Dave's 80:1 RC mid drive kit build log

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Clyon2   1 mW

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Re: Dave's 80:1 RC mid drive kit build log

Post by Clyon2 » Sep 09 2018 9:46am

I also had difficulty with my disassemble and lube task. I was able to remove the first assembly plate. I did find some evidence of glue (though I wondered if it was some other heat related goop). I cleaned it off before reassembling. The issue of realigning the wheels before reinserting the pins was another challenge. The back plate was installed with the punch marks on the freewheel side. Couldn't see them. With a crochet hook I could feel them and reassembly proceeded. Runs like a top.

If it is glued and mere mortals are not supposed to disassemble, that will make thorough removal of old grease an issue. The maintenance bulletins need to be brought into line with current reality.

I am delighted with the power. If I thought the controller and mechanics could take it, I would crank it up. With the potential for 150A for brief bursts, I have it capped at 100. Three chainrings in one wkend was enough. That seems to have settled with a steel driven narrow chainring, and precise chainline adjustment. The stock tensioner is just fine. I still have chain skip at extremes of the rear cluster. The Alfine 8 would settle that chainline issue if indeed they prove to tolerate the abuse. Temp is rarely over 100C, though some trails push it up. Ensuring low enough gears is good for temp control.

The wife (who steals it on occasion) has 2 switched settings at 15 and 20%. of max. It gives a boost for the Bob trailer and 80 lbs groceries. A true electrically assisted bike!

What fun!

Ham   100 W

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Re: Dave's 80:1 RC mid drive kit build log

Post by Ham » Sep 09 2018 10:53am

Alfine 8 holding fine so far...800 miles or so with the 3220
http://www.HamsFitness.com Strength, Conditioning & Diet

totolito   10 mW

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Re: Dave's 80:1 RC mid drive kit build log

Post by totolito » Sep 09 2018 11:29am

Hello!
No problem for me, I changed the grease this week-end...

Ham   100 W

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Re: Dave's 80:1 RC mid drive kit build log

Post by Ham » Sep 09 2018 11:47am

The transplant. Modified to fit. Finished the chain tug today. Just a few tidying bits left to go. Tangent kit is versatile as hell.
2018-09-09 17.42.42.jpg
Still need to sort cable ties and key cover and eventually a wider rear rim and of course a much better battery to truly unleash this beastie...maybe some graphics etc. Functionally sorted. ....apart from alfine 8 axle nuts...damn stock ones are made of cheese and in a silly thread of 3/8 and 26tpi which i naturally i have none of....on order.
http://www.HamsFitness.com Strength, Conditioning & Diet

Mugenski   1 W

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Location: Toronto

Re: Dave's 80:1 RC mid drive kit build log

Post by Mugenski » Sep 09 2018 11:55am

Thanks all for everyones input. I didn't see any evidence of glue but perhaps it has been stuck together.

That bike looks great Ham! And yes, you either need a lot of 18650s or some lipo pouch cells to make full use of the tangent.

I run a 3 pos switch for a "legal setting" around 2000w with the CA doing the work of soft start and ramps. Works well in all 6 of my gears (18t-40t) and makes the bike rideable by anyone with no worrying on my end. My second profile is for offroad and is pretty much what Dave shipped me my Gen1 kit with, 130A, throttle ramps and all the other CA features. My last profile is "unlimited" which I do still happen to limit to 200A, no throttle ramps just pure Talon control (CA set to pass-thru). To use this mode you need very fine throttle control. Changing some of the settings of the Talon via Castle link would be advised if you want to use this setting regularly. It just wants to wheelie and rip your bike apart. I don't use it apart from showing off to my MTB and motorcycle buddies.

If any Tangent riders ever want to go riding in the Toronto area let me know. Trails or hooligan I am up for either :twisted:
Giant Glory Tangent ∞kw @ 52v

12-C   100 W

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Re: Dave's 80:1 RC mid drive kit build log

Post by 12-C » Sep 16 2018 2:10am

Just posting up my solution regarding some chain skipping/drop issues I had previously.

