Chris
From: B9Builders@yahoogroups.com on behalf of 'Bob Greiner laptop' bobchrisandbuddy@verizon.net [B9Builders]
Sent: Saturday, January 23, 2016 11:40 AM
To: B9Builders@yahoogroups.com
Subject: Re: [B9Builders] home made treads and wheels I have a couple old videos of Jim W s mobile treadsection and how he had it setup that he posted several years ago. He used timing type belts which work great but like my tire belts don t have the B9 look, although they re not objectionable to me and they do resolve that issue of how a cogged belt should operate around a sprocket. I believe Jim also built stainless steel radar section at one time too which I probably have pics of too. He did some excellent work with the B9!! Bob G. B9-0017 From: B9Builders@yahoogroups.com Sent: Saturday, January 23, 2016 9:59 AM To: B9Builders@yahoogroups.com Subject: Re: [B9Builders] home made treads and wheels The guy I know is Jim W. over in Sussex WI. He's a very busy guy that I only met once a few years ago when I started building my B9. A friend took me over to his house to see his various collections, B9 and other robots. Wow! what a collection this guy has! I was in heaven all evening. Anyway, He's a follow B9 Builders Club member (B9-0033) but has drifted away towards other interests and paths. His awesome motorized B9 is very close to being finished and he told me that evening that we really wanted to get back to work on his B9 to finish it someday. I've lost track of him sense and don't know what he's done to his B9, if anything. I do know a little something about Kevlar and based on what I read. I was doing research on what type of synthetic cable to use on my B9 Arm retraction platform and my first thought was Kevlar cable. I found some siprising things about it and decided not to use it. I don't know if it would be the right material to use in tread belts. However I could be wrong. Seems that Kevlar tends to fatigue, creep and fail. Here's just a little peace of info I found on this issue:
Anyway, a better fiber to use would be Vectran. It's amazing stuff and I ended using it in my arm retraction platform. Here's the info on it: Vectran is a high-performance multifilament yarn spun from liquid crystal polymer (LCP). Vectran is the only commercially available melt spun LCP fiber in the world. Vectran fiber exhibits exceptional strength and rigidity. Pound for pound Vectran fiber is five times stronger than steel and ten times stronger than aluminum. These unique properties characterize Vectran : High strength and modulus Excellent creep resistance High abrasion resistance Excellent flex/fold characteristics Minimal moisture absorption Excellent chemical resistance Low coefficient of thermal expansion (CTE) High dielectric strength Outstanding cut resistance Excellent property retention at high/low temperatures Outstanding vibration damping characteristics High impact resistance I found all sorts of cable made with Vectran. I ended up using 3/32" "Shine Line". It a synthetic cable with a covered Vectran fiber core. It's as flexible as string and I have a lot of trouble trying to cut it with wire cutters. However a sharp knife or edge will slowly sever it but you cant pull it apart even when it gets down to only a few strands holding. I have it wound tightly on a pulley and it's pulled my heavy B9 arm in and out of the torso hundreds of times with no stretch at all. I'm blown away by this stuff. Here is the cable I used that I bought on Amazon: Shine LineThe tensile, creep and tension-tension fatigue properties of Kevlar-49 fibre (formerly known as PRD-49) have been determined. The fracture morphology of the fibre has been examined and is shown to be complex due to considerable splitting. The fibre quickly stabilizes under a steady load but failure due to creep can occur when it is loaded very near to its simple tensile breaking load. Kevlar-49 has been found to fail by fatigue, and its fatigue lifetime is dependent on the amplitude of the applied oscillatory load as well as the maximum load to which the fibre is cycled.
Anyway, as far as adding reinforcement to out B9 tread belts; there may not be a lot of difference between using Kevlar and Vectran. The load put on the belts may be within Kevlar's tolerances. However if given a choice I'd use Vectran. Hope this helps, Dave Schulpius On Sat, Jan 23, 2016 at 9:05 AM, toblueiis toblueiis@yahoo.com [B9Builders] wrote:
Hello Dave,
That sounds interesting about the guy making his belts out of Harley fan belts. Today with kevlar reinforced belts, that would make a nice, non stretchable belt. I was just looking at some bike tires with kevlar at the store, sold in a box. I was thinking that it would be nice if they could be used in making poured belts, where this portion of the tire was embedded in the pour for strength. Was wondering how well they would bond together.
Do you have any more info on the Harley guy's belts? Maybe he will see this thread and chime in.
thanks,
David M.
--------------------------------------------
On Sat, 1/23/16, David Schulpius dschulpius@wi.rr.com [B9Builders] wrote:
Subject: Re: [B9Builders] home made treads and wheels
To: "Tobor001@aol.com [B9Builders]"
Date: Saturday, January 23, 2016, 8:55 AM
Hi Chris,
Are you going to be making your
robot mobile or static? Before I start I need to say I have
a static B9 and don't have plans to have him roaming
around the house or yard. I did however get good set of
machined wheels from a club vendor but opted for a set of
low cost but high quality treads that are not looped. I just
clamped them together where it cant be seen. Also I used
shoulder bolts and sleeves instead of bearings and
axles.
Check the Vendors area over on our
web site for some good choices on available tread section.
We have three that offer excellent treads. Barton and Huber
offer the non-continuous that need to be clamped and
Reinbrecht offers the continuous belt. Several others do the
wheels but usually only do runs when enough people want
them. They are Barton, Sockwell and Considine. Their
wheels are expensive but worth every penny and oh so cool.
Here's a link to the vendor list:
http://www.b9robotbuildersclub.com/pub/builders/scrapbooks.html
If you don't plan to motorize
the treads and are on a budget you don't have to make
the wheels and tread tank tread quality and save some money.
Make these part yourself and save. Look through the members
web sites and scrapbooks listed over on our website. There
are several people that show how they made their own wheels
and treads that are listed with links. I know a guy that
works at Harley Davidson that made his treads out of Harley
fan belts. They looked great and are very strong. I know
other builders that made the wheels out of wood. I've
seen others make them out of pvc plastic discs and pipe.
Still others went to a machine shop and had nice aluminum
ones made for them. There are some real nice Blueprints for
the wheels and tread belts on our website here:
http://www.b9robotbuildersclub.com/tools/protected/reference/blueprints.html
Take some time and research what
others have done. Our links to other members builds is a
good way to get ideas and tips:
http://www.b9robotbuildersclub.com/pub/builders/membersites.html
http://www.b9robotbuildersclub.com/pub/builders/scrapbooks.html
It's your robot and wallet. You
can go any way your money, talent and imagination leads
you.
Just have fun, Dave Schulpius
On Fri, Jan 22, 2016 at
11:15 PM, christopher_balke@yahoo.com
[B9Builders]
wrote:
Hey anyone make their own wheels and treads that
work ?
Chris
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