexy doesn’t make any difference to cutting rates that I can tell.

Regarding the Chinese machines, I have a 40 W unit in my office from Full Spectrum Laser. I like it very much, especially its Retina Engrave software that allows CorelDraw to treat the laser engraver as a printer. It cuts acrylic just as my diy machine. By chance I have a reference 3/8″ piece in front of me that I cut with 15 passes at 50% FR and 20 mA to the tube on the FSL machine.

Cheers,

David

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Comment on CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill by Polytech http://www.prutchi.com/2012/02/04/co2-laser-engravercutter-addition-to-a-cnc-retrofitted-sieg-x2-mini-mill/#comment-292 Thu, 28 Mar 2013 17:41:54 +0000 http://www.prutchi.com/?p=629#comment-292 Thanks, David! Wow, 1/4″ plexi (acrylic) with 18W of IR! (what wavelength is that, BTW?) Epilog does not even call their 30W laser a cutter/engraver – it’s very much only engraver by their own admission. I think the only machine that earns the “cutter” designation by them is their 60W. Is there something particular about the output of this tube that makes it more capable perhaps? You’ve got me very intrigued here.

I was looking at the Chinese machines that come with 60 and 90W tubes but they are very bulky, so I’m mulling over the idea of building my own. I’m fine on the CNC and motion control part but the actual inner workings of the laser beam source is still a mystery to me, so I will appreciate any comment you may have on the cutting ability of your particular implementation since it does look more compact and rather easier to make than those with larger tubes.

Does the color of the plexi play any part, by the way? Do you happen to remember the feed rates you’ve used?

Thanks!

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Comment on CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill by David Prutchi http://www.prutchi.com/2012/02/04/co2-laser-engravercutter-addition-to-a-cnc-retrofitted-sieg-x2-mini-mill/#comment-291 Thu, 28 Mar 2013 16:51:14 +0000 http://www.prutchi.com/?p=629#comment-291 Hi Nick,
Thank you for your kind comments. Regarding your questions:
I regularly cut balsa and up to 1/4″ plexy
The beam is focused using a 1″ FL ZnS lens
Transparent plexy is sufficient to filter the relatively long-wavelength IR beam from a CO2 laser

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Comment on CO2 Laser Engraver/Cutter Addition to a CNC-Retrofitted Sieg X2 Mini Mill by Polytech http://www.prutchi.com/2012/02/04/co2-laser-engravercutter-addition-to-a-cnc-retrofitted-sieg-x2-mini-mill/#comment-290 Thu, 28 Mar 2013 15:45:55 +0000 http://www.prutchi.com/?p=629#comment-290 Awesome build! Pretty much the first laser cutter/engraver I’ve ever seen without flying optics. I guess, it must be the smaller size of the RF-excited tube that makes it possible. So, what type of material / thickness can be actually cut (as opposed to engrave) using 18W of power? Can you cut balsa sheets? Also, I’m very interested in whether you had to focus the beam and if yes, then how, can you share?
Sorry, so many questions in my mind … so, is a sheet of transparent plexi enough of a filter for the IR beam (scattered as in may be in the reflections)? Thanks!

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Comment on Abigail’s Whimsical Sand Pendulum by Kristy of Portland http://www.prutchi.com/2012/03/18/abigails-whimsical-sand-pendulum/#comment-289 Mon, 21 Jan 2013 08:48:19 +0000 http://www.prutchi.com/?p=938#comment-289 Thank you for posting! Very informative directions and photos. Cleaning out our garage, I found 2 antique carpenter’s “plumb bobs” and remembered those cool “Pit and Pendulum” sand pendulum gifts and thought, “I wonder if I could just make it myself for guests to play with OUTSIDE?”

I also thought, surely someone has figured out how to make this at home. Thank you again for posting this information! I can’t wait to get started.

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