Solution.

I sourced a very long tooth profile narrow/wide derailleur cog. Put this on a beefy aftermarket tension arm and then threaded a bolt thru the end to limit travel at extreme. This allows for adequate movement of the chain but doesn't allow so much as to allow the chain to drop. Tension is provided by a spring(door stop pulling in tension :lol: honestly I couldn't find a strong enough spring I liked and this seems to be working really well). No dropped chains on my whole ride. No side-side play in the tensioner. Likely will make a custom cnc arm down the road when time allows.
WP_20180907_23_15_34_Pro web.jpg

totolito   10 mW

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Re: Dave's 80:1 RC mid drive kit build log

Post by totolito » Sep 26 2018 7:57am

Hello Guys!

I'm back with a strange behavior of my CA: When I switch on the system, the LCD shows that my throttle is fully twisted. I need to disconnect the throttle and reconnect it back to see the correct value otherwise the system doesn't work.

Another strange thing, sometimes the motor take a time to stop, a bit like if the parameter of ouput throttle "Down Rate" was not to a high value.


What are your thought about this behavior?


Thanks

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Adamlivi   10 mW

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Location: Norcross, Georgia

Re: Dave's 80:1 RC mid drive kit build log

Post by Adamlivi » Sep 26 2018 9:27am

You may want to consider taking out a link... if too short adding a half link would make chain length perfecto. This was my solution.
12-C wrote:
Sep 16 2018 2:10am
Just posting up my solution regarding some chain skipping/drop issues I had previously.

Solution.

I sourced a very long tooth profile narrow/wide derailleur cog. Put this on a beefy aftermarket tension arm and then threaded a bolt thru the end to limit travel at extreme. This allows for adequate movement of the chain but doesn't allow so much as to allow the chain to drop. Tension is provided by a spring(door stop pulling in tension :lol: honestly I couldn't find a strong enough spring I liked and this seems to be working really well). No dropped chains on my whole ride. No side-side play in the tensioner. Likely will make a custom cnc arm down the road when time allows.

WP_20180907_23_15_34_Pro web.jpg

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tangentdave   1 kW

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Re: Dave's 80:1 RC mid drive kit build log

Post by tangentdave » Sep 26 2018 11:25am

Totolito, I bet the 'min input' is too close to the actual voltage output by the throttle when closed. Verify the actual input voltage on the CA's top level menu (long hold left button, scroll right thru top level until SETUP THROT IN, then move the throttle and note the max and min range measured at the CA-- also gently rest the throttle at the closed position and note the value if it's greater than when throttle snapped closed). Then enter the SETUP THROT IN menu with long press right button, scroll to 'min input' and make sure this value is 0.02-0.05V higher than the highest minimum value seen on the setup screen (increase the difference between the 'min input' setpoint and the actual value if you want a dead band at the beginning of the throttle movement).

The CA won't arm the throttle until it sees less than the minimum input value upon startup. It's possible to meet this criteria then later in the ride not have the throttle return to as low a value, which would cause the motor to continue to run when throttle closed.

-dave
GGMT/Tangent 8kW
tangentmotors.com

totolito   10 mW

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Re: Dave's 80:1 RC mid drive kit build log

Post by totolito » Sep 26 2018 11:40am

Wow I'm so stupid ans the CA is really smart :roll:

Thanks a lot for your fast reply !

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tangentdave   1 kW

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Re: Dave's 80:1 RC mid drive kit build log

Post by tangentdave » Sep 26 2018 1:21pm

I setup the CA with almost no dead band in the throttle, but that can mean as the throttle becomes dirty and physically doesn't return as far, this scenario may happen.
GGMT/Tangent 8kW
tangentmotors.com

dtx   100 mW

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Re: Dave's 80:1 RC mid drive kit build log

Post by dtx » Nov 20 2018 11:11am

Hey Dave, i can't find the store anymore. Whats up with that?

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