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Chain drives
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timmeh
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Joined: 20 Jul 2004
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what % of your motors power do timimg belts transfer?
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Post Tue Sep 21, 2004 7:47 pm 
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mytqik



Joined: 26 Jun 2004
Posts: 127


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Around 95-98% of you motor torque depending on tooth size, pulley weight, rotational velocity etc.

Just a tip, if you are going to buy timing belts from a power transmission company, buy the metric version instead of the imperial. The metric version has deeper teeth & can transmit more torque for a given width when compared to the imperial version.

Post Tue Sep 21, 2004 7:59 pm 
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timmeh
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great!
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Post Tue Sep 21, 2004 8:02 pm 
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timmeh
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Home made belt

I have some rubber tube i am trying to make into a belt.

I have tryed to put rubber glue into both ends of the tube and then a peace of rubber solid tube the size of the hole in the big rubber tube im trying to connect then let it dry over night but it dosent hold at all.

Dose anyone know of any way i can join rubber tube together to make a solid belt?

Or any way of makeing a stretchie belt that keeps tension if the pullys move or so i dont have to have stupid tensioners in my bot?
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Post Mon Oct 25, 2004 5:59 pm 
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Glen
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ive tried attaching belt end to end numerous times on cobras tread. totally unsuccessful.

ive used sikaflex, silastic, contact adhesive and araldite as well as 5 minute epoxy.

i found epoxy to be the best.

try www.teammadcow.com and have a look at how jr. made the one for mad cows revenge.
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Post Mon Oct 25, 2004 6:06 pm 
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Nexus
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Joined: 17 Jun 2004
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Hvae tried something similar when making tracks for T34 and retreads for Pinscher. What I generally do apart from glue is sew the rubber together. I know ity sounds wooosy to sew but it does ad strength when used witha glue as well. Also I cut the rubber ends on angles to give me a bigger surface area to glue onto.
Have done this with timimg belts as well using pins and glue.
So my advice is dont just use glue, use the glue to hold something else on the belt.
Am about to so something similar witha set of wheels. Have rubber strips that need to be joined to make a wheel so will be sewing the rubber with wire from a coat hanger and then glueing the ends and probably bolting it as well.
Glue on its on can suck but when used with something else it can work a treat
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Post Mon Oct 25, 2004 6:33 pm 
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Glen
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question on belts -

is there a minimum diameter of belt i should be using, i only want a 1:1 transmission, but is it unreasonable to have like two 15mm diameter pulleys etc?
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Post Tue Mar 01, 2005 7:20 pm 
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Valen
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Joined: 07 Jul 2004
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smallest we run is 30mm i think
might be 25
and we have fairly thing belts
at 24V the belts get quite hot/warm too
(not as hot as the tyres when ripping it up on the road w00tage)
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Post Tue Mar 01, 2005 7:35 pm 
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Knightrous
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Joined: 15 Jun 2004
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Location: NSW


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Well a bigger pully doesn't flex the belt as much as a smaller pully and gives you a lot more surface area for gripping and transmitting your torque from the power source. I think 40mm Aluminium pullies would be a suitable size IMHO.

Also, V-Belts are much stronger then flat or toothed belts.
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Post Wed Mar 02, 2005 3:54 pm 
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Valen
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at this size you might want to look at multi rib v belts
smaller v's but many of them
the belt stretches and compresses less going roung the pully then
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Post Wed Mar 02, 2005 3:58 pm 
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assassin



Joined: 27 Jun 2004
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Does anyone know how good round belts would be for a drive transmission. Do you think they would slip to easy? Or not?

Post Sat Feb 04, 2006 11:29 pm 
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assassin



Joined: 27 Jun 2004
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*bump*
Question above!

sorry i'm just keen to start building

Post Sun Feb 05, 2006 6:51 pm 
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Glen
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ive seen round belts used for spinning weapon drives and drive belts on smaller beetleweights, not sure i would use them for featherweight drives.

plan g, plan f and plan b used multi ribbed flat belts
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Post Sun Feb 05, 2006 6:52 pm 
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dyrodium
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A little too complex for your first bot unless your experienced using them... Confused
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Post Sun Feb 05, 2006 7:05 pm 
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Glen
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question, on the axe bot the chains are way way to long and even after making a tensioner for it im still not happy. id much rather the chain just be shorter with a simpler tensioner...

can i make the scooter chains shorter when they have no master link?
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Post Sat Aug 12, 2006 3:37 pm 
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