Tournarocker Diversion Build
Since I don't have any trucks to fool around with I decided to convert an old 1953 Nylint Tournarocker sandbox toy to RC. The 1:1 machine was a diesel electric driven tractor steered by turning switches on and off on the dash and dumping is achieved by a winch with it's cable attached under the rear axle that pulls the rear forward dumping it's payload. I'll update some vintage photos when I scan them.
I want this to be a fairly simple conversion that uses a dual transmission controlled by a Dual Sabertooth motor control giving the machine "tank" steering similar to the 1:1 machine. Original toy only thing missing is the oscillating hitch : http://img269.imageshack.us/img269/8499/dscn0785sz.jpg http://img802.imageshack.us/img802/6826/dscn0786.jpg Here is the start of the housing: http://img269.imageshack.us/img269/2772/dscn0779mf.jpg http://img190.imageshack.us/img190/7418/dscn0778q.jpg http://img713.imageshack.us/img713/7149/dscn0781je.jpg Tapping 1-72 threads is SO much easier than tapping the thousands of 0-80 threads on my dragline model.:) http://img402.imageshack.us/img402/6528/dscn0782me.jpg Trying to find the sizes the ring and pinion are set up to.:confused: http://img101.imageshack.us/img101/680/dscn0783g.jpg This set up is a Axial 13/43 ratio. This is a nice gear set -Helical and heat treated. http://img207.imageshack.us/img207/67/dscn0784u.jpg Half partially done. I want to install ball bearings through out when Im sure I have the ring and pinion set correctly. http://img510.imageshack.us/img510/1241/dscn0787d.jpg |
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I've seen video of the 1:1 and its a pretty interesting machine. This will be a cool build.
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Cant wait to see this working.;)
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Love it! Those are good looking gears! Those are some of the more conventional Letourneau machines. My dad ran one a little. He said if you spin out you can inch your way out by setting the front brakes, raising the box, setting the rear brakes and lowering it. Repeat as often as needed.
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Looks cool Steve. I had a toy similar to that when I was younger. I think it was green though?
Brian |
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Wow!! Amazing already! Cool that it is so different too.
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Nice start Steve.
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I like your machine work! You are already off to a great start. Any project that begins with custom machined parts is a good one. This will be an interesting project. I have never seen anything this Tournarocker before.
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Very nice work as always steve-although I am not real clear on what you are doing I'm sure it will make sense later.
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Fascinating project!
Looking good already :) |
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Great idea and it looks like you are off to a good start. Now if I understand what you are doing with the drive it will be front wheel drive and use separate motors for each side and the front will do the driving and steering as well. If that is the plan you will probably have a traction problem especially when it is loaded. You are going to need a lot of weight in the front with some tires with a lot of traction. Good luck and I cant wait to see how it turns out.
Travis |
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Thanks for all the encouraging words you guys. SmallHaul Scott captured a nice video of one of these machines at our steam show this past August.
http://www.youtube.com/user/SmallHau.../1/RRxBpOnc3pw Travis, The way it can wiggle side to side should give decent traction. I'm real skeptical about the original hard rubber tires but they're going to be tried before I change them. I may have to set them up in the mill and cut some relief in the lugs like pulling tractor tires. As far as weight, I'll play that by ear. The thing is pretty heavy already. I don't know what battery setup I'll need yet. I'm looking for about 12v. |
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I've never seen anything like this before, toy or real life. What a concept for simplicity! :cool:
Great video Scott. |
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Any progress on the drive system?
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No progress yet Tom. I have some side work that's occupying my time in the evenings.
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What a different type of truck:eek::eek: Can't wait to see yours running!
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Decided to work on this some more this weekend. I still have to get another ring and pinion to put both sides together. I tested the one side and it works very smoothly and not much gear noise at all. I did manage to make the wheel hubs but I need some longer #2-56 lug bolts. Maybe by the end of the week I'll be able to test run it.
Cutting the gearbox cover: http://img841.imageshack.us/img841/1989/dscn0860v.jpg http://img15.imageshack.us/img15/5806/dscn0861q.jpg Turning one of the hubs. I used steel so I get as much weight as possible for better traction. http://img23.imageshack.us/img23/4120/dscn0864e.jpg Centering part to get the lug bolt holes and undercut where the original toy's bearing would hit: http://img851.imageshack.us/img851/1461/dscn0865r.jpg Undercutting for the original hub bushing: http://img64.imageshack.us/img64/6475/dscn0866m.jpg Drill: http://img839.imageshack.us/img839/6366/dscn0867mb.jpg Tap for #2-56 bolts: http://img842.imageshack.us/img842/6831/dscn0868ej.jpg 3/4 done: http://img94.imageshack.us/img94/7802/dscn0869z.jpg |
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Great progress! I take it your mill is CNC? I don't see a rotary indexing table in the photo, taken during the undercutting picture or hole drilling process.
How hard was it to set up your gear mesh? I'm kind of curious how you went about it. Looks like you took some measurements off the granite table and adjusted the shims under the gear till the mesh was perfect. Then bored the holes in the gearbox to get it right on. I like how you share photos of the machining process. Helps newbies, like me, learn some new things. |
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Very nice! Thanks for the insight! So judging from your photos, it looks like you use a reamer to make the bushing and bearing holes more precise? Would an end mill leave the fit sloppy?
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Nice work steve-Those look like planetary g.m's. plus more gearing to the pinions. You should have lots of power!!
