#garfield Logs

Dec 14 2011

01:13 zhanx https://lh3.googleusercontent.com/-Mh5xRX5vNAc/TuhKWRnVjUI/AAAAAAAADHQ/5WjdUKuu85Q/s800/arm_bb.jpg
01:14 zhanx need to design some gears for the motors now
01:14 zhanx then do the math on the arm segements
01:15 rue_house my exhauston just exceeded my hunger...
01:15 e_house wraps the food up for the fr
01:16 zhanx wowo
01:16 zhanx what you been doing
01:18 zhanx rue i know you dont like steppers but I got 2 nema 23's and 4 nema 17's
01:18 zhanx err 3 nema 23's
01:18 zhanx for my arm
01:19 zhanx i couldn't find your arm on your site tho
01:23 rue_house !assist robots/arm4
01:23 tobbor Possibly http://eds.dyndns.org/~ircjunk/robots/arm4
01:23 rue_house you want my stepper and motion libraries to play with?
01:23 zhanx thanks
01:23 zhanx sure
01:23 rue_house its limited, you can only interpolate up to about 16000 axies at once
01:24 rue_house ok would you remind me tommorow, I'm apparently already asleep
01:24 zhanx well i am going to use a nema 23 at the base and for the first two joints and then maybe two nema 17s. one rotate the gripper and one to open/close it
01:24 zhanx ok will do
01:25 rue_house its designed for steppers, I'm not sure what it is right now, but I'm told you tell you that
01:25 zhanx k
03:08 Tom_itx zhanx why not beltdrive?
03:10 zhanx i cant find the gears for the belts even
03:10 Tom_itx stock drive products or mcmaster
03:10 Tom_itx i got the ones for my bot from stock drive products
03:11 zhanx thankyouo
03:11 zhanx no clue why they never came up in a search
03:11 Tom_itx http://www.sdp-si.com/
03:11 Tom_itx they have a belt calculator
03:11 Tom_itx for length
03:12 Tom_itx you may find em cheaper somewhere else
03:12 Tom_itx http://www.mcmaster.com/
03:16 Tom_itx http://www.mcmaster.com/#300l-timing-belts/=fctrg2
03:16 Tom_itx i don't know what series you need
03:16 Tom_itx you'll have to figure that
03:17 zhanx k thanks tom that helped a ton
03:17 Tom_itx i don't remember how they number them
03:18 zhanx looking at the timing gears now, i will figure that out
03:18 Tom_itx http://www.mcmaster.com/#l-timing-belt-pulleys/=fctsp4
03:19 Tom_itx you'd want smaller than that
03:19 Tom_itx the bore starts at 3/8 on those
03:19 zhanx yep that was the issue with mcmaster
03:19 zhanx but sdp has them
03:20 Tom_itx yeah i think mine were 3/16" bore
03:20 zhanx i got nema 23 motors for the bottom and they are 1/4 and nema 17 for the tip
03:22 Tom_itx mxl series
03:22 Tom_itx under mcmaster
03:23 Tom_itx start at 1/8" bore
03:23 zhanx k
03:24 Tom_itx belt drives aren't cheap
03:25 zhanx nope
03:25 zhanx still cheaper than metal gears tho
03:27 Tom_itx http://tom-itx.dyndns.org:81/~webpage/maxbot/image016.jpg
03:27 Tom_itx those were from sdp
03:28 zhanx k
03:29 Tom_itx pggt2mr172 is the belt
03:29 zhanx ok i need sleep will continue this in the morning
03:29 zhanx beeen searching all night for nothing :S
03:29 Tom_itx i got a couple different lengths within 1 or 2 teeth each way because i didn't trust their calculator
03:30 zhanx k
03:30 Tom_itx you may not need to since you'll have more room for adjusting the belt tension
03:31 Tom_itx http://tom-itx.dyndns.org:81/~webpage/maxbot/image009.jpg
03:34 Tom_itx oh cool, sdp has belt clamps so you can lock a table etc to it for a linear slide
19:20 zhanx Tom_itx: did a quick 3 wheeled robot base for a beginner robot while i was at it https://lh4.googleusercontent.com/-MBKwB2xbATs/TulIZImyfzI/AAAAAAAADJk/G2nuTscAtrQ/s576/path8204.png
21:02 rue_house haha did I start a tri robothon?
21:10 zhanx https://lh6.googleusercontent.com/-xI7ML1Bh4Tg/Tuli-fTr58I/AAAAAAAADJw/gBUwsSHccJ0/s912/path10380.png
21:10 zhanx yep
21:35 zhanx rue my arm design (work in progress) https://lh6.googleusercontent.com/-Na0EJvYjKNc/TulooDT4EII/AAAAAAAADKA/vuWzIndEq_Y/s640/path5350.png
21:41 rue_house yea....
21:42 zhanx belts and pulleys
21:42 zhanx needs the three wheeled base to be able to clean my room
23:27 zhanx rue_house: can i buy 3 motors with gear boxs for my robot from you?
23:31 rue_house is it ok if they dont come even close to matching?
23:32 rue_house finding even two matched pairs in my shop is a chore
23:32 rue_house the gearboxes on the mowerbot aren't matched
23:32 rue_house the rpm outputs are similar cause the motors aren't matched either
23:33 rue_house I tuned the motor-gearbox chain linkage to get it close
23:33 zhanx i am checking dealextreme right now
23:38 zhanx they have them cheap