robobob Posted August 7, 2005 Author Share Posted August 7, 2005 Robobob: Glueing these parts together will get you nowhere.They are more expensive than Poly-Ethylene but they wouldmake great bottles for superglue.....(!)Henk, It's amazing how the blatently obvious can manageto slip right past at times...Thanks for reminding me !On a more somber note : Link to comment Share on other sites More sharing options...
H.I. Gosses Posted August 7, 2005 Share Posted August 7, 2005 great! :P Link to comment Share on other sites More sharing options...
robobob Posted August 16, 2005 Author Share Posted August 16, 2005 Galaxy, part Two....I believe I will soon have the replacement gear in hand.Moving right along...I'm sure I'm overlooking something rudimentary here.What actually causes the gear/shaft to extend outwards ?The rotatomatics have those two different speed gearsworking together, which I understand (well, in the same sensethat I understand a good magic trick...), but for the life of me, I can't see what forces would push against the springloaded gear to move it outwards. It does turn at a different ratethan the gear next to it, but I dont see any mechanism to causeoutwards motion from that. I've run forwards, and run back, and pushed, and pulled, and still no light bulb has appeared above my head.Anyone care to help me see what I'm obviously NOT seeing ??? Link to comment Share on other sites More sharing options...
robobob Posted August 16, 2005 Author Share Posted August 16, 2005 Anothe shot of the innards.... Link to comment Share on other sites More sharing options...
H.I. Gosses Posted August 16, 2005 Share Posted August 16, 2005 I'ld loath to take mine apart to solve your mystery, but I will if nobody else comes forward with the solution. Remind me by email if you've reached desperation. Is it not so that the (absent) pinion pushes itself in and out of the oblong toothed-track? Thus the springloading of the shaft is there so the pinion can move in two planes. As you make such clear pictures, show me some of this track. Maybe it comes back to me.I know I once repaired some of these, but if I have a photographic memory obviously I didnot use a flash in this case...edit: ahh something is dawning: one cycle the pinion is outside the track, one cycle inside? uhhh... maybe,..... perhaps,.... possibly??? Link to comment Share on other sites More sharing options...
robobob Posted August 16, 2005 Author Share Posted August 16, 2005 Henk, you may be on to something here,it may be that the track itself causes the change.I will report back tomorrow, after a fresh look at things.Thanks !! Link to comment Share on other sites More sharing options...
bartzenegger Posted August 16, 2005 Share Posted August 16, 2005 i can not see in the pics. is there a gear that has a cam attached to it? it looks like a tab "bent " from the gear itself . if so it will go into another gear that has a hole cut into at a certain sequence. this tightens/loosens the spring and moves the shaft. good luck Link to comment Share on other sites More sharing options...
H.I. Gosses Posted August 17, 2005 Share Posted August 17, 2005 edit: ahh something is dawning: one cycle the pinion is outside the track, one cycle inside? uhhh... maybe,..... perhaps,.... possibly??? It seemed like a good idea, but it is another example of..."False Memory Syndrom"!!!!As you can see from the photo, it is just the rotate-O-matic trick but in another plane.The diecast cam pushes against the end of the shaft with the pinion. So the pinion engages/disengages the toothed rack.Simple and not a very sound construction as the shaft is eating the diecast cam. Link to comment Share on other sites More sharing options...
H.I. Gosses Posted August 17, 2005 Share Posted August 17, 2005 As you do not, apparently, have this cam, here are some measurements. Diameter 23,6 mm / lenght of the cam= 100 degrees / slope to full height over 30 degrees. end of the cam =dead drop.The cam has a thickness of about 1.8mm. As you will have to fabricate it make it a bit wider, so it will not be destroyed by the shaft. Link to comment Share on other sites More sharing options...
larry seven Posted August 17, 2005 Share Posted August 17, 2005 :) Wow, after seeing that last photo or two, this robot just went on my list of robots to buy in perfect working order only! -L7 Link to comment Share on other sites More sharing options...
H.I. Gosses Posted August 17, 2005 Share Posted August 17, 2005 ......& conversely Bart will want one too. (I wouldn't be surprised if he were to trade a working one for the Robobob's.)Without a lathe this missing part is difficult, but the robot is not more complicated than a rotate-O-matic. Link to comment Share on other sites More sharing options...
robobob Posted August 17, 2005 Author Share Posted August 17, 2005 Henk,Well, I now know the source of all the small filings coveringthe inside of the gearbox...The remnants of my cam !!Thank you SO much for the pictures and measurements...Even after taking a nap, I hadn't made any progress tonight !! It looks like I will have to open up the Fabrication Garagethis weekend.You're absolutely right, it is definitely NOT a design meantfor long life...What were they thinking ? Didn't these guys realize we would still be firing up their creations all these decades later ? I mean really !!!Thanks again ! Link to comment Share on other sites More sharing options...
robobob Posted August 17, 2005 Author Share Posted August 17, 2005 A follow up if I could....Henk, the gear in your picture, (the one riding inside the track), looks like it's made of brass,rather then plastic. Is it ??? Link to comment Share on other sites More sharing options...
H.I. Gosses Posted August 17, 2005 Share Posted August 17, 2005 Yes indeed. It is the larger module (0,65?) present in many-a-dog. On the otherhand I think it is of no great importance what it is made of. To keep some consistency in the design, Cake would be a good idea.As an aside: Mine has survived the opening and is considerably cleaner as a result of this "viewing-operation". Link to comment Share on other sites More sharing options...
9tobor9 Posted August 17, 2005 Share Posted August 17, 2005 Woof Woof ! As the chairman of the Remote Control Dog Appreciation Society, I would like to make official that HI Gosses & Larry 7 are on the deathwishlist of our members & will be terminated on sight..............................GRRRRRRRRRRRRRR Link to comment Share on other sites More sharing options...
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