I am thinking about tack welding the sprockets to the shaft on the outside, and grinding my own "key" inside the hull for the other sprockets to seat down. The problem that I have is that keyed sprockets cost 3 times more money than non-keyed one's. I can afford $40 for 4 sprockets, but not $120.
On Monday, March 11, 2013 4:47:51 PM UTC-6, [email protected] wrote: > At a minimum I would go with keyed sprockets. Set screws alone will not > hold the torque of the drive sprockets with tracks this heavy. IMO, > drilling through the drive shaft to use a bolt would also weaken the shaft > too much. I use Trantorque keyless bushings (www.fennerdrives.com) on my > KV-2 drive sprockets to secure them to the shaft. The Trantorque keyless > bushings push out on the sprocket center bore at the same time as cinching > down on the drive shaft. They aren't cheap ($30/per) unless you can find > them on Ebay like I did ($5/per). I like to use 5/8" drive shafts since > some of us here (not me) have bent 1/2" drive shafts under heavy loads. > Suspending one or more heavy sprockets with heavy tracks on the end of a > 1/2" shaft is a recipe for disaster in my mind. Using Trantorque bushings > also means you need to buy sprockets with a larger center bore. Sometimes > they are easier to find on Surplus Center than the larger sprockets with > the smaller bores. I have a metal lathe and have been able to reduce the > size of the hub portion of the sprockets to reduce some of the weight > without compromising the strength of the sprocket. > > Never had any issues using either even or odd toothed sprockets. There > will be some track slack so there are no issues I can think of. Are you > going to use a single strand of chain per side or a double strand? I have > tried the double strand and I had some issues with derailing, but that was > with single pitch chain, not double pitch. 2060 chain like that does not > flex at all side to side like the single 60 pitch stuff I used. That chain > in the link only has the "ear" on one side (A2 attachment). Most of the > 2060 chain others have used (including me) have the K-1 attachment (an ear > on each side of the link). Make sure if you use a double strand of chain > that the teeth on the drive sprockets are perfectly aligned with each other. > > These are all just my observations from using heavy tracks. > > Derek > > > > > On Mon, Mar 11, 2013 at 3:20 PM, Jacob <[email protected]<javascript:> > > wrote: > >> I found two 10foot 2060 chains for $50 each, they are US Tsubaki >> RF2060R-A2-10, w/A2link, Roller Chain, Cottered. Now my question is, do I >> need an even numbered sprocket, like a 24 tooth, or can I go with an odd >> number sprocket, like 23. Im looking at 60P 23tooth unfinished sprockets >> from surplus center for about $8 each (need 4). I will have to drill set >> screws but that is fine too. thanks >> >> >> http://www.ebay.com/itm/160978807531?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 >> >> http://www.surpluscenter.com/item.asp >> >> >> On Monday, February 11, 2013 3:50:36 PM UTC-7, [email protected] wrote: >> >>> Not really. Double pitch means that each link is twice the pitch of a >>> single 60 pitch. That means the physical link ends up being as long as (2) >>> normal 60 pitch links. It is large, heavy duty chain. Way overkill for >>> our purpose, but it suits it well because the chain is so stiff that it has >>> no choice but to stay on the sprockets. It also has very deep links for >>> the sprockets to mate with. >>> >>> Derek >>> >>> On Mon, Feb 11, 2013 at 12:22 PM, Jacob <[email protected]> wrote: >>> >>>> Double pitch meaning that it grabs every other chain link? It wont hurt >>>> on a 60 size chain? This chain style is becoming a harder idea to chew as >>>> I can not find any that are reasonablly priced. >>>> >>>> >>>> On Sunday, February 10, 2013 6:05:35 PM UTC-7, [email protected] wrote: >>>> >>>>> Holy crap Robert...and I though spending $150 on my carbon steel >>>>> tracks for the KV-2 was expensive. :) >>>>> >>>>> The cheap 2060 chain that Will was selling has dried up. 60P >>>>> sprockets can be used with 2060 chain. I've done it and that's how the >>>>> Sturmtiger is set-up. 2060 is just a double pitch 60 pitch chain. >>>>> >>>>> Derek >>>>> >>>>> On Sun, Feb 10, 2013 at 3:32 PM, Robert Currie <[email protected] >>>>> > wrote: >>>>> >>>>>> Hi >>>>>> I don't know if this will help you but the attachment chain I >>>>>> purchased in 2003 was $515.20 here in Canada another reason it's taking >>>>>> me >>>>>> a little longer to get my grizzly up and running >>>>>> So that was four 7' long lengths of 2060 attachment chain with tab on >>>>>> one side ,and four master links >>>>>> >>>>>> [email protected] >>>>>> >>>>>> >>>>>> -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
