recumpence
1 GW
Hmm, a #25 chain will tolerate more power than we mere mortals would normally throw at it. 
Matt
Matt
Belt drive Sprockets on the Cheap!
- Thread starter katou
- Start date
boostjuice
10 kW
Another option I stumbled across. Not sure if they've been spotted before. Certainly light-weight.
8M profile. Available up to 90T (US$50 for 25mm width option) >> http://www.cometkartsales.com/store/belts/8sprockets.htm
The 90T option has a 229.18mm Outside Pitch Diameter (includes belt thickness), to find other dimensions see here >> http://www.chc-transmission.com.tw/p141.htm
Being designed to bolt directly to a Go-Kart hub, they should work with one of these adaptors for a direct bolt-on to 44mm ISO disk brake mount bicycle hubs. >> http://kingssalesandservice.com/top-hat-sprocket-adaptor/ EDIT: would have to check BCD and hole count with Comet to be sure
_______________________________________________________________________________
Also, 8M driving pulleys are available down to 14T! well below the smallest readily available size (22T) as well as below the minimum tooth count recommended for 8M (18T), however Miles is having no problems with 16T.
http://www.cometkartsales.com/store/belts/8drivers.htm
_______________________________________________________________________________
8M RPM vs PWR performance chart
8M profile. Available up to 90T (US$50 for 25mm width option) >> http://www.cometkartsales.com/store/belts/8sprockets.htm
The 90T option has a 229.18mm Outside Pitch Diameter (includes belt thickness), to find other dimensions see here >> http://www.chc-transmission.com.tw/p141.htm
Being designed to bolt directly to a Go-Kart hub, they should work with one of these adaptors for a direct bolt-on to 44mm ISO disk brake mount bicycle hubs. >> http://kingssalesandservice.com/top-hat-sprocket-adaptor/ EDIT: would have to check BCD and hole count with Comet to be sure
_______________________________________________________________________________
Also, 8M driving pulleys are available down to 14T! well below the smallest readily available size (22T) as well as below the minimum tooth count recommended for 8M (18T), however Miles is having no problems with 16T.
http://www.cometkartsales.com/store/belts/8drivers.htm
_______________________________________________________________________________
8M RPM vs PWR performance chart
boostjuice
10 kW
Nice job Miles! Any chance of a DXF version? pretty please
boostjuice
10 kW
We might even be able to order the Pulley's from Pfeifer Industries direct, Maybe even from premade casts of multiple BCDs, or if we pooled a group buy together we could even get them with 44mm ISO BCD straight up with a custom design.
From their catalogue page V V V
From their catalogue page V V V
boostjuice
10 kW
Good point, more versatility is a strong virtue. I'll contact Comet about the BCD/s on their range of pulley halves.
Thud
1 MW
Miles,
I am really confident that the BCD on the split kart sprockets are 5.25"
I just don't know what the offsets need to be for the top hat adapter....I could cast those way less expensivly than machining from a billet......not as pretty but I am a confirmed cheapo.
other than my ignorance, it looks good from here.
I am really confident that the BCD on the split kart sprockets are 5.25"
I just don't know what the offsets need to be for the top hat adapter....I could cast those way less expensivly than machining from a billet......not as pretty but I am a confirmed cheapo.
other than my ignorance, it looks good from here.
That's what I was wondering, too... Together with the offset mount on the pulleys themselves, this design gives the possibility of four different offsets. So, the question is. What is the maximum offset that might be needed?Thud said:
Good idea to cast them. They'd only need minimal machining, then.
Thud
1 MW
Hows it looking on the FEA simulation? :lol:
Lot of meat around the 44mm BC yet..& what do you need so many holes for.....you want Huge windows in there LOL..you can get it to 85grams Miles....go Miles Go!
Lot of meat around the 44mm BC yet..& what do you need so many holes for.....you want Huge windows in there LOL..you can get it to 85grams Miles....go Miles Go!
Thud
1 MW
check your inbox Miles...curious what that one weighs.... :lol:
I estimate around 50grams....that ought to be frail enough...
I estimate around 50grams....that ought to be frail enough...
boostjuice
10 kW
Ok, so I contacted Pfeifer and Comet. Have only heard back from Pfeifer so far.
So its confirmed. Bore configuration is for standard go-kart sprocket carrier (4-9/16" register with 6 bolt hole
pattern on a 5-1/4" bolt hole circle). Standard profile is HTD, but they do PolyChain GT on request. At the moment it is unconfirmed what profile Comet sells, but I would think HTD is most likely.
PfeiferInd_8mm_HTD_25mm_5.25inchBCD_Go-Kart_belt_pulleys.pdf
Pfeifer also do a 49>70T version with a 3" register with 6 bolt hole pattern on a 3-5/8" bolt hole circle.
PfeiferInd_8mm_HTD_25mm_3.625inchBCD_Go-Kart_belt_pulleys.pdf
Product datasheets for 40mm wide options here (likely too wide for our use):
PfieferInd_8mm_HTD_40mm_5.25inchBCD_Go-Kart_belt_pulleys.pdf
PfieferInd_8mm_HTD_40mm_3.625inchBCD_Go-Kart_belt_pulleys.pdf
I also asked Pfeifer some other questions:
Are you willing/able to sell the same pulleys factory direct for a lower price?
[Jim Donovan Jr.] Yes, however to be set up for a OEM or Dealer you need to purchase over a $1,000 USD. What is your application?
Do you offer similar pulleys with tooth counts >90T in 8M?
[Jim Donovan Jr.] Yes, this also depends on what belt width you are planning on using. What are the number of teeth you are looking for? I have attached some product sheets for your use. You have indicated the pitch that you want is (8mm), what tooth profile are you planning on using HTD, PolyChain GT, PowerGrip GT2, etc?
Do you offer the same fundamental design as sold by CometKartSales, but with differing non-custom BCD's for mounting bolts?
[Jim Donovan Jr.] Yes, we can do that and we have some available already. Please let me know what you are looking for.
So its confirmed. Bore configuration is for standard go-kart sprocket carrier (4-9/16" register with 6 bolt hole
pattern on a 5-1/4" bolt hole circle). Standard profile is HTD, but they do PolyChain GT on request. At the moment it is unconfirmed what profile Comet sells, but I would think HTD is most likely.
PfeiferInd_8mm_HTD_25mm_5.25inchBCD_Go-Kart_belt_pulleys.pdf
Pfeifer also do a 49>70T version with a 3" register with 6 bolt hole pattern on a 3-5/8" bolt hole circle.
PfeiferInd_8mm_HTD_25mm_3.625inchBCD_Go-Kart_belt_pulleys.pdf
Product datasheets for 40mm wide options here (likely too wide for our use):
PfieferInd_8mm_HTD_40mm_5.25inchBCD_Go-Kart_belt_pulleys.pdf
PfieferInd_8mm_HTD_40mm_3.625inchBCD_Go-Kart_belt_pulleys.pdf
I also asked Pfeifer some other questions:
Are you willing/able to sell the same pulleys factory direct for a lower price?
[Jim Donovan Jr.] Yes, however to be set up for a OEM or Dealer you need to purchase over a $1,000 USD. What is your application?
Do you offer similar pulleys with tooth counts >90T in 8M?
[Jim Donovan Jr.] Yes, this also depends on what belt width you are planning on using. What are the number of teeth you are looking for? I have attached some product sheets for your use. You have indicated the pitch that you want is (8mm), what tooth profile are you planning on using HTD, PolyChain GT, PowerGrip GT2, etc?
Do you offer the same fundamental design as sold by CometKartSales, but with differing non-custom BCD's for mounting bolts?
[Jim Donovan Jr.] Yes, we can do that and we have some available already. Please let me know what you are looking for.
etard
100 kW
I love the sprocket threads! If anybody has them all organized, it would be great to compile them all together in the resources sticky.
On the subject of that King Top Hat Adapter, they use thier own damn proprietary BCD so you have to buy thier sprockets as well, there definately is a market for the disc brake to 5.25" go cart sprocket adapter if anybody wants to machine a few, I for one will buy a couple.
I have been hoarding a 90 some tooth 8mm pitch sprocket that is 30-40 mm wide hoping to use it for a motorcycle conversion some day. Pfiefer made it, I think it was built for Supercarts but it still has the 5.25" BCD.
On the subject of that King Top Hat Adapter, they use thier own damn proprietary BCD so you have to buy thier sprockets as well, there definately is a market for the disc brake to 5.25" go cart sprocket adapter if anybody wants to machine a few, I for one will buy a couple.
I have been hoarding a 90 some tooth 8mm pitch sprocket that is 30-40 mm wide hoping to use it for a motorcycle conversion some day. Pfiefer made it, I think it was built for Supercarts but it still has the 5.25" BCD.
Similar threads
