Zerobricks Posted January 27, 2013 Posted January 27, 2013 Few days ago I got an idea to make a telehandler, but doing it like TLG would. I thought of using a gearbox to control the functions via motors. I used a simillar, but improved mechanism like 8043 to control the 6 functions: Drive Front axle steering Rear axle steering Arm raise Arm extend Tilt the showel/fork The gearbox was placed on a 4x4 chassis and the whole thing is suspended with the hard springs. Here's the end result: Thanks to its short wheelbase, the model is very nimble. The gearbox operates the 6 functions. The arm can be extended some additional 20 studs via a worm gear. Also note the 2 LA's for lifting the boom. As mentioned earlier the machine has suspension: Notice the mini LA's used for steering: And the video: It can lift almost a kilogram, and the max height is somewhere arround 90 cm. The model itself is quite heavy, yet compact and even though there is only 1 M motor driving it, its still capable of going over bumps, etc. Quote
Alasdair Ryan Posted January 27, 2013 Posted January 27, 2013 I am not a fan of the styling and the telescopic boom design. Its good that you have motorized it with drive and steering and that you have also motorized the arm. Quote
DLuders Posted January 27, 2013 Posted January 27, 2013 Wow, Jernej, that's a great MOC! The great range of the extending boom, and the demonstrated power of the Linear Actuators, are really special. It sure beats the punyTelehandler sets below. Do you have any plans to create an LDD .lxf file? Quote
Zerobricks Posted January 27, 2013 Author Posted January 27, 2013 Yes i have been thinking of the lxf file, will see :) Thanks! Quote
Paul B Technic Posted January 27, 2013 Posted January 27, 2013 The functions of that are very cool, well done. Quote
LegoGBC Posted January 27, 2013 Posted January 27, 2013 Thats very cool,tough the boom seems a bit...fat? :D Can you give more details about the extending mechanism? I cant see racks there,and a LA wont get this far... Thanks Quote
Paul202 Posted January 27, 2013 Posted January 27, 2013 That's pretty cool, one of the better Telehander mocs I have seen. Quote
trekman Posted January 28, 2013 Posted January 28, 2013 Good functions, but I am not sure that the linkage to the bucket would ever become an industry standard. Quote
DarkShadow73 Posted January 28, 2013 Posted January 28, 2013 (edited) Thats very cool,tough the boom seems a bit...fat? :D Can you give more details about the extending mechanism? I cant see racks there,and a LA wont get this far... Thanks I agree with a couple others, the boom seems way too large for a telehandler with all the fairings and such. Color scheme is different, usually telehandlers are yellow, orange or blue in the USA at least. Nice model though all things taken into consideration. One other thing I thought of too, almost all telehandlers have stabilizers on the front to keep it from tipping or going out of position when lifting. Also, thought of what DLuders said about the other telehandlers that TLG has released. The 8295 could have been much better, the steering setup is impossible and IMO it is too wide. I actually built my 8295 into the b model Log Loader, it is much better looking model. That's pretty cool, one of the better Telehander mocs I have seen. A few weeks ago, somebody made a blue telehandler that was really excellent, made out of just the parts from the 8052 Container Truck. My only beef was the rim and tire sizes, I plan to build that model but put on taller tires, and if it works larger rims, much like the ones on the 8295, or possibly even the standard rim/wheel combos on, say the 9397 for an example. Edited January 28, 2013 by TechnicFreak Quote
Zerobricks Posted January 28, 2013 Author Posted January 28, 2013 Thats very cool,tough the boom seems a bit...fat? :D Can you give more details about the extending mechanism? I cant see racks there,and a LA wont get this far... Thanks There is an internal rack under the bottom part of the arm, which is driven directly by a worm gear. Quote
hrontos Posted January 28, 2013 Posted January 28, 2013 Very nice use of LAs. It surprises me, that it is able to lift 1kg. Boom lifting LAs seem to be something like 5 studs away from pivot and even non-retracted boom is 30 studs long. So the weight of cargo is like 30/5 at the point where LA is attached. This is at least 6kg force on the LAs. Did you have any particular reason to retract the "panelled" part of the boom? That portion seems to be heavier so it should be static and the lighter inner part should retract. Or are there some other benefits of this behaviour? Quote
Zerobricks Posted January 28, 2013 Author Posted January 28, 2013 The fact the outer part slides, is because the inner part houses an old style diff with clutch changeover parts, which allow a 32 axle to slide smoothly inside. The 32L axle powers the LA in the end. Quote
Alasdair Ryan Posted January 28, 2013 Posted January 28, 2013 (edited) The fact the outer part slides, is because the inner part houses an old style diff with clutch changeover parts, which allow a 32 axle to slide smoothly inside. The 32L axle powers the LA in the end. Why did you not mount this at the top end of the static part of the boom? This would give you a more realistic solution. Edited January 28, 2013 by Alasdair Ryan Quote
