Quote:
Originally Posted by Cooper
Hey dads, thanks!! 1) nice to see the one video of you loading, one 5gallon bucket, and another scoop!!! Really puts perspective on how much material is in the dump body!! 2) water jet!?!!! You are so lucky!!! I need to go over to next town, a guy that has a food automation processing line company specializes in water cutting,, I really should go see him as he is a big fan of scale planes. Right next to his facility he has a manicured 100+yard runway. Figure similar RC interests I might get some cheep cutting done. 3) I have the two drive motors of 256:1 gear reduction. Don't know what motor is on the end, but noisy little buggers at 12v!!! Might not need any sound system!! I'm thinking that having two for drive will be enough torque and power. And yes I'm trying to take all weight off motor shafts and put on axles. With not wanting to spent $100-200 on a single slim profile bearing (needing 4) I am trying to incorporate 2" bearings for wheel hub carrier. I'm planing on having the two motors in axle, hopefully use some radio programming for a differential effect when wheel turned to left/right max. And some good info on your build, I would never have thought about proper geometry on Ackerman effect if you would have not posted about it!! Tires? I really wanted to use the same ones you got and not have to go through the whole process of making them. If I remember correct they were just a little too off on dimensions for my project. Spent a lot of time trying to find tires, just couldn't find close enough size. Might be able to work something up for you in future!! Still need to see how they preform in actual use.
|
I hear ya about how noisy the motor/gear box is , I thinks it is because of all the gear reduction in the box 256:1 might have something to do with it...lol...one other thing to be carefull with is the grease you put in the gear box, when I bought mine it was not greased, I think they might be sending them out with grease in them now, people where putting the wrong grease in and cooking the first stage of gears, even with the proper grease the gear box does get hot after running for a while but your way of mounting them in the ALM. HSS should act like a big heat sink which will be a big plus in keeping the gear boxes cooler.
Finding the right size tires of the shelf for this size of truck is just not possible the tires I used are near the proper size but are just a bit small and too narrow but much like you I try build function first and "scale looks" sometimes takes a back seat to the design, always have to compromise a bit between function of available parts and the overall scale looks, so you will be happier with the end results and look of the truck with all the work you have put into making the tires, the pay off will be worth all the effort, and besides the rest of use are all learning with you. (our cost of learning from you and others is just a lot less...LOL)
So have you figured out how you are going to steer it?? Hydraulics would be better then what I built.... would make a much cleaner build...and you seem to be good with hydraulics. I thought of using one or two linear actuators but nothing out there is strong enough, my experience with the L16 that have the 150:1 reduction has not been good at all, the tiny gears in the drive just dont last long but the 63:1 L16 have worked very well and for a long time but I dont think they would be strong enough to steer a big truck when it is loaded. I'm sure you will figure out a new better way to steer this monster!!
KP