etard
100 kW
Ok, price quote for 160 tooth, $45/ piece, or $39 if we get at least 24 pieces. Does that sound reasonable? Or keep looking?
Direct Drive #219 Pitch Monster Sprocket
- Thread starter etard
- Start date
Sounds good to me etard, reasonable for a custom part imo.
160t is close enough for me i imagine, 165t is a perfect 15-1 with a 11t driver but im flexible if others want something different.
let me know how you get on, good work man!!!
D
160t is close enough for me i imagine, 165t is a perfect 15-1 with a 11t driver but im flexible if others want something different.
let me know how you get on, good work man!!!
D
K-ray
1 W
Ya that price is.... Surprisingly reasonable 
I'll support the cause. Count me in for one.
I'd suggest as many lightening holes as possible...
It's gonna be a beast :lol:
Very cool etard
I'll support the cause. Count me in for one.
I'd suggest as many lightening holes as possible...
It's gonna be a beast :lol:
Very cool etard
liveforphysics
100 TW
When they lighten it, ask for an offset radial spoke pattern.
This pattern, only on a sprocket rather than a brake rotor.
If they are just going to do the lightening on a CNC, it doesn't really make a difference in the amount of work to do an optimized lightening pattern vs something unoptimized. This does mean the sprocket is only strong being loaded in one direction, but I don't think anyone is trying to regen RC motors, and most of us will want it mounted on a freewheel, so it shouldn't matter.
This pattern, only on a sprocket rather than a brake rotor.
If they are just going to do the lightening on a CNC, it doesn't really make a difference in the amount of work to do an optimized lightening pattern vs something unoptimized. This does mean the sprocket is only strong being loaded in one direction, but I don't think anyone is trying to regen RC motors, and most of us will want it mounted on a freewheel, so it shouldn't matter.
mwkeefer
1 MW
etard,
Count me in for 2 of the 160t #219 in lightened aluminum...
Gary's bolt pattern or just a ISO 40mm 6 bolt pattern (brake standard) would be perfect...
Any suggestions or ideas on where I could source a 10t #219 8mm id drive sprocket?
-Mike
PS: What's the count at... maybe I can make up the difference to get this ball rolling.
Count me in for 2 of the 160t #219 in lightened aluminum...
Gary's bolt pattern or just a ISO 40mm 6 bolt pattern (brake standard) would be perfect...
Any suggestions or ideas on where I could source a 10t #219 8mm id drive sprocket?
-Mike
PS: What's the count at... maybe I can make up the difference to get this ball rolling.
John in CR
100 TW
Yes, 2 for me also. Also, an odd tooth count for even chain and tooth wear. How heavy is 219 chain? I'm interested in one of the sprockets for use as a chainring for leisurely pedaling at 40mph.
John
John
liveforphysics
100 TW
John in CR said:
It is between 0.2-0.23lbs/ft.
John in CR
100 TW
liveforphysics said:
I mean is it big heavy looking motorcycle chain? I guess that wouldn't really matter anyway and would look cool with the right build and the same type chain for the motor too.
liveforphysics
100 TW
Nope, it's dainty looking. From the side it looks about identical to bicycle chain, except the pins are closer together. When you look down from the top, you notice it's about twice as wide, and the edge plates are maybe 4x thicker than bicycle chain.
mwkeefer
1 MW
It's the same chain as goped esr 750 uses... goped is 13t to 76t (stock) #219.
I have to agree with an odd number of teeth to reduce noise +- 1 shouldn't be a big deal.
What is the outter diameter of these... I would be using on a 20" folding electric rear... prob you already posted this info and I'm just lazy.
-Mike
I have to agree with an odd number of teeth to reduce noise +- 1 shouldn't be a big deal.
What is the outter diameter of these... I would be using on a 20" folding electric rear... prob you already posted this info and I'm just lazy.
-Mike
Thud
1 MW
Mwkeefer,
The pitch dia for a 160t 219=15.58"
(I think too large for a 20" bike rim)
K-ray-To aneal,I heated the lil bugger in a small forge & let it cool as slowly as I could (still a bugger to bore but better than the glass hard condition I bought it in) Only the teeth need to be re-hardend. I just used the accetelyn tourch & quenched as you guessed in oil.
zero time on it (still short some chain) so I have no clue as to durabitlty yet.
The pitch dia for a 160t 219=15.58"
(I think too large for a 20" bike rim)
K-ray-To aneal,I heated the lil bugger in a small forge & let it cool as slowly as I could (still a bugger to bore but better than the glass hard condition I bought it in) Only the teeth need to be re-hardend. I just used the accetelyn tourch & quenched as you guessed in oil.
zero time on it (still short some chain) so I have no clue as to durabitlty yet.
liveforphysics
100 TW
torqueon said:
It's a chain that was designed for the sport of Kart racing. It is optimized for use at very high speeds around very small diameter sprockets. This is because a Kart's rear sprocket size is limited by the size of the rear tires (which are small), so the finer pitch chain they can run, the better they are able to make use of high RPM engines (like 19,000rpm) through gearing.