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nice work this is another cool project
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Finally got the other ring and pinion ordered and now I have it installed in the gear case. I put everything together and taped the electrics on and gave it a try. The thing steers and very nice but the motors are WAY too weak to do any justice. Actually there's a gear inside slipping on a shaft as I can hear the motor running. This is my first time mine you,that I have built a RC vehicle other than my walking dragline so this stuff is all new to me. I'm going to have to try some other motors but the size will be a big factor. The Swiss Maxon motors are sure nice quality motors but I don't understand the numbering system they use to choose the proper size and RPM,and the green ones I've been picking up on Ebay use their old numbering system and there's no old links giving this info.
I'm going to look at some of the BaneBot motors I guess unless anybody has any ideas but as far as size; They need to be no more than 1''OD x 3.5''L and speed around 300rpm. Drilling wheels. The old toy wheels sure wobble! http://img442.imageshack.us/img442/9973/dscn0870fp.jpg Ring gear spool: http://img197.imageshack.us/img197/7480/dscn0871z.jpg Tapping spool: http://img585.imageshack.us/img585/6935/dscn0872q.jpg Found out that some of the Traxxas gears are heat treated, I fixed that with a quick annealing from the jewelers torch. http://img23.imageshack.us/img23/8131/dscn0873t.jpg Cooling down http://img692.imageshack.us/img692/8421/dscn0874x.jpg Inside the 2nd gear reduction: http://img5.imageshack.us/img5/7121/dscn0875xm.jpg Finals: http://img401.imageshack.us/img401/5254/dscn0876p.jpg I'll have to make a cover I guess for the finals . http://img401.imageshack.us/img401/9008/dscn0877j.jpg |
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How in the **** did you get the gear mesh set without having any adjustment!!! I guess when your good your good!!I look forward to each and every post from you man..Why not just use a couple of RC4WD 45,55 or 65 turn motors?
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That's some nice machine work!
For Banebots planetaries, the 540/550 sized gearboxes are 1.5 square, O.D. Length varies with the number of stages. I have a 256:1 sitting right here and it's 2 and 13/16" long. That's just the gearbox. Motors add length. You might have to go with something smaller. They make some 390 sized planetaries, but I don't know the dimensions. They are really good about listing all the major dimensions you need, right online. I'd suggest checking out Servo City's precision gearhead motors too. They are more compact, run on 12-24 volts and can be purchased in a variety of RPMs. You can always mix and match Banebots planetaries with different motors to get a good workable RPM range. Just need to do some simple math and figure out what the motor's Kv rating is. Kv = RPM/volt. |
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Wow that differential looks great. I love how it fits just inside the body, are you going to bolt it staight in or are you gonna make a complete frame for it to go with?
Tyler |
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Very nice work steve-I didn't realize these motors were this small. This is the same problem I had -finding small dia. motors with enough torque but I had 1.35" dia. to work with. Have you looked at "robotmarketplace". They have some small dia. motors but are not going to be high in torque rating. The "beetle-62:1 is .86"dia. and 300RPM but not much torque. Hope you find something, I'm anxious to see this work!
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Re: Tournarocker Diversion Build
Some things to consider:
Angle the whole assembly slighty (or a lot) upwards. This might offer a bit of space. Use motors with non-concentric (eccentric) output shafts and arrange them so that they use the space better. (There's quite a bit of empty space between the motors now, so the motor housings could be rotated inwards with eccentric shafts.) RB35 motors, replaced with 380/400 sized motors are a force to be reckoned with and have eccentric output shafts. Como-Drill also makes some nice gear motors like that. |
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Looks real good Steve we will get to see it work in a few weeks. The evacuator is almost done and maybe I,ll get the loader done also. Ed
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Here is one that I'm considering:http://www.anaheimautomation.com/pro...tID=103&cID=46 The model R19 is looking pretty good but looks like a special order in that ratio. I may go with the R27 but may need to overdrive the secondary reduction some. My final output speed is: 35RPM but would like to see 50rpm so it won't be so boring on a long haul. |
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If you have the room for a 1.25in motor the Carson gear motor that they use for there scissor dump would be perfect for you, that is what we use to run the screw drives in our dump trucks. The shaft is offset to one side. The torque of these motors is unbelievable and it is the right RPM you are looking for
http://i574.photobucket.com/albums/s...p/IM000706.jpg Travis |
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Thanks Travis, That looks like one of the motors I've been looking at. What rpm are you running in that hoist?
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The motors, as I posted earlier, Have to be small gear motors and have ample torque to pull the load and fit into the narrow space under the frame. |
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These motors are close to the RB35 (popular in Europe) and even come in more rpm choices:
http://servocity.com/html/3-12v_gear_motors.html Edit: these might be the same that Espeefan suggested? They do have a 12-24V section as well, but the sleection is much smaller thanj for the ->12V motors: http://servocity.com/html/12-24v_gear_motors.html Similar style motors are offered on ebay, mainly being sent from China/Hongkong, search for gear motor. |
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Travis |
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That gear box looks great Steve. You could probably start building gearboxs and they would sell like hot cakes.
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If this gearbox works out, it could be beefed up some and used in a dozer. I have an old Doepke D6 that this would fit right in the frame. A undercarriage would have to be built also. But I have enough projects started at the moment to build one of those. |
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Great Work!
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I'll be using 2 of these motors for the gearbox now. I just ordered the 3rd one down with the 14:1 ratio. Hope it has the power and speed I'll need.
http://anaheimautomation.com/product...tID=103&cID=46 . |
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