Sorry to hear about your troubles Dave. I recall one Sunday morning many moons ago, parts of a b9 sliding off the torso and smashing on the driveway during a build off setup. In addition to those parts being destroyed, the torso was damaged and the neon in the glass that would later lees to a failure. All because I was tired and in a hurry. Your not a lone my friend. However sometimes you just need to step away
Misspelling courtesy of my iPhone 6 Plus
Thanks for the support guys. Sometimes the only way I can keep going on a project like this is just to admit that sometimes I'm a bonehead, in over my head and laugh at myself. Being able to share the tragic comedy of (some of) it with you guys helps. But with each failure, I learn.
OMG Jim, Backing over the torso with the car has got to be the ultimate brain fart. You must have felt terrible. How did it turn out? Was it salvageable and paint up OK after repairing it?
Changing Subject (kind of):
As long as I mentioned upgrading servos in my arm build; I'm in the process of redesigning both the claw open and close and the side to side wrist mechanisms.
I'm done with the claw rebuild and it turned out nice. The old design caused binding as I was trying to move the load of the claws with one servo from a center point of an unfixed rod. I changed to a smaller servo and added a second. With two small servos ganged together (one reverse wired) I was able to move the drive point from a center point to one point on each end of the rod. This gave me a good strong, stable and fixed movement.
As far as the wrist side to side mech; I was breaking the gears on the analog metal geared "Power HD 1501" servo I was using. It had the power to lift the load but it's not built to hold up to the stress of it's own power. My 3 pound wrist and claw section was just too much for this servo to lift vertically and hold up over time. I've come up with a way to mount a ServoCity gearbox in that little space (like the one with the big gear shown in the attached pic for lifting my wrist). This should easily stand up to this torture. It only adds 3 oz over my old design to the weight of the arm. With an analog HS-485HB or HS-645MG servo installed in the gearbox this should give me strong, smooth jitter free and quiet movement at this joint. I did try using a programmable "Ultra Torque" HS-7950TH here. It was plenty strong and with a Titanium gear set would have stood up to the pounding. However I had many problems with it in this application including jitter under load and it bouncing around in the deadband when the robot moved trying to stay centered. Adjusting it with the programing feature didn't help. Also, I couldn't get it to ever completely release once powered up. Sometimes analog is the only way I guess.
Cheers! Dave Schulpius
On Sat, Dec 12, 2015 at 7:54 AM, Jeff Main
jeff.c.main@gmail.com [B9Builders] wrote:
The ripped arm - oh the pain
The Will H. replacement - oh joy oh bliss
On Friday, December 11, 2015, Jim Cruff
jimcruff@gmail.com [B9Builders] wrote:
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Attachment(s) from Jim Cruff included below]
Reminds me of the day I ran over my torso. I was doing some Bondo work. At the end of the evening, I backed my truck into the garage and forgot my torso was on the garage floor. The sound of the cracking torso was horrendous.
So sorry about your arm, Dave.
On Fri, Dec 11, 2015 at 7:11 PM,
dschulpius@gmail.com [B9Builders] wrote:
[
Attachment(s) from
dschulpius@gmail.com [B9Builders] included below]
hehehe. Sorry guys. Couldn't help the drama.
Well actually the title wasn't too far off. It was a tragedy of sorts. Another case of being tired, in a hurry and frustrated. While upgrading a servo in my B9 arm build I neglected to remove a screw sticking up. I powered up the arm and moved it out of the torso under computer control. The flange of Will Huff's arm skin was still anchored to the forso. and the screw grabbed one of the bellows and stretched it out till...... RRRIIIPPP! It happened right in front of my eyes and so fast all I could do was drop my jaw (along with a warm, wet feeling down the leg of my pants). Kinda like watching a train wreck.
Thank God Will was in the middle of the last arm run of the year and was able to fit me in. Thanks Will!! What I don't have in my brains, Will now has in his wallet. LOL! (grown). Attached are a few tragic pictures.
Dave Schulpius