hrontos Posted January 28, 2013 Posted January 28, 2013 The fact the outer part slides, is because the inner part houses an old style diff with clutch changeover parts, which allow a 32 axle to slide smoothly inside. The 32L axle powers the LA in the end. Thank you. So there is a connection between motor and LA. But since it is a connection, it is not important on which end is the motor and on which the LA. Would it be possible to rotate whole boom? So that panelled part is fixed and inner part retracts. And attach the fork with the LA to the inner part where is motor attached now and attach motor to the panelled part where is the LA now. May be I miss some important detail. I would like to see that detail with diff, because that sliding gear solution always bothered me. I wonder why only worm gears can slide. TLG should produce also some other standard gear that can slide on axle. Usefull for these retractable booms. Quote
Alasdair Ryan Posted January 28, 2013 Posted January 28, 2013 (edited) I would like to see that detail with diff, because that sliding gear solution always bothered me. Here is the idea I came up with some time ago. Edited January 28, 2013 by Alasdair Ryan Quote
bord4kop Posted January 28, 2013 Posted January 28, 2013 Now there is a nice MOC. It may not look very beautiful ( sorry ) with the yellow and red, but it sure as hell works very good! One must look beyond the colors to see the very good engineering beneath! I like you technical skills! Very good MOC Quote
Lipko Posted January 28, 2013 Posted January 28, 2013 I'm planning to make a telehandler too. For the sliding axle issue, I will just omit the sliding axle (I don't own a 32L axle, and it's limiting anyway), and instead I'll use two (or 3, if I implement pallet fork twist) gear racks, and the racks will be operated through differentials. One rack will be the boom itself, the other rack(s) will operate the other function(s). The slight speed difference between the racks that I can solve with the differentials, will move the pallet fork. I plan to add automatic levelling of the fork too, something I haven't seen yet in expandable boom telehandlers made from Lego. Anyway, it's nice to see that i can "compete" with so fine models. Quote
hrontos Posted January 29, 2013 Posted January 29, 2013 Here is the idea I came up with some time ago. Link to movie. Thank you for the explanations. That is a nice hack to overcome this sliding limitation. I hope there will also some more compact solution in the future. Quote
DarkShadow73 Posted January 29, 2013 Posted January 29, 2013 (edited) I'm planning to make a telehandler too. For the sliding axle issue, I will just omit the sliding axle (I don't own a 32L axle, and it's limiting anyway), and instead I'll use two (or 3, if I implement pallet fork twist) gear racks, and the racks will be operated through differentials. One rack will be the boom itself, the other rack(s) will operate the other function(s). The slight speed difference between the racks that I can solve with the differentials, will move the pallet fork. I plan to add automatic levelling of the fork too, something I haven't seen yet in expandable boom telehandlers made from Lego. Anyway, it's nice to see that i can "compete" with so fine models. I made a telehandler out of the b model of the 8049 Log Loader. Was quite easy, also made a quick disconnect so a platform could be added for a manlift, much like Genie boom lifts. Was quite easy, just took off the useless grappler assembly. Wish I had a digital camera to show the forum. Its not real big, but it extends out quite far, just used a 16L axle from the 8416 Forklift set. The extension of the telehandler/manlift is manually operated via gearing and the actual lift of the boom is pneumatically operated. As far as the tilt of the forks or the manlift platform, unfortunately I couldn't figure out a good way to pneumatically operate it, so it is also manually operated much like the 8295's forklift is. Still looks good and the lime green and red boom color scheme seem to mesh quite nicely IMO. Edited January 29, 2013 by TechnicFreak Quote
Traktor Posted January 29, 2013 Posted January 29, 2013 To me it seems kind of strange to have suspension on a tele handler, because of the risk of tipping over especially when it does not have any form of outriggers. Quote
Alasdair Ryan Posted January 29, 2013 Posted January 29, 2013 Most telehandler's have swivel suspension only on the front axle. Quote
matias bendtsen Posted January 29, 2013 Posted January 29, 2013 (edited) Most telehandler's have swivel suspension only on the front axle. i hope you mean rear axle, or i would not be the driver at 1:40 the rearaxle tips to the other side: Edited January 29, 2013 by matias bendtsen Quote
Alasdair Ryan Posted January 30, 2013 Posted January 30, 2013 Ah yes I meant the rear axle,I know it was only one on the manitou's and jcbs. Quote
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