nothing so planned :) my wheels are 150mm diameter, and working from sketchup scale I knew I needed about half the diameter of the wheel below the chassis rail to give me the correct ground clearance
for spring rates I guessed - if its wrong I can try adjustment, or swap them out for different springs the springs I used are part C830, I cant remember the manufacturer, but they are (from memory) roughly 2.87mm wire, 72mm long and 28mm diameter Don Shankin wrote: > looks very nice; I love the coil spring set-up. How did you go about > deciding your spring rate? Did you just estimate the total weight of the > vehicle and divide that by 16? Did you plan for specific ground clearance > when fully loaded? (I'm asking because I'm about to plan out a suspension > and would like others' thought processes) > > Thanks > > On Mon, Jan 12, 2009 at 12:04 AM, Modena <b...@holnet.net> wrote: > > > > > the preload is adjustable - the top spring seat can be brought lower > > by adding washers which have a larger diameter than the spring > > diameter, this compresses the spring more before adding load, and > > similarly you can add large washers to the lower spring seat to > > "raise" the bottom of the spring. > > > > as it "stands" it has 75mm of ground clearance, I have stood on it, > > and it takes my weight without fully compressing (remember there are > > 16 of those suckers) > > > > piling on 25kg of lead weigh (without me as well) t brought it down > > less than 1cm > > > > I cant be any more precise until I now the battle ready weight, and > > that is way off > > > > > > On Jan 12, 8:50 am, Mike M�ne <mike082...@gmail.com> wrote: > > > I meant the vertical travel. I'm just trying to get ideas for my Newbie > > > Sherman. > > > > > > Another question: With 1.5" - 2" of space, with the springs you used > > > combined with the weight of your tank, how much do you think the > > suspension > > > will flex with the tank immobile? In other word, how far down will the > > body > > > push down on the springs with all its weight---that is, if it does at > > all. > > > The reason why I ask is because I am wondering how one could adjust the > > > spring strength (without buying new ones) in case the weight of the > > vehicle > > > must change. > > > > > > Thanks and good work, > > > - > > > > > > > > > > > > On Sun, Jan 11, 2009 at 3:42 PM, Modena <b...@holnet.net> wrote: > > > > > > > you mean lateral flex parallel to the ground? its all adjusted pretty > > > > exact with nyloc nuts, there's about 0.5" of space between the lower > > > > chassis rail and the closest piece of the suspension arm > > > > > > > if you mean total travel of the suspension perpendicular to the > > > > ground, 1.5" is about it, it can go to 2" but we get some serious > > > > spring deformation > > > > > > > On Jan 12, 8:31 am, Mike M�ne <mike082...@gmail.com> wrote: > > > > > Nice work, Modena. Are you going to colour the Tiger orange like the > > > > wheel > > > > > hubs? :D By the way, how far (toward the body) can the suspension > > flex > > > > > before reaching the bar--or whatever? > > > > > > > > On Sun, Jan 11, 2009 at 5:09 AM, Chris Malton <chr...@cmalton.me.uk> > > > > wrote: > > > > > > > > > Looking very nice. > > > > > > > > > Mine got to that stage, and has now "got stuck" in the track design > > and > > > > > > build stage. I hope your one doesn't! > > > > > > > > > Chris > > > > > > > > > On 11/01/2009 10:55, Modena wrote: > > > > > > > oh I forgot to add, I hoping I guessed the spring rate correctly, > > as > > > > > > > you can see a 1" bar is enough to cause travel without lifting > > the > > > > > > > chassis, but the whole thing takes my entire weight too when I > > stand > > > > > > > on it (roughly 85kg's) > > > > > > > > > > currently all the springs are the same type, I can adjust the > > > > pre-load > > > > > > > by adding large diameter flat washers to bring the top of the > > spring > > > > > > > closer to the bottom of the spring when the suspension is at > > rest, I > > > > > > > also might need to change to a stiffer spring for front and rear > > > > > > > bogies because they will take more stress from the track wrap > > > > > > > > > > On Jan 11, 9:50 pm, Modena<b...@holnet.net> wrote: > > > > > > >> its a Tiger, and its now rolling! Just not under its own power > > > > yet... > > > > > > > > > >> 16 wheel independant suspension > > > > > > > > > >>http://www.holnet.net/images/tank/20090111/ > > > > > > > > > >> I've pretty much decided to do a chain track, I cant find hinges > > the > > > > > > >> exact size I want, and they would cost more than a chain > > solution > > > > too > > > > > > > > > >> On Jan 11, 5:18 pm, "Chrysanthos Kanellopoulos"< > > xchr...@otenet.gr> > > > > > > >> wrote: > > > > > > > > -- > > > > > -Mike M�ne @http://moonrcprojects.googlepages.com > > > > > > -- > > > -Mike M�ne @http://moonrcprojects.googlepages.com > > > > > > > > -- > ---------- > Donald Shankin > Computer Engineering Undergrad > Blue Marble Security Member > IEEE Vice Chair, MTU Chapter > NSBE Telecommunications Chair, MTU Chapter > CAEL Partner > (507) 301-2499 > dtsha...@mtu.edu > dshan...@gmail.com > ---------- --~--~---------~--~----~------------~-------~--~----~ You are currently subscribed to the "R/C Tank Combat" group. 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