View Full Version : Precision cuts past 60 degrees
11-08-2004, 09:12 PM
11-08-2004, 09:27 PM
Greetings fellow GyroBee brethren.
Last night I went to bed very pissed off because, after trigging out a cut-angle, realized it was beyond my mitreís capabilities. My saw only goes to 60, and I needed 66.9.
I carried this intense anger to bed with me and pulled it into a lucid dream. Suddenly a solution was visible and tangible. Use some scrap 2x2 equal to the height of the miter to subtract 90 degrees from the angle.
I tried this out tonight, and it works perfectly. See the following 4 images.
Based on absolute angles, it must work.
I'm going to bed now. Goodnight
11-08-2004, 10:10 PM
Brian, I think that is just brilliant!! Thank You, Vance
11-09-2004, 09:16 AM
Are you sure you didn't end up with 70 dgrees? :confused:
:D Naaa. I just set the miter for 23.1 degrees (or as close to it as I could see) and let 'er rip. I usually do about 3 or 4 passes, nudging the piece a little closer to the blade with each pass until it's dead-nuts on the mark.
I'm really enjoying the building process... It's kinda like playing chess; You have to be creative and think 3 moves ahead. Life is good! :)
11-09-2004, 12:09 PM
Just currious Brian, is that blade (carbide tips) ground for metal or is it wood blade?
I use a wood blade and the cuts are a bit course. If it is a metal cutting blade where was it obtained?
It's got real metal teeth all around it... the wooden ones just break off. :D
Actually it's for cutting wood, but it does a beautiful job on aluminum if you cut slow. A couple of passes and it leaves a mirror-like edge. Very sweet blade. And its low in carbs too!
11-09-2004, 12:36 PM
Nicely done. Beautiful cad shots too, very descriptive. Are you using a cutting fluid with that blade?
11-09-2004, 12:50 PM
0.1 degree precision on a COSMETIC bevel ?!
"And the award for craftsmanship goes to...."
Nice. Very nice. :)
11-10-2004, 09:44 PM
Tonightís update on the GyroBee build:
Prepare to pull instead of push. In creating mirror image parts I had to get creative on the table saw. The first image shows how you can indeed set up a block to draw backwards. It also shows the need for a steel backer (itís the black bar with an allen bolt in it.) Otherwise the load was spread over the 2X2 and made the stressed walls bow out, causing a curve instead of a flat surface. Made it kinda hard to base absolute angles on.
The second image shows how itís possible to use known-angle extrusions as working surfaces.
The third image shows how I used a short piece of the same material as an intermediate clamping force.
By the way, has anyone noticed the "Thumbnails" disappeared?
11-11-2004, 06:02 PM
Man, I feel like an absolute idiot right now. Turns out the reason I couldn't post photos was because I had the "Additional Options" pane minimized and just couldn't see the button. DUH! :p
Sorry for the temporary dain bramage. Probably just as well since, as of 20 minutes ago, my seat braces are complete except for drilling. The last photo shows one of the terminal ends (keel-side). Sorry for the glare off the beveled edge. It's a mirror-smooth surface and was hard to photograph.
What I was most happy about was, having spent the past several days obsessing over these 2 parts, they are exact mirror-images of each other when put together side by side. Freaked me right out. Tom Milton quoted an humorous anecdote in the "Nicest People At Airports" thread that seems quite applicable here: I'm grinning so big I could eat a banana sideways! :D
Happy dreams everybody!
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