#219 chain is light, and yet strong enough handle the abuse of a 55hp racing kart with fantastic reliability (if the sprockets are good and mounts are rigid of course!).
this is #219 chain next to bicycle for comparison.
i think the mounting holes will be different for everyone depending on what your doing with it, personally i need to be able to mount it to a 22t eno but if this varies for all maybe we need a agreeable medium leaving us all to make an adapter to suit, not very expensive and can be done at any local engineering place for little cost?
D
i think the mounting holes will be different for everyone depending on what your doing with it, personally i need to be able to mount it to a 22t eno but if this varies for all maybe we need a agreeable medium leaving us all to make an adapter to suit, not very expensive and can be done at any local engineering place for little cost?
D
K-ray
1 W
Thud wrote
"Only the teeth need to be re-hardend. I just used the accetelyn tourch & quenched as you guessed in oil"
Thanks Todd, I'm gonna give it a go soon
As you know there is a serious lack of user friendly counter sprockets.
I do think if you tool up and build em, you wont have trouble finding excited buyers.
It seems 3/8" and 1/2" as well as metric bores are all desired... maybe various bushings
available for one large bore??
Kevin
"Only the teeth need to be re-hardend. I just used the accetelyn tourch & quenched as you guessed in oil"
Thanks Todd, I'm gonna give it a go soon
As you know there is a serious lack of user friendly counter sprockets.
I do think if you tool up and build em, you wont have trouble finding excited buyers.
It seems 3/8" and 1/2" as well as metric bores are all desired... maybe various bushings
available for one large bore??
Kevin
mud2005
10 kW
what is it about an odd number of teeth that makes it quieter than an even number?
John in CR
100 TW
mud2005 said:
Not sure unless they get noisier over time with uneven wear. I definitely want an odd number, especially since it's aluminum. That way wear has to be even, because it's not the same links hitting the same teeth on the sprocket each go round. I picked that tidbit up from the Sheldon Brown website in the discussions dedicated to single speed bikes. If if makes a difference on a pedal bike, then the issue has to be magnitudes bigger at the powers I run.
John
vanilla ice
1 MW
OT.. If you use both even T sprocks front and rear and have a chain with an even number of teeth (no half links). Each tooth will only engage an inner link or outer link, not both types of link. Since stretch amount differs from inner to outer link, the teeth wear in to "match" their respective spots in the chain better. So the set should be slightly quieter and last a bit longer than a not all even set.
The fixie guys worry about number of flat spots on their tires, so a 15/45 setup is a no-no, where as a 16/47 is ok. I'd think the freewheelin single speeders would see the all even setup as a plus if anything.. I mean it is, unless you pull the chain off and put it back on wrong (mark it).
http://www.sheldonbrown.com/chain-life.html
The fixie guys worry about number of flat spots on their tires, so a 15/45 setup is a no-no, where as a 16/47 is ok. I'd think the freewheelin single speeders would see the all even setup as a plus if anything.. I mean it is, unless you pull the chain off and put it back on wrong (mark it).
http://www.sheldonbrown.com/chain-life.html
thanks for the explanation Vanilla
right guys onto the main issue..........
what are we going to do as a standard for the mounting of this monster????
etard will need to instruct his guy for the group buy and we cant all have mass variation.
D
right guys onto the main issue..........
what are we going to do as a standard for the mounting of this monster????
etard will need to instruct his guy for the group buy and we cant all have mass variation.
D
etard
100 kW
Ok guys, I'm not seeing this happen at the current order level, so far I'm counting only about 6-8. I'm wondering if this is a dead end and nobody is interested, or the size is off, or we should just hold out for a composite sprocket to show up. I also am itching to make my own, the way Luke says, in four sections. Shouldn't be too difficult to drill out the holes in four sandwhiched pieces and mount it to gary's adapter. I'm thinkng even with possible misaligned holes from crude tools and probable user error the whole will be round and teeth too numerous to feel the effect of a few stragglers. Somebody correct me if I am wrong, will 10 teeth 1/2mm off center effect the balance on a sprocket with 269 teeth??
mwkeefer
1 MW
Seriously how many do we need to order and what's the count... I can take a few probably and I know others will support this. I'm still waiting for THE BIGGEST HONKING 219 I can fit onto a 20" rear = )_
For simplicity sake - lets just go with the disc brake mount (6 hole 40mm iso)... there are tons of adapter and it will be easy to make it work with gary's adapters (in fact, why not be a rocket scientist and drill both sets so a total of 10 bolt holes).. ID of center should allow SA3 mounting / passthrough without hole saw!
I think it can be done, i have one of gary's adapters and a few thread on 40mm 6 bolt ISO adapters so... want me to overlay scan them?
-Mike
For simplicity sake - lets just go with the disc brake mount (6 hole 40mm iso)... there are tons of adapter and it will be easy to make it work with gary's adapters (in fact, why not be a rocket scientist and drill both sets so a total of 10 bolt holes).. ID of center should allow SA3 mounting / passthrough without hole saw!
I think it can be done, i have one of gary's adapters and a few thread on 40mm 6 bolt ISO adapters so... want me to overlay scan them?
-Mike
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