This tool lets you scribe the centerline between parallel sides of a workpiece without any measuring. It is a two step process but works on short workpieces.
http://rick.sparber.org/aacs.pdf
Rick
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This tool lets you scribe the centerline between parallel sides of a workpiece without any measuring. It is a two step process but works on short workpieces.
http://rick.sparber.org/aacs.pdf
Rick
Great work as usual, Mr. Sparber! And I admire your efforts to ensure that your contributions aren't taken over by some sleazy patent troll.
Actually, it would be fun to watch the drama if someone tried to patent one of my ideas. More than likely they could pay the $$ and get a patent. But the first time they tried to defend it, the infringing party could show my "prior art" and their patent would be disallowed. So my "defensive publishing" poisons the well. And, by the way, call me Rick :-)Quote:
Originally Posted by DIYer
Thanks Rick! I've added your Self-Centering Scribe to our Measuring and Marking category, as well as to your builder page: Rick Sparber's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="/self-centering-scribe"><img src="/uploads/80148/self-centering-scribe.jpeg" alt="Self-Centering Scribe" /></a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="/self-centering-scribe">Self-Centering Scribe</a> <span> by <a href="/builder/Rick+Sparber">Rick Sparber</a></span> </div> <div class="tags"> tags: <a href="/tag/scribe">scribe</a> </div> </div> </div> </div>
Well designed Rick. I'm so making this! As always, thanks for sharing your ideas.
This tool has stood the test of time in my shop. I have two sizes so can go from 1/2" up to 6".
May you improve on the design!
Rick
Been thinking about adding bearings to the pins. Thanks Rick.
Replacing the guide pins with bearings would be a nice improvement. Just remember that if you change any of the pin diameters, they must all change and be of equal size.
Rick
Roger that Rick. Thanks for the tip!
Hi,
Will certainly make one also, great idea.
If not bearings that may be too large, it could be simply brass sleeves that can turn.
Thanks for sharing.
Hi Rick,
here it is, after a hard day at work, I needed to change my mind so I passed the evening in the shop and here it is :
http://www.labellenote.fr/file/Metal...ilieu_pile.JPG
http://www.labellenote.fr/file/Metal...ilieu_face.JPG
http://www.labellenote.fr/file/Metal...140_mesure.JPG
http://www.labellenote.fr/file/Metal...ce_mediane.JPG
Thinking about it, I simplified the scribe by leaving only a 1 mm hole, just enough to pass the tip of a pencil.
Works great !
Thanks for the idea !
I have some step by step pictures, I will put an article on my site one day or the other, I will make reference to your original idea , Rick, of course !
Cheers,
Christophe
Up up, what do you think ?
Very well executed Christophe! That's one beautiful scribe.
Christophe,
Brilliant improvement for use on wood! Nice job of machining too.
Congratulation!
Your website reveals more of your genius :-)
Rick
Great execution, Christophe! Using brass makes that tool look really classy.
This thread has been moved to the Must Read subforum. Congrats (and thanks) to Rick for making such a valuable contribution!
Nice idea but it seems like at best a approximation of the center line.
What if the scribe pin and edge guide pin are not exactly at 90° to the edge, which would be easy to happen?
Possible a flat edge instead of a round pin for the edge guide might help.
Nice idea thanks for posting.
Ralph
The flat would have to pivot as the distance between pins changed. Could be done. I use my tool a lot and usually scribe from both sides just to verify no surprises. The second scribe line has always fallen into the first line. Good enough for layout work.Quote:
Originally Posted by Ralphxyz
Rick
Thanks for the reply Rick, yeah scribing from both sides would check your accuracy. Interesting project thanks for posting.
Ralph
Thanks Rick,
Iwas thinking small router-bit bearings might work.
Nice look Christophe. I use 0.7 mm & o.5 mm pencils in my workshop but for that I think the 0.5 would probably be too brittle. Cheers!
It is typically referred to as "Public Disclosure", but I do admit that I am not at all familiar with how this is being handled in the present, Internetz age. In the old days, I'd mail registered letters to my IP attorney with a note written on the envelope not to open until notified as it contained IP and I was preserving my claim by virtue of the contents.Quote:
Originally Posted by rgsparber
In this case, it would be difficult to obtain a patent as it is a reinterpretation, or perhaps unique application of present art.
I have had a similar tool for nearly 30 years used for finding the centerline of the elevated rib on a shotgun barrel to permit one to center punch the very center of the rib for adding sight beads.
Nonetheless, yeah, I'll be making one of these, and I'm also seeing an opportunity for applying this to the concepts of the Fibonacci calipers I have. Thank you for the inspiration, "Let my inspiration flow" indeed!