Look Ma- no chain

comnoz · Mar 21, 2011

Yeah you would think I would learn. Notice it is bent a bit. Jim

comnoz · Mar 21, 2011

I've always been a sucker for a set of Ansens.

Jeandr · Mar 21, 2011

Cool looking stuff, why make it in two parts :?:

Jean

Hortons Norton · Mar 21, 2011

I would figure at some point you are going to run out of things to make? Those look awesome Jim, Keep up the great work. And I love that machine.

comnoz · Mar 21, 2011

Jeandr said:
Cool looking stuff, why make it in two parts :?:

Jean

The center hub will hold a common chain sprocket also. I am making a run of the hubs for CNW. MK3 850's only. Plus two smaller pieces of aluminum is cheaper that one big hunk. Jim

comnoz · Mar 21, 2011

Hortons Norton said:
I would figure at some point you are going to run out of things to make? Those look awesome Jim, Keep up the great work. And I love that machine.

I love that machine too. I only wish it came with somebody to sweep up the mess. Jim

Cheesy · Mar 22, 2011

How did you generate the cutter profile for the belt, I thought the Gates ones were propriety? The GT, GT2 etc are different to the more common HTD profiles (although the GT2 belt has been run on HTD sprockets) ... Woops just looked at the Gates site and they now say you can run the GT2 on HTD sprockets.

comnoz · Mar 22, 2011

Cheesy said:
How did you generate the cutter profile for the belt, I thought the Gates ones were propriety? The GT, GT2 etc are different to the more common HTD profiles (although the GT2 belt has been run on HTD sprockets) ... Woops just looked at the Gates site and they now say you can run the GT2 on HTD sprockets.

The belt is a polychain and uses a special sprocket for full capacity. I picked up a cheap polychain sprocket on e-bay and sent it to my tool grinder who drew up the profile in his comparator.

tocino · Mar 22, 2011

comnoz said:
Actually the center is a stock sprocket with the teeth removed with a tool post grinder. Then I pressed a steel ring over it and sweated it in place with brass and trued it up in the lathe . Then I cut the tooth contour with a staight 1/8 inch bit in a CNC mill. Jim

Oh is that all?

I wish I had even the ability to even understand the talent behind this. Looks great.

Gino Rondelli · Mar 22, 2011

Nice job Jim, a Dutch guy beat you to it though, I should have pictures somewhere, perhaps 79x100 will remember the details, I asked him about it and he explained the whole job in detail (for at least an hour) His also had USD KTM (from memory ) forks,
Be great to see how it performs, always thought the chain drive was ONE of the Commando's achilles heels for long distance touring

comnoz · Mar 22, 2011

Gino Rondelli said:
Nice job Jim, a Dutch guy beat you to it though, I should have pictures somewhere, perhaps 79x100 will remember the details, I asked him about it and he explained the whole job in detail (for at least an hour) His also had USD KTM (from memory ) forks,
Be great to see how it performs, always thought the chain drive was ONE of the Commando's achilles heels for long distance touring

No question - I am not the first. I know of a couple Commandos running around with belts. I have wanted to do it for a long time but couldn't get just what I wanted to make it my way. Jim

Tim_S · Mar 22, 2011

OK Jimmy ,,,,,,,,,I'll bite,,,,,, How much?

Tim_S

comnoz · Mar 22, 2011

Tim_S said:
OK Jimmy ,,,,,,,,,I'll bite,,,,,, How much?

Tim_S

Tim,
I am a long way [if ever] from being able to reproduce the belt drive in any quantity, May work it in someday if I see a demand.

The next thing on my list is to complete the jigs to make timing gear sets with enough accuracy to call good. I have installed a new micro-positioning axis on my mill but I am still working on the jigs to make multiple gear sets without having to babysit the machine.

The hubs will be available soon but a price has not been set. Jim

domiracer66 · Mar 22, 2011

Cool beans Jim, have you considered cutting the tooth form with an EDM? It's not uncommon to find fast EDMs these days with 20+ inches of Z-axis. Theoretically you could cut the tooth profile in a 20" length then O.D. clamp the work piece on the pitch line, bore, face, cut off, repeat, until you have a stack of sprockets. If you could find a local job shop that has a lathe with live tooling capability you could do the off center work in the same op. I know you're just in the prototype stage but if you're considering production it might keep the costs down for those of us who might be... ahem.. "less fortunate"
Kris

comnoz · Mar 22, 2011

domiracer66 said:
Cool beans Jim, have you considered cutting the tooth form with an EDM? It's not uncommon to find fast EDMs with 20+ inches of Z-axis these days. Theoretically you could cut the tooth profile in a 20" length then O.D. clamp the work piece on the pitch line, bore, face, cut off, repeat, until you have a stack of sprockets. I know you're just in the prototype stage but if you're considering production it might keep the costs down for those of us who might be... ahem.. "less fortunate"
Kris

Yes I have considered EDM but I am not sure that it could be done more economically than milling. I can mill up to about 24 inches in my setup which is how I would go about doing multiples. I am working on a large bandsaw to fit on my lathe to part them. I just hate to farm out work anymore. It seems every time I have done that in the past I have ended up with a lot of headaches. I have also had some bids to produce the parts in China but that just doesn't sit right with me. Jim

rond944 · Mar 23, 2011

Jim , so do I understand this correctly ? These CNW Mk3 hubs will allow one to use readily available standard motorcycle sprockets that just bolt on to the hub/carrier ? That would provide alot of reasonably priced options for fine tuning the final drive ratio and eliminate the need to remove the primary to effect a gearing change . I WANT ONE :mrgreen:

Ron

comnoz · Mar 23, 2011

rond944 said:
Jim , so do I understand this correctly ? These CNW Mk3 hubs will allow one to use readily available standard motorcycle sprockets that just bolt on to the hub/carrier ? That would provide alot of reasonably priced options for fine tuning the final drive ratio and eliminate the need to remove the primary to effect a gearing change . I WANT ONE :mrgreen:

Ron

That is correct. Sprockets are readily available from 38 to 50 or so. 520 chain. Jim

rond944 · Mar 23, 2011

OK thanks ! That's great news since I was about ready to buy a CNW 520 chain conversion anyway .

Ron

comnoz · Mar 23, 2011

Here is the hub with the sprocket that fits.

And here's to Hobot

Hortons Norton · Mar 23, 2011

Sexy VERY Sexy!!!!!

Look Ma- no chain